Circuit and method for adjusting an offset output current for an input current amplifier

  • US 8,289,082 B2
  • Filed: 12/22/2010
  • Issued: 10/16/2012
  • Est. Priority Date: 12/23/2009
  • Status: Active Grant
First Claim
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1. A circuit comprising:

  • a current amplifier; and

    an adjusting circuit configured to correct an offset of an output current of the current amplifier, the adjusting circuit having a controlled current source and a first switching device,wherein an output of the controlled current source is connectable to the current amplifier for producing an output current of the controlled current source in the current amplifier,wherein an input of the controlled current source is connectable by the first switching device of the adjusting circuit to an output of the current amplifier to form a regulation element of a control loop,wherein the input of the controlled current source is disconnected from the output of the current amplifier by the first switching device to form a holding element,wherein the controlled current source, acting as a regulation element in the control loop, is configured to regulate the offset to a minimum by setting a current value of the output current, andwherein the controlled current source, acting as a holding element, is configured to hold the current value, associated with the minimum, of the output current.

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