Patent ID: 9083370
Filing Date: 2015-07-14
Classification: H03M

Abstract:
1. An electronic apparatus comprising: a sensor; a detection circuit that amplifies a sensor signal outputted from the sensor and extracts a desired signal; and a A/D converter circuit that converts the desired signal from the detection signal into digital data; wherein the A/D converter circuit comprises: a comparison circuit; a control circuit that has a successive approximation register with a register value set by a comparison result signal from the comparison circuit, and outputs data for successive approximation; a first D/A converter circuit that D/A converts the data for successive approximation from the control circuit, and outputs a D/A output signal corresponding to the data for successive approximation; a second D/A converter circuit that D/A converts code data that changes over time, and outputs a code signal corresponding to the code data; and a correction section that performs a correction process, the comparison circuit performing a process to compare an added signal of a sampled signal of an input signal and the code signal with the D/A output signal, or a process to compare the sampled signal with an added signal of the D/A output signal and the code signal, the control circuit outputting output data obtained based on successive approximation result data of the successive approximation register and the code data as A/D conversion data of the input signal, and the correction section performing a correction process to correct the successive approximation result data so as not to overflow due to code shifting using the code data.