A 2 V 10 b 20 MSample/s mixed-mode subranging CMOS A/D converter

Abstract

A 2V, lOb, 20MSampleis mixed-mode (voltage-mode and current mode) subranging CMOS AID converter CADC) suitable for video signal processing systems operates at the lowest power supply voltage (2V) and with the lowest power consumption (20mW) of any video-ADC reported to date [1][2][3][4][5]. Conventional video-ADCs using high-speed high·gain opamps and/or a large number of analog switches require at least a 2.5V supply.

A Study to Realize a CMOS Pipelined Current-Mode A-to-D Converter for Video Applications

“…However, the precision of the transferred and processed current is poor because of the terminal voltage difference, the V th variation and β variation of the transistors. To date, 6-bit and 8-bit implementations have been achieved for high-speed ADCs using the current-based approach [2], [3], [4]. However, the 8-bit implementation used the calibration method to maintain accuracy [4].…”

Power considerations in sub-micron analog CMOS

“…In many cases this yields an increase in power consumption to cope with those requirements. Although performance-critical analog circuits require a higher supply voltage it is important to design low-voltage amplifiers, data converters, filters and understand the ultimate limits for power, dynamic range and linearity [5], [6], [7], [8]. Very low power circuits have to sacrifice dynamic range, linearity or accuracy.…”