Operational amplifier with self contained sample and hold and au

Details Operational amplifier with self contained sample and hold and au Operational amplifier with self contained sample and hold and au

1991-07-05

1993-11-02

Sikes, William L.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307494, 328151, 330 9, G11C 2702, H03F 102

Patent

active

052586642

ABSTRACT:
The switched capacitor amplifier circuit of the present invention employs a single amplifier with a built-in sample and hold and input auto zero. The built-in sample and hold of the present invention provides a continuously valid output in a multi-phase system. The present invention comprises a new auto zero configuration and a new amplifier. The new amplifier is referred to as the AZAMP. The circuit configuration of the AZAMP of the present invention comprises a two stage amplifier with switches added to the circuitry to provide the sample and hold function. By disconnecting the second stage during the hold mode, the output voltage will remain unchanged due to the voltage stored on a capacitor within the AZAMP. Charge cancelling circuitry is coupled to the sample and hold circuitry to cancel the charge injected onto said capacitor when the switch is turned off. The AZAMP of the present invention also has a self-contained auto zero function. The resulting benefits are reduced area consumption and low input equivalent offset.

REFERENCES:
patent: 4439693 (1984-03-01), Lucas et al.
patent: 4565971 (1986-01-01), Brookshire
patent: 4806790 (1989-02-01), Sone
patent: 4806875 (1989-02-01), Schaffer
patent: 4833345 (1989-05-01), Miller
patent: 4962325 (1990-10-01), Miller et al.
patent: 5124663 (1992-06-01), McEntarfer et al.
patent: 5142238 (1992-08-01), White

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