Impedance matching circuit, input-output circuit and...

Details Impedance matching circuit, input-output circuit and... Impedance matching circuit, input-output circuit and...

2008-01-08

2008-01-08

Le, Don (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S030000

Reexamination Certificate

active

07317336

ABSTRACT:
A characteristic test of a DUT having a low transmission line driving capability can be performed with a simple configuration and low cost. An impedance matching circuit is connected between a transmission line and a DUT in an input-output circuit of a semiconductor test apparatus. The impedance matching circuit includes: a resistance; an analog computing unit which multiplies a voltage from one end of the resistance by a predetermined number, subtracts a voltage from the other end of the resistance from the voltage multiplied by the predetermined number and outputs a resultant voltage; and a buffer which outputs a signal from the analog computing unit with low impedance. The impedance matching circuit produces an output signal from the DUT with low impedance, thereby sufficiently driving the transmission line.

REFERENCES:
patent: 6424175 (2002-07-01), Vangal et al.
patent: 6690191 (2004-02-01), Wu et al.
patent: 6992501 (2006-01-01), Rapport
patent: WO 2003/008985 (2003-01-01), None

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