DIFFERENTIAL AMPLIFIER Meaning and
Definition
-
A differential amplifier is an electronic device or circuit that amplifies the difference between two input signals while rejecting any common-mode signals present in those inputs. It is primarily used in applications where low noise, high gain, and precise signal amplification are required.
In a differential amplifier, the two input signals, commonly referred to as the non-inverting and inverting inputs, are compared to each other. The output is then determined by the difference in voltage between these two inputs. The amplifier amplifies this difference while attenuating any signals that are present at both inputs equally, known as common-mode signals. This rejection of common-mode signals helps in minimizing the impact of unwanted noise and interference on the output signal.
The differential amplifier is widely used in many applications, including audio systems, data acquisition systems, medical equipment, and communication systems. It is particularly useful in applications where accurate measurements of small signals or precise control of signals are required. The gain of the differential amplifier can be adjusted by varying the feedback resistors or by controlling the current flowing through the amplifier circuit.
Overall, the differential amplifier is a crucial component in electronics and plays a vital role in amplifying and processing signals accurately while reducing noise and interference.
Etymology of DIFFERENTIAL AMPLIFIER
The word "differential" in "differential amplifier" comes from the mathematical concept of a differential equation, which deals with the change or difference between two variables. In the case of a differential amplifier, it refers to the ability of the amplifier to amplify the difference between two input signals.
The word "amplifier" comes from the Latin word "amplificare", which means "to enlarge" or "to increase". In the context of electronics, an amplifier is a device that increases the amplitude (strength) of a signal.
Therefore, the term "differential amplifier" refers to an electronic device that amplifies the difference between two input signals, and can be traced back to the mathematical concept of a differential equation and the general idea of amplification.
