Measurement of circuit delay

Details Measurement of circuit delay Measurement of circuit delay

2005-04-05

2005-04-05

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

C324S076520, C324S765010, C327S152000, C327S269000, C365S194000

Reexamination Certificate

active

06876186

ABSTRACT:
Method and apparatus for determining delay of a circuit. A clock signal is provided to a variable delay and then to the circuit. The clock signal obtained from the circuit is provided to a data register, such as a flip-flop, as a clock input. The clock signal is provided to the flip-flop as a data input. Output of the data register is provided to a controller to incrementally adjust phase shift until the data input and clock input are substantially aligned in phase. All incremental adjustments in phase shift are counted to provide an indication of delay of the circuit.

REFERENCES:
patent: 6788594 (2004-09-01), Ware et al.
patent: 6812727 (2004-11-01), Kobayashi

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