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If the product of input amplitude and gain exceeds the maximum design, the output amplitude will saturate or limit and produce a distorted output with a flat top at the amplitude at which the saturation occurs.

The gain contains two controls - a coarse gain and a fine gain. The coarse gain is firstly used to find the crude range and then the fine gain is altered to find the accurate value to produce the optimum peak height.

Have a go!Increase the gain controls to their maximum values to observe saturation.

Click for larger image
The ideal response of an MCA, showing ADC zero off-set and the effect of increasing the gain of the amplifier (Click for larger image)


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1999, 2000 The University of Liverpool, Department of Physics

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