Dual modulus counter for use in a phase locked loop

Details Dual modulus counter for use in a phase locked loop Dual modulus counter for use in a phase locked loop

1990-09-06

1991-11-19

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 25, 377 48, 377 52, H03K 2100, H03K 718

Patent

active

050669273

ABSTRACT:
In a phase locked loop having a variable divider, a dual modulus counter is used to provide the variable divider with selection signals. The variable divider is capable of providing an overall division ratio in increments of one over a contiguous range of values. The dual modulus counter includes a counter, a comparator and logic gates which generate selection signals that allow the variable divider to divide an input signal by at least division ratios R1 and R2. A phase locked loop utilizing the dual modulus counter is particularly well suited for use in a digital frequency synthesizer.

REFERENCES:
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patent: 4316151 (1982-02-01), Ooms
patent: 4325031 (1982-04-01), Ooms et al.
patent: 4390960 (1983-06-01), Yamashita et al.
patent: 4468797 (1984-08-01), Shin
patent: 4658406 (1987-04-01), Pappas
patent: 4856032 (1989-08-01), Klekotka et al.
patent: 4891825 (1990-01-01), Hansen

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