Design of an auto adaption unit for reconfigurable analog to digital converters

摘要

This paper shows an auto adaption unit for reconfigurable ADC that is designed for low power operation with the transistor being operated in weak inversion region. The presented adaptation unit separates high frequency bio-signals from low frequency bio-signals and configures the ADC in the correct mode of operation. The adaptive mechanism provides technological flexibility in order to reconfigure the analog to digital converter (ADC) resolution and sampling rate regardless of the direction of the converter. It produces control bits toconfigure the ADC, based on the frequency and amplitude of the input signal. The reconfigurable ADC along with a auto adaptation circuitis designed for bio-mpedance monitoring systems. The paper consists of pre-amplifier and utilized models of FVC and Schmitt trigger concepts to design auto adaptation unit. The adaption unit consumes 89 mu W with a supply voltage of 0.8 V. Simulation results found the frequency of input signals 1 to 10 MHz for the 10 KHz input signal, the DC voltage produced by the frequency-to-voltage converter is - 691 mV.The entire circuitry is designed, simulated and analyzed by using Cadence EDA tool with 18nm Fin-FET technology.