Patent ID: 11936396
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Measurement (Instruments)
Classification: CPC H  G | IPC H

Claim 6:
7. The AD converter with self-calibration function according to claim 6, wherein the summation and conversion unit comprises:
a switching section that connects, to a capacitance holding the unit voltage, the input voltage during conversion and either a reference voltage or a ground voltage at the time of calibration;
a summation section that, during conversion, makes the input voltage be held in the capacitance and thereafter sums any one of the two or more unit voltages to the voltage being held to generate a summed voltage, and at a time of calibration, makes the reference voltage or the ground voltage be held in the capacitance and thereafter sums any one of the two or more unit voltages to the voltage being held to generate a summed voltage;
a threshold voltage section that generates the threshold voltage; and
the comparator that outputs a comparison signal when the summed voltage exceeds the threshold voltage while the threshold voltage being connected with a negative input end and the summed voltage being connected with a positive input end.