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Definition of "Differential Amplifier" |
A circuit that amplifies the difference between two input signals. The example circuit is an Op-Amp configured as a Differential Amplifier, producing an output [Vout] which is the difference between inputs [V1 and V2]. / an amplifier intended to respond only to the difference between its input voltages, while rejecting any signal common to both inputs. The differential amplifier is designed such that the difference between the two inputs is amplified (high differential gain), while the signals appearing at either individual input (referenced to ground potential) sees a very low gain (low common-mode gain, usually loss). The differential amplifier is usually used as the first component at the receiving end of a communications link using twisted pair cable (either shielded or unshielded) as the transmission medium. This provides a method to reject any common-mode noise induced onto the twisted pair transmission line, including common-mode noise falling within the useful bandwidth of the communications link. The figure of merit for the differential amplifier is its common mode rejection ratio (CMRR), computed by dividing the differential-mode gain by the commonmode gain. |
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