Current measuring circuit for measuring drive current to load
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United States of America Patent
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-
Nov 22, 2005
Grant Date -
Jul 22, 2004
app pub date -
Jun 27, 2003
filing date -
Jan 20, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
When a voltage is supplied from a voltage supply terminal to a non-inverted input terminal of an operational amplifier, a voltage equal to the supply voltage is input to an inverted input terminal and also to a voltage apply terminal for a load. When PNP transistors constituting a current mirror turn on in response to the applied voltage, a source current flows through one of the PNP transistors to the load, and a mirror current of the source current flows through the other of the PNP transistors to a current measuring terminal. The current driven to the load can be obtained by measuring the mirror current with an amperemeter.
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