Precise integrated current mirrors
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 21, 2002
Grant Date -
N/A
app pub date -
Mar 17, 2000
filing date -
Mar 17, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A high precision current control circuit (current mirror) is disclosed. As in prior current mirrors, a reference voltage is generated from the input reference current. An operational amplifier is placed between the reference diode and the bases of the controlled transistors to provide precise reproduction of the reference voltage with ample current to drive many controlled current sources or current sources with high multiplication ratios from the reference current. As compared to prior emitter follower drivers, a lower voltage threshold of operation from an external proportional control results. Lower power supply voltage is supported, since one diode drop is removed from the reference current path.
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