Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1987-05-11
1989-01-10
Wan, Gene
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 25, H03L 706
Patent
active
047976357
ABSTRACT:
A tracking loop having an enhanced ability to acquire a carrier signal and to remain locked on the carrier signal when the carrier frequency changes. The loop includes a nonlinear amplitude filter between the phase detector and the loop filter. The nonlinear amplitude filter receives the error signal e produced by the phase detector, and produces a modified error signal N for input to the loop filter. The nonlinear amplitude filter is designed such that N is an odd function of e, such that the derivative of N with respect to e is a constant k for comparatively small values of e, and such that the magnitude of N is greater than the product of k times the magnitude of e for relatively large values of e.
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Mis David
The Boeing Company
Wan Gene
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