Phase detector having a sampling circuit

Details Phase detector having a sampling circuit Phase detector having a sampling circuit

1997-06-24

1999-07-13

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 9, 327 43, H03D 1300

Patent

active

059231904

ABSTRACT:
A phase detector enables sampling of an input waveform such that a resolution, equivalent to the resolution conventionally obtained by doubling a clock frequency, is obtained without doubling the frequency. In order to accomplish this, the phase detector has the following construction and function. A first sampling circuit samples an input waveform using an in-phase clock signal from a clock to generate a sampled waveform. A second sampling circuit samples the input waveform by using a falling edge of the clock to generate an output a signal. A third sampling circuit samples the output signal from the second sampling circuit by a rising edge of the sampled waveform supplied from the first sampling circuit to generate a phase detection flag. This phase detection flag thus detects the presence of the input waveform at a rate double the frequency of the clock.

REFERENCES:
patent: 4675558 (1987-06-01), Serrone et al.
patent: 4959617 (1990-09-01), Martin
patent: 5126602 (1992-06-01), Lee et al.
patent: 5530383 (1996-06-01), May

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