An Adaptive Body-Biased VCO with Voltage-Boosted Switched Tuning in 0.5-V Supply

Park, Dongmin; Cho, Seonghwan

doi:10.1109/esscir.2006.307476

Cited by 27 publications

(14 citation statements)

References 7 publications

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“…Fig. 3 shows a 2-bit switched capacitor array with a voltage boosting circuit [3]. The voltageboosting circuit consists of two PMOS transistors (M B1 and M B2 ) and two voltage charging capacitors (C B1 , C B2 ).…”

Section: Proposed Vco Designmentioning

confidence: 99%

“…However, the low supply voltage results in a narrower frequency tuning range of the VCO by decreasing the tuning range of the control voltage of a MOS varactor. Several VCO topologies have been studied to obtain the low phase noise and the wide frequency tuning range at a low supply voltage [1,2,3,4]. Among those designs, a switched capacitor array scheme has been widely adopted due to its low VCO gain and wide tuning range characteristics [4].…”

Section: Introductionmentioning

confidence: 99%

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A low supply voltage and wide-tuned CMOS Colpitts VCO

Hong

2014

IEICE Electron. Express

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This paper presents a g m -boosted differential Colpitts VCO with a switched capacitor tuning scheme which achieves low phase noise and a wide tuning range at a low supply voltage. In the proposed VCO, a voltage boosting circuit increases a turn-on resistance of the switching transistor for the capacitor array by generating higher gate bias voltage. As a result, the proposed VCO can achieve a wide frequency tuning range at a low supply voltage. The proposed VCO is implemented with 0.18-µm CMOS technology and oscillates from 3.60 to 4.14 GHz. Measurement results indicate a phase noise of !123.65 dBc/Hz at 1-MHz offset at 3.63 GHz, while dissipating 2.53 mA from the 0.7-V supply.

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Section: Proposed Vco Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A low supply voltage and wide-tuned CMOS Colpitts VCO

Hong

2014

IEICE Electron. Express

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“…And the papers [5,6] about low power VCO used large inductor which occupies large layout area and causes relative narrow tuning range. The coupled quadrature VCOs (QVCOs) with automatic amplitude control loop [4] also occupies large layout area and degrades the phase noise due to phase mismatches [7].…”

Section: Introductionmentioning

confidence: 99%

“…1. The VCO_CORE is composed of negative-G m (M 1 -M 4 ) and PMOS tail current source (M 5 ), adaptive body biasing (ABB) circuit (M 6 -M 9 ) [5], varactor, capacitor bank, spiral inductor. The optimum capacitor bank is controlled by C_CONT\7:0[.…”

Section: Introductionmentioning

confidence: 99%

A 84% tuning range, 4.3-GHz VCO with two-step negative-Gm tuning and amplitude calibration loop

Park

Kim

et al. 2010

Analog Integr Circ Sig Process

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This paper presents wideband, low voltage CMOS LC-VCO with automatic two-step amplitude calibration loop to compensate the PVT variation. To cover the wide tuning range, digital automatic negative-G m tuning loop and analog automatic amplitude calibration loop are proposed. The power consumption is 2-6 mA from a 1.2 V supply. The VCO tuning range is 3.4 GHz, from 2.35 to 5.75 GHz. The measured phase noise is -117 dBc/Hz at the 1 MHz offset when the center frequency is 4.313 GHz.

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“…In [6] the ABB is implemented by NMOS only, but in the proposed circuit, the ABB is implemented by both NMOS and PMOSs and the capacitor used to store the feedback voltage is replaced by the parasitic capacitors. M9 and M10 are symmetric NMOS pairs.…”

Section: Analysis Of Vco Architecturementioning

confidence: 99%

A Low Power Low Phase Noise Lc Voltage-Controlled Oscillator

Zhou

Shum

Cheung³

et al. 2013

PIER Letters

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Abstract-A low phase noise CMOS complementary cross-coupled LC-tank voltage-controlled oscillator (VCO), implemented with TSMC 0.18 µm 1P6M CMOS technology, is presented. Double pair pseudoresistance transistors biased by the tapped center of the inductor are utilized to reduce the DC bias current. The circuit consumes 1.55 mA from a 1.5 V supply voltage which saves up to 52.4% power, compared with the conventional one. Furthermore, an adaptive body biasing technique (ABB) is used to overcome the effect of PVT variations. The VCO is tunable from 2.58 to 3.07 GHz and has a phase noise −122.7 dBc/Hz at 1 MHz offset from the 3 GHz carrier. The Figure

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An Adaptive Body-Biased VCO with Voltage-Boosted Switched Tuning in 0.5-V Supply

Cited by 27 publications

References 7 publications

A low supply voltage and wide-tuned CMOS Colpitts VCO

A low supply voltage and wide-tuned CMOS Colpitts VCO

A 84% tuning range, 4.3-GHz VCO with two-step negative-Gm tuning and amplitude calibration loop

A Low Power Low Phase Noise Lc Voltage-Controlled Oscillator

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