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.
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