AYTAR, Oktay Abant İzzet Baysal Üniversitesi - Mühendislik Mimarlık Fakültesi - Elektrik Elektronik Mühendisliği Bölümü, Turkey

INVESTIGATION OF THE PERFORMANCE OF DIGITAL ENCODER CIRCUITS FOR THRESHOLD INVERTER QUANTIZATION BASED 5 BIT FLASH ANALOG TO DIGITAL CONVERTER

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This paper presents a 5-bit Flash Analog to Digital Converters(ADC) design using 0.18μm TSMC CMOS technology library. The designed system consists of two main blocks as a comparator array and digital encoders. In this paper, as a comparator is to use the so-called Threshold Inverter Quantization (TIQ) technique. As a digital encoder block has been used five different encoding circuits. Thus, the performance of different digital encoder blocks research in the designed system of using TIQ technique. The names of digital encoder block are programmable rom decoder, logic based, multiplexer based, fat tree and wallace tree decoder. Power supply of all designed circuits is 1.8V. The purpose of this work is to compare different digital encoder circuits according to power consumption and INL-DNL errors and counts of transistors. The simulation results show that the average maximum power consumption of systems is 291.42mW for wallace tree deceoder, the average minimum power consumption of systems is 27.378mW for pla-rom, the minimum number of transistor is 152 for logic based decoder. According to INL-DNL analysis, Logic based decoder has been the best INL-DNL performance and fat tree decoder has been the worst INL-DNL performance.

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Threshold Inverter Quantization , Digital Encoder Block , Flash A , D Converter

Sdu International Technologic Science

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