Current pre-amplifier, time resolution reading circuit and time resolution detection device

Abstract

The invention relates to a current pre-amplifier, a time resolution reading circuit and a time resolution detection device. The current pre-amplifier comprises a current input module which is used for receiving and outputting current signals; a current amplifier module which is used for receiving the current signals output by the current input module, amplifying the current signals and then outputting the current signals; a current to voltage conversion module which is used for receiving the current signals output by the current amplifier module, adjusting the current signals, converting all received current signals into voltage signals and then outputting the voltage signals; a cascading amplifier output module which is used for receiving the voltage signals output by the current to voltage conversion module and amplifying the voltage signals, thereby providing output signals; and a base line recovery module which is used for receiving the output signals and outputting current adjusting signals to the current amplifier module according to comparison results between the output signals and a reference voltage. The current pre-amplifier provided by the invention is characterized in low noise and applicability to a high parasitic capacitance APD sensor.

Description

technical field [0001] The disclosure relates to the fields of nuclear detection technology and nuclear electronics, in particular, to a current preamplifier, a time-resolved readout circuit and a time-resolved detection device. Background technique [0002] At present, there are two methods for studying lattice dynamics or phonon behavior in synchrotron radiation. One is the resonant inelastic scattering (NRS) of nuclear isotopes, which can give the dynamics of the interaction between nuclide atoms and surrounding coordination atoms. Behavior; the other is X-ray non-resonant inelastic scattering (IXS), which can obtain momentum-resolved phonon spectra. In these experiments, it is necessary to accurately measure the time when the fluorescent signal related to nuclear scattering reaches the detector, and the detector is required to have extremely high time resolution. The avalanche photodiode (APD) detector has the characteristics of high saturation and large dynamic range (...

AI Technical Summary

Problems solved by technology

In the NRS experiment, with 57 Fe nuclear resonance scattering is taken as an example, the X-ray energy is 14.4keV, the magnification of the APD sensor is M=50, and the nuclear scattering signal generated is about 32fC. Therefore, the NINO chip cannot meet the experimental requirements; (2) The NINO chip is only suitable for parasitic Sensors with capacitance < 10pF, which limits the application of NINO chips in many synchrotron radiation time-resolved experiments

In order to improve the experimental efficiency, APD sensors with large photosensitive areas are usually used in time-resolved experiments such as synchrotron radiation NRS and IXS. Area 10mm×10mm, parasitic capacitance 120pF), the NINO chip cannot read the signal of this kind of large parasitic capacitance APD sensor

[0004] Therefore, it is necessary to solve the problem that the current preamplifier used in the existing time-resolved readout circuit chip has large noise and is only suitable for sensors with parasitic capacitance <10pF, so as to meet the experimental requirements

Images