Accurate Dual Slope Analog-to-Digital Converter Using Bootstrap Circuit

This paper presents a simple and inexpensive implementation of the accurate dual slope analog-to-digital converter (ADC). The proposed technique with positive reference voltage takes advantages of a bootstrap circuit to function as a precise noninverting/ inverting integrator. To achieve the constant reference voltage during integrating analog input voltage interval, a sample/hold (S/H) circuit is employed. Experimental results are given to confirm the operation of the proposed ADC.