Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1997-08-25
1999-09-28
Ton, My-Trang Nu
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 91, G11C 2702
Patent
active
059594705
ABSTRACT:
The objective of the present invention is to provide a type of sample-and-hold circuit free of the influence of parasitic capacitors.
In the sampling state, charging/discharging are performed for hold capacitor C.sub.H1 at the sampling voltage, and, in the holding state, hold capacitor C.sub.H1 is cut off from the input voltage. Current flows through MOSFET 54 connected to hold capacitor C.sub.H1 for operation, and a voltage corresponding to the hold voltage is output. Nearly the same current flows through MOSFET 54 in the sampling state and the holding state, and the voltage variation at the terminal of MOSFET 54 in transition from the sampling state to the holding state becomes smaller. Consequently, the influence of the parasitic capacitance on the hold voltage can be reduced. As the potentials of the source terminal and the drain terminal of MOSFET 54 become nearly equal, the influence of the parasitic capacitance on the hold voltage can be further reduced. REFERENCE NUMERALS AND SYMBOLS AS SHOWN IN THE DRAWINGS 2 Sample-and-hold circuit; 54, 64 MOSFET; C.sub.H1, C.sub.H2 Hold capacitor.
REFERENCES:
patent: 3702942 (1972-11-01), Aguirre
patent: 5343089 (1994-08-01), Itakura et al.
patent: 5349245 (1994-09-01), Hughes et al.
Donaldson Richard L.
Kempler William B.
Nu Ton My-Trang
Texas Instruments Incorporated
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