VARIABLE SELF-CALIBRATING DIGITAL DELAY CIRCUIT

摘要

PURPOSE: To facilitate delay adjustment by converting an electric signal into the number of pulses and comparing this number of pulses with a second number defined by a user. CONSTITUTION: The waveform of an external oscillator is inputted to a selection circuit 101 through a line 52. It is gated by two additional inputs. That is, a line 51 as the output of a scan-in shift register 103 suggests whether or not delay data inputted by a user is properly inputted to the scan-in shift register 103, and a delay enable line 53 as a second input suggests whether or not delay adjustment is requested. When both inputs reach proper logical levels, the waveform given by the external oscillator in the selection circuit 101 is inputted to a controller 102.