G - Physics – 01 – R
Patent
G - Physics
01
R
324/33, 324/37
G01R 23/02 (2006.01) G01R 23/10 (2006.01)
Patent
CA 1278041
FREQUENCY COUNTING APPARATUS AND METHOD Field of the Invention A device and method for measuring the frequency of an input signal by measuring the number of cycles of the input signal that occur in a sample interval between successive sampling times tn. An integer counter determines an estimated integer number of input signal cycles, and fraction counters determinefractional counts by counting cycles of a clock signal during time intervals between a first measurement time before the sampling time and a second measurement time after the sampling time. A correction circuit refines the fractional counts by determining the phase relationships between the clock and input signals at each measurement time. The correction circuit includes a constant current source, a capacitor, a first switch connected between the constant current source and a reference potential, a second switch connected between the constant current source and the capacitor, and a control circuit forthe switches. The control circuit disconnects the current source from the reference potential at each measurement time, and disconnects the current sourcefrom the capacitor upon the next occurrence of a periodic characteristic of the clock signal that occurs after the measurement time. The voltage on the capacitor then provides the required phase relationship.
576305
Hulsing Rand H. II
Lee Charles K.
Hulsing Rand H. II
Lee Charles K.
Riches Mckenzie & Herbert Llp
Sundstrand Data Control Inc.
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