A low-noise VCO with a constant K&lt;inf&gt;VCO&lt;/inf&gt; for GSM/GPRS/EDGE applications

Lin, T.Y.; Yu, Tsung-Hsin; Dehng, Guang-Kaai

doi:10.1109/rfic.2008.4561460

Cited by 12 publications

(11 citation statements)

References 2 publications

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“…Thus, the K VCO variation could be keep relatively constant in the whole frequency range. Certainly more varactor pairs can be used to further reduce the K VCO variation [7,11], however, too many varactor pairs would weaken the quality factor of the tank and the trade-off should be drawn attention.…”

Section: Circuit Design and Analysismentioning

confidence: 99%

A dual-band CMOS LC-VCO with highly linear frequency tuning characteristics

Luo

Yebing

et al. 2015

Microelectronics Journal

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Section: Circuit Design and Analysismentioning

confidence: 99%

A dual-band CMOS LC-VCO with highly linear frequency tuning characteristics

Luo

Yebing

et al. 2015

Microelectronics Journal

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“…Highly linear VCO gain improves the noise characteristic and the stability of the phase-locked loop (PLL) system in the RFID reader. [5] By adjusting the DC bias voltage Vref1 and Vref2, it can realize mutual compensation between each nonlinear C-V tuning curve of the varactors. And the summed C-V tuning curve gets an excellent linearity.…”

Section: Design Of the Proposed Lc-vcomentioning

confidence: 99%

Design of a CMOS LC-VCO with low phase noise for UHF RFID reader

Tian

Wang

2014

2014 IEEE International Symposium on Radio-Frequency Integration Technology

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In this paper, a CMOS LC-VCO with low phase noise for UHF RFID reader is proposed. A symmetrical second-harmonic resonant filtering technology is adopted to suppress the phase noise. The proposed LC-VCO is designed in Jazz 0.18 μm SiGe BiCMOS technology. The post-simulation results show that in the whole tuning range of 1.45 GHz to 2.02 GHz, the designed VCO has an excellent phase noise of lower than -130 dBc/Hz@1 MHz and a highly linear VCO gain of 65 MHz/V.

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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.…”

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

confidence: 99%

“…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]. However, this method requires extra complicated biasing networks.…”

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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A low-noise VCO with a constant K<inf>VCO</inf> for GSM/GPRS/EDGE applications

Cited by 12 publications

References 2 publications

A dual-band CMOS LC-VCO with highly linear frequency tuning characteristics

A dual-band CMOS LC-VCO with highly linear frequency tuning characteristics

Design of a CMOS LC-VCO with low phase noise for UHF RFID reader

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

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