Current mirror with improved output impedance at low power supplies
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United States of America Patent
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N/A
Issued Date -
Aug 23, 2007
app pub date -
Feb 15, 2007
filing date -
Feb 17, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A current mirror circuit arrangement is formed to maintain a high output impedance when utilized with a relatively low voltage power supply. A common mode voltage regulator circuit is utilized in conjunction with the output branch of the current mirror to eliminate the need for an additional active device in series with the output transistor of a current mirror to control its drain voltage. The elimination of the second active device thus increases the available headroom for the output branch (i.e., adds one V.sub.DS). The increased headroom in the inventive current mirror is particularly advantageous for low voltage applications, since it is capable of maintaining the high output impedance required for accurate mirroring of the input current.
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