A 900 MHz CMOS LC-oscillator with quadrature outputs

Rofougaran, A.; Rael, J.J.; Rofougaran, M.; Abidi, A.A.

doi:10.1109/isscc.1996.488731

Cited by 422 publications

(210 citation statements)

References 3 publications

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“…1(a) [14] (P-QVCO, so-called because the transistors coupling the two differential oscillators are in parallel with the differential oscillators 5 ), the "series" QVCO in Fig. 1(b) [1] (here to be referred to as top-series QVCO, TS-QVCO, since the coupling transistors are in series with the switch transistors, and placed above them), and the bottom-series QVCO of Fig.…”

Section: Phase-noise Simulationsmentioning

confidence: 99%

On the phase-noise and phase-error performances of multiphase LC CMOS VCOs

Andreani

Wang

2004

IEEE J. Solid-State Circuits

187

113

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Section: Phase-noise Simulationsmentioning

confidence: 99%

On the phase-noise and phase-error performances of multiphase LC CMOS VCOs

Andreani

Wang

2004

IEEE J. Solid-State Circuits

187

113

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“…The cascode-coupling oscillator of [2] uses an efficient coupling scheme to have lower phase noise with good phase accuracy. It has improved the phase noise about 6 dB in comparison to the typical QVCO [1] but however, its phase noise is still high. The cascode-coupling topology uses cascode transistors to couple two VCO's [2].…”

Section: Cascode-coupling and Sipc Topologiesmentioning

confidence: 99%

“…In the coupled-oscillators techniques to design QVCO, there is a trade off between the quadrature phase accuracy and the oscillator phase noise [1,2,3,4]. Also the phase noise of QVCO's is not as good as individual VCO's.…”

Section: Cascode-coupling and Sipc Topologiesmentioning

confidence: 99%

“…Since introduction of the coupled VCO's method to design QVCO, which was proposed by Rofougaran [1], coupled-oscillators has become one of the most commonly used method for quadrature LO (Local Oscillator) signal generation [1,2,3,4,5]. The main issue in designing QVCO is to obtain lower phase noise with precise quadrature outputs with a limitation on the oscillator power consumption [2,3,4,5].…”

Section: Introductionmentioning

confidence: 99%

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Source-injection serial coupled CMOS LC quadrature VCO

Jannesari

Kamarei

2007

IEICE Electron. Express

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A novel source-injection serial-coupled (SISC) topology for designing LC quadrature voltage-controlled-oscillator (QVCO) is proposed. The proposed topology uses the advantages of the cascodecoupling QVCO and source-injection parallel-coupled (SIPC) QVCO topologies and provides a good phase noise performance with good quadrature phase accuracy. A 1.8 GHz, 1.8 v designed QVCO based on this topology shows a phase noise of −136 dBc/Hz at 1 MHz offset frequency thereby showing 5 dB and 7.3 dB lower phase noise than the SIPC and the cascode-coupling topologies respectively. This result is obtained from the simulation based on 0.18 u CMOS technology and on-chip spiral inductor with Q of 8.

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“…The design procedure of QVCO is as follows: (1) finding the LC -resonator often based on right-handed (RH) transmission line (TL) structures or scarcely with left-handed (LH) structures [3,4], (2) combining the LCresonator with active transistors to form the differential VCOs in crosscoupled, Colpitts, or Clapp form, and (3) using two differential VCOs and passive or active coupling devices or a composite to ensure the two VCOs run in quadrature phase. The most popular QVCOs [5,6] with parallel-coupled or bottom/top-series coupling transistors can be analyzed with the method described in [5], and the coupling devices may introduce the injection flicker noise and degrade the phase noise of oscillator. When large coupling MOSFETs are used the power consumption increases.…”

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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A 900 MHz CMOS LC-oscillator with quadrature outputs

Cited by 422 publications

References 3 publications

On the phase-noise and phase-error performances of multiphase LC CMOS VCOs

On the phase-noise and phase-error performances of multiphase LC CMOS VCOs

Source-injection serial coupled CMOS LC quadrature VCO

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

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