A radiation detection readout circuit with current feedback baseline holder
This paper describes a radiation detection readout circuit for portable dosimeter which is aimed at low power, low noise and high counting rate. A current feedback baseline holder circuit is proposed to solve the baseline shift problem without any other performance deterioration. The core circuit has been implemented in 0.35μm CMOS technology. It achieves 46mV/fC conversion gain, 200kcps counting rate and consumes 260μA current from 3.3V supply. When no detector is connected to the chip, the equivalent input noise charge is 0.094fC rms.