Regenerating device having a phase-locked loop with loop gain compensation and offset compensation
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United States of America Patent
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Nov 20, 1990
Grant Date -
N/A
app pub date -
Nov 20, 1989
filing date -
Nov 21, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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