Phase locked loop with improved lock-in

Details Phase locked loop with improved lock-in Phase locked loop with improved lock-in

1981-03-04

1983-03-22

Pellinen, A. D.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329112, 329124, 455209, 455260, H04H 500, H03D 318

Patent

active

043777287

ABSTRACT:
The circuit determines whether an incoming frequency is within the normal "lock-in" range of a phase locked loop VCO or not, and whether it is higher or lower than the VCO frequency. If not within normal range, the beats are rectified and gated to provide a DC control voltage of the proper value and polarity for locking the oscillator on the incoming frequency. Rectification may be half or full wave as needed, and the circuit may include filter bandwidth control as well. This circuit is suitable for signals of any waveform, quadrature signals, and AM stereophonic signals.

REFERENCES:
patent: 3610954 (1971-10-01), Treadway
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4057762 (1977-11-01), Namiki
patent: 4117410 (1978-09-01), Bender
patent: 4213096 (1980-07-01), Daniel
patent: 4253180 (1981-02-01), Kimbrough
patent: 4270221 (1981-05-01), Daniel
"Color-Carrier Reference Phase Synchronization Accuracy in NTSC Color Television", Donald Richman, Proceedings of the I-R-E.
"The DC Quadricorrelator: A Two-Mode Synchronization System", Donald Richman, Proceedings of the I-R-E.

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