Preamplifier with wide dynamic reading range at front end of radiation detector

A wide dynamic range, preamplifier technology, used in charge amplifiers, radiation measurement, radiation intensity measurement, etc., can solve the problem of inability to meet the design requirements of semiconductor radiation detectors, expand the input dynamic range, realize automatic processing, The effect of rapid gain adjustment

Active Publication Date: 2020-12-15
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

When the signal range input to the front-end readout circuit is too large, the conversion gain of the preamplifier originally fixed and the high conversion gai...

Method used

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  • Preamplifier with wide dynamic reading range at front end of radiation detector
  • Preamplifier with wide dynamic reading range at front end of radiation detector
  • Preamplifier with wide dynamic reading range at front end of radiation detector

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Embodiment Construction

[0020] Such as figure 1 As shown, a preamplifier for reading out a wide dynamic range at the front end of a radiation detector in the present invention is composed of a single-ended charge-sensitive amplifier CSA, a voltage comparator VCM, a first D flip-flop D1 and a second D flip-flop D2. The single-ended charge sensitive amplifier CSA is composed of a single-ended folded cascode amplifier AMP, a primary feedback capacitor Cf0, a first feedback capacitor Cf1, a second feedback capacitor Cf2, a first switch SW1, a second switch SW2 and a reset switch SWR. . The primary feedback capacitor Cf0 is a first-level feedback branch, the first feedback capacitor Cf1 and the first switch SW1 are connected in series to form a second-level feedback branch, and the second feedback capacitor Cf2 and the second switch SW2 are connected in series to form a third-level feedback branch. The reset switch SWR constitutes a discharge branch. The first-stage feedback branch, the second-stage fe...

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Abstract

The invention discloses a preamplifier with a wide dynamic reading range at the front end of a radiation detector, which is characterized in that the preamplifier can automatically adjust the size ofa feedback capacitor according to the size of an input signal so as to realize automatic adjustment of conversion gain. The preamplifier is composed of a single-ended charge sensitive amplifier CSA, avoltage comparator VCM, a first D trigger D1 and a second D trigger D2. Compared with an existing radiation detector front-end read-out amplifier, the preamplifier has an automatic gain adjustment function, the gain is adjusted to be high when the charge quantity is low, the gain is automatically switched to be low when the charge quantity is high, both the first D trigger D1 and the second D trigger D2 adopt D triggers with asynchronous reset, and a first switch SW1, a second switch SW2 and a reset switch SWR adopt improved transmission gate circuits, so that the influence of a charge injection effect on the circuit is effectively reduced, and the input dynamic range of the front-end read amplifier is expanded.

Description

technical field [0001] The invention belongs to the field of reading out the front end of a radiation detector, in particular to a preamplifier for reading out a wide dynamic range at the front end of a radiation detector. Background technique [0002] In recent years, due to the gradual expansion of the energy range of particles measured by semiconductor radiation detectors, the dynamic range of the charge signal output from the detector to the front-end readout circuit has become larger and larger, which can range from several fC to pC levels. The weak charge signal output by the device is integrated and amplified, and the charge signal is converted into a voltage signal, and then filtered and noise-reduced. When the signal range input to the front-end readout circuit is too large, the conversion gain of the preamplifier originally fixed and the high conversion gain front-end amplifier circuit will be saturated with the increase of the input signal, which cannot meet the d...

Claims

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Application Information

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IPC IPC(8): H03F3/70G01T1/24H03K3/356
CPCH03F3/70H03K3/356G01T1/247
Inventor 刘书焕李龙李卓奇刘双瑛张君张坤黄泰燚许江涛张国和阿米尔卡洛·菲奥里尼
Owner XI AN JIAOTONG UNIV
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