Automatic current trimming method & circuits
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United States of America Patent
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Jan 27, 2009
Grant Date -
Feb 28, 2008
app pub date -
Jul 9, 2007
filing date -
Jul 17, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
Techniques pertaining to a circuit architecture capable of controlling a current source to a predefined precision are disclosed. According to one aspect of the present invention, an automatic trimming circuit is proposed to automatically trim a current generated from a current generator or circuit in accordance with a reference current. The automatic trimming circuit includes a comparator, an ADC and a register. The comparator that may be implemented as a subtractor finds a difference between a generated current and a reference current. The difference is then digitized to an n-bit precision. A digital representation of the difference is then kept in a register and used subsequently correct or modify the generated current to produce a precisely controlled current.
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