- #1
BillyBobjoe said:
A PMOS diff amp (PMOS differential amplifier) is a type of electronic circuit that amplifies the difference between two input signals. It is composed of PMOS transistors and is commonly used in analog circuits such as operational amplifiers and audio amplifiers.
A PMOS diff amp works by using PMOS transistors in a differential pair configuration. The two input signals are applied to the gates of the transistors, and the amplified output is taken from the drains. The difference between the two input signals is amplified, while any common mode signals (signals that are present on both inputs) are rejected.
The common mode input range of a PMOS diff amp refers to the range of input voltages that can be applied to both inputs while still maintaining proper operation. It is typically specified as a minimum and maximum voltage range, and signals outside of this range may result in distorted or incorrect output.
The common mode input range is important because it determines the range of input signals that a PMOS diff amp can effectively amplify. If the input signals fall outside of the common mode input range, the output may be distorted or incorrect. It is therefore important to choose a PMOS diff amp with a common mode input range that suits the desired input signal range.
The common mode input range of a PMOS diff amp can be extended by using external components such as resistors, capacitors, and diodes. These components can be used to bias the input signals and shift them to fall within the common mode input range of the amplifier. Alternatively, a different PMOS diff amp with a wider common mode input range can be chosen.
