Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Having specific delay in producing output waveform
Patent
1996-03-15
1998-08-04
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Having specific delay in producing output waveform
327284, 327279, H03K 514, H03K 519
Patent
active
057899690
ABSTRACT:
A digital delay circuit structure includes a digital calibration circuit and a digital delayed signal generator. The digital delay circuit is automatically calibrated when a calibrate signal goes active. Once the auto-calibration process is completed, the circuit switches back to a normal delay mode operation where the digital delay circuit remains until the next transition of the calibrate signal. A calibration control circuit generates a sample gate signal which initiates a feedback signal to the input terminal delay chain circuit that causes the delay chain output signal to oscillate. A calibration counter circuit counts the oscillations and couples this information to a count decoder circuit which in turn generates a signal to select one of a plurality of taps in the delay chain circuit. The digital delay circuit automatically compensates for delay variations caused by process extremes, temperature, and average voltage changes.
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patent: 4458165 (1984-07-01), Jackson
patent: 4504749 (1985-03-01), Yoshida
patent: 5049766 (1991-09-01), Van Driest et al.
patent: 5329188 (1994-07-01), Sikkink et al.
patent: 5451894 (1995-09-01), Guo
patent: 5465076 (1995-11-01), Yamauchi et al.
Davis Barry A.
Stubban John P.
Suri Salil
Adaptec, Inc.
Callahan Timothy P.
Gunnison Forrest E.
Shin Eunja
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