title: A Design of a New Column-Parallel Analog-to-Digital Converter Flash for Monolithic Active Pixel Sensor.
abstract: The CMOS Monolithic Active Pixel Sensor (MAPS) for the International Linear Collider (ILC) vertex detector (VXD) expresses stringent requirements on their analog readout electronics, specifically on the analog-to-digital converter (ADC). This paper concerns designing and optimizing a new architecture of a low power, high speed, and small-area 4-bit column-parallel ADC Flash. Later in this study, we propose to interpose an S/H block in the converter. This integration of S/H block increases the sensitiveness of the converter to the very small amplitude of the input signal from the sensor and provides a sufficient time to the converter to be able to code the input signal. This ADC is developed in 0.18μm CMOS process with a pixel pitch of 35μm. The proposed ADC responds to the constraints of power dissipation, size, and speed for the MAPS composed of a matrix of 64 rows and 48 columns where each column ADC covers a small area of 35 × 336.76μm2. The proposed ADC consumes low power at a 1.8 V supply and 100 MS/s sampling rate with dynamic range of 125 mV. Its DNL and INL are 0.0812/-0.0787 LSB and 0.0811/-0.0787 LSB, respectively. Furthermore, this ADC achieves a high speed more than 5 GHz.
authors.affiliation: CED-ST, LESSI, Faculty of Sciences Dhar el Mehraz, Sidi Mohamed Ben Abdellah University, BP 1796, Fez-Atlas, 30003 Fez, Morocco.
authors.forename: Mostafa
authors.identifier: 0000-0002-9722-4398
authors.initials: M
authors.lastname: Chakir
authors.affiliation: CED-ST, LESSI, Faculty of Sciences Dhar el Mehraz, Sidi Mohamed Ben Abdellah University, BP 1796, Fez-Atlas, 30003 Fez, Morocco.
authors.forename: Hicham
authors.identifier: 0000-0003-1897-456X
authors.initials: H
authors.lastname: Akhamal
authors.affiliation: CED-ST, LESSI, Faculty of Sciences Dhar el Mehraz, Sidi Mohamed Ben Abdellah University, BP 1796, Fez-Atlas, 30003 Fez, Morocco.
authors.forename: Hassan
authors.initials: H
authors.lastname: Qjidaa