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Special-Purpose Op-Amp Circuits - Technical MCQs

Q1:

When using an OTA in a Schmitt-trigger configuration, the trigger points are controlled by

A the Iout

B the IBIAS

C the Vout

D both Iout and IBIAS

ANS:D - both Iout and IBIAS

The operational transconductance amplifier (OTA) is an amplifier whose differential input voltage produces an output current.

Thus, it is a voltage controlled current source (VCCS). There is usually an additional input for a current to control the amplifier's transconductance. The OTA is similar to a standard operational amplifier in that it has a high impedance differential input stage and that it may be used with negative feedback.