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Test device

  • US 10,429,878 B2
  • Filed: 01/08/2019
  • Issued: 10/01/2019
  • Est. Priority Date: 01/10/2018
  • Status: Active Grant
First Claim
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1. A test device, comprising:

  • an operational amplifier, wherein an output terminal of the operational amplifier is coupled to a negative input terminal of the operational amplifier to form a negative feedback path, the operational amplifier comprising;

    a charging circuit providing at least one charging path from an operating voltage of the operational amplifier to the output terminal of the operational amplifier; and

    a discharge circuit coupled to a common junction with the charging circuit and the common junction is coupled to the output terminal of the operational amplifier to provide at least one discharge path from the output terminal of the operational amplifier to a ground voltage, wherein the output terminal of the operational amplifier is coupled to a device under test; and

    a current replication circuit coupled to control terminals of the charging circuit and the discharge circuit and copying a current flowing through the at least one charging path and the at least one discharge path according to voltages of the control terminals of the charging circuit and the discharge circuit to output a test result signal.

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