Constant impedance sampling switch for an analog to digital conv

Details Constant impedance sampling switch for an analog to digital conv Constant impedance sampling switch for an analog to digital conv

Filed on

1994-05-20

Date issued

1996-03-19

Examiner

Tran, Toan

Patent Class

Miscellaneous active electrical nonlinear devices, circuits, and

SubClass

Specific signal discriminating without subsequent control

SubSubClass

By amplitude

Other Related Categories

327390, 327589, H03K 1716, G11C 2702

Type

Patent

Status

active

Patent number

055006124

Description

ABSTRACT:
A constant impedance sampling switch suitable for a high-frequency analog-to-digital converter, presents a substantially constant impedance to the input signal regardless of the instantaneous level of the input signal. The exemplary sampling switch employs a single metal oxide semiconductor (MOS) transistor to selectively couple the input signal to a sampling circuit. The gate signal for this transistor is generated by circuitry which is disconnected from the gate of the transistor while the transistor is in an non-conductive state. During a sampling interval, the gate signal is boot-strapped by the instantaneous potential of the input signal to render the transistor conductive. Accordingly, the potential difference between the signal being sampled and the gate potential of the transistor remains substantially constant over a relatively wide range of amplitudes for the analog input signal.

REFERENCES:
patent: 4527074 (1985-07-01), Donaldson et al.
patent: 4734599 (1988-03-01), Bohac, Jr.
patent: 5084634 (1992-01-01), Gorecki
patent: 5172019 (1992-12-01), Naylor et al.

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