Font Size: a A A

The design of a precision current mirror using a high-gain current amplifier

Posted on:2009-08-14Degree:M.SType:Thesis
University:The University of Texas at ArlingtonCandidate:Pua, Mei-PingFull Text:PDF
GTID:2448390005957897Subject:Engineering
Abstract/Summary:
An improved high gain, precision, low sensitivity current mirror is designed around a feedback circuit. This mirror utilizes a buffered Widlar current mirror to drive the constant input reference current, two beta helpers to compensate for the loss of base current and an active load, and a feedback loop in the amplifier. This design provides a comparison node for detecting the input error signal. The output collector current is substantially equal to the input reference current when driving multiple transistor loads. The circuit has been fabricated with National's VIP10 process, which caters to the high gain bipolar technology. Measurement results obtained are a good reflection of the precision and low sensitivity to indicate a substantial agreement to the simulated results.
Keywords/Search Tags:Current, Precision
Related items