While low noise amplifier is introduced into a noisy amplifier system in series or in parallel or in a two-channel way, the noise and SNR of the noisy amplifier system is decreased and increased respectively, which is useful to the design of operational amplifier.%本文论述了在有噪声放大器的系统中,通过串联、并联或双通道等形式引入低噪声放大器,提出了放大器降低噪声和提高信噪比的方法.为运放的降噪的应用及信噪比的提高提供了有益的参考.
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