Regenerating device having a phase-locked loop with loop gain co

Details Regenerating device having a phase-locked loop with loop gain co Regenerating device having a phase-locked loop with loop gain co

1989-11-20

1990-11-20

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

329360, 329350, 331 14, 331 15, 331 17, H03L 7087, H03L 7093, H03D 122

Patent

active

049721631

ABSTRACT:
A regenerating device for regenerating a signal from a composite input signal, provided with a phase-locked loop comprising a first phase comparison circuit 1, a first low-pass filter 2 connected to the output thereof and a controlled oscillator 3. The control input of said oscillator 3 is connected to the output of the low-pass filter 2 while its quadrature output 3a is connected to one input of the phase comparison circuit 1. The input of the phase comparison circuit 1 forms the input of the regenerating device and the in-phase output of the oscillator 3 the output. Furthermore a second phase comparison circuit 4 and a second low-pass filter 5 connected thereto are provided, which correspond to the first phase comparison circuit and the first low-pass filter respectively. The input of the phase-locked loop and the in-phase output 3b of the controlled oscillator 3 are connected to the inputs of the phase comparison circuit 4. An AGC amplifier 7 fed back to its control input via a feedback path is connected to the output of the second low-pass filter 5. The signal fed back is fed to the control input of a gain-controllable amplifier 6 which is included in the phase-locked loop and which corresponds to the AGC amplifier 7.

REFERENCES:
patent: 3716802 (1973-02-01), Muratani et al.
patent: 4473801 (1984-09-01), Maurer et al.
patent: 4546322 (1985-10-01), Crutcher

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