Abstract: A resolver signal processing circuit for amplifying two phase signals output from a resolver includes first and second amplifier circuits configured to adjust an input in-phase voltage range to output an intended voltage even when a short-circuit arises in the resolver. The resolver signal processing circuit further includes first and second short-circuit detection circuits configured to detect the short-circuit arising in the resolver and short-circuits in first and second signal input paths from the resolver to the first and the second amplifier circuits, respectively, and first and second voltage adjusting units configured to adjust input in-phase voltage ranges of the first and second amplifier circuits when the first and second short-circuit detection circuits detect short-circuits, respectively. The first and second amplifier circuits are configured to adjust the input in-phase voltage ranges, respectively.

Abstract: A power supply control part supplies offset voltages from power supplies to each of signal wires at start time and then, after a predetermined delay time period, supplies a reference voltage from a power supply. A series resistor circuit of resistor elements is provided in each signal wire and a resistor element is connected between a supply node of the offset voltage and an input terminal of the series resistor circuit. A resistor element is connected between the supply node of reference voltage and the output terminal of the series resistor circuit provided in the signal wire of a high-potential side. A comparison logic part detects a disconnection of the signal wire based on a voltage developed at the input terminal of itself during the delay time.

Abstract: A power supply control part supplies offset voltages from power supplies to each of signal wires at start time and then, after a predetermined delay time period, supplies a reference voltage from a power supply. A series resistor circuit of resistor elements is provided in each signal wire and a resistor element is connected between a supply node of the offset voltage and an input terminal of the series resistor circuit. A resistor element is connected between the supply node of reference voltage and the output terminal of the series resistor circuit provided in the signal wire of a high-potential side. A comparison logic part detects a disconnection of the signal wire based on a voltage developed at the input terminal of itself during the delay time.