Sample and hold circuitry and methods

Details Sample and hold circuitry and methods Sample and hold circuitry and methods

1991-06-11

1992-12-08

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307491, 307576, H03K 17687, G11C 2702

Patent

active

051700751

ABSTRACT:
A sample and hold circuit (24) is provided which includes an input terminal (36) for receiving a time varying input voltage. A first capacitor (14) maintains a first voltage corresponding to a sample of said time varying input voltage. A switch (12) having a control terminal (20) is operable to sample the input voltage by coupling input terminal (36) to first capacitor (14) in response to a sampling signal provided at control terminal (20). At least one second capacitor (58, 86) is provided for maintaining a preselected voltage. Circuitry (40, 42, 68, 106) is provided for selectively applying the sampling signal to control terminal (20) of switch (12) by impressing at least the preselected voltage maintained by second capacitor (58, 86) on control terminal (20).

REFERENCES:
patent: 3764921 (1973-10-01), Huard
patent: 4158149 (1979-06-01), Otofuji
patent: 4323796 (1982-04-01), Lathrope
patent: 4529897 (1985-07-01), Suzuki et al.
patent: 4922130 (1990-05-01), Swerlein
patent: 5008729 (1991-04-01), Wills et al.

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