Abstract: An analog-digital conversion system includes an analog-digital converter; and a preamplifier circuit which is provided in the previous stage of the analog-digital converter and differentially amplifies an input analog signal. In the preamplifier circuit, an offset voltage and/or a noise occurs and/or is mixed. The preamplifier circuit outputs two types of analog amplified differential signals where a phase is inverted only with respect to the offset voltage and/or the noise. The analog-digital converter has an averaging circuit which averages the two types of analog amplified differential signals for each clock cycle of sampling preceding an analog-digital conversion and outputs a digital signal based on the differential signal averaged by the averaging circuit.

Abstract: An analog-digital conversion system includes an analog-digital converter; and a preamplifier circuit which is provided in the previous stage of the analog-digital converter and differentially amplifies an input analog signal. In the preamplifier circuit, an offset voltage and/or a noise occurs and/or is mixed. The preamplifier circuit outputs two types of analog amplified differential signals where a phase is inverted only with respect to the offset voltage and/or the noise. The analog-digital converter has an averaging circuit which averages the two types of analog amplified differential signals for each clock cycle of sampling preceding an analog-digital conversion and outputs a digital signal based on the differential signal averaged by the averaging circuit.

Abstract: An integrated circuit device includes a first power supply domain and a second power supply domain, wherein the first power supply domain includes a first power supply line and a second power supply line, an internal circuit between the first power supply line and the second power supply line, a first clamp circuit that electrically couples between the first power supply line and the second power supply line when a certain potential difference is generated between the first power supply line and the second power supply line, and at least one of a junction element that is between the first clamp circuit and the first power supply line and a junction element that is between the first clamp circuit and the second power supply line, the junction element allowing current to flow when the first clamp circuit becomes electrically conductive.