Plural phase lock loop signal regeneration circuit

Details Plural phase lock loop signal regeneration circuit Plural phase lock loop signal regeneration circuit

1982-12-22

1985-02-19

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 25, 331 47, H03L 700

Patent

active

045008515

ABSTRACT:
A signal regeneration circuit using first and second phase-locked loop (PLL) circuits each having a phase comparator, a loop filter and a voltage controlled oscillator (VCO) in which the phase of an input signal is shifted by a desired amount. The first PLL operates as an input signal frequency averaging means, and the second PLL operates to satisfy the final performance as a signal regenerative circuit based on the output of the VCO in the first PLL, thereby producing as a regenerative signal the output of the VCO in the second PLL. Thus, this signal regeneration circuit can regenerate a clear signal having no noise from an unclear input signal deeply immersed in noise.

REFERENCES:
patent: 4459560 (1984-07-01), Kurihara
30th Annual Conference of the IEEE Vehicular Technology Society, Session E-2, New Land Mobile Equipment and Systems, "Overview of an AMPS Mobile Call Processing System".

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