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| Differential
Amplifier and |
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| Common-Mode
Signals |
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| • | Noise |
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| – | Static in audio
signal |
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| – | Increases as
signal is |
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| amplified |
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| – | Common mode
signal |
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| – | Significantly
reduced |
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| by differential
amplifier |
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| vnoise |
| - |
| vin |
| + |
