A Low-Voltage Quadrature CMOS VCO Based on Voltage-Voltage Feedback Topology

Chuang, Ya Hui; Lee, S.-H.; Yen, R.-H.; Jang, Sheng‐Lyang; Juang, Miin‐Horng

doi:10.1109/lmwc.2006.885643

Cited by 37 publications

(12 citation statements)

References 9 publications

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“…When large coupling MOSFETs are used the power consumption increases. The passive coupling devices include inductor [7], transformer [8], capacitor, diode [9], varactor, and resistor. The passive devices may provide the phase shift of 90 • in the QVCO outputs and introduce less injection current noise to the LC -resonator.…”

Section: Introductionmentioning

confidence: 99%

Quadrature Vco Formed With Two Colpitts Vco Coupled via an Lc-Ring Resonator

Jang¹,

Lin²,

Chang³

et al. 2011

PIER C

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Abstract-This paper presents a new quadrature voltage-controlled oscillator (QVCO), which consists of two p-core Colpitts cross-coupled voltage-controlled oscillators (VCOs) with an LC ring resonator to provide the quadrature outputs. The proposed CMOS QVCO has been implemented with the TSMC 0.18 µm CMOS technology and the die area is 0.478×0.82 mm 2 . At the supply voltage of 1.5 V, the total power consumption is 20.4 mW. The free-running frequency of the QVCO is tunable from 9.69 GHz to 10.52 GHz as the tuning voltage is varied from 0.0 V to 2 V. The measured phase noise at 1 MHz frequency offset is −122.41 dBc/Hz at the oscillation frequency of 10.52 GHz and the figure of merit (FOM) of the proposed QVCO is −189.7 dBc/Hz.

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Section: Introductionmentioning

confidence: 99%

Quadrature Vco Formed With Two Colpitts Vco Coupled via an Lc-Ring Resonator

Jang¹,

Lin²,

Chang³

et al. 2011

PIER C

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“…These QVCOs were developed based on two core differential VCOs and a coupling network. High-performance QVCO circuits include cross-coupled oscillators [1], Colpitts oscillator [2][3][4], Armstrong oscillator [5,6], and Hartley oscillator [7]. These quadrature circuits use the parallel-tuned LC resonator.…”

Section: Introductionmentioning

confidence: 99%

A quadrature CMOS clapp voltage‐controlled oscillator

Jang

Yeh

Chang

et al. 2011

Micro & Optical Tech Letters

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A new fully integrated, CMOS Clapp quadrature voltagecontrolled oscillator (QVCO) is presented. The QVCO is composed of two differential n-core Clapp VCOs coupled by four pMOSFETs and was implemented in the 0.18-lm CMOS technology with 0.9-V supply voltage. The die area is 0.574 Â 0.866 mm 2 . At the supply voltage of 0.9 V, the total power consumption is 12.2 mW. The free-running frequency of the QVCO is tunable from 7.89 to 9.3 GHz as the tuning voltage is varied from 0 to 2 V. The measured phase noise at 1-MHz frequency offset is À118.65 dBc/Hz at the oscillation frequency of 7.89 GHz, and the figure of merit of the proposed QVCO is about À185.71 dBc/Hz.

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“…978-1-4244-3828-0/09/$25.00 ©2009 IEEE The QVCOs in [12,13] use on-chip inductors as coupling elements. Inductors, in addition to the large area they occupy, degrade phase noise due to their low quality factors.…”

Section: Introductionmentioning

confidence: 99%

A CMOS low-noise low-power quadrature LC oscillator

Ebrahimi

Naseh

2009

2009 IEEE International Symposium on Circuits and Systems

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A new quadrature LC voltage-controlled oscillator circuit configuration for CMOS technology is presented. In the proposed circuit two identical cross-connected LC-VCOs are coupled together via the bulk of the cross-connected MOS transistors and the bulk of the MOS varactors. No additional components are needed for coupling the core oscillators. Therefore, no extra noise sources and power consumption are added to the circuit, which results in good phase noise and low power consumption. The circuit can operate with V dd as low as 0.5 V. A linear analysis of the quadrature operation of the circuit is also provided. The same coupling scheme can be used for multiphase signal generation.Index terms-Low-noise, low-power, low-voltage, quadrature LC voltage-controlled oscillators (LC-QVCO), multiphase.

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A Low-Voltage Quadrature CMOS VCO Based on Voltage-Voltage Feedback Topology

Cited by 37 publications

References 9 publications

Quadrature Vco Formed With Two Colpitts Vco Coupled via an Lc-Ring Resonator

Quadrature Vco Formed With Two Colpitts Vco Coupled via an Lc-Ring Resonator

A quadrature CMOS clapp voltage‐controlled oscillator

A CMOS low-noise low-power quadrature LC oscillator

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