Browse Prior Art Database

Latching Analog Comparator Circuit

IP.com Disclosure Number: IPCOM000043080D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Myers, WV: AUTHOR

Abstract

The illustrated circuit enables the detection of a threshold crossing by an input signal with high speed, accuracy and sensitivity without the high frequency oscillation normally associated with high speed analog comparators. The solution to the comparator oscillation problem is achieved by disabling the comparator as soon as the threshold crossing is detected. With the flip-flop 3 in the reset state and "+ RESET" low, the flip-flop is triggered by the first rising edge from the comparator 4, which then disables the comparator to inhibit oscillation. The latched state is held until the system has had time to respond to the data and then reset the latch or until it is desired to reset the latch to detect further threshold crossings.

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Latching Analog Comparator Circuit

The illustrated circuit enables the detection of a threshold crossing by an input signal with high speed, accuracy and sensitivity without the high frequency oscillation normally associated with high speed analog comparators. The solution to the comparator oscillation problem is achieved by disabling the comparator as soon as the threshold crossing is detected. With the flip-flop 3 in the reset state and "+ RESET" low, the flip-flop is triggered by the first rising edge from the comparator 4, which then disables the comparator to inhibit oscillation. The latched state is held until the system has had time to respond to the data and then reset the latch or until it is desired to reset the latch to detect further threshold crossings. When implemented using appropriate components, a very fast and accurate latching comparator results with complete freedom from comparator oscillation.

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