Edge Detection Using Delayed Feedback on Inverting Amplifier
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
An edge detector is disclosed which employs an operational amplifier having its negative input terminal connected to the input voltage source and its positive input terminal connected to ground potential. Its output terminal is connected through a feedback delay element to its negative input terminal. The waveform A is the input waveform whose rising edge and falling edge are to be detected. The waveform B is the output Vout of the amplifier, indicating the positive-going or negative-going edge which is detected by the circuit. In operation, a positive-going signal input to the amplifier is fed back through the delay element to the input so that the duration of the output signal Vout (waveform B) is equal to the delay duration of the delay element.