A Time-to-Amplitude Converter (TAC) with embedded analog-to-digital conversion is implemented in a 130nm CMOS imaging technology. The proposed module is conceived for Single-Photon Avalanche Diode imagers and can operate both as a TAC or as an analog counter, thus allowing both time-correlated or time-uncorrelated imaging operation. A single-ramp, 8-bit ADC with two memory banks to allow highspeed, time-interleaved operation is also included within each module. A 32x32-TACs array has been fabricated with a 50-JUD pitch in order prove the highly parallel operation and to test uniformity and power consumption issues. The measured time resolution (LSB) is of 160 ps on a 20-ns time range with a uniformity across the array within ±2LSBs, while DNL and INL are 0.7LSB and 1.9LSB respectively. The average power consumption is below 300IlW/pixel when running at 500k measurements per second.

A 32x32-Pixel Array with In-Pixel Photon Counting and Arrival Time Measurement in the Analog Domain

Stoppa, David;Borghetti, Fausto;
2009

Abstract

A Time-to-Amplitude Converter (TAC) with embedded analog-to-digital conversion is implemented in a 130nm CMOS imaging technology. The proposed module is conceived for Single-Photon Avalanche Diode imagers and can operate both as a TAC or as an analog counter, thus allowing both time-correlated or time-uncorrelated imaging operation. A single-ramp, 8-bit ADC with two memory banks to allow highspeed, time-interleaved operation is also included within each module. A 32x32-TACs array has been fabricated with a 50-JUD pitch in order prove the highly parallel operation and to test uniformity and power consumption issues. The measured time resolution (LSB) is of 160 ps on a 20-ns time range with a uniformity across the array within ±2LSBs, while DNL and INL are 0.7LSB and 1.9LSB respectively. The average power consumption is below 300IlW/pixel when running at 500k measurements per second.
9781424443543
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11582/5111
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