TL;DR
This paper analyzes how thermal noise affects the output SNR of common emitter amplifiers and demonstrates that a first-order Butterworth filter optimally enhances SNR compared to higher-order filters.
Contribution
It introduces a formula for selecting the cutoff frequency of analog filters to maximize SNR improvement in CEAs, highlighting the superiority of first-order Butterworth filters.
Findings
First-order Butterworth filter significantly improves output SNR.
Higher order filters are less effective in SNR enhancement.
The proposed cutoff frequency formula aids optimal filter design.
Abstract
In this paper we investigate the effects of the thermal noise of the base resistance of common emitter amplifier (CEA) on the output SNR, and we show that a first order Butterworth filter at the output of the CEA significantly improves output SNR significantly and supress the performances of higher order Butterworth, Chebyshev I, II and elliptic filters. We propose a formula for the selection of cut-off frequency of analog filters for given orders to achieve significant SNR improvement at CEA output. Considering the filter complexity and output SNR improvement, we can conclude that the first order Butterworth filter outperforms Chebyshev I, II and elliptic filters.
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