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Baseline voltage hold structure and pulse shaper

A voltage hold, pulse generator technology, applied in pulse shaping and other directions, can solve problems such as circuit changes

Inactive Publication Date: 2017-07-21
PEKING UNIV
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Problems solved by technology

At the same time, the mismatch existing in the circuit also changes with the change of ambient temperature

Method used

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  • Baseline voltage hold structure and pulse shaper
  • Baseline voltage hold structure and pulse shaper
  • Baseline voltage hold structure and pulse shaper

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Embodiment Construction

[0028] The present invention will be described in detail below through embodiments.

[0029] The amount of charge received by the radiation detector readout circuit is often very weak, which requires the pulse shaper to achieve a large multiple of gain. The readout circuit in the design verification achieves a magnification of about 40 times. The input mismatch of the charge-sensitive amplifier is usually on the order of several millivolts. Considering the mismatch of the resistors and capacitors in the circuit and the mismatch of the pulse shaper, the final baseline voltage drift can reach more than 100 millivolts. The tape-out test of the circuit structure without the baseline holding module is carried out. The test results of multiple channels show that the baseline drift value is random, and the maximum drift value can reach ±150mV. A channel is randomly selected for temperature testing. The relationship between the baseline voltage value (baseline) and the ambient tempera...

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Abstract

The invention discloses a pulse shaper with a baseline voltage maintaining structure and a DC coupling structure. The invention realizes the suppression of the baseline voltage drift of the readout circuit, and the baseline drift value, that is, the difference between the baseline voltage and the reference voltage is converted into a current value and amplified, and the amplified current is fed back to the input terminal of the previous stage to form a high gain , Narrow bandwidth negative feedback loop, so that the baseline voltage is fixed at the reference value. The method of the present invention enables the baseline voltage value to be determined by the feedback loop without being affected by non-ideal factors such as circuit component parameter adaptation; the switch of the feedback loop is controlled by the effective signal in the main signal path, ensuring the baseline maintenance module Has no effect on valid signals. The invention can meet the requirements of low power consumption and low noise radiation detection system, and will be widely used.

Description

technical field [0001] The invention belongs to the technical field of a readout structure and a readout method of a readout circuit of a radiation detection system. Background technique [0002] Radiation detection systems are widely used in high-energy physics, military affairs, industry and agriculture, medicine, astronomy and other fields. The core components of a radiation detection system include radiation detectors and readout circuits. The function of the radiation detector is to realize the conversion of the radiation quantity to the charge quantity, and the function of the readout circuit is to complete the processing and readout of the charge pulse signal. The readout circuit has a significant impact on the performance of the radiation detection system. In recent years, with the development of CMOS technology, large-scale CMOS radiation detector readout circuits have become mainstream. [0003] A typical radiation detector readout circuit includes several parts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/01
Inventor 陈晓璐张雅聪陈中建鲁文高周春芝邵建辉杨团伟刘大海刘正朱红英
Owner PEKING UNIV
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