| 摘要 |
A differential audio amplification apparatus with common mode rejection is shown, having a first input current path (401) and a second input current path (402) with a shunting input resistance (400) therebetween. The apparatus also has a first output current path (403) and a second output current path (404) with a shunting output resistance (405) therebetween. Differential amplifiers (412, 413) are provided with feedback connecting the input paths with the output paths and providing an output signal. The output shunting resistance (405) is controlled to provide gain control while maintaining common mode rejection.
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