Frequency synthesis using frequency controlled carrier modulated

Details Frequency synthesis using frequency controlled carrier modulated Frequency synthesis using frequency controlled carrier modulated

1992-10-26

1994-07-12

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 328 14, H03L 718

Patent

active

053292537

ABSTRACT:
In a frequency synthesizer, a phase detector receives an externally generated reference clock signal of a constant frequency and a feedback signal to produce an error signal, which is output through a loop filter to a voltage controlled oscillator. A direct digital synthesizer (DDS) receives the reference clock signal and externally generated phase data to produce a DDS output signal whose frequency is precisely controlled by the phase data. The DDS output signal is applied as a carrier to a differential detector where it is modulated with the output of the VCO to produce a signal corresponding to the lower sideband of the modulated carrier. The output of the differential detector is output to the phase detector as the feedback signal.

REFERENCES:
patent: 4145667 (1979-03-01), Messerschmitt
patent: 4878035 (1989-10-01), Vendely et al.
patent: 4965533 (1990-10-01), Gilmore

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