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放大器的电源电阻和噪声考虑因素Texas Instruments Incorporated Amplifiers: Op Amps
Source resistance and noise considerations
in amplifiers
By Jorge Vega
Characterization Engineer
Introduction Figure 1. Buffer-configured amplifiers with source
In many applications it is critical to design for low resistance attached to positive input and ground
noise. Different types of sensors, filters, and audio
designs are common examples where low noise is
critical. These applications can be modeled as a
source resistance in series with a signal source.
The source resistance has thermal noise and also
converts current noise into voltage noise, increas-
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