Extended range phaselocked loop with fast response time

Details Extended range phaselocked loop with fast response time Extended range phaselocked loop with fast response time

H - Electricity

03

L

331/35

H03L 7/10 (2006.01)

Patent

CA 1295697

ABSTRACT OF THE DISCLOSURE An acquisition circuit in an improved phaselocked loop prevents cycle slipping by detecting and compensating an impending large phase difference between an independent incoming signal and a local comparison signal dependently related to a voltage controlled oscillator. A train of pulses is generated in progressively delayed phase relation with each cycle of the oscillator output signal. Additionally a threshold signal related to the independent signal is pro- duced. In response to overlap of the threshold signal and individual ones of the pulses, a phase error signal is generated which controls a commutator to select individual ones of the pulses having a predetermined delay as the comparison signal, thereby generating a correcting control signal to phaselock the oscillator at a faster rate than the linear response time of a standard loop.

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