The Front-end Radiation Signal Detection Module Based on CdZnTe

To detect weak radiation signal, a front-end signal processing module based on CdZnTe radiation detector is designed, fabricated and verified. The module is mainly composed of three sections which are the preamplifier, forming circuit and buffer filter. AD8605 is employed as the core to design the preamplifier, then CR-RC
³
is selected as the main structure to design the forming circuit, and the two-stage Sallen-key filter is used to form the filter circuit. In addition, the gain regulator, buffer and power filter circuits are integrated to build the weak signal processing module. The test results show that the noise can be suppressed in the range of 102~162 e
^-
at 0~35°C. And the non-linearity of the output voltage at room temperature is less than 3.75 %, the energy resolution of
²⁴¹
Am 59.5 keV radiation source can reach 8.6%, which can meet the requirements of weak radiation signals detection.