Title:
【発明の名称】集積回路テスタ用の負荷回路
Document Type and Number:
Japanese Patent JP2001514390
Kind Code:
A
Abstract:
An apparatus for producing an output current having a magnitude that is controlled by input data, the apparatus comprising: a digital-to-analog converter (DAC) (84) for receiving said input data and producing an output voltage of magnitude controlled by said input data; means (71) for receiving and dividing the DAC output voltage to produce a reference voltage; a first transistor (74) having a base, an emitter and a collector and producing a feedback voltage at its emitter; a second transistor (76) having a base an emitter and a collector; an operational amplifier (70) for amplifying a difference between said reference voltage and said feedback voltage to supply a control voltage in common to the bases of said first and second transistors and to the collector of said first transistor; and means (78, 80, 81) for drawing a constant reference current from the emitter of said first transistor such that said second transistor produces said output current in its collector.
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Inventors:
Gillette Garry
Application Number:
JP2000508016A
Publication Date:
September 11, 2001
Filing Date:
August 20, 1998
Export Citation:
Assignee:
Creedance Systems Corporation
International Classes:
G01R31/28; G01R31/30; G01R31/319; (IPC1-7): G01R31/28
Attorney, Agent or Firm:
Kunio Yamaguchi (1 person outside)