Frequency synthesizer apparatus incorporating phase modulation t

Details Frequency synthesizer apparatus incorporating phase modulation t Frequency synthesizer apparatus incorporating phase modulation t

1994-04-22

1995-06-13

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 17, 331 23, 332103, 332144, 375308, 455113, 455260, H03C 300

Patent

active

054246881

ABSTRACT:
In a radio transmitter, a PM input signal is provided directly to a frequency synthesizer. The synthesizer includes a PLL having a reference frequency input signal and a controlled frequency output signal. The PLL includes a frequency divider which is directly connected in a feedback circuit path between the controlled frequency output signal and the PLL's phase-detector. The frequency divider has a frequency control input signal for setting a division ratio N for the divider, and a PM circuit has as input signal the PM input signal and the frequency control input signal. The PM circuit provides an offset signal to the phase detector output, so that the PLL creates a correcting phase signal resulting from the offset signal. The magnitude of the offset signal changes as a function of the change in the value of N.

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Hand Drawn Sketch of Prior Art DDS Circuit Arrangement (with comments).

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