For the γ pulse signal with large amplitude difference,if the linear amplifier is used to amplify,it needs a larger linear range and lower noise.Otherwise,it is difficult to consider the anti saturation of high energy pulse and anti noise of low energy pulse at the same time.A nonlinear amplifying circuit is developed.The pulse signal with amplitude difference of 10 times is amplified into the pulse signal of double amplitude difference by using the logarithmic volt ampere characteristic of the PN junction of triode.Under specific circumstances,the amplification of high and low energy γ signals is considered,which is convenient for subsequent signal processing.Logarithmic signal processing based on fixed threshold value pulse width by TDC is tested.The effect is good.It can reduce noise interference.
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