ANALOG CIRCUIT FOR AN ANALOG-TO-DIGITAL CONVERTER OF THE DUAL-SLOPE INTEGRATING TYPE

摘要

The analog circuit portion of an analog-to-digital converter of the dual-slope integrating type is comprised of a single, high gain differential amplifier having signal inverting and signal noninverting inputs and an integrating capacitor coupling the amplifier output to the inverting input. Analog signal is applied to the noninverting input to charge the capacitor and reference signal is selectively applied to the inverting input to discharge the capacitor. The range of measurement is determined by a resistor having one end connected to the amplifier inverting input and the opposite end connected to a constant potential source.