Digital phase lock loop

Details Digital phase lock loop Digital phase lock loop

1987-08-17

1989-04-11

LaRoche, Eugene R.

Oscillators

Relaxation oscillators

331 1A, 307511, H03K 513

Patent

active

048209937

ABSTRACT:
A digital phase lock loop includes a variable precision modular counter which adjusts the output phase by changing the counter modulus by an amount proportional to the current modulus of the counter to preserve the effectiveness of each such change over a wide range of moduli, thereby increasing the effective bandwidth of the digital phase lock loop. The digital phase lock loop is characterized by an exponential duty cycle phase adjustment which avoids spurious oscillations due to either overdamping or resonance, thus increasing loop stability.

REFERENCES:
patent: 4131856 (1978-12-01), Chapman
patent: 4538119 (1985-08-01), Ashida
patent: 4668917 (1987-05-01), Levine

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