HIGH SPEED AND LOW POWER FLASH ADC USING THRESHOLD INVERTER QUANTIZATION TECHNIQUE
Publication Date : 30/01/2018
Conference Name :
Now a days low power and low voltage requirements becoming more important issues as the channel length of the MOSFET shrinks so below levels. For improvement of power and speed in an analog to digital converter major building block is a comparator. This paper presents a design of 4-bit low power flash ADC for system-on-chip applications using Threshold Inverter Quantization (TIQ) comparators. The technique threshold inverter quantization uses two cascaded CMOS inverters as a comparator that eliminates the requirement of resister or capacitor ladder circuit. Threshold inverter quantization provides high speed, low power, and smaller area. TIQ also eliminates the requirement of high gain differential input voltage comparator that are inherently more compound and slower than digital inverters. TIQ based flash ADC also eliminates the need of reference voltages, which require a resister ladder circuit. In the TIQ based flash ADC the reference voltage is internally generated by the circuit that is threshold voltage is used as a reference voltage for comparing the input voltage and produce the thermometer code. An efficient thermometer to binary converter has been designed using transmission gate based on 2*1 multiplexer. Power consumption reduced as per accordance to threshold voltage and for high speed transistor size must kept small.