Charge measuring circuit

Abstract

The invention relates to a charge measuring circuit, which comprises an IV conversion circuit, a plurality of voltage following circuits, a plurality of voltage-to-charge circuits and an ASIC circuit,and is characterized in that the IV conversion circuit is used for converting detected charge pulse signals into voltage pulse signals; the voltage following circuits are used for performing voltagefollowing on the voltage pulse signals to generate following voltage pulse signals and performing buffer isolation on front and back circuits; the plurality of voltage-to-charge circuits are identicalto the plurality of voltage following circuits in number, arranged at the rear ends of the voltage following circuits in a one-to-one correspondence manner and used for converting the voltage pulse signals outputted by the voltage following circuits into charge pulse signals, and capacitor with different capacitance are connected to the voltage-to-charge circuits respectively so as to expand themeasurement dynamic range; and the ASIC circuit is used for measuring the charge pulse signals outputted by the plurality of voltage-to-charge circuits respectively. The charge measuring circuit has high measurement accuracy, large dynamic range and good linearity.

Description

technical field [0001] The invention relates to a measurement circuit, in particular to a charge measurement technology. Background technique [0002] Since the beginning of the 21st century, scientists all over the world have been accelerating the scientific detection and exploration of the interstellar environment. Because the environment outside the Earth’s atmosphere is filled with a large number of radiation particles of different types and energies, mainly including electrons, protons, alpha particles and heavy particles. Ions, if you want to accurately measure the energy spectrum of these particles, the characteristics of element types and fluxes and their changing laws, you need a high-precision, large dynamic range charge measurement circuit, such as requiring an energy resolution of 10% and a dynamic range of 3.5 ×103. At present, the interstellar environment parameters are blocked by foreign countries, and all the interstellar environment parameters need to be ob...

AI Technical Summary

Problems solved by technology

Therefore, it is particularly important to design a charge measurement circuit with high precision and large dynamic range. At present, this type of circuit is also a difficult point in the design of space measurement circuits. Generally, high-energy measurement is realized, but low-energy particle energy measurement cannot be taken into account. On the contrary, If the measurement of low-energy particles is realized, the measurement of high-energy particles cannot be taken into account. In addition, space particles will cause single-event effects on the components in the satellite, which will seriously affect the stability of the satellite’s in-orbit operation. At least 20% is caused by the single event effect, so the selection of the device is also extremely difficult. It is necessary to select the performance index to meet the requirements, but also to choose the one with strong radiation resistance.

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