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Relayless voltage measurement in automatic test equipment

  • US 6,194,910 B1
  • Filed: 06/24/1998
  • Issued: 02/27/2001
  • Est. Priority Date: 06/24/1998
  • Status: Expired due to Term
First Claim
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1. A tester including scaling circuitry for performing voltage measurements on a unit under test, the scaling circuitry comprising:

  • a measurement input coupled to the unit under test and receiving an input signal to be measured;

    a plurality of gain stages having respective inputs coupled to the measurement input and respective outputs generating respective output signals; and

    a summing circuit having a plurality of inputs coupled to the respective outputs of the plurality of gain stages and generating an output signal that varies in relation with a sum of the output signals of the plurality of gain stages, wherein at least one of the gain stages is coupled to the input via a diode, said at least one of the gain stages generating a substantially constant output responsive to a reverse-biased condition of the respective diode, and a variable output responsive to a forward-biased condition of the respective diode, said variable output varying in relation with the input signal to be measured.

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