Phase-locked loop with conditioned charge pump output

Details Phase-locked loop with conditioned charge pump output Phase-locked loop with conditioned charge pump output

2007-11-06

2007-11-06

Parker, Kenneth (Department: 2815)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S016000, C331S018000, C331S055000, C331S185000

Reexamination Certificate

active

11233548

ABSTRACT:
A phase-locked loop system configured to cause an output signal to tend toward a desired output frequency. The phase-locked loop system includes a charge pump system configured to produce a charge pump output based on differences detected between the output signal and the desired output frequency. The phase-locked loop system also includes an oscillator operatively coupled with the charge pump system and configured to produce the output signal based on the charge pump output. The charge pump system is configured to selectively effect proportional control over the output signal by applying correcting pulses along a proportional control path of the phase-locked loop system. The charge pump system includes a correction circuit having multiple stages configured to receive the correcting pulses and produce a plurality of smaller correcting pulses to reduce jitter in the output signal, the multiple stages being configured so that at least some of the multiple stages have staggered duty cycles and thereby have different instantaneous stored voltages, and where, during operation, the different instantaneous stored voltages each affect operation of the oscillator.

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