Sample and hold circuit having a waveform shaping circuit

Details Sample and hold circuit having a waveform shaping circuit Sample and hold circuit having a waveform shaping circuit

1997-08-26

1999-10-05

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327170, 327437, G11C 2702

Patent

active

059630639

ABSTRACT:
A waveform shaping circuit free of error in the hold capacitor due to parasitic capacitance of the MOSFET transistor. Waveform shaping circuit 3 has a constitution that it has XSEL signal and SEL signal input to it, with XSEL signal in a stable state at either a first logic level, or a second logic level with the second logic level opposite to the first logic level; it has the logic level displayed by said SEL signal output as the OUT signal; and it has the logic level displayed by said XSEL signal output as the XOUT signal; in this waveform shaping circuit, the constitution is such that in the transient state in which said XSEL signal starts logic inversion and then said SEL signal starts logic inversion, upon detection of the start of logic inversion of said XSEL signal, a change is started in the logic level of said OUT signal and the logic level of said XOUT signal; then, upon detection of start of the logic inversion of said SEL signal, the logic level of said OUT signal and the logic level of said XOUT signal are further changed. The logic inversion of said OUT signal and the logic inversion of said XOUT signal start and complete at the same time. Consequently, there is no error in the voltage of hold capacitor C.sub.H.

REFERENCES:
patent: 4467227 (1984-08-01), Lewyn et al.
patent: 4823027 (1989-04-01), Takahashi

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