Digital frequency control circuit phase control circuit and PLL

Details Digital frequency control circuit phase control circuit and PLL Digital frequency control circuit phase control circuit and PLL

1996-04-10

1998-07-07

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327150, 327151, 327160, H03L 706, H03L 708

Patent

active

057774994

ABSTRACT:
An oscillating circuit 30 outputs a signal .o slashed..sub.o whose pulse cycle T is a linear function T=kS+m of a control input value S. A frequency control circuit 10, every time a counter 11 counts a number Nr of pulses of a reference signal .o slashed..sub.r, calculates S=No-m/k, where No is a count of .o slashed..sub.o counted by the counter 12, makes a judgement on convergence of .o slashed..sub.o based upon the difference between input and output values of a register 14, makes the register 14 hold S, updates Nr=S+m/k and clears the counter 12 to 0. A digital phase control circuit 20 judges a advance/delay of the phase of .o slashed..sub.o relative to .o slashed..sub.r with a phase comparator circuit 21, decrements/increments a count with a counter circuit 22 every time a judgement on the advance/delay of the phase is made and when the result of the judgement on the advance/delay of the phase is reversed from the previous result of that, changes the count to a value that is half the number of times that the same judgement was made successively before the reversal.

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