Low voltage sample and hold circuit

Details Low voltage sample and hold circuit Low voltage sample and hold circuit

1997-10-17

1999-10-26

Nuton, My-Trang

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 96, G11C 2702

Patent

active

059735180

ABSTRACT:
A sampling circuit which is capable of a full ranging output when powered with very low voltage supplies, e.g., of about 1 volt. A current copier function is added to a sample and hold circuit to avoid the need for low threshold switching devices in the sampling circuit, thus avoiding output droop due to the increased leakage of low threshold devices. A pre-charge circuit is placed between the sample and hold circuit and a current storage transistor to `boost` the voltage level of the output of the sample and hold circuit above the threshold voltage of the current storage transistor. The pre-charge circuit includes an output voltage boost capacitor which is charged before the hold cycle of the sampling circuit. The level of the voltage charged onto the output voltage boost capacitor is based on the threshold voltage of the current storage transistor.

REFERENCES:
patent: 4806790 (1989-02-01), Sone
patent: 4886986 (1989-12-01), Watanabe
patent: 4893067 (1990-01-01), Bhagwat et al.
patent: 5502410 (1996-03-01), Dunn et al.
patent: 5572153 (1996-11-01), Vallancourt et al.
patent: 5644257 (1997-07-01), Kerth et al.

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