G/sub m/-boosted common-gate LNA and differential colpitts VCO/QVCO in 0.18-/spl mu/m CMOS

Li, Xiaoyong; Shekhar, Sudip; Allstot, D.J.

doi:10.1109/jssc.2005.857426

Cited by 295 publications

(23 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the conventional Colpitts VCO has the weakness of poor start-up. Differential Colpitts VCOs are developed to overcome the poor start-up while keeping the low phase noise characteristic [1,2]. Also, a switched biasing technique for the tail current source is developed to suppress the phase noise in the low offset frequency [1,3].…”

Section: Introductionmentioning

confidence: 99%

“…1(a) shows a conventional Colpitts VCO, which suffers from poor startup characteristics; i.e., higher power consumption is required to make reliable start-up [2]. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 1(b) shows a differential Colpitts VCO in [2] which crosscouples the switching transistors rather than providing a fixed bias to the gate as in [1]. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…where g m1 is the transconductance of the switching transistor and B is the angular frequency [2]. The negative conductance looking into the drain of M 1 or M 2 for Fig.…”

Section: Introductionmentioning

confidence: 99%

“…From (2), it is seen that the magnitude of negative conductance of Li's VCO is increased by a factor (2 þ C 2 =C 1 ) compared to that of the conventional Colpitts VCO [2]. shows the proposed Colpitts VCO in which a series network is inserted between the drain nodes of the switching transistors.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

High performance differential Colpitts VCO with a linearized tuning range using a series resonator

2014

IEICE Electron. Express

View full text Add to dashboard Cite

This paper proposes a novel low-phase noise Colpitts voltage-controlled oscillator (VCO) using a series LC network. For the series LC network, two capacitors are connected to each node of a parallel inductor-varactor tank (PLC). Each series connection node of the network is cross-coupled to the gates of switching transistors, and a large signal swing is achieved at each connection node. Also, the fixed biasing current sources of the differential Colpitts VCO are modified to operate as switched biasing current sources to lower the phase noise. Designed in 65 nm CMOS technology, the proposed VCO achieves a linearized tuning range from 3.73 to 3.97 GHz. The VCO consumes about 0.89 mW from a 0.4 V supply voltage, and achieves the phase noise of !123.3 dBc/Hz at 1 MHz offset. The calculated figure of merit of the VCO is about !195.5 dBc/Hz/mW.

show abstract

Section: Introductionmentioning

confidence: 99%

“…1(a) shows a conventional Colpitts VCO, which suffers from poor startup characteristics; i.e., higher power consumption is required to make reliable start-up [2]. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 1(b) shows a differential Colpitts VCO in [2] which crosscouples the switching transistors rather than providing a fixed bias to the gate as in [1]. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…where g m1 is the transconductance of the switching transistor and B is the angular frequency [2]. The negative conductance looking into the drain of M 1 or M 2 for Fig.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations