How do operational transconductance amplifiers work?
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.
What are the applications of difference amplifier?
Applications of Differential Amplifiers. Generally, we use differential amplifier that acts as a volume control circuit. The differential operational amplifier can be used as an automatic gain control circuit. Some of the differential operational amplifier can be used for Amplitude modulation.
Which are the three characteristics of a transconductance amplifier?
The desirable characteristics of a transconductance amplifier are
- high input resistance and high output resistance.
- high input resistance and low output resistance.
- low input resistance and high output resistance.
- low input resistance and low output resistance.
What is the purpose of transconductance amplifier?
A transconductance amplifier converts an input voltage into an output current. Applications include variable frequency oscillators, variable gain amplifiers and current-controlled filters. These applications exploit the fact that the transconductance gain is a function of current flowing into the control current pin.
What is the difference between OTA and op amp?
The key difference is, that an OTA has three inputs while your OpAmp has only two. Besides the two differential input terminals that an OTA and an OpAmp share, the OTA has a third input that lets you set the gain of the amplifier by applying a current.
Which amplifier will be preferred for highest gain?
29. Which amplifier will be preferred for highest gain?…Exercise :: Analog Electronics – Section 11.
|B.||Single stage amplifier|
|D.||Depends on the circuitry|
What are the advantages of operational amplifier?
Advantages: increased circuit stability, ▪ increased input impedance, ▪ decreased output impedance, increased frequency bandwidth at constant gain.
What is the purpose of the transconductance amplifier?