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Low-noise voltage controlled oscillator

Patent Number: 8111110
Publication Date: 2012-02-07
Inventors: Yamakawa, Junichiro; Akaike, Kazuo; Nakaoka, Takashi; Takano, Mikio; Arai, Yuichiro

A low-noise voltage controlled oscillator is provided, to improve a phase noise characteristic and widen a frequency variable range. The low-noise voltage controlled oscillator is configured so that an oscillation element and a capacitor 2 are connected in series between a collector C and an emitter E of a transistor 1, capacitors 3 and 4 are connected in series between the collector C and the emitter E, an electrical potential between the capacitors 3 and ...

Temperature compensated piezoelectric oscillator

Patent Number: 8111109
Publication Date: 2012-02-07
Inventor: Kubota, Hajime

An oscillator that includes a movable element formed of silicon, the movable element vibrating by electrostatic force, a stationary element supporting the movable element, a temperature detector located in contact with the stationary element, the temperature detector detecting the temperature of the stationary element, a supporting element joined to a joint surface between the movable element and the stationary element, the supporting element supporting the movable element, the stationary ...

Micromechanical resonating devices and related methods

Patent Number: 8111108
Publication Date: 2012-02-07
Inventors: Gaidarzhy, Alexei; Mohanty, Pritiraj

Micromechanical resonating devices, as well as related methods, are described herein. The resonating devices can include a micromechanical resonating structure, an actuation structure that actuates the resonating structure, and a detection structure that detects motion of the resonating ...

Charge pump control scheme

Patent Number: 8111107
Publication Date: 2012-02-07
Inventor: Huang, Ming-Chieh

An integrated circuit includes a charge pump having a voltage output. A voltage level detector is arranged to receive the voltage output, wherein the voltage level detector provides a first enable signal for the charge pump. A ring oscillator has multiple inverters. The ring oscillator is coupled to the charge pump. A counter control circuit is configured to provide a control signal for adjusting a frequency of the ring oscillator based on the first enable signal of the voltage level ...

Switched phase and frequency detector based DPLL circuit with excellent wander and jitter performance and fast frequency acquisition

Patent Number: 8111106
Publication Date: 2012-02-07
Inventors: Ao, Jiening; McKinney, Larry Stephen; Montreuil, Leo; Jenkins, Joel Paul

Some embodiments of the present invention may include a DPLL circuit comprising a firmware. The firmware may comprise a re-sampled NCO phase detector capable of receiving a reference clock timing signal and a VCXO clock timing signal. The re-sampled NCO phase detector may comprise a resampler capable of receiving phase output and the VCXO clock timing signal and resampling the phase output; and a subtractor capable of receiving the resampled phase output and subtracting the resampled phase ...

Voltage-controlled oscillator, phase-locked loop circuit and clock data recovery circuit

Patent Number: 8106719
Publication Date: 2012-01-31
Inventor: Hosoya, Kenichi

A voltage-controlled oscillator is provided with inductor 7a arranged between a power supply and a ground; and a variable capacitive section 56 that configures a resonator circuit with inductor 7a. Variable capacitive section 56 is provided with first and second control terminals 1, 2 to which a voltage is applied to change the capacitance. Variable capacitive section 56 includes first variable capacitive element 9a wherein one terminal is connected ...

GM-boosted differential drain-to-source feedback colpitts voltage controlled oscillator

Patent Number: 8106718
Publication Date: 2012-01-31
Inventors: Lee, Sang-Gug; Hong, Jong-Phil

A voltage controlled oscillator outputting a differential signal includes: an inductor connected to a first power supply supplying first voltage; first and second transistors for differential switching; first and second variable capacitors connected to the inductor in parallel; a third transistor of which a gate electrode is connected to a first node; and a fourth transistor of which a gate electrode is connected to a second node. When bias voltage is applied to the gate electrode of the ...

Quantum gate method and apparatus

Patent Number: 8106717
Publication Date: 2012-01-31
Inventors: Goto, Hayato; Ichimura, Kouichi

A method includes causing a common-resonator mode resonating with a transition between |2>_iand |3>_ithat are coupled to each other by a transition having a homogenous broadening ΔE_homogreater than an energy difference between |0>_iand |1>_i, an energy difference between |2>_iand |3>_ibeing greater than ΔE_homo, transferring states of m quantum bits represented by |0>_kand |1>_kto ...

Oscillator, oscillator implementations and method of generating an oscillating signal

Patent Number: 8106716
Publication Date: 2012-01-31
Inventor: Kim, Chan-kyung

One embodiment of the oscillator includes a first starved inverter and a second starved inverter. An inner inverter of the second starved inverter is cross-coupled to an inner inverter of the first starved inverter. The oscillator further includes a first inverter connected to output of the inner inverter of the first starved inverter, and a second inverter connected to output of the inner inverter of the second starved ...

Low-power oscillator

Patent Number: 8106715
Publication Date: 2012-01-31
Inventors: Nezamfar, Bita; Mehta, Srenik

In order to decrease the temperature sensitivity of an oscillator output, and obtain a frequency of oscillation that remains stable over variations in temperature, two oscillators may be configured with identical comparators and logic circuitry, but having different oscillation frequencies. The different oscillation frequencies may be achieved by configuring each oscillator with a respective resistor divider circuit configured to adjust the reference voltage at the reference input of the ...

Adjustable capacitor, digitally controlled oscillator, and all-digital phase locked loop

Patent Number: 8106714
Publication Date: 2012-01-31
Inventors: Jeong, Deog-Kyoon; Oh, Do-hwan; Choo, Kyo-Jin

An adjustable capacitor is provided including a capacitor unit including a plurality of capacitor groups aligned in a matrix format and a switch unit to adjust capacitance by connecting the plurality of capacitor groups in parallel according to a selection signal of a column and row of the matrix. Accordingly, the adjustable capacitor may be realized of a small size but with a high capacitance change ...

Parallel-structured switched variable inductor circuit

Patent Number: 8102218
Publication Date: 2012-01-24
Inventors: Eo, Yun-seong; Bang, Hee-mun; Lee, Kwang-du; Lee, Heung-bae

An inductor circuit includes a pair of inductors connected in parallel with each other and a switch for turning on and off electric power to one of the pair of inductors. The inductance of the inductor circuit can be varied and the quality factor Q can be improved. Further, RF circuits employing the inductor circuit can generate an intended operating ...

Oscillator having feedback path which is capable of supplying reduced voltage potential to oscillation circuit

Patent Number: 8102217
Publication Date: 2012-01-24
Inventor: Aoki, Hiroyuki

An oscillator creates a reference voltage based on a pulse signal corresponding to an oscillation output of a crystal oscillation circuit and controls a supply voltage to the crystal oscillation circuit according to the reference voltage. A control signal creating circuit creates a control signal based on the pulse signal and reference voltage generating circuits that control the reference voltage based on the control signal. The control signal creating circuit creates a low-level control ...

Voltage controlled oscillator having reduced phase noise

Patent Number: 8102216
Publication Date: 2012-01-24
Inventor: Kaczynski, Brian

A VCO comprises an LC tank circuit coupled to a plurality of cross-coupled transistor devices. A first resonance frequency of a waveform output of the VCO is dependent upon the values of a first capacitor and a first inductor of the LC tank. The VCO further comprises a first series LC resonator comprising a second capacitor and a second inductor in parallel to the first capacitor and the first inductor. The values of the second capacitor and second inductor are selected to produce a second ...

Compensated high-speed PLL circuit

Patent Number: 8102215
Publication Date: 2012-01-24
Inventor: Birth, Winfrid

The invention relates to a compensation method and phase-locked loop (PLL) circuit, wherein different kinds of two-point modulations are used and the integral regulator of a loop filter is replaced by introducing predetermined settings at the loop filter or at a voltage controlled oscillator. Thereby, the dynamic settling time of the PLL circuit can be improved to gain time for other circuit components which can thus assure required precision for the ...

Reduced phase noise multi-band VCO

Patent Number: 8098111
Publication Date: 2012-01-17
Inventors: Chen, Calvin (Shr-Lung); Vadipour, Morteza; Chen, Xinyu

Embodiments of a multi-band voltage controlled oscillator (VCO) are provided herein. The multi-band VCO is configured to adjust a frequency of an output signal based on an input signal. The multi-band VCO includes a tank module, an active module, and a control module. The tank module includes a parallel combination of a capacitor and an inductor. The active module includes a pair of cross-coupled transistors that are configured to provide a negative conductance that cancels out a positive ...

Phase locked loop apparatus with selectable capacitance device

Patent Number: 8098110
Publication Date: 2012-01-17
Inventors: Yang, Bo; Muthali, Harish S.; Barnett, Kenneth C.

A phase locked loop apparatus includes an oscillator, a variable capacitance device, a selectable capacitance device, and a capacitance controller that is configured to provide a control signal to the selectable capacitance device. The selectable capacitance device is connected to the oscillator and is responsive to the control signal such that the selectable capacitance device has a first capacitance at a first control signal value and a second capacitance at a second control signal value. ...

Differential varactor circuit for a voltage controlled oscillator

Patent Number: 8098109
Publication Date: 2012-01-17
Inventors: Chen, Shr-Lung; Li, Qiang; Chen, Richard

According to one exemplary embodiment, a differential varactor circuit for a voltage controlled oscillator having two differential outputs includes a first varactor having first and second terminals and a second varactor having first and second terminals. In the differential varactor circuit, each of the first and second terminals of the first varactor and each of the first and second terminals of the second varactor are coupled to one of the two differential outputs of the voltage ...

Microwave oscillator using integrated circuit technology

Patent Number: 8098108
Publication Date: 2012-01-17
Inventors: Domnesque, Denis; Gourdon, Cyril; Sevin, Remi

The invention relates to a millimeter frequency oscillator using integrated circuit technology. The oscillator includes a microwave output (Sf) providing an oscillation frequency F_outas a function of a control signal Vt. The oscillation frequency F_outmay be modulated around a central frequency Fc via two control inputs of the oscillator, a first control input Ec1 driven by a first control signal Vt1 fixing the central frequency Fc of the oscillator and ...

Voltage/current regulator system using constant loop gain

Patent Number: 8098107
Publication Date: 2012-01-17
Inventor: Mirow, Fred

A system for providing voltage and current regulator sources based on a oscillator having variable loop gain is described. Only when the oscillator loop gain is at least the value of one does the oscillator oscillate. The oscillator's ability to oscillate is controlled by the one or more variable impedance or gain devices. Negative feedback of the voltage or current output level is used to control the loop gain of the oscillator ...

Low noise voltage controlled oscillator (VCO)

Patent Number: 8098106
Publication Date: 2012-01-17
Inventors: Brunn, Brian; Sutardja, Sehat

In one embodiment, a voltage controlled oscillator (VCO) includes a tank circuit having a first node and a second node. A first pair of transistors includes a first transistor and a second transistor each having a gate, a drain, and a source. The gates of the first transistor and the second transistor are coupled together and coupled to the first node. A second pair of transistors includes a third transistor and a fourth transistor each having a gate, a drain, and a source. The gates of ...

Spin-valve or tunnel-junction radio-frequency oscillator

Patent Number: 8098105
Publication Date: 2012-01-17
Inventors: Cyrille, Marie-Claire; Nodin, Jean-Francois; Sousa, Veronique; Delaet, Bertrand

This radio-frequency oscillator includes a magnetoresistive device in which an electric current is able to flow. The magnetoresistive device includes a first magnetic layer, known as a “trapped layer”, whereof the magnetization is of fixed direction. The magnetoresistive device further includes a second magnetic layer known as a “free layer” and a non-magnetic layer, known as an “intermediate layer”, interposed between the first and second layer, known as the intermediate layer. ...

Estimation and compensation of oscillator nonlinearities

Patent Number: 8098104
Publication Date: 2012-01-17
Inventors: Neubauer, Volker; Bauernfeind, Thomas; Wicpalek, Christian; Mayer, Thomas; Maurer, Linus

A device may include an oscillator circuit, a control circuit, a frequency detector circuit, and a processor circuit. The oscillator circuit may include a frequency control input to output an oscillator signal. The frequency of the oscillator signal depends on an input signal applied to the frequency control input. The control circuit is configured to apply a first input signal value, a second input signal value, and a third input signal value to the frequency control input. The frequency ...

PLL disturbance cancellation

Patent Number: 8098103
Publication Date: 2012-01-17
Inventors: Ballantyne, Gary J.; Geng, Jifeng; Filipovic, Daniel F.

Techniques for cancelling a disturbance signal from a PLL output signal. In an aspect, a cancellation signal is combined with the signal input to a VCO or DCO in the PLL. In a further aspect, the appropriate cancellation signal is derived by analyzing one or more signals within the PLL. The signals within the PLL may be correlated against one or more disturbance signal templates, such as a sinusoid having a known frequency, to derive one or more correlation coefficients. The coefficients ...