Phase-locked loop frequency synthesizer with digital coarse tuning loop
Title：
Phase-locked loop frequency synthesizer with digital coarse tuning loop
Application Number：
 02125270
Application Date：
 2002/07/22
Announcement Date：
 2003/01/01
Pub. Date：
Publication Number：
 1388649
Announcement Number：
 1169299
Grant Date：
 2004-9-29
Granted Pub. Date：
 2004-9-29
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 H03L 7/187
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Li Yongming, Zhao Guoguang
Key Words：
 Phase-locked, loop frequency, synthesizer, digital coarse tuning, loop
Abstract：
 The present invention belongs to the field of frequency synthesizer design in radio transceiver and relates to phase-locked loop frequency synthesizer with digital coarse tuning loop. The frequency synthesizer includes a phase-locked loop comprising phase discriminator, loop filter, voltage-controlled vibrator and N frequency divider and a coarse tuning loop comprising the voltage-controlled vibrator, the N frequency divider and digital coarse tuning module. The present invention uses one groups of fixed capacitors to constitute partial variable capacitor and controls the amount of the resonant capacitance digital to tune the VCO output frequency. The present invention can compensate the manufacture error of integrated inductors and variable capacitor tube in chip, reduce the frequency synthesizing locking time, reduce VCO phase noise, reduce the capacitance in loop filter.
Claim：
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PCT：
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