OTA Design

This chapter is devoted to simplified design with operational transconductance amplifiers, or OTAs. An OTA is similar to the op-amps described in Chapter 3. However, OTAs and op-amps are not always interchangeable. For that reason, an explanation of unique characteristics found in OTAs is in order. The OTA not only includes the usual differential inputs of an op-amp, but also contains an additional control input in the form of an amplifier bias current or IABC. This control increases flexibility of the OTA for use in a wide range of applications.

The characteristics of an ideal OTA are similar to those of an ideal op-amp except that the OTA has an extremely high output impedance. Because of this difference, the output signal ...

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