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The trends of the VLSI technology is advancing, due to this majority of the industry players are showing interest in development of the devices with ultra low power applications. Analog-to-Digital converters are getting extensively used in Medical implant machines and in lots of Sensor machines, because it is serving an imperative role in interfacing between analog signal and digital signal. This paper presents a modernistic technique called as Sub threshold Current Mode Logic (CML) for ultra low power digital components. Here 16 bit SAR ADC is designed and compared with the techniques like CMOS and STCML for power consumption and delay. Schematics are materialized with Cadence Virtuoso tool using 45nm process. The transistors in these CML and CMOS operate at threshold voltages and Sub-threshold voltages where the executable design is done using 1V to 0.5V power supply (VDD). The comparator dissipates aggrandized power, so most of the intension is converged on forming this chunk. The CML logic procedure operates primarily with the current domain, due to this the performance can be constitutionally high. This approach decreases static power dissipation.

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In the present days, Very Large Scale Integration (VLSI) is focused upon designing energy efficient electronic devices. These are nothing but the embedded gadgets whose core is a processor. Advanced RISC Machine (ARM) is one of the families of computer processors which have an reduced instruction set architecture. Current Mode Logic (CML) is one of the low power logics which is used to design circuits with an extended battery life. The circuits built using this technique are capable of giving a dependable and sturdy system. In this paper, the proposed ARM7 microprocessor has been designed using the Sub threshold Current Mode Logic (STCML). All the design blocks operate in the sub threshold region at 0.24V power supply. The Data path of ARM7 has been implemented using Cadence Virtuoso Tool in 45nm technology. The results of the blocks have been viewed on Spectra Simulator and the power and delay calculations have been computed. The propound microprocessor is capable of finding place in DSP and other Embedded applications.