Title :
Negative current-mirror using n-p-n transistors
Author :
Barker, W.J. ; Hart, B.L.
Author_Institution :
University of Sheffield, Department of Electronic & Electrical Engineering, Sheffield, UK
Abstract :
The interconnection of an operational amplifier and an n-p-n transistor array facilitates the design of a negative-current mirror that avoids the use of p-n-p devices. For an input current in the range 1 μA-1 mA, current transfer ratios that differ from unity by less than 0.3% are achievable. The incremental output resistance is inversely related to the operating current, and exceeds 10 MΩ at 1 mA.
Keywords :
bipolar transistor circuits; operational amplifiers; 10 M ohm output resistance; bipolar transistor circuits; incremental output resistance; n-p-n transistor array; negative current mirror;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19770227
