Abstract
We consider in this paper the derivation of input equivalent noise voltages and currents for both feedback and nonfeedback amplifier configurations. In the case of feedback amplifiers, a greatly simplified, approximate analysis is utilised and the accuracy of the approximation established. For low-noise amplifiers, a systematic design approach based on input equivalent noise sources is outlined. The relationship between the dual-input equivalent noise voltage and current sources is also established and a design example presented.
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