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Chapter 16: Line Inputs and Outputs > 16.12 Common Mode Rejection Ratio (CMRR)

16.12  Common Mode Rejection Ratio (CMRR)

Figure 16.3 shows a balanced interconnection reduced to its bare essentials; hot and cold line outputs with source resistances Rout+, Rout− and a standard differential amplifier at the input end. The output resistances are assumed to be exactly equal, and the balanced input in the receiving equipment has two exactly equal input resistances to ground R1, R2. The ideal balanced input amplifier senses the voltage difference between the points marked IN+ (hot) and IN- (cold) and ignores any common-mode voltage which are present on both. The amount by which it discriminates is called the Common-Mode Rejection Ratio or CMRR, and is usually measured in dB. Suppose a differential voltage input between IN+ and IN– gives an output voltage of 0 dB; now reconnec....


  

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