Electronic component value trimming systems
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United States of America Patent
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-
Jul 25, 2006
Grant Date -
Jun 16, 2005
app pub date -
Oct 18, 2004
filing date -
Dec 10, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Described is a system for trimming the value of an electronic component. The system comprises: at least one trimming component, each trimming component having an associated switch for selectively connecting that trimming component to the electronic component in response to a corresponding bit in a control vector. A comparator is included for generating an output bit having a first value if a net value of the electronic component and any connected trimming components differs from a desired value. A controller connected to the switches and the comparator generates the control vector in dependence on the output of comparator, the controller comprising a shift register for sequentially receiving successive output bits from the comparator; wherein the control vector comprises the contents of the shift register and wherein a bit of said first value in control vector effects switching of the corresponding switch.
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