Sample and hold circuit

Details Sample and hold circuit Sample and hold circuit

1990-03-21

1991-04-02

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307359, G11C 2702

Patent

active

050049356

ABSTRACT:
A sample and hold circuit for sampling an input signal having a variable input voltage. The circuit includes an input circuit for supplying the input signal, a holding capacitor for storing a charge voltage in response to a charge current supplied thereto when a charge voltage stored previously therein is lower than the input voltage and for producing a discharge current when the previous stored charge voltage is higher than the input voltage, a differential circuit for comparing the voltage levels of the input voltage and the charge voltage, and generating a differential current in response thereto, a current amplifier for generating the charge current in response to the differential current when the previous stored charge voltage is lower than the input voltage and for amplifying the discharge current when the previous stored charge voltage is higher than the input voltage and a switch for selectively activating and deactivating the current amplifier.

REFERENCES:
patent: 3694668 (1972-09-01), Foerster
patent: 4321488 (1982-03-01), Srivastava
patent: 4328434 (1982-05-01), Geller
patent: 4389579 (1983-06-01), Stein
T. Algra et al., "Precision Sample-and Hold Circuit Drives Output with a Current Source", Electronic Design 1, Jan. 4, 1978, p. 154.
Analysis and Design of Analog Integrated Circuits, Chap. 4, Sec 3, "Current Sources as Active Loads"; Paul R. Gray et al.; 1977.

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