Phase locked loop with d.c. modulation

Details Phase locked loop with d.c. modulation Phase locked loop with d.c. modulation

H - Electricity

03

C

H03C 3/09 (2006.01) H03L 7/193 (2006.01)

Patent

CA 2080013

A D.C. modulated phase locked oscillator (60, 80, 100, 140, 160, 190, 220, 264, or 290) includes a phase locking oscil- lator (70, 90, 128, 180, 192, 222, 266, or 292) and a D.C. modu- lator (72, 92, 130, 156, 182, 194, 224, 268, or 294). Both a for- ward path (14) and a feedback path (16) are D.C. modulated. D.C. modulation of the feed- back path (16) optionally in- cludes changing the frequency in the feedback path (16) as a function of the frequency of a modulation oscillator (64), changing the frequency in the feedback path (16) by a plurali- ty of pulses for each cycle of the modulation oscillator (64), removing pulses from the feed- back path (16), adding pulses to the feedback path (16), dividing the frequency in the feedback path (16) by higher and lower dividing ratios, preventing one cycle in the feedback path (16) from developing a "high" in the feedback path (16), holding a "high" in the feedback path (16) between two adjacent pulses, mixing quadrature frequencies with the feedback frequency in the feedback path (16), changing one input to a variable modulus divider (48) by means of a parallel adder (272), and using logic elements (148) to remove pulses from the feed- back path (16).

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