Circuit and method of sampling an analog signal

Details Circuit and method of sampling an analog signal Circuit and method of sampling an analog signal

1995-07-03

1996-11-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 91, 327 94, 327 95, 327 96, 327494, G11C 2702, H03K 1776

Patent

active

055721540

ABSTRACT:
A sample circuit (10) maintains linear operation over frequency. A switchable diode bridge (12) passes the analog input signal when enabled to one terminal of a sample storage capacitor (14). The second terminal of the capacitor is coupled through a closed FET switch (16) to a reference node (18). Once the analog input signal is stored across the capacitor, the FET switch opens before the diode bridge disables. When the second terminal of the capacitor floats and prevents any further charge from altering the sample voltage across the capacitor. When the diode bridge is disabled, the sample voltage across the capacitor does not change. The sample voltage may be amplified and digitized for further processing in the cellular system.

REFERENCES:
patent: 5187390 (1993-02-01), Scott, III
patent: 5281867 (1994-01-01), Camphbell et al.

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