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US 10,873,444 B2Granted
Frequency/phase lock detector for clock and data recovery circuits
AssigneeTexas Instruments Incorporated
InventorsAbishek Manian, Michael Gerald Vrazel
Life of this patent
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Abstract
A circuit includes a phase and frequency detector circuit to generate a first phase detect signal indicative of whether a polarity of a first clock is the same as a polarity of a second clock upon occurrence of an edge of a data signal. The second clock being 90 degrees out of phase with respect to the first clock. A lock detect circuit determines, based on the first phase detect signal, that a third clock is one of frequency and phase locked to the data signal, frequency and quadrature locked to the data signal, and not frequency locked to the data signal.
Claims5
A circuit, comprising:
- a first phase detector circuit to generate a first phase detect signal indicative of whether a first clock is early or late with respect to a data signal;
- a second phase detector circuit to generate a second phase detect signal indicative of whether a second clock is early or late with respect to the data signal, the second clock being 90 degrees out of phase with respect to the first clock;
- and
- a counter to count the second phase detect signal to generate a count value.
1 more element
Dependencies are inferred from the claim text.