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Circuits Signal Gain & Filter Gain Blocks
Circuits Signal Conditioning Operational Amplifiers (Op Amps) Low Noise Amplifiers
Circuits Signal Conditioning Operational Amplifiers (Op Amps) Low Bias Current Amplifiers

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Paralleling Amplifiers to Reduce Noise

View Full Size Image View Original Datasheet Paralleling Amplifiers to Reduce Noise

In high gain circuits noise reduction is an important consideration. Paralleling four amplifiers will reduce the total noise of the circuit by a factor of two. The output noise of each amplifier, enOUTx, is attenuated by four and summed at the output terminal. Since noise from uncorrelated sources is summed in RMS fashion the total output noise is: enOUTtotal = sqrt((enOUT1/4)^2 + (enOUT2/4)^2 + (enOUT3/4)^2 + (enOUT4/4)^2) which is sqrt(4 * (enOUTx/4)^2) = 2*enOUTx/4 or enOUTx/2. One half the noise of a single amplifier.



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