Patent ID: 8436756

Claim:
An A/D conversion device comprising: an A/D conversion circuit that converts an inputted analog signal to digital data and outputs it; a digital signal correction unit that performs a correction process to the digital data and outputs a digital signal; and a phase compensation unit that performs phase compensation in accordance with a phase delay amount of the digital signal with respect to the analog signal generated in the A/D conversion circuit and the digital signal correction unit, wherein the A/D conversion circuit comprises: a pulse transit circuit in which plurality of linked inversion circuits including logical elements wherein the delay time between an input signal and output signal changes in accordance with the size of an applied power or an electrical current, and an activation signal for starting a pulse signal is inputted to one of the inversion circuits; a transmit position detection structure that detects a transit position of the pulse signal in the pulse transit circuit based on the output signals from the inversion circuits and generates data in accordance with the transit position; and a digital data creation structure that, based on the data outputted from the transmit position detection structure, creates digital data corresponding to the size of the power or the electrical current that changes in accordance with the inputted analog signal, the delay characteristic of the digital data being identified from the inputted analog signal.