A power conversion device includes: a plurality of legs, each leg including a high-side switch connected between a voltage supply node and a phase node and a low-side switch connected between the phase node and a reference node; a phase current sensor for each leg and configured to sense current flowing through the high-side switch or the low-side switch of the corresponding leg; a single current sensor connected between the reference node and the low-side switches, or between the voltage supply node and the high-side switches; and a controller. During a subperiod of a switching period, the controller is configured to sample the current sensed by at least one of the phase current sensors and a current sensed by the single current sensor such that the current in one or more of the legs is sampled during the same subperiod as the current flowing through the single current sensor.

Certain aspects of the present disclosure are generally directed to circuitry and techniques for voltage-to-current conversion. For example, certain aspects provide a circuit for signal amplification including a first amplifier; a first transistor, a gate of the first transistor being coupled to an output of the first amplifier and a drain of the first transistor being coupled to an output node of circuit; a first resistive element coupled between a first input node of the circuit and an input of the first amplifier; a second amplifier; a second transistor, a gate of the second transistor being coupled to an output of the second amplifier and a drain of the second transistor being coupled to the output node of circuit; and a second resistive element coupled between a second input node of the circuit and an input of the second amplifier.

A current detection device (100) includes a shunt resistor (1) connected in series to a path through which a current flows; a first circuit (2) that converts a voltage across the shunt resistor (1) into a predetermined differential voltage; a second circuit (3) to which the predetermined differential voltage is input from the first circuit (2) via a pair of wirings (55) and that amplifies the predetermined differential voltage; a constant current circuit (4) connected between the pair of wirings (55); and an arithmetic circuit (5) that operates the current flowing through the path based on the voltage amplified by the second circuit (3).

Provided is an electrostatic capacitance sensor which can remove an influence of a noise occurring from a static eliminator or a driving source and accurately perform measurement even on electrostatic capacitance detected by a thin-type detection unit which can be passed to a finger surface of a wafer transfer robot. The present invention is provided with an AC supply source which supplies an AC voltage to a detection unit, a parasitic capacitance compensation circuit, an operational amplifier, a differential amplifier, a phase detection means, and a low pass filter. An operational amplification output terminal is connected to an inversion input terminal of the differential amplifier through a first band pass filter, the AC supply source is connected to a non-inversion input terminal of the differential amplifier through a second band pass filter, an output terminal of the differential amplifier is connected to an input terminal of the phase detection means, and the phase detection means takes, as a reference signal, an AC signal output from the AC supply source.

A current sense circuit is described herein. In accordance with one embodiment, the circuit comprises: a first circuit node and a second circuit node configured to be coupled to a first terminal and a second terminal of a current sense resistor, respectively; an differential amplifier having a first input and a second input which are coupled to the first circuit node and the second circuit node via a first input resistor and a second input resistor; a voltage source, configured to set the voltage at the first input of the differential amplifier to a predefined DC voltage; and a controllable current mirror configured to sink or source a first current in its input branch based on one or more outputs of the differential amplifier and to generate a corresponding second current in its output branch. The input branch is coupled to the second input of the differential amplifier. A biasing circuit is configured to generate a bias current and is coupled to the controllable current mirror to superpose the bias current with either the first current or the second current.

In one implementation, a circuit can include a reference pin and an operational amplifier that can include an output pin, an inverting input pin and a non-inverting input pin. The inverting input pin can be electrically coupled to the output pin via a first impedance and to the reference pin via a second impedance. The non-inverting input pin can be electrically coupled to the reference pin via a third impedance and can be configured to receive a detection signal. The reference pin can be configured to receive a detection reference signal associated with the detection signal.

The disclosure relates to a method for detecting surface electric field distribution of nanostructures. The method includes the following steps of: providing a sample located on an insulated surface of a substrate; spraying first charged nanoparticles to the insulated surface; and blowing vapor to the insulated surface to observe a distribution of the first charged nanoparticles via an optical microscope.

A current sensor circuit comprises multiple resistive circuit elements of different values of electrical resistance arranged between at least one input terminal of the current sensor circuit and an output terminal; a first plurality of switching circuits coupled between the input terminal and the resistive circuit elements, wherein each switching circuit of the first plurality of switching circuits includes a pair of transistors connected in series; at least one drive amplifier including an output and an input connected to the output terminal; and a second plurality of switching circuits, each switching circuit including a first switch terminal coupled to the at least one drive amplifier output and a second switch terminal coupled to a common connection of a pair of transistors of the first plurality of switching circuits.

In some embodiments, a sensor device can include a base module including a battery and including a transceiver configured to communicate with a computing device. The sensor device may further include one or more sensor modules configured to releasably couple to the base module. Each sensor module may be configured to receive power from the base module and to provide data to the base module

The disclosure relates to a method for calculating surface electric field distribution of nanostructures. The method includes the following steps of: providing a nanostructure sample located on an insulated layer of a substrate; spraying first charged nanoparticles to the insulated surface; blowing vapor to the insulated surface and imaging the first charged nanoparticles via an optical microscope, recording the width w between the first charged nanoparticles and the nanostructure sample, and obtaining the voltage U of the nanostructure sample by an equation.