Current Amplifier Circuit Using Op Amp. Some op amps are not capable of this. This inverting op amp configuration is also used in various filters like active low pass or active high pass filter.
R f 0 the non inverting amplifier will become voltage follower buffer. The twin t filter topology is the only multiple op amp topology suitable for current feedback op amps. This circuit achieves its constant current through the use of the op amp and the transistor.
The output voltage of non inverting amplifier is in phase with its input voltage and it s given by.
Rf must be used instead of a short from output to inverting input of both op amps. From here the op amp has negative feed back ie the output is connected back to the input and balances the v and v terminals to approximately the same potential. R f 0 the non inverting amplifier will become voltage follower buffer. Two transistors are used in this circuit.
