“The CMOS Inverter” as a Comparator in ADC Designs

Authors:
Ali Tangel;Kyusun Choi
Affiliations:
Department of Electronics and Communication Engineering, University of Kocaeli, Veziroglu Kampusu, 41040 Izmit, Turkey. atangel@kou.edu.tr;Department of Computer Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA. kyusun@cse.psu.edu
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2004

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Abstract

This paper introduces a single-ended non-offset-cancelled flash ADC architecture, the “Threshold Inverter Quantizer” (TIQ). The TIQ is based on a CMOS inverter cell, in which the voltage transfer characteristics (VTC) are changed by systematic transistor sizing. As a result, a significant improvement of speed and reduction of area and power consumption is achieved. A sample TIQ based flash ADC chip including 3-bit, 4-bit and 6-bit versions together has been designed and fabricated with the 2 μ standard CMOS n-well technology. The proposed ADC cells are suitable for System-on-Chip (SoC) applications in high speed wireless products.