Differential Input and Differential Output Amplifier: In almost all the applications, the op-amp is employed with a single-ended or unbalanced output. However, there are certain applications in which a differential output is desired. The differential input and differential output amplifier is widely employed as a pre-amplifier and in driving push-pull arrangements. One possible arrangement of […]
OP-AMP with Negative Feedback
Differential Amplifier With Three OP Amp: Differential Amplifier With Three OP Amp, depicted in Fig. 34.47 consists of two stages—one formed by op-amps A1 and A2 and second by op-amp A3. Hence for determination of overall voltage gain of the circuit shown in Fig. 34.47, it becomes imperative to determine the voltage gain of each stage.
Differential Amplifier with two Op Amps: The gain as well as input resistance of the differential amplifier can be increased by using two op-amps. The characteristics of such an amplifier are identical to those of a noninverting amplifier. A practical circuit using differential amplifier with two op amp is given in Fig. 34.46. The circuit
Op Amp Differential Amplifier Circuit Diagram and its Operation: An ideal difference amplifier amplifies only the difference between two signals; it rejects any common signals to the two input terminals. For instance, a microphone system amplifies an audio signal applied to one terminal of a difference amplifier, and rejects any 50 Hz noise signal or