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A Low-Power Reduced Kick-Back Comparator with Improved Calibration for High-Speed Flash ADCs
Guy TORFS Zhisheng LI Johan BAUWELINCK Xin YIN Jan VANDEWEGE Geert Van Der PLAS
IEICE TRANSACTIONS on Electronics
Publication Date: 2009/10/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Components
comparator, kick-back, calibration, low-power, flash ADC,
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A novel low-power kick-back reduced comparator for use in high-speed flash analog-to-digital converters (ADC) is presented. The proposed comparator combines cascode transistors to reduce the kick-back noise with a built-in threshold voltage to remove the static power consumption of a reference. Without degrading other figures, the kick-back noise is reduced by a factor 8, compared to a previous design without cascode transistors. An improved calibration structure is also proposed to improve linearity when used in an ADC. Simulated in a standard CMOS technology the comparator consumes 106.5 µW at 1.8 V power supply and 1 GHz clock frequency.