Input overload protection circuit

Details Input overload protection circuit Input overload protection circuit

H - Electricity

02

H

326/13, 330/2

H02H 7/20 (2006.01) A61B 5/0424 (2006.01) H03F 1/52 (2006.01) H03F 3/45 (2006.01)

Patent

CA 1138942

ABSTRACT OF THE DISCLOSURE An input overload protection circuit particularly suited for use with a high impedance differential amplifier having two inputs is provided. The protection circuit prevents the flow of substantially all leakage currents for input signals within the linear operating range of the amplifier, and includes a first and second serial plurality of diode-action clamping means, such as diodes, connected respectively between the first and second input conductors to the amplifier input and a third conductor connected to a reference potential. Driven guard means operate to apply the voltage appearing on the respective first and second input conductors at their junction with the respective first and second clamping means to the respective first and second plurality of clamping means intermediate the respective ends thereof, thereby to substantially prevent leakage current from flowing through the clamping means from the pair of conductors.

322797

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