Delay circuit having a noise reducing function

Details Delay circuit having a noise reducing function Delay circuit having a noise reducing function

1998-02-06

2000-09-19

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

327288, 327278, H03H 1126

Patent

active

061218138

ABSTRACT:
A delay circuit which resists noise present in the power supply or ground includes a waveform modification circuit for varying the rise and fall of inputted pulse signals, and a switch for connecting a power supply and an output terminal when the voltage of the modified waveform exceeds the threshold value related to the power supply voltage. The waveform modification circuit includes a voltage control circuit for varying the output voltage of the waveform modification circuit in accordance with changes in the voltage of the power supply. To reshape a waveform, an input signal is compared with the power supply voltage as a reference value, and the input signal and power supply voltage are switched in accordance with the comparison results. The voltage control circuit changes the output of the waveform modification circuit in accordance with the changes in the reference when noise contained in the power supply voltage is applied to the output of the waveform modification circuit. No malfunctions thus occur when an input signal is compared with the power supply voltage as a reference value in order to reshape a waveform.

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patent: 5459424 (1995-10-01), Hattori
patent: 5589790 (1996-12-01), Allen
patent: 5796296 (1998-08-01), Krzentz

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