Current mode multiplexed sample and hold circuit

Details Current mode multiplexed sample and hold circuit Current mode multiplexed sample and hold circuit

1991-03-11

1993-01-19

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307491, 307494, H03K 1716, G11C 2702

Patent

active

051809320

ABSTRACT:
A sample and hold circuit is disclosed in which differentially coupled input stages are multiplexed to drive a common output stage. In this way, a plurality of input stages can be employed wherein the transition between sample and hold modes produces greatly reduced switching transients. The circuit has very high overall gain so that sampling accuracy is improved and a very low current input stage configuration permits the use of small hold capacitors without introducing excessive droop in the hold mode. The differential balance is completed by a dummy hold capacitor which is switched along with the hold capacitor. Both of these capacitors are switched in a virtual ground configuration. Also, disclosed are means for producing an auto zero input condition, means for adding a correlation feature for improved digital performance and means for injecting controlled offset potentials so that the sample and hold means can be employed as either a DA converter or an AD converter in either a pipelined or recirculating converter state.

REFERENCES:
patent: 3516002 (1970-06-01), Hillis
patent: 3643110 (1972-02-01), Thompson
patent: 3838346 (1974-09-01), Cox
patent: 3988689 (1976-10-01), Ochi et al.

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