Slow rising edge pulse signal identification circuit

Abstract

The invention relates to a slow rising edge pulse signal identification circuit. The slow rising edge pulse signal identification circuit includes a differential unit, a zero crossing comparison unit and a pulse width identification unit; the differential unit performs differential processing on unipolar photon pulse signals inputted from the outside, so that bipolar signals with two zero crossing points can be formed and transmitted to the zero crossing comparison unit; the zero crossing comparison unit converts the bipolar signals into digital pulse signals with a certain pulse width according to a set comparison threshold value, and transmits the digital pulse signals to the pulse width identification unit; and the pulse width identification unit judges whether the width of the digital pulse signals exceeds a set identification threshold value, and judges that the photon pulse signals inputted from the outside are slow rising edge signals and outputs a high-electric level pulse if the width of the digital pulse signals exceeds the set identification threshold value, otherwise, outputs a low-electric level pulse. The slow rising edge pulse signal identification circuit of the invention has the advantages of simple circuit form and high sensitivity.

Description

technical field [0001] The invention relates to a pulse signal detection circuit. Background technique [0002] The X-ray pulsar navigation sensor is one of the keys to realize X-ray pulsar navigation, and it is required to realize large-area and high-sensitivity detection of X-ray pulsar radiation signals. In the space radiation environment, high-energy particles interact with satellite and telescope materials, and the detectors will receive high-energy particles and their secondary excited particles. It is difficult to capture only a few celestial source radiation in the complex X-ray background. Signal. For this reason, reducing the background of the telescope is the basic requirement for realizing high-sensitivity astronomical observation. Background, the main sources include the cosmic X-ray radiation background, particles captured by the geomagnetic field, and the earth's reflection. Since the rising edge of the signal output by the interaction between high-energy p...

AI Technical Summary

Problems solved by technology

[0004] The double constant ratio timing method uses two constant ratio timing circuits with different thresholds to judge the speed of the rising edge of the pulse. The constant ratio timing circuit is complex and consumes a lot of power;

[0005] The combination method of leading edge timing and constant ratio timing uses the timing relationship between leading edge timing and constant ratio timing to judge whether it is a slow rising edge pulse. This method is easy to trigger by mistake and has low sensitivity;

[0006] The method of combining charge and current uses the characteristic that the current corresponding to the slow rising edge pulse signal is smaller than the charge signal, and compares the attenuated charge signal with the delayed current signal, but its circuit form is complicated

Images