Abstract
In this paper, the design of a low-power continuous-reset CMOS charge-sensitive amplifier (CSA) is presented. The proposed CSA is intended for capacitive sensor readout circuits, in particular, interface circuits for solid-state detectors used in medical imaging and X-ray spectroscopy. A proof-of-concept interface circuit is designed and fabricated in a 0.13-µm CMOS process and consists of the proposed CSA, a pole-zero cancellation circuit, and a second-order semi-Gaussian programmable pulse shaper. Measurement results show that the conversion gain of the CSA and the pulse shaper are about 8.8 and 13.9 mV/fC, respectively. The CSA can accept signals of both polarities and the charge integration is linear from about −9 to 6 fC. The measured equivalent noise charge of the CSA is about 111 ē-rms. The CSA occupies 0.0021 mm2 of silicon area and consumes only 37.5 µW from dual supply voltages of 0.9 and 1.2 V.
Published Version
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