yg2010 said:so,
V0 = Ad*Vd + Acm*Vcm
how to find Vd and Vcm?
A differential amplifier is a type of electronic amplifier that amplifies the difference between two input signals while rejecting any common-mode signals. It is commonly used in electronic circuits to amplify small signals and reject noise.
A differential amplifier consists of two input terminals and one output terminal. The two input signals are connected to the input terminals and the amplified output signal is taken from the output terminal. The amplifier compares the two input signals and amplifies the difference between them, while rejecting any signals that are common to both inputs.
The main advantage of using a differential amplifier is its ability to reject common-mode signals, which can greatly reduce noise and improve the accuracy of the amplified signal. It also has a high gain and a wide bandwidth, making it suitable for a variety of applications.
Differential amplifiers are commonly used in audio amplifiers, instrumentation amplifiers, and operational amplifiers. They are also used in communication systems, medical equipment, and sensor circuits.
When choosing a differential amplifier, factors such as the gain, input impedance, bandwidth, and noise level should be considered. The type of input signals and the required accuracy of the amplified signal should also be taken into account.