Analog-to-digital converter

Abstract

An analog-to-digital converter comprises amplifiers, an analog switch connected with its inputs to the amplifiers and a multistage comparison unit receiving at its input the output signal from the switch. The converter further comprises a serial code translator ensuring the translation of the parallel code coming from the unit into a sequence of pulses sent to the input of a digital switch. The converter is provided with a reversible counter and a counter, the inputs of both counters being connected to the commutator; The output signal from the counter is sent to a code rollout-rollin unit and to a code analyzing unit which is connected through a register to a scanning mode determining unit, the output signal from the unit coming to the unit and to an analog-to-digital converter connected with its output to the input of the first amplifier (2<u1>u). A control unit presets a working algorithm of the said converter, so that in the course of direct conversion mode the process of conversion of the input analog value into a n-bits p-code takes place after K cycles, whereas in the course of metrological control mode bit numbers are determined, the deviation of metrological characteristics of which exceed admitted values.