A linearized tuning varactor for voltage controlled oscillator

Ji, Xincun; Xia, Xiaojuan; Gu, Shi‐Pu; Guo, Yufeng

doi:10.1587/elex.14.20170730

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…Compared with [24] to [26], the proposed VCO achieves a lower phase noise and wider frequency tuning range in K-band. Meanwhile, compared with the low-frequency VCOs in [11,27,28,29], the FoM and FoM T of the proposed design are much lower, showing better overall performance. Owing to the varactor compensation technique, the variation of K VCO of this design is only 9.1%, which shows better linearity.…”

Section: Measurement Results and Comparisonmentioning

confidence: 94%

A linear dual-control-voltage K-band VCO with a Gilbert frequency multiplier

Huang

Sun

et al. 2022

IEICE Electron. Express

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This letter presents a linear K-band voltage-controlled oscillator (VCO) with a Gilbert frequency multiplier. Three pairs of varactors form a varactor compensation topology to broaden the linear frequency range and improve the VCO linearity. The varactors are tuned by two control voltages so that the frequency can be tuned in a wide range continuously. A Gilbert cell-based frequency multiplier is implemented to achieve the desired frequency with low phase noise. Fabricated in 0.13 µm CMOS technology, the total area of the proposed VCO is approximately 0.28 mm 2 . This VCO achieves a tuning range of 21.4 to 25 GHz (15.5%), and a linear tuning range between 0.5 V to 1.8 V control voltage, the mismatch of the VCO gain is only 9.1% in the linear tuning range. The output phase noise reaches −75.13 dBc/Hz at 100 kHz offset frequency and −108.53 dBc/Hz at 1 MHz offset frequency from the 24.2 GHz carrier frequency, respectively.

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Section: Measurement Results and Comparisonmentioning

confidence: 94%

A linear dual-control-voltage K-band VCO with a Gilbert frequency multiplier

Huang

Sun

et al. 2022

IEICE Electron. Express

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“…The phase domain model of the PLL ity and non-linearity, but the combination of the whole array has a overall linear tuning range. By implementing this technique, the equivalent capacitance exhibits good linearity vs tuning voltage [14][15][16].…”

Section: Current-controlled Oscillatormentioning

confidence: 99%

Design of area-efficient GHz range current mode frequency synthesizer using standard CMOS technology

Zheng

Wang

et al. 2019

Journal of Electrical Engineering

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In this paper, an area and power efficient current mode frequency synthesizer for system-on-chip (SoC) is proposed. A current-mode transformer loop filter suitable for low supply voltage is implemented to remove the need of a large capacitor in the loop filter, and a current controlled oscillator with additional voltage based frequency tuning mechanism is designed with an active inductor. The proposed design is further integrated with a fully programmable frequency divider to maintain a good balance among output frequency operating range, power consumption as well as silicon area. A test chip is implemented in a standard 0.13 µm CMOS technology, measurement result demonstrates that the proposed design has a working range from 916 MHz to 1.1 l GHz and occupies a silicon area of 0.25 mm2 while consuming 8.4 mW from a 1.2 V supply.

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“…Therefore, how to extend the linear tuning voltage range and enhance the oscillation frequency without dissipating additional power are critical design issues. In previous works, many researchers have focused on low power consumption in two stage ring VCOs [19,20,21,22] and others focused on linearly or wide frequency tuning range of ring VCOs [23,24,25,26,27,28]. The authors of [19,20] designed the ring VCOs with low supply voltage to reduce power dissipation.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the bulk tuning technique in [20] required special process and it would lead latch-up problem with standard supply voltage. In [23,24,25], multiple varactors or voltage to current converter was employed to obtain constant voltage to frequency gain. However, these methods dissipate more current with generating same frequency.…”

Section: Introductionmentioning

confidence: 99%

A low power wide tuning range two stage ring VCO with frequency enhancing

Yan¹,

Wu²,

Hu³

et al. 2019

IEICE Electron. Express

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A wide tuning range frequency enhanced two stage ring voltage controlled oscillator (VCO) is proposed in this letter. The proposed delay cell increases the transmission gain by inserting a resistor between input and output, which consumes lower power to generate same oscillating frequency. A rail-to-rail effective voltage tuning range is obtained by both tuning of tail current and the strength of cross coupled latch. It is important for advanced process, which has low standard supply voltage and high threshold voltage. The proposed VCO is fabricated in TSMC 40 nm CMOS technology. The measured phase noise of proposed VCO is −98.05 dBc/Hz at 1 MHz offset with 1.38 GHz carrier frequency while consuming 1.1 mW from a 1.1 V standard supply. The figure of merit (FoM) is 160.4 dBc/Hz.

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A linearized tuning varactor for voltage controlled oscillator

Cited by 4 publications

References 10 publications

A linear dual-control-voltage K-band VCO with a Gilbert frequency multiplier

A linear dual-control-voltage K-band VCO with a Gilbert frequency multiplier

Design of area-efficient GHz range current mode frequency synthesizer using standard CMOS technology

A low power wide tuning range two stage ring VCO with frequency enhancing

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