Source measure unit having secondary feedback for eliminating transients during range changing
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United States of America Patent
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-
Jul 17, 2001
Grant Date -
N/A
app pub date -
Apr 10, 1998
filing date -
Apr 10, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A source measure unit provides a constant voltage while measuring current and provides a constant current while measuring voltage. An output stage amplifier with a primary feedback loop provides the voltage and current. A secondary feedback loop includes a sample-and-hold circuit. Switches are provided to connect the secondary feedback loop to the amplifier input and disconnect the primary feedback loop from the amplifier input. While the primary feedback loop is disconnected, voltage or current ranges can be changed without affecting the amplifier output.
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