Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1991-08-07
1992-09-15
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307355, 307491, 307572, H03K 1716, H03K 17687
Patent
active
051480549
ABSTRACT:
A high-accuracy MOSFET-switched sampling circuit feeds charge feedthrough error to a load as well as to a dummy load during DC input signal sampling by a switching MOSFET, thereby reducing storage of the charge feedthrough error on the load to the extent that the charge feedthrough error is rather stored on the dummy load. During AC input signal sampling, the high-accuracy MOSFET-switched sampling circuit isolates the AC input signal from the dummy load. Charge feedthrough error produced by an isolating MOSFET that isolates the AC input signal from the dummy load is exactly compensated by a phase-opposed compensating MOSFET positioned in the DC input signal path. The dummy load and the load may be active as well as passive and may be selected to have equal and unequal electrical characteristics. The compensating current produced by the compensating MOSFET may be selected not only to exactly compensate the charge feedthrough error of the isolating MOSFET but also to compensate the charge feedthrough error of the switching MOSFET in the DC input signal path. High sampling accuracies are achieved by the instant invention in a wide variety of applications including an exemplary auto-zeroed CMOS comparator.
REFERENCES:
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patent: 4691125 (1987-09-01), Rybicki
patent: 4922130 (1990-05-01), Swerlein
C. Eichenberger and W. Guggenbuhl, "Dummy Transistor Compensation of Analog MOS Switches", IEEE Journal of Solid State Circuits vol. 24, No. 4 pp. 1143-1145 (Aug. 1989).
R. E. Suarez and P. R. Gray, "All-MOS Charge Redistribution Analog-to-Digital Conversion Techniques-Part II", IEEE Journal of Solid State Circuits vol. SC-10, pp. 379-385, (Dec. 1975).
Unitrode Corporation
Zazworsky John
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