Bi-directional circuit to interface between a low current device

Details Bi-directional circuit to interface between a low current device Bi-directional circuit to interface between a low current device

1987-10-02

1989-11-07

Lall, Parshotam S.

Boots, shoes, and leggings

324 73R, 364481, 341 50, G01R 1900, H03M 500

Patent

active

048796611

ABSTRACT:
A circuit to function as an interface between larger test instrumentation having a high capacitance, including connecting leads, and a small, low current, monolithic chip device. This interface circuit has no internal control logic, is capable of transactions in both directions and is small itself, thereby fitting close to the monolithic chip device and reflecting a relatively low capacitance load to the chip.
The interface circuit includes an input buffer amplifier connected to provide a driving voltage to drive the test instrumentation in response to a voltage from the small monolithic chip device, and a sensing resistor is connected with the input buffer amplifier so that their combined equivalent resistance value is substantially equal to the resistance reflected by the test instrumentation. An operational amplifier is connected to drive a small monolithic chip device in response to a voltage across the sensing resistor that is developed by the test instrumentation.

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patent: 4574234 (1986-03-01), Inbar
patent: 4608647 (1986-08-01), White et al.
patent: 4630224 (1986-12-01), Sollman
patent: 4651088 (1987-03-01), Sawada
patent: 4686627 (1987-08-01), Donovan et al.
patent: 4694242 (1987-09-01), Peterson et al.

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