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An amplifier can be used to adapt the range of the signal to a requirement, to make it more robust for transmission, or to satisfy interface requirement (like input/output impedance)

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CMR is "Common Mode Rejection" It is the tendancy of the device to reject the input signal common to both the inputs is called Common Mode Rejection. its Measure is called "common mode Rejection Ratio …
answered Nov 23 '11 by Gouse Shaik
5
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amplification has been achieved. Cascade Cascode: An amplifier consisting of a common emitter input stage that drives a common base output stage. advantages include high gain and low noise. Cascode Go through these links you may get an clear idea about these. …
answered Oct 27 '11 by Gouse Shaik