# 12.1: Theory Overview


The gain of the OTA is a function of a programming current, $$I_{abc}$$. Since $$I_{abc}$$ may be derived from other electronic signals, complex dynamic gains are possible. Further, because the OTA tends to behave as an ideal current source (i.e., it exhibits a high output impedance), a constant voltage output is best rendered through the use of a following current-to-voltage transducer. Finally, the OTA can only tolerate fairly small input signals, so some form of input attenuation is normally used.

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