Low input bias current circuit

Details Low input bias current circuit Low input bias current circuit

1995-11-17

1998-06-09

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361111, 330273, H02H 906

Patent

active

057644640

ABSTRACT:
A circuit and method for reducing an input bias current flowing from an external signal source coupled to an input terminal of the circuit, the circuit being coupled to an input device having a device leakage current related to a device voltage. According to a preferred embodiment, a replica voltage source provides a replica voltage equal to the device voltage. A cancellation device is coupled to the replica voltage source so that the replica voltage is applied to the cancellation device. The cancellation device is further coupled to the input terminal for providing a cancellation current equal to the device leakage current, wherein the input bias current is equal to the difference between the device leakage current and the cancellation current.

REFERENCES:
patent: 4630162 (1986-12-01), Bell et al.
patent: 5196981 (1993-03-01), Kuo
patent: 5463520 (1995-10-01), Nelson

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