Delay circuit compensating for variations in delay time

Details Delay circuit compensating for variations in delay time Delay circuit compensating for variations in delay time

1996-03-26

1998-02-17

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

327276, 327244, 327158, H03K 513, H03K 5159

Patent

active

057195145

ABSTRACT:
A variable delay circuit is provided which automatically compensates for variations in delay time due to manufacturing variables. The construction is such that with variable delay gates (VD) of a reference delay time generation circuit (21), the delay time for one cycle of a designed reference clock signal (CK) is compensated using a phase comparison device (22) and a low pass filter (23). By arranging the reference delay time generation circuit (21) proximately to paths (121-124 and 141-144) which are weighted with the same variable delay gates (VD) as in the reference delay time generation circuit (21), the reference delay time generation circuit (21) and the paths (121-124 and 141-144) are given the same extent of variation. Hence variations in delay time can be compensated for using the same control signal CTR.

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