Method and apparatus for internally trimming output drivers and terminations in semiconductor devices

DC
  • US 7,124,325 B2
  • Filed: 10/07/2003
  • Issued: 10/17/2006
  • Est. Priority Date: 10/07/2002
  • Status: Active Grant
First Claim
Patent Images

1. A method for trimming interface devices, which comprises:

  • providing a semiconductor device having a plurality of interface devices and providing each one of the plurality of interface devices with a settable control element;

    providing a test apparatus having a current source;

    connecting the current source in the test apparatus to an interface connection on the semiconductor device, the interface connection being connected to one of the plurality of interface devices;

    controlling a measurement current produced by the current source and setting the control element of the one of the plurality of interface devices to an initial value;

    providing a trimming unit in the semiconductor device;

    using the trimming unit to acquire a measurement voltage produced by the measurement current in the one of the plurality of interface devices;

    using the trimming unit to compare the measurement voltage with a nominal voltage;

    based on a difference between the measurement voltage and the nominal voltage, setting the control element of the one of the plurality of interface devices to a trimming value at which the measurement voltage matches the nominal voltage; and

    acquiring the trimming value for the control element of the one of the plurality of interface devices.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×