Circuits: Opвђ“amp Circuits Manual. Including Ota

In most practical OTA ICs like the or LM13700 , the transconductance is directly proportional to the bias current:

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

: OTAs are used to create filters where the cutoff frequency is electronically tunable. This is common in music synthesizers and communication gear. Op–Amp Circuits Manual. Including OTA Circuits

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

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 In most practical OTA ICs like the or

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

: 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 Iout=gm×(Vin+−Vin−)cap I sub o u t end-sub equals

: 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 .