Compensation for Variation in Circuit Delay
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
A method for obtaining a fixed time delay between the leading edges of two pulses is described. Applications include those where the effects of temperature, power supply, loading, etc., produce an undesired variation in the delay response of a circuit to its input signal. For example, in a TV display there should be an invariant delay between the horizontal sync signal and the flyback pulse in order to maintain the proper phase with video information. However, if the deflection driver stage is in saturation, the turn-off delay will usually produce an unacceptable variation as the circuit environment changes. One technique is to avoid saturation, but this produces greater dissipation and circuit cost. The scheme described in this article will solve problems of this type. Fig. 1 illustrates the method in general.