Low Power and High Efficiency VCO and Quadrature VCO Circuits Constructed with Transconductance-Enhanced Colpitts Oscillator Feature

Shie, Ching-Ian; Chiang, Yuan‐Cheng; Lin, Jiunn-Yuan

doi:10.1093/ietele/e91-c.2.193

Cited by 14 publications

(14 citation statements)

References 9 publications

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“…The simulated phase noise of the proposed Quadrature VCO at 5.4 GHz center frequency is compared to that of [11] in Fig. 5.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…5. For the purpose of this simulation, the parameters of each circuit are chosen such that both have the same oscillation frequency and power dissipation (the coupling technique proposed in [11] was utilized and simulated in 0.18-m CMOS technology).…”

Section: Simulation Resultsmentioning

confidence: 99%

“…In [11] two complementary Colpitts VCOs are coupled to each other via four parallel coupling transistors. However, parallel transistors dissipate power and can degrade the phase noise of the QVCO.…”

Section: Introductionmentioning

confidence: 99%

“…Simulated phase noise of the proposed QVCO (for different coupling factors) and that of P-QVCO with coupling technique proposed in[11].…”

mentioning

confidence: 99%

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A Colpitts CMOS Quadrature VCO Using Direct Connection of Substrates for Coupling

Ebrahimi

Naseh

2013

IEEE Trans. VLSI Syst.

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A new low-phase noise low-power quadrature voltage-controlled oscillator (QVCO) using differential Colpitts oscillator is presented. The proposed QVCO is composed of two identical current-switching differential Colpitts VCOs in which the first core VCO is coupled to the second in an in-phase manner, and the second core VCO is coupled to the first in an anti-phase manner. To couple the two core VCOs, the substrates of the cross-connected transistors as well as the substrates of MOS varactors are used; alleviating the need for any extra elements for coupling, which could add noise and increase power dissipation. A linear (sinusoidal) analysis is presented that confirms that the proposed circuit generates quadrature waveforms. The proposed coupling technique can be generalized to differential Colpitts VCOs for multiphase signals generation.Index Terms-Current-switching Colpitts-oscillator, low-phase noise, multiphase, quadrature oscillator.

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“…The simulated phase noise of the proposed Quadrature VCO at 5.4 GHz center frequency is compared to that of [11] in Fig. 5.…”

Section: Simulation Resultsmentioning

confidence: 99%

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Simulated phase noise of the proposed QVCO (for different coupling factors) and that of P-QVCO with coupling technique proposed in[11].…”

mentioning

confidence: 99%

See 2 more Smart Citations

A Colpitts CMOS Quadrature VCO Using Direct Connection of Substrates for Coupling

Ebrahimi

Naseh

2013

IEEE Trans. VLSI Syst.

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“…Thus CMOS technology is adopted to construct RF circuits and various CMOS VCOs are reported for achieving the characteristics of low power consumption and low phase noise. In a published paper [3], a configuration of oscillator constructed by cascoding an NMOS cross-coupled pair under a PMOS Colpitts oscillator was proposed, as shown in Figure 1. It decreases the power consumption and retains the benefit of the low phase noise of the Colpitts PMOS oscillator.…”

Section: Introductionmentioning

confidence: 99%

A CMOS Colpitts voltage controlled oscillator with an enhanced transconductance method

Shie

Chiang

2008

Micro & Optical Tech Letters

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Analysis and review of main characteristics of Colpitts oscillators

Hemmati

Dehghani

2021

Circuit Theory & Apps

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Summary In this review, different topologies of CMOS Colpitts oscillators including single‐ended and differential configurations are studied, and the main specifications of them are presented. The studied LC tank Colpitts oscillators operating at gigahertz frequencies are categorized in several main structures to have more insight into their comparison. Also, the main characteristics of the Colpitts voltage‐controlled oscillators (VCOs) are compared and analyzed according to their configurations and calculated results of their transconductances. Besides, the Colpitts quadrature voltage‐controlled oscillators (QVCOs) realized by the mentioned VCOs are studied and categorized. Also, the various coupling techniques adopted in each QVCO to generate output signals with 90° phase differences are highlighted.

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Low Power and High Efficiency VCO and Quadrature VCO Circuits Constructed with Transconductance-Enhanced Colpitts Oscillator Feature

Cited by 14 publications

References 9 publications

A Colpitts CMOS Quadrature VCO Using Direct Connection of Substrates for Coupling

A Colpitts CMOS Quadrature VCO Using Direct Connection of Substrates for Coupling

A CMOS Colpitts voltage controlled oscillator with an enhanced transconductance method

Analysis and review of main characteristics of Colpitts oscillators

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