Phase-locked loop for a directly mixing synchronous AM-receiver

Details Phase-locked loop for a directly mixing synchronous AM-receiver Phase-locked loop for a directly mixing synchronous AM-receiver

1985-11-25

1986-12-23

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 15, 331 22, 331 31, 331 32, 329 50, 329109, H03L 706, H03D 318, H03K 902

Patent

active

046314997

ABSTRACT:
A phase-locked loop is constituted by a controllable oscillator coupled through a phase detection arrangement and a low-pass filter to receive an input carrier applied to a signal input of the phase detection arrangement. In order to decrease the phase synchronization between a carrier locally generated in the loop and an input carrier, an unwanted DC offset generated during phase detection is reduced. The phase detection arrangement has first, second and third cascade-coupled mixer stages. An auxiliary mixing signal is applied from a signal generator to the first and third mixer stages. An input of one of the first and second mixer stages is coupled to the signal input of the phase detection arrangement and an input of the other of the two last-mentioned stages is coupled to an output of the controllable oscillator. The low-pass filter has a cut-off frequency lower than the fundamental frequency of the auxiliary mixing signal, and the fundamental frequency is lower than the frequency of the input carrier. The phase-locked loop is used to generate a synchronous RF carrier in a directly mixing AM receiver.

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