A fully integrated CMOS frequency synthesizer with charge-averagingcharge pump and dual-path loop filter for PCS- and cellular-CDMAwireless systems |
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| Authors: | Yido Koo Hyungki Huh Yongsik Cho Jeongwoo Lee Joonbae Park Kyeongho Lee Deog-Kyoon Jeong Wonchan Kim |
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| Affiliation: | Dept. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ.; |
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| Abstract: | A fully integrated CMOS frequency synthesizer for PCS- and cellular-CDMA systems is integrated in a 0.35-μm CMOS technology. The proposed charge-averaging charge pump scheme suppresses fractional spurs to the level of noise, and the improved architecture of the dual-path loop filter makes it possible to implement a large time constant on a chip. With current-feedback bias and coarse tuning, a voltage-controlled oscillator (VCO) enables constant power and low gain of the VCO. Power dissipation is 60 mW with a 3.0-V supply. The proposed frequency synthesizer provides 10-kHz channel spacing with phase noise of -121 dBc/Hz in the PCS band and -127 dBc/Hz in the cellular band, both at 1-MHz offset frequency |
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