Power supply noise measuring device

Details Power supply noise measuring device Power supply noise measuring device

G - Physics

01

R

G01R 29/26 (2006.01) G01R 31/28 (2006.01)

Patent

CA 2498545

According to one embodiment, a signal from a power supply line is caused to pass through a high pass filter, and a first signal is generated by adding a voltage-divided signal to the signal. In addition, a second signal obtained by adding the voltage-divided signal to an identification voltage is generated. A comparator outputs a comparison result of comparing a voltage of the first signal with a voltage of the second signal, and a counter counts up a count value when the voltage of the first signal is higher than that of the second signal. A sample hold circuit sample-holds the count value just before the counter is reset.

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