System for determining the time at which an analog voltage cross

Details System for determining the time at which an analog voltage cross System for determining the time at which an analog voltage cross

1993-01-21

1994-11-22

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 77, 327 63, H03K 522

Patent

active

053672038

ABSTRACT:
A system provides a uniform delay in crossovers in opposite directions of a variable input voltage relative to a reference voltage. A comparator is included for producing first and second comparison voltages in accordance with the relative magnitudes of the input and reference voltages. A clamping circuit provides first and second clamping voltages. A control circuit produces first and second control voltages dependent upon the individual occurrences of the first and second comparison voltages. The first control voltage is greater by a particular magnitude than the first clamping voltage. The second control voltage is less than the second clamping voltage by the particular magnitude. The control circuit includes an impedance connected between first and second lines for providing the first clamping voltage on the first line and the first control voltage on the second line during the production of the first comparison voltage and for providing the second clamping voltage on the second line and the second control voltage on the first line during the production of the second comparison voltage. A drive circuit produces on an output line first and second output voltages respectively related to the first and second clamping voltages. The drive circuit provides equally low delays, with a minimal loss of energy, between the production of the first output voltage and the first comparison voltage and between the production of the second output voltage and the second comparison voltage. The drive circuit includes a common output line for the first and second output voltages.

REFERENCES:
patent: 5121012 (1992-06-01), Orlov
Technical Notes, Frequency Comparator Jan. 17, 1972 pp. 1-3.

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