Measurement and analysis of BJT current mirror frequency response at low DC bias currents

Brinson, Mike and Faulkner, D. J. (1997) Measurement and analysis of BJT current mirror frequency response at low DC bias currents. International Journal of Electronics, 82 (5). pp. 515-526. ISSN 0020-7217

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Abstract / Description

The AC current transfer ratios for BJT current mirrors operating with nanoampere DC bias currents have been measured and analysed. The new measurement technique uses current-feedback topology instrumentation amplifiers to sense indirectly the input and output currents of a current mirror under test. Sample results are reported for the popular two-transistor and Wilson current mirrors. The measured frequency response data show that bipolar integrated circuit current mirrors, biased at nanoampere DC currents, have current transfer ratios in the range 0.7 to 1 with sufficient bandwidth for use in micropower circuit design. There is close agreement between measured and theoretical data. However, the results of SPICE simulation deviate at very low currents, confirming previous reports of inadequacies in the BJT model under these conditions.

Item Type: Article
Uncontrolled Keywords: single-stage differential amplifiers; series-connected diodes
Subjects: 600 Technology > 620 Engineering & allied operations
Department: School of Computing and Digital Media
Depositing User: Mike Brinson
Date Deposited: 04 Nov 2019 10:50
Last Modified: 04 Nov 2019 11:02


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