Latching Analog Comparator Circuit
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
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.