A 2.4-GHz LC-tank VCO with minimum supply pushing regulation technique

Xuejin Wang, Bertan Bakkaloglu

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

4 Scopus citations

Abstract

Design of low drop-out (LDO) supply regulated 2.4GHz low phase noise LC-tank voltage controlled oscillator (VCO) is presented. Low-frequency supply noise sensitivity of the VCO phase noise is derived, and output noise and power supply rejection (PSR) profile of the LDO is optimized for minimum supply pushing. The LDO PSR and output noise is optimized by shaping the LDO AC response and tuning the equivalent-series resistance (ESR) of the bypass capacitor, while achieving maximum LDO current efficiency. To verify the results, two 2.4GHz LC-tank VCOs, with a PMOS and an NMOS switching pair respectively with associated PMOS supply regulators are designed and fabricated in a 0.18μm, 7-layer metal CMOS process. The implemented VCOs achieve less than 95dBcZHz phase noise at 100kHz offset with a current consumption of 2.2mA. By utilizing the proposed regulator AC loop shaping, the VCO phase noise sensitivity to supply noise is improved by 30dB for offset frequency up to 10MHz with no Phase noise peaking.

Original languageEnglish (US)
Title of host publicationProceedings of the 2007 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2007
Pages127-130
Number of pages4
DOIs
StatePublished - Oct 2 2007
Event2007 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2007 - Honolulu, HI, United States
Duration: Jun 3 2007Jun 5 2007

Publication series

NameDigest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
ISSN (Print)1529-2517

Other

Other2007 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2007
CountryUnited States
CityHonolulu, HI
Period6/3/076/5/07

Keywords

  • DC-DC power conversion
  • Low-dropout regulators
  • Phase noise
  • Power supply rejection
  • Voltage controlled oscillators

ASJC Scopus subject areas

  • Engineering(all)

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