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Variable gain BiCMOS amplifier

Patent Number: 8111105
Publication Date: 2012-02-07
Inventor: Zhou, Jun

An amplifier circuit comprising: a MOSFET amplifier circuit; a BJT amplifier circuit; a MOSFET switch circuit arranged for switching between the MOSFET amplifier circuit and the BJT amplifier circuit to implement different gain modes of the amplifier ...

Biasing methods and devices for power amplifiers

Patent Number: 8111104
Publication Date: 2012-02-07
Inventors: Calanca, Neil; Ahadian, Joseph F.; Sharma, Vikas; Adamski, Jaroslaw E.

Biasing methods and devices for power amplifiers are described. The described methods and devices use the power amplifier output voltage to generate bias voltages. The bias voltages are obtained using rectifiers and voltage dividers. The described biasing methods and devices can be used with class-E power ...

Amplifier circuit with overshoot suppression

Patent Number: 8111103
Publication Date: 2012-02-07
Inventors: Huang, Ju-Lin; Su, Chia-Wei; Liang, Keko-Chun

An amplifier circuit with overshoot suppress scheme including an input amplifier, an output amplifier, and a diode is provided. A first and a second input ends of the output amplifier are coupled to a differential output pair of the input amplifier. A first end of the diode is coupled to an output end of the output amplifier. A second end of the diode is coupled to the first input end of the output amplifier. When the voltage difference between the output and the input ends of the output ...

Auto gain controllers, and communication terminals having the same

Patent Number: 8111102
Publication Date: 2012-02-07
Inventors: Kim, In Hyuk; Yoon, Chol Su; Choi, Hang Seok

An auto gain controller is provided. The auto gain controller includes a variable gain amplification unit configured to receive differential input signals, adjust an amplification gain based on an auto gain control voltage and output differential output signals. The auto gain controller also includes a peak detector configured to detect at least one peak value among the amplified differential output signals, a comparator configured to compare the at least one detected peak value with a ...

Time-alignment of two signals used for digital pre-distortion

Patent Number: 8111101
Publication Date: 2012-02-07
Inventors: Brown, Philip; Ibison, John; Segar, Jeremy; Cooper, Stephen; Friedman, Frank

A digital pre-distortion system which can provide the flexibility to model the highly non-linear distortion associated with High Efficiency RF Power Amplifiers while through a novel implementation of a least squares estimation process allows an implementation well suited for an FPGA application where limited resources and in particular memory resources are ...

Differential amplifier with improved zero-point calibration

Patent Number: 8111100
Publication Date: 2012-02-07
Inventor: Pease, Robert Allen

The present invention covers novel approaches to the differential amplification of an input signal. Embodiments of the present invention have precise gain, swing to within micro-volts (μV) of ground, and have high CMRR without the need for precision resistors or tuned potentiometers. Embodiments of the present invention are particularly suited for the amplification of an instrumentation signal for delivery to an analog-to-digital converter. Examples of such signals include the product of a ...

Multi-channel audio playback apparatus and method

Patent Number: 8111099
Publication Date: 2012-02-07
Inventors: Wu, Li-Te; Shih, Cheng-Feng

A multi-channel audio playback apparatus including a channel interface, a first switching amplifier and a second switching amplifier is provided. The channel interface is used to receive multi-channel digital data and generate first channel digital data and second channel digital data. The first switching amplifier is used to convert the first channel digital data into a first pulse width modulation (PWM) signal according to a first reference signal with a first frequency. The second ...

Segmented linear FM power amplifier

Patent Number: 8111098
Publication Date: 2012-02-07
Inventors: Ginsburg, Brian P.; Ozgun, Mehmet

Various apparatuses and methods for amplifying an FM signal in a segmented linear power amplifier are disclosed herein. For example, some embodiments provide an apparatus including a signal input, a signal output, and an output driver connected between the signal input and the signal output. The output driver includes a number of driver segments connected in parallel, each having an input connected to the signal input and each having an output. The output driver also includes a number of ...

Device with reconfigurable continuous and discrete time functionality

Patent Number: 8111097
Publication Date: 2012-02-07
Inventors: Thiagarajan, Eashwar; Kutz, Harold; Seguine, Dennis; Rohilla, Gajender; Mar, Monte; Snyder, Warren

A programmable system includes a programmable analog device including an operational amplifier to generate an output voltage based on input voltages at terminals of the operational amplifier. The programmable system also includes a system controller to direct the programmable analog device to reconfigure analog circuitry providing the input voltages to the operational amplifier. The reconfiguration of the analog circuitry allows the programmable analog device to implement discrete-time or ...

Power amplifier with stabilising network

Patent Number: 8106713
Publication Date: 2012-01-31
Inventor: Wilson, Martin Paul

A power amplifier circuit comprising a transistor for receiving a signal to be amplified at an input and for outputting an amplified signal at an output; a modulated power supply connected to the transistor output; and a resistive element connected at the transistor output such that a low impedance is maintained at the transistor output across a range of operational ...

Systems and methods for self-mixing adaptive bias circuit for power amplifier

Patent Number: 8106712
Publication Date: 2012-01-31
Inventors: Lee, Dong Ho; An, Kyu Hwan; Lee, Chang-Ho; Laskar, Joy

Systems and methods for providing a self-mixing adaptive bias circuit that may include a mixer, low-pass filter or a phase shifter, and a bias feeding block. The self-mixing adaptive bias circuit may generate an adaptive bias signal depending on input signal power level. As the input power level goes up, the adaptive bias circuit increases the bias voltage or bias current such that the amplifier will save current consumption at low power operation levels and obtain better linearity at high ...

Stacked pre-driver amplifier

Patent Number: 8106711
Publication Date: 2012-01-31
Inventors: Adamski, Jaroslaw Edward; Sharma, Vikas; Nobbe, Dan William

A stacked pre-driver stage and a power amplifier including the stacked pre-driver stage are described. The stacked pre-driver stage comprises stacked pre-drivers arranged in series between a supply voltage and a reference voltage. Each pre-driver includes a pre-driving amplifier, together with MOS transistors. Each pre-driver is subject, in operation, to a voltage difference which is inferior to a maximum allowed use voltage of the MOS transistors with a largely reduced voltage drop across ...

Apparatus and method for variable gain transconductance

Patent Number: 8106710
Publication Date: 2012-01-31
Inventor: Montalvo, Antonio

The present disclosure describes a variable gain transconductor having gain and/or linearity performance that are selectively controllable in operation. In one embodiment the gain and/or linearity performance are selectively controllable in response to the strength of an input signal, such as an incoming radio frequency (RF) signal to a radio receiver. In one embodiment, gain and/or linearity performance of the variable gain transconductor are selectively controllable by selecting or ...

Pre and post filter automatic gain control with bounded pre-filter gain control

Patent Number: 8106709
Publication Date: 2012-01-31
Inventors: Selby, Steve; Chiu, Fung Ling; Cheng, Gary

An electronic circuit includes a first variable gain amplifier for amplifying a signal at an input to provide a first amplified signal; a filter receiving the first amplified signal to provide a filtered signal; a second variable gain amplifier for receiving and amplifying the filtered signal; a second gain control bock, to provide at least one gain control signal derived from the filtered signal, one of the at least one gain control signal to control the gain of the second variable gain ...

High speed low power multiple standard and supply output driver

Patent Number: 8106708
Publication Date: 2012-01-31
Inventors: Cao, Jun; Momtaz, Afshin; Vasani, Anand Jitendra

A multi-mode driver and method therefore includes a plurality of amplifiers, an adjustable load block, and adjustable current supply circuitry that selectively adjusts current magnitudes supplied to at least one of the plurality of amplifiers. The multi-mode driver can operate in a KR mode with a higher voltage supply, an SR4 mode with the higher voltage supply, and an SFI mode with a lower voltage supply. To support these modes, the multi-mode driver selectively operates a plurality of ...

Controlled-gain wideband feedback low noise amplifier

Patent Number: 8102214
Publication Date: 2012-01-24
Inventors: Lee, Kwang-Chun; Park, Bong-Hyuk

Provided is controlled-gain wideband feedback low-noise amplifier. The controlled-gain wideband feedback low-noise amplifier includes: a feedback amplifier configured to isolate an input signal and an output signal obtained by amplifying the input signal, feed back the output signal to the input signal to amplify wideband input signals, resonate a low-frequency band signal among the wideband input signals to amplify the low-frequency band signal among the wideband input signals, and be ...

Multi-mode low noise amplifier with transformer source degeneration

Patent Number: 8102213
Publication Date: 2012-01-24
Inventors: Deng, Junxiong; Jin, Zhang; Tasic, Aleksandar

A multi-mode low noise amplifier (LNA) with transformer source degeneration is described. In an exemplary design, the multi-mode LNA includes first, second, and third transistors and first and second inductors. The first transistor has its source coupled to the first inductor, amplifies an input signal, and provides a first amplified signal in a first mode. The second transistor has its source coupled to the second inductor, amplifies the input signal, and provides a second amplified signal ...

Signaling system with low-power automatic gain control

Patent Number: 8102212
Publication Date: 2012-01-24
Inventors: Dally, William J.; Poulton, John W.

An integrated circuit receiver includes a first channel comprising an amplifier responsive to a first gain control value in a first mode to receive an input signal and generate a first amplified signal having a transition rate. Detection circuitry in the first channel detects transitions in the first amplified signal in accordance with a detected transition rate. The detected transition rate is based on the first gain control value. Gain control logic adjusts the first gain control value ...

Rail-to-rail input stage circuit with dynamic bias control

Patent Number: 8102211
Publication Date: 2012-01-24
Inventor: Shi, Chunlei

An improved rail-to-rail (R-R) input stage circuit with dynamic bias control is described. Input stage circuit includes a differential pair circuit, a level shifted differential pair and a bias control circuit. The differential pair circuit and the level shifted differential pair are of same type, non-complementary MOS devices. In exemplary embodiments, a first and a second bias control circuits dynamically control the bias current of the level shifted differential pair and the bias current ...

Low phase noise amplifier circuit

Patent Number: 8102210
Publication Date: 2012-01-24
Inventor: Velasquez, Carlos

The amplifier circuit (1) includes a differential pair of PMOS transistors at input (P3, P4), whose source receives a current from a current source (3). The gate of the first transistor (P3) of the pair defines a non-inverting input (X_OUT) and the gate of the second transistor (P4) of the pair defines an inverting input (X_IN). A drain of the first transistor (P3) of the differential pair is connected to a diode connected ...

CMOS variable gain amplifier

Patent Number: 8102209
Publication Date: 2012-01-24
Inventors: Lee, Kwang-Chun; Jang, Seunghyun

A complementary metal-oxide semiconductor (CMOS) variable gain amplifier includes: a cascode amplifier including a common source field effect transistor and a common gate field effect transistor in a cascode structure; a first current generation unit connected in parallel to a drain of the common gate field effect transistor and configured to vary transconductance of the cascode amplifier; a second current generation unit connected to a common source of the cascode amplifier and configured ...

Signal amplifier

Patent Number: 8102208
Publication Date: 2012-01-24
Inventor: Kobayashi, Hiroyuki

A signal amplifier controls an output amplitude of a differential transmitted from an amplifier circuit to two output terminals via each of 2N number of MOS transistors that operate as a switch by switching a control value n, and includes an amplitude-control-word switching unit that multiplies the control value n by a value 1 or a value −1 and switches between an amplitude control word of a value (N+n) and an amplitude control word of a value (N−n) of a complementary 2N-bit amplitude ...

Apparatus and method for broadband amplifier linearization

Patent Number: 8102207
Publication Date: 2012-01-24
Inventor: Day, Chris J.

An apparatus and method to improve broadband amplifier linearization. The present circuits make use of pre-distortion techniques to improve the 3^rdorder distortion of an amplifier to reduce the amount of DC power required to achieve a given system requirement. In addition, the amplifiers have broadband characteristics which lend themselves to simplified pre-distortion. A pre-distortion linearizer circuit is connected across the input terminals of an amplifier. The linearizer ...

Multi-path, multi-stage feed-forward operational amplifier circuit

Patent Number: 8102206
Publication Date: 2012-01-24
Inventor: Shibata, Hajime

An embodiment of an amplifier circuit includes a plurality of amplifiers connected between input and output terminals to form at least partially parallel amplification paths between the terminals. A first plurality of the amplification paths include series-connected pluralities of the amplifiers and share a common first series-connected amplifier, and a second plurality of the amplification paths have different first amplifiers. Optionally, a third plurality of the amplification paths ...

Amplifier module with multiple operating modes

Patent Number: 8102205
Publication Date: 2012-01-24
Inventors: Hadjichristos, Aristotele; Nejati, Babak; Pletcher, Nathan M

An amplifier module with multiple operating modes is described. In an exemplary design, the amplifier module includes an amplifier (e.g., a power amplifier), a switch, and an output circuit. The amplifier receives and amplifies an input signal and provides an amplified signal in a first mode. The switch is coupled to the output of the amplifier and bypasses the amplifier and provides a bypass signal in a second mode. The output circuit is coupled to the amplifier and the switch. The output ...

Amplifiers with input offset trim and methods

Patent Number: 8102204
Publication Date: 2012-01-24
Inventors: Eschauzier, Rudy G. H.; van Rijn, Nico

Amplifiers with power-on trim and methods using an amplifier system having an amplifier system input and an amplifier system output, an amplifier, a comparator, a successive approximation register having an input coupled to an output of the comparator, a first switch for switching an input of the amplifier from the amplifier system input to shorting the amplifier input, a second switch for switching an output of the amplifier from the amplifier system output to an input of the comparator, ...

Offset cancellation in a capacitively coupled amplifier

Patent Number: 8102203
Publication Date: 2012-01-24
Inventors: Ho, Ronald; Fairbanks, Scott M.; Proebsting, Robert; ; Drost, Robert J.

A method for calibrating an offset voltage of an amplifier used to amplify capacitively coupled communication signals is described. During this process, a common voltage is applied to one or more inputs to the amplifier. Next, an output of the amplifier is iteratively, measured, and charge is applied to the one or more inputs until the offset voltage is less than a pre-determined value. Note that applying the charge may involve applying a sequence of one or more charge ...

RF power amplifier and RF power module using the same

Patent Number: 8098102
Publication Date: 2012-01-17
Inventors: Soga, Takashi; Tanaka, Satoshi; Hase, Masatoshi; Ito, Masahiro

The RF power amplifier circuit including multiple amplification stages has a previous-stage amplifier, a next-stage amplifier and a controller. The previous-stage amplifier responds to an RF transmission input signal. The next-stage amplifier responds to an amplification signal output by the previous-stage amplifier. In response to an output-power-control voltage, the controller controls the former- and next-stage amplifiers in quiescent current and gain. In response to the ...

Method of achieving high selectivity in receiver RF front-ends

Patent Number: 8098101
Publication Date: 2012-01-17
Inventors: Savla, Anup; Brockenbrough, Roger

According to some embodiments, an apparatus may comprise an amplifier, wherein the amplifier comprises: an output stage formed of a positive output terminal providing a positive output voltage and a negative output terminal providing a negative output voltage; a load tank coupled in parallel with the output stage and configured to filter signals received at the amplifier; and a negative resistance block coupled in parallel with the output stage and the load ...

Variable gain amplifiers

Patent Number: 8098100
Publication Date: 2012-01-17
Inventors: Chen, Shin-Fu; Tseng, Po-Sen

Variable gain amplifiers with controllable gain gradient over temperature. A variable gain amplification circuit comprises an input terminal receiving an input signal, an output terminal outputting an output signal, and a control terminal receiving a first gain control signal. The relationship between gain of the variable gain amplification circuit and temperature is programmable rather than temperature independent, and is controlled by the first gain control signal obtained by a second ...

Broadband high output current output stage

Patent Number: 8098099
Publication Date: 2012-01-17
Inventors: Kao, Min-Sheng; Wu, Jen-Ming; Hsu, Yu-Hao

A broadband high output current output stage includes at least one first differential pair for enhancing the bandwidth. A second differential pair is further disposed in the circuit. The second differential pair is coupled to one of the first differential pair, such that a large output voltage swing is distributed to all transistors to avoid breakdowns thereof. A feedback unit is connected between each bias unit and the first differential pair. The first compensation unit compensates the ...

Amplifier circuit, integrated circuit device, and electronic instrument

Patent Number: 8098098
Publication Date: 2012-01-17
Inventor: Fukuzawa, Akihiro

An amplifier circuit includes an amplifier section that includes a P-type differential section, an N-type differential section, and an output section, an offset adjustment section that adjusts an offset of the amplifier section, a first offset adjustment register that stores a first offset adjustment value for the P-type differential section, a second offset adjustment register that stores a second offset adjustment value for the N-type differential section, and a control section that sets ...

Radio frequency buffer

Patent Number: 8098097
Publication Date: 2012-01-17
Inventors: Kriz, Jeffrey; Abdelli, Said

Systems, methods, and devices for receiving a differential input signal and generating a non-differential output signal are described herein. For example, an RF buffer is described that includes first and second transistor elements. The first transistor element receives a first polarity signal of a differential signal and drives a non-differential output of the RF buffer. A second transistor element receives a second polarity signal of the differential signal and drives the non-differential ...

Device and method for generating an output signal

Patent Number: 8098096
Publication Date: 2012-01-17
Inventor: Traub, Johann

An embodiment provides a device for generating an output signal as a function of an input signal, wherein a plurality of circuit sections generate partial signals and the output signal is composed from the partial ...

Power amplifier

Patent Number: 8098095
Publication Date: 2012-01-17
Inventors: Choi, Jae Hyouck; Song, Young Jean; Nam, Joong Jin; Kim, Youn Suk; Bae, Hyo Gun; Won, Jun Goo; Kim, Ki Joong; Kim, Sang Hee

Disclosed herein is a power amplifier. The power amplifier includes N power amplification means, a transformer, and a harmonic elimination unit. Each of the N power amplification means amplifies an input signal into a predetermined level. The transformer includes N/2 primary windings respectively connected to the output terminals of the power amplification means and a secondary winding configured such that coil elements are connected in series between an output terminal and a ground, and ...

Instrumentation input systems

Patent Number: 8098094
Publication Date: 2012-01-17
Inventor: Gilbert, Barrie

An input stage for an instrumentation system may include a resistor coupled between an input terminal and a summing node, and an amplifier arranged to maintain the voltage at the summing node. In anther embodiment, an instrumentation input system may include an input stage to receive a signal to be measured, and a variable gain amplifier having an input coupled to an output of the input stage, wherein the variable gain amplifier comprises two or more gain stages. A variable gain amplifier ...

Efficient envelope tracking power supply for radio frequency or other power amplifiers

Patent Number: 8098093
Publication Date: 2012-01-17
Inventor: Li, Yushan

An apparatus includes an envelope tracking power supply configured to control a power amplifier. The power supply includes a first amplifier configured to receive an input voltage and generate a supply voltage for the power amplifier. The power supply also includes a second amplifier configured to receive a shifted input voltage. An output of the second amplifier is coupled to the first amplifier. The first amplifier is configured to maintain an operational mode of the power amplifier. The ...

Power amplifier

Patent Number: 8098092
Publication Date: 2012-01-17
Inventors: Takano, Takeshi; Miyashita, Takumi

A Doherty amplifier is provided with a clipping circuit for making signal power flow to ground if the signal power becomes equal to or higher than a predetermine value in order to prevent a carrier amplifier, which is a small amplifier, from being destroyed if the signal power is increased to a sevenfold to tenfold multiple of a ratio of the size of the carrier amplifier to that of a peak ...

Method in the compensation of unlinearities in an amplifier, and uses of the method and the amplifier

Patent Number: 8098091
Publication Date: 2012-01-17
Inventors: Anderskouv, Niels; Risbo, Lars; Morch, Thomas

In a method and an amplifier for the compensation of unlinearities e.g. of the class D type, wherein an audio signal is pulse-width modulated, e.g. with a carrier wave signal in the form of a triangular signal to provide a pulse-width modulated small-signal, the so-called multiplicative error signals, which occur prior to the provision of a pulse-width modulated great-signal (7), are detected in a detector (10)).

It is noted that the carrier wave signal could be analog ...