Low-Noise Preamplifier Based on PMT and Its Signal Processing

摘要

Through the establishment of the noise model for photomultiplier, estimate the signal-to-noise ratio of the photomultiplier tube, using the principle of photoelectric detection technology, combined with the needs of practical applications; select the appropriate photoelectric multiplier tube, from the two aspects of the dynamic design and static design to ensure the correct output signal of the photomultiplier tube. The low noise preamplifier will amplify the output signal of photomultiplier tube without noise as soon as possible. This article describes the design principles of the photomultiplier tube selection and application. From the op-amp selection, multistage amplifier circuit design, circuit noise estimation, PCB board layout line and shielding, proposed a practical circuit design of 10MHz band width; and matters needing attention and its signal processing method. The simulation results show that the signal amplifying circuit designed, this circuit design can be very well amplifying and processing the output signal of the photomultiplier tube. To verify the theory of articles derived from circuit simulation to the actual test. Simulation results show that the signal amplifying circuit design, this form of circuit design can be very good enlarged and processing the output signal of the photomultiplier tube. From the actual test, the test results show that the accuracy and practicality of the simulation results.