Phase-and-frequency mode/phase mode detector with the same gain

Details Phase-and-frequency mode/phase mode detector with the same gain Phase-and-frequency mode/phase mode detector with the same gain

1992-10-16

1994-04-26

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 25, 307527, 307528, 328133, 360 51, H03L 7087, H03D 1300

Patent

active

053070283

ABSTRACT:
A dual-mode detector which has phase-detection and phase-and-frequency-detection modes of operation, each mode of operation having the same gain. The detector includes a detection and feedback circuit for detecting phase and frequency differences, and for generating first and second feedback signals for controlling the voltage-controlled oscillator in response to the phase and frequency differences. A mode-switching circuit switches the detection and feedback circuit between the phase-detection and the phase-and-frequency-detection modes of operation. A programmable delay circuit delays signals from the mode-switching circuit and provides delayed signals to the detection and feedback circuit. Finally, an optional edge detection circuit converts predetermined data signals to a format recognizable by the detection and feedback circuit.

REFERENCES:
patent: 4894734 (1990-01-01), Fischler et al.
patent: 5162746 (1992-11-01), Ghoshal
patent: 5170297 (1992-12-01), Wahler et al.
"Phaselock Techniques", by Floyd M. Gardner, John Wiley & Sons, 1979.
"Phase-Locked Loops-Theory, Design & Applications", by Dr. Roland E. Best, Mc Graw-Hill, 1984.

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