gm≈19.2×IABCg sub m is approximately equal to 19.2 cross cap I sub cap A cap B cap C end-sub (at room temperature) 3. Explore Practical Applications
to zero, OTAs function as excellent electronic switches or gated amplifiers.
: OTAs feature an additional terminal for amplifier bias current ( IABCcap I sub cap A cap B cap C end-sub Op–Amp Circuits Manual. Including OTA Circuits
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
In most practical OTA ICs like the or LM13700 , the transconductance is directly proportional to the bias current: gm≈19
R.M. Marston's Op-Amp Circuits Manual highlights several specialized roles for the OTA that are difficult to achieve with standard op-amps: : By varying the IABCcap I sub cap A cap B cap C end-sub
: An OTA can simulate a resistor whose value is determined by the bias current, allowing for digital or analog control of resistance in a circuit. Understanding Operational Transconductance Amplifiers | PDF Op–Amp Circuits Manual. Including OTA Circuits
). This terminal allows the user to electronically adjust the amplifier's transconductance ( ), effectively providing a way to program the gain.