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Voltage-controlled oscillator

About: Voltage-controlled oscillator is a research topic. Over the lifetime, 23896 publications have been published within this topic receiving 231875 citations. The topic is also known as: VCO.


Papers
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Patent
14 Jun 1971
TL;DR: In this article, a signal selection and processing system for use with a broadband LORAN receiver in which the average of the strongest interfering signal having a predetermined duty cycle sets the AGC level and, via a special frequency discriminator, controls the frequency of a voltage controlled oscillator (VCO).
Abstract: A signal selection and processing system for use with a broadband LORAN receiver in which the average of the strongest interfering signal having a predetermined duty cycle sets the AGC level and, via a special frequency discriminator, controls the frequency of a voltage controlled oscillator (VCO). The VCO output is used to shift the entire band of input frequencies so that said strongest signals fall into the attenuating notch of a notch filter while passing the other signals to the LORAN receiver.

65 citations

Journal ArticleDOI
TL;DR: A fully-integrated quadrature low-IF L1-band GPS receiver consumes only 6.4 mW in 0.13 μm CMOS and has inherent anti-alias filtering, which simplifies the overall system.
Abstract: A fully-integrated quadrature low-IF L1-band GPS receiver consumes only 6.4 mW in 0.13 μm CMOS. The RF front-end features a gate-modulated quadrature VCO for low phase noise and accurate quadrature phase signal generation. It merges the LNA, quadrature mixer, and quadrature VCO in a single current-reuse stacked topology that provides a conversion gain 42.5 dB with a power consumption of 1 mW. A continuous-time (CT) quadrature bandpass sigma-delta analog-to-digital converter (ADC) provides inherent anti-alias filtering, which simplifies the overall system. The second-order CT ΣΔ ADC achieves 65 dB dynamic range and dissipates only 4.2 mW using resistor DAC feedback. The receiver exhibits an NF of 6.5 dB and an IIP3 of - 30 dBm; the PLL phase noise is -110 dBc/Hz @ 1 MHz frequency offset with quadrature error less than 1°.

65 citations

Journal ArticleDOI
TL;DR: A 300 GHz frequency synthesizer incorporating a triple-push VCO with Colpitts-based active varactor (CAV) and a divider with three-phase injection is introduced, which provides frequency tunability, enhances harmonic power, and buffers/injects the VCO fundamental signal from/to the divider.
Abstract: A 300 GHz frequency synthesizer incorporating a triple-push VCO with Colpitts-based active varactor (CAV) and a divider with three-phase injection is introduced. The CAV provides frequency tunability, enhances harmonic power, and buffers/injects the VCO fundamental signal from/to the divider. The locking range of the divider is vastly improved due to the fact that the three-phase injection introduces larger allowable phase change and injection power into the divider loop. Implemented in 90 nm SiGe BiCMOS, the synthesizer achieves a phase-noise of -77.8 dBc/Hz (-82.5 dBc/Hz) at 100 kHz (1 MHz) offset with a crystal reference, and an overall locking range of 280.32-303.36 GHz (7.9%).

65 citations

Proceedings Article
01 Jan 1998
TL;DR: In this article, a 1.4 GHz LC voltage-controlled oscillator has been implemented in a MOSIS 0.5/spl mu/m CMOS process, and the measured phase noise is -10/sup 7/ dBc/Hz with 3 mW power dissipation from a 3.0 V supply.
Abstract: A 1.4-GHz LC voltage-controlled oscillator has been implemented in a MOSIS 0.5-/spl mu/m CMOS process. Complementary cross-coupled PMOS and NMOS transistors enhance single-ended symmetry at each of the resonant nodes, reducing close-in phase noise. Tapped bond wires provide a resonant tank with high Q. At an offset frequency of 100 kHz, the measured phase noise is -10/sup 7/ dBc/Hz with 3 mW power dissipation from a 3.0 V supply. NMOS gate capacitors achieve a 17% tuning range.

65 citations

Patent
31 Jan 1994
TL;DR: In this paper, a voltage controlled oscillator (VCO) provides an output signal with an output frequency that varies only minimally for any given input control voltage despite variations in the manufacturing process, temperature and supply voltage.
Abstract: A voltage controlled oscillator (VCO) provides an output signal with an output frequency that varies only minimally for any given input control voltage despite variations in the manufacturing process, temperature and supply voltage. The VCO also includes a multistage ring oscillator which includes a plurality of series-connected current-starved inverter stages. The VCO utilizes a first current source to provide a substantially constant current independent of process, temperature and supply voltage and a second current source to provide a variable current that varies in response to process, temperature and supply voltage. Both current sources generate a respective current signal independent of the input signal to the VCO. An attenuator, responsive to the VCO's input voltage signal (typically from a phase-locked loop filter) provides a control current signal to the ring oscillator. The attenuator receives a supply current created by subtracting the second current from the first current, and utilizes a differentiation subcircuit that attenuates the supply current in response to changes in an input voltage to produce a current control signal that sets the current level in the ring oscillator's cells. The frequency of oscillation of the ring oscillator is determined by the control current signal. Additionally, the VCO circuit may include a current mirror for receiving the control current signal from the attenuator and mirroring the control current signal to the ring oscillator.

65 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023168
2022344
2021269
2020388
2019469
2018530