Low-power 2.4GHz CMOS frequency synthesizer with differentially controlled MOS varactors

Sangho Shin, Kwyro Lee, Sung Mo Kang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

A fully-differential quadrature PLL with common-mode noise immunity has been developed by using a differentially controlled Quadrature-VCO (Q-VCO) along with a differential Charge-Pump (CP). To increase the Common-Mode Rejection Ratio (CMRR) of Q-VCO, a simple bias shifting technique was used with accumulation-depletion mode MOS varactors. The measured minimum CMRR of the Q-VCO control gain is more than 30dB and the frequency tuning range is 263% around the 2.5GHz center frequency with a 3-bit capacitor bank array. To reduce the overall power consumption, an architectural optimization and an Inter-Stage impedance Matching (ISM) techniques were used in frequency divider circuits. Our frequency synthesizer was fabricated in a 1P6M 0.18μm RFCMOS process, and the measured phase noise is -112dBc/Hz at IMHz offset from the 2.458GHz output frequency while the total PLL current consumption is 8.2mA for 1.8V supply voltage.

Original languageEnglish (US)
Title of host publicationISCAS 2006
Subtitle of host publication2006 IEEE International Symposium on Circuits and Systems, Proceedings
Pages553-556
Number of pages4
StatePublished - Dec 1 2006
Externally publishedYes
EventISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems - Kos, Greece
Duration: May 21 2006May 24 2006

Other

OtherISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems
CountryGreece
CityKos
Period5/21/065/24/06

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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    Shin, S., Lee, K., & Kang, S. M. (2006). Low-power 2.4GHz CMOS frequency synthesizer with differentially controlled MOS varactors. In ISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems, Proceedings (pp. 553-556). [1692645]