Low cost, high speed track and hold circuit

Details Low cost, high speed track and hold circuit Low cost, high speed track and hold circuit

1996-06-21

1998-04-07

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 96, G11C 2702

Patent

active

057368783

ABSTRACT:
A very fast circuit for tracking an input signal and holding the value for digitization comprises a holding capacitor, two charging circuits connected to either side of the capacitor and extending between a constant current generator and a supply voltage. Each charging circuit has an input transistor responsive to an analog input signal and a load including the capacitor, as well as a series switching transistor responsive to a sample signal to permit a tracking mode or forcing a hold mode. The load includes a diode to effect a low resistance during the tracking mode when the capacitor is charging and a very high resistance during the hold mode when the capacitor is discharging.

REFERENCES:
patent: 4982119 (1991-01-01), Tateishi
patent: 5039880 (1991-08-01), Astegher et al.
patent: 5047666 (1991-09-01), Astegher et al.
patent: 5081423 (1992-01-01), Koyama et al.
patent: 5148162 (1992-09-01), Crosby
patent: 5298801 (1994-03-01), Vorenkamp et al.
patent: 5510736 (1996-04-01), Van De Plassche

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