The is a specialized version of the operational amplifier where the output is a current proportional to the differential input voltage . Unlike standard op-amps that act as voltage-controlled voltage sources (VCVS), the OTA acts as a voltage-controlled current source (VCCS) . 1. Distinguish between standard Op-Amps and OTAs
Iout=gm×(Vin+−Vin−)cap I sub o u t end-sub equals g sub m cross open paren cap V sub i n end-sub raised to the positive power minus cap V sub i n end-sub raised to the negative power close paren Op–Amp Circuits Manual. Including OTA Circuits
: Because the output can be "turned off" by setting IABCcap I sub cap A cap B cap C end-sub The is a specialized version of the operational
In most practical OTA ICs like the or LM13700 , the transconductance is directly proportional to the bias current: Op–Amp Circuits Manual. Including OTA Circuits