A 900-MHz 2 . 5-mA CMOS Frequency Synthesizer with an Automatic SC Tuning Loop

  title={A 900-MHz 2 . 5-mA CMOS Frequency Synthesizer with an Automatic SC Tuning Loop},
  author={Tsung-Hsien Lin and William J. Kaiser},
A 900-MHz phase-locked loop frequency synthesizer implemented in a 0.6m CMOS technology is developed for the Wireless Integrated Network Sensors applications. It incorporates an automatic switched-capacitor (SC) discrete-tuning loop to extend the overall frequency tuning range to 20%, while the VCO gain ( VCO) resulting from the CMOS varactor continuous-tuning is kept low at only 20 MHz/V in order to improve the reference spurs and noise performance. This frequency synthesizer achieves a phase… CONTINUE READING
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