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Method for determining an offset value for a gain of a transmission path, transmission path with adjustable gain, and use of the transmission path

  • US 7,548,590 B2
  • Filed: 10/19/2005
  • Issued: 06/16/2009
  • Est. Priority Date: 10/22/2004
  • Status: Expired due to Fees
First Claim
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1. A method for determining an offset value for a gain of a transmission path, comprising:

  • providing a transmission path comprising a first discrete-value adjustable amplifier with a first amplifier gain step size and having a second discrete-value adjustable amplifier with a second amplifier gain step size;

    setting a first total gain factor for the transmission path by programming the first amplifier with a first gain factor and the second amplifier with a second gain factor, respectively;

    supplying a first test signal to the transmission path and ascertaining a level of a first output signal from the transmission path;

    altering the second gain factor by at least a second amplifier gain step size, and altering the first gain factor so that the total gain factor remains substantially the same as the first total gain factor;

    supplying a second test signal to the transmission path and ascertaining a level of a second output signal from the transmission path; and

    determining an offset value for the second amplifier gain by comparing the ascertained levels of the first and second output signals.

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