What is a differential amplifier configuration?

This type of operational amplifier circuit is commonly known as a Differential Amplifier configuration and is shown below: By connecting each input in turn to 0v ground we can use superposition to solve for the output voltage Vout. Then the transfer function for a Differential Amplifier circuit is given as:

What is input common-mode range of a differential amplifier?

Input common-mode range (ICMR) The input common-mode range is the range of common-mode voltages over which the differential amplifier continues to sense and amplify the difference signal with the same gain. Typically, the ICMR is defined by the common-mode voltage range over which all MOSFETs remain in the saturation region.

How do you find the gain of a differential amplifier?

Differential Amplifier Equation. If all the resistors are all of the same ohmic value, that is: R1 = R2 = R3 = R4 then the circuit will become a Unity Gain Differential Amplifier and the voltage gain of the amplifier will be exactly one or unity.

What is the voltage output of a differential op-amp?

The voltage output from the differential op-amp A3 acting as a subtractor, is simply the difference between its two inputs ( V2 – V1 ) and which is amplified by the gain of A3 which may be one, unity, (assuming that R3 = R4).

For a fully symmetric differential pair which senses inputs by equal and opposite amounts then the concept of half circuit can be applied to find the gain of the differential amplifier. For the circuit shown in below Figure, by using the concept of half circuit, the small signal gain is given as,

What is the value of peak to peak swing differential amplifier?

The peak to peak swing differential amplifier is equal to 2 [V DD – (V GS – V TH )]. In the circuit of above Figure if V in1 and V in2 has a large common mode disturbances or unequal common mode dc level then the output response has distortions.