Opвђ“amp Circuits Manual. Including Ota Circuits -

with an external control voltage, the gain of the signal path can be modulated dynamically.

The fundamental relationship governing an OTA is defined by its transconductance, which relates the output current ( Ioutcap I sub o u t end-sub ) to the differential input voltage ( Op–Amp Circuits Manual. Including OTA Circuits

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 with an external control voltage, the gain of

In most practical OTA ICs like the or LM13700 , the transconductance is directly proportional to the bias current: while an OTA (e.g.

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

: A standard op-amp (e.g., 741) provides a voltage output with low output impedance, while an OTA (e.g., CA3080) provides a current output with high output impedance .