A 2D Channel Readout ASIC for Pixelated CdTe Detectors for Medical Imaging Applications


We tend to present a 16-channel readout integrated circuit (ROIC) with nanosecond-resolution time to digital converter (TDC) for pixelated Cadmium Telluride (CdTe) gamma-ray detectors. The 4×4 pixel array ROIC is the proof of concept of the 10×10 pixel array readout ASIC for positron-emission tomography (PET) scanner, positron-emission mammography (PEM) scanner, and Compton gamma camera. The electronics of every individual pixel integrates an analog front-finish with switchable gain, an analog to digital converter (ADC), configuration registers, and a 4-state digital controller. For every detected photon, the pixel electronics provides the energy deposited in the detector with 10-bit resolution, and a quick trigger signal for time stamp. The ASIC contains the 16-pixel matrix electronics, a digital controller, 5 international voltage references, a TDC, a temperature sensor, and a band-gap based mostly current reference. The ASIC has been fabricated with TSMC 0. 25 μm mixed-signal CMOS technology and occupies an area of 5. three mm×half-dozen.eight mm. The TDC shows a resolution of ninety five.5 ps, a precision of 60zero ps at full width half maximum (FWHM), and a power consumption of 130 μW. In acquisition mode, the total power consumption of each pixel is two hundred μW. An equivalent noise charge (ENC) of 160 e- RMS at maximum gain and negative polarity conditions has been measured at area temperature.

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