A measuring apparatus is provided for electrical signals. The measuring apparatus includes an analog-to-digital (A/D) converter configured to A/D-convert an analog signal to be measured, and an integrator configured to perform integration time processing for a plurality of digital values output from the A/D converter based on an integration time. The integrator is configured to output a plurality of measured values obtained by the integration time processing. A noise level calculation unit is configured to calculate a noise level of the analog signal to be measured from the plurality of measured values obtained by the integration time processing, and a display unit is configured to display noise levels corresponding to a plurality of integration times.

The present disclosure relates to a first circuit for measuring a first current, the first circuit including a current step-down circuit, a logarithmic comparator circuit, and a differential voltage amplifier circuit. A first input of the current step-down circuit is configured to receive the first current, and a first output of the current step-down circuit is configured to provide a ratiometric step-down current to a first logarithmic amplifier via a current mirror assembly. The logarithmic comparator circuit includes the first logarithmic amplifier, configured to convert the ratiometric step-down current into a logarithmic first voltage, and a second logarithmic amplifier, configured to provide a logarithmic reference voltage. The differential voltage amplifier circuit is configured to compare the logarithmic first voltage with the logarithmic reference voltage.

Systems, apparatus, and methods that provide a flexible current sensor capable of measuring current flowing through a conductor without contacting the conductor. In various implementations, a flexible current sensor may have a comparable size, shape, and appearance as a flexible loop of a Rogowski coil, except the current sensor described herein can sense direct current (DC). The current sensors of the present disclosure utilize a novel open loop degaussing mechanism to provide accurate DC current measurements in a conductor. To achieve this, a current sensor includes an AC degaussing coil wrapped around a magnetic core. A driver circuit drives an AC degaussing signal in the AC degaussing core, which operates to reset or degauss the magnetic core, thereby providing more accurate current measurements.

An inspection device comprises circuitry configured to: acquire a first characteristic signal and a second characteristic signal each indicating electrical properties of an inspection target region in an object to be inspected to which a test voltage or a test current is applied; output a noise signal including noise included in the test voltage or the test current applied to the inspection target region; perform filtering on the noise signal; modify a parameter for the filtering in such a manner that a difference between noise included in the first characteristic signal and noise included in the noise signal after the filtering is reduced; perform a noise reduction to noise included in the second characteristic signal using the noise signal on which the filtering has been performed with the modified parameter.

Wireless circuitry is provided that includes a circuit configured to output a radio-frequency signal and a power detector having an input configured to receive the radio-frequency signal. The power detector includes an input transistor and an attenuation circuit coupled to a gate terminal of the input transistor and having series and shunt capacitors of the same capacitor type. The series and shunt capacitors of the same capacitor type can be configured to automatically track process variations of one another for mitigating sensitivity to the process variations. The series and shunt capacitors can have adjustable capacitances that are tuned to adjust a linearity of the power detector.