Current Sensitive Preamplifier Design Used To MPPC

The core issue of X-ray pulsar navigation technology is to carry a large area x-ray detector on the spacecraft to capture 1-10 keV x-ray pulses from the pulsar.However,in deep space environment,there is high-intensity background radiation making it difficult to obtain effective signal.In this paper,I analyzed the types and energy range of particles that generate interference signal and proposed multiple anti-coincidence structure to anti-coincidence out interference signal and designed a "time amplitude single channel analyser(TASCA)+ time-digital converter(TDC)" signal screening circuit to screening the main detector output signal,though this way,background interference can be reduced and the detection efficiency of low-energy X-ray can be improved.In order to realize the function of the particle detection unit,a kind of low noise,gain good linearity,fast time response current sensitive preamplifier must be designed to processing and amplify output signal of MPPC.In order to realize the function of the particle detection unit,in this paper,I designs a current sensitive preamplifier.This current sensitive preamlifier is a high-speed current sensitive preamplifier,it can realize a nanosceond level pulse shaping.In addition,in this paper,I also verify the linearity of the gain,measure the noise level of this preamplifier and test response of preamplifier to the target signal.The experiment verify that the amplifier can work as required.