Method and apparatus for a frequency detection circuit for use i

Details Method and apparatus for a frequency detection circuit for use i Method and apparatus for a frequency detection circuit for use i

1994-12-05

1996-06-25

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

327 43, 327 2, 327 18, 327 7, 327 20, 327156, 327147, 331DIG2, H03L 7097, H03D 324

Patent

active

055303838

ABSTRACT:
A frequency lock indicator (10) comprises a first delay (14), second delay (20), first sampler (24), second sampler (28), third sampler (32), fourth sampler (34), and lock indicator (36). The first delay (14) delays a rising edge of a frequency reference (12) which clocks the first sampler (24) on a rising edge and the third sampler (32) on a falling edge. The second delay (20) delays a rising edge of a feedback signal (18) to produce a delayed feedback signal (22) which clocks the second sampler (28) on a rising edge and the fourth sampler (34) on a falling edge. The first and third samplers sample an up-pump signal (26) and the second and fourth samplers sample a down-pump signal (30). The lock indicator (36) produces a lock indication signal (38) when the sampled up-pump signal substantially equal to the sampled down-pump signal.

REFERENCES:
patent: 4128811 (1978-12-01), Englund, Jr.
patent: 4267514 (1981-05-01), Kimsey
patent: 4801896 (1989-01-01), Phillips et al.
patent: 5126690 (1992-06-01), Bui et al.
patent: 5483558 (1996-01-01), Leon et al.

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