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A fault detection method for detects, within a semiconductor device, a fault in a delay chain that is provided within the semiconductor device and is made up of delay parts that are each formed by delay cells. The method judges if a fault exists in a first specific delay cell within a first delay part when testing the first specific delay cell, by detecting a first relative delay time between input and output signals of the first specific delay cell, and processing the first relative delay time at a timing based on an output of a delay cell within a second delay part that is provided at a stage preceding or subsequent to the first delay part. The method judges if a fault exists in a second specific delay cell within the second delay part exists when testing the second specific delay cell, by detecting a second relative delay time between input and output signals of the second specific delay cell, and processing the second relative delay time at a timing based on an output of a delay cell within the first delay part.

Methods and systems are provided for calibrating a compressor surge line. In one example, a method may include adjusting the compressor surge line based on a vehicle speed in addition to a compressor pressure ratio. For example, at higher vehicle speeds, above a threshold vehicle speed, a less aggressive surge line calibration may be utilized in order to improve drivability while at lower vehicle speeds, below the threshold vehicle speed, a more aggressive surge line calibration may be utilized for NVH mitigation.

In a two-port non-reciprocal circuit device, connecting portions of a first central electrode are electrically connected to first and second balanced input terminals, respectively. Likewise, connecting portions of a second central electrode are electrically connected to first and second balanced output terminals, respectively. First and second resistors are electrically connected between the first balanced input terminal and the first balanced output terminal and between the second balanced input terminal and the second balanced output terminal, respectively. First to fourth matching capacitors are electrically connected between the connecting portions of the first and second central electrodes and ground, respectively.

Methods and systems are provided for calibrating a compressor surge line. In one example, a method may include adjusting the compressor surge line based on a vehicle speed in addition to a compressor pressure ratio. For example, at higher vehicle speeds, above a threshold vehicle speed, a less aggressive surge line calibration may be utilized in order to improve drivability while at lower vehicle speeds, below the threshold vehicle speed, a more aggressive surge line calibration may be utilized for NVH mitigation.