A Wide-tuning-range VCO with Small VCO-gain Fluctuation for Multi-band W-CDMA RFIC

Nakamura, Takahiro; Masuda, Takatsugu; Shiramizu, Nobuhiro; Washio, Katsuyoshi; Kitamura, Takashi; Hayashi, Norio

doi:10.1109/esscir.2006.307477

Cited by 17 publications

(14 citation statements)

References 4 publications

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“…The measured phase-noise is -I2IdBc/Hz at I-MHz offset frequency. A figure of merit (FOM) is used to compare whole performances with those of other references [2, [5][6][7][8][9]. The expression for the figure of merit is written in Eqn.(2), where L {fm} is the phase noise at the offset frequency fm from the carrier f o and P DC is the consumed DC power.…”

Section: Measure Results and Discussionmentioning

confidence: 99%

A 1.2V low-power CMOS voltage-controlled oscillator (VCO) using current-reused configuration with balanced resistors for IEEE 802.16e

Wang

Yen

Yeh

et al. 2008

2008 9th International Conference on Solid-State and Integrated-Circuit Technology

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In this paper, a 1.2V low-power CMOS current-reused voltage-controlled oscillator (VCO) for IEEE 802.16e is presented. Two drain resistors are used to improve magnitude symmetry of output signals. The design is based on the TSMC O.18J1m mixed signal/RF process. The output frequencies range from 2.39GHz to 2.21GHz with the controlled voltage from OV to 1.2V. The measured output power is -4.2dBm and phase-noise is -121 dBc/Hz at I-MHz offset frequency. The power consumption of the VCO with buffer included is only 3.96mW at 1.2V voltage supply.

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Section: Measure Results and Discussionmentioning

confidence: 99%

A 1.2V low-power CMOS voltage-controlled oscillator (VCO) using current-reused configuration with balanced resistors for IEEE 802.16e

Wang

Yen

Yeh

et al. 2008

2008 9th International Conference on Solid-State and Integrated-Circuit Technology

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“…Several techniques have been previously reported to reduce fluctuation [10], [11]. In [10], an additional serial -tank with a variable inductor configuration is used to offset the VCO gain variation; however, such a method requires extra inductors and consumes more die area. A switched varactor array in combination with a multibias scheme is used to compensate the variation in [11].…”

Section: A Wideband Vco With Constant Vco Gain and Band Stepmentioning

confidence: 99%

An 18-mW 1.175–2-GHz Frequency Synthesizer With Constant Bandwidth for DVB-T Tuners

Lü

Chen

Lei

et al. 2009

IEEE Trans. Microwave Theory Techn.

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A fully integrated 1.175-2-GHz differentially tuned frequency synthesizer aimed for digital video broadcasting-terrestrial tuners is implemented in a 0.18-m CMOS process. To maintain phase-noise optimization and loop stability over the entire output frequency range, techniques of constant loop bandwidth are proposed. The voltage-controlled oscillator gain VCO and band step res are both maintained by simultaneously adjusting the sizes of switched capacitors and varactors. Charge pump current CP is programmed to compensate the variation of the division ratio . The measured results show an in-band phase noise of 97.6 dBc Hz at a 10-kHz offset and an integrated phase error of 0.63 from 100 Hz to 10 MHz. The measured variations of VCO and res are less than 12.5% and 4.5%, respectively. The variations of the measured phase noise at 10-kHz and 1-MHz frequency offsets are less than 1 dB. The measured 3-dB closed-loop bandwidth is 110 kHz and the variation is less than 9%. The chip draws 10-mA current from a 1.8-V supply while occupying a 2.2-mm 2 die area. Index Terms-Frequency synthesizer, loop bandwidth, loop gain, phase noise, voltage-controlled oscillator (VCO) gain, wideband.

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“…In [4] the use of an additional serial LC−tank with variable inductor configuration is proposed to reduce ΔK V CO . Due to the additional LC−tank this solution consumes large power and die area.…”

Section: Related Workmentioning

confidence: 99%

A 90nm, low power VCO with reduced KVCO and sub-band spacing variation

Collins

Keady

Szczepkowski

et al. 2011

2011 IEEE 9th International New Circuits and Systems Conference

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Abstract-In this paper we present the design of a low power VCO with reduced variations in VCO gain (KV CO) and subband spacing resolution (fres). The proposed VCO is designed using a 90nm CMOS process to cover a tuning range of 23%. Variations in KV CO and fres are reduced by factors of 6 and 17 respectively over a conventional sub-banded VCO, designed using the same process, to meet the same tuning range. This makes the proposed VCO more suited to stable PLL operation with its reduced KV CO requirements resulting in an improvement in phase noise performance over the conventional VCO by 2 dB. Due to the reduced loading on the VCO tank achieved by the presented design, power consumption is kept extremely low at 850 μW from a 1 V supply.

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A Wide-tuning-range VCO with Small VCO-gain Fluctuation for Multi-band W-CDMA RFIC

Cited by 17 publications

References 4 publications

A 1.2V low-power CMOS voltage-controlled oscillator (VCO) using current-reused configuration with balanced resistors for IEEE 802.16e

A 1.2V low-power CMOS voltage-controlled oscillator (VCO) using current-reused configuration with balanced resistors for IEEE 802.16e

An 18-mW 1.175–2-GHz Frequency Synthesizer With Constant Bandwidth for DVB-T Tuners

A 90nm, low power VCO with reduced KVCO and sub-band spacing variation

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