differential amplifier

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differential amplifier

An amplifier used to increase the difference between two signals, one of which is usually a reference.
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The common-mode feedback (CMFB) amplifier is implemented with transistors [M.sub.9]-[M.sub.11], which actually resembles a single-ended difference amplifier. The error measuring the difference between the IA output common-mode voltage, applied to [M.sub.10a] and [M.sub.10b], and the reference common-mode voltage ([V.sub.CM]) applied to [M.sub.10c] and [M.sub.10d], is amplified in order to drive the gates of the bias transistors [M.sub.7].
The first ADC section is a wide-band analog difference amplifier whose output goes into a 6-MHz analog low-pass filter.
The AD628 is a common-mode difference amplifier that includes programmable gain and uses an external resistor.
National Semiconductor has expanded its amplifier portfolio with three high common mode difference amplifiers. The company's linear monolithic precision (LMP[TM]) line addresses precision applications, and the LMP8270, LMP82701 and LMP8272 amplifiers address broad-based applications in industrial, medical and automotive electronics.