Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Having specific delay in producing output waveform
Patent
1997-07-31
1999-07-13
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Having specific delay in producing output waveform
327263, 327284, H03K 513
Patent
active
059231971
ABSTRACT:
A delay line formed by a set of series-connected logic gates produces a sequence of output pulses in delayed response to a sequence of input pulses. The delay provided by a delay line changes with the frequency of its input pulse sequence because of temperature change in the gates due to changing power usage. Therefore a pulse stuffing circuit is provided to monitor the sequence of input pulses supplied to the delay line and to generate one or more stuff pulses when a period between successive input pulses exceeds a target maximum period. Each stuff pulse is sent as an additional input pulse to the delay circuit to decrease the period between input signal pulses. Although the delay circuit adds extra pulses to its output pulse sequence in response to the stuff pulses, the pulse stuffing circuit includes a gating circuit for removing those extra pulses from the output pulse sequence.
REFERENCES:
patent: 5170417 (1992-12-01), Winter
patent: 5532632 (1996-07-01), Kent
Credence Systems Corporation
Cunningham Terry D.
Shin Eunja
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