Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1988-10-12
1989-08-29
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
307352, 328151, 324 77A, G01R 2302
Patent
active
048620734
ABSTRACT:
A repetitive wave sample suited to monolithic integrated circuit fabrication, comprising a comparator followed by a master/slave latch feeding into an integrator. The inputs of the comparator are connected to (a) an unknown repetitive waveform having a known frequency and (b) the output of the integrator, which is provided to the comparator through a feedback loop. The master/slave latch is controlled by a clock pulse having a frequency equal to the frequency of the unknown waveform. The master latch is activated on the rising edge of the clock pulse while the slave latch is activated on the falling edge of the clock pulse. The integration performed on the output of the slave latch causes the output voltage of the integrator (i.e., the output of the circuit) to approach the point being sampled on the unknown input waveform. The output voltage will eventually settle to within a preset error range of the input point being sampled.
REFERENCES:
patent: 4030840 (1977-06-01), Lawton et al.
patent: 4647795 (1987-03-01), Agoston
Burr-Brown, Corp., The Handbook of Linear IC Applications, A Waveform Digitizer for Dynamic Testing of High-Speed Data Conversion Components (1987), pp. 98-106.
Analog Devices Inc.
Tokar Michael J.
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