Patent ID: 8378873
Filing Date: 2013-02-19
Classification: H03M

Abstract:
1. An AD conversion apparatus that converts an analog input signal into digital output data, comprising: a pattern generating section that, for each target bit specified one bit at a time moving downward in the output data, generates a pattern signal having a pulse width or number of pulses corresponding to a weighting of the target bit; an integrating section that integrates the pattern signals according to a judgment value for judging a value of the target bit each time a pattern signal is generated, and outputs a reference signal obtained by accumulating the integrated value of each pattern signal; a comparing section that, each time generation of a pattern signal is finished, compares the input signal to the reference signal; and an output section that outputs the output data to have values corresponding to the comparison results obtained after each generation of a pattern signal corresponding to a bit is finished, wherein from a second bit that is immediately below the most significant bit in the output data and onward, the integrating section integrates each pattern signal according to the judgment value based on the comparison result obtained after the generation of the immediately prior pattern signal.