8 results about "Common-mode signal" patented technology

A power converter is provided. In one aspect, the power converter has a first inverter and a second inverter electrically coupled with one another and with a power bus. First switches of the first inverter are arranged symmetrically with second switches of the second inverter so that, when switched in a pulse width modulated switching scheme, the first switches generate a first common mode signal and the second switches generate a second common mode signal that is one hundred eighty degrees out of phase with the first common mode signal. In another aspect, the power converter includes a buck stage having one or more pairs of symmetrically arranged buck switches that can be controlled to reduce or eliminate common mode electromagnetic interference in the buck stage. The power converter can also include one or more pairs of symmetrically arranged inductors.

The present disclosure relates to a diplexer with an impedance inverter. The diplexer can be used to isolate a transmitter and a receiver that share a common antenna. The diplexer is balanced by using an impedance gradient that provides an impedance that causes a balun of the diplexer to cut off access to the common antenna rather than replicate the antenna impedance. Such a cut off can have lower insertion loss than a diplexer that replicates the antenna impedance only to separate differential signals and common mode signals of the receiver and transmitter.

A signal detection circuit (400) includes a signal input terminal (402), a rectifier circuit (404), a comparator circuit (406); a current source (408), and a comparator output terminal (412). The rectifier circuit (404) is coupled to the signal input terminal (402) and configured to receive an input signal and generate a rectified signal based on the input signal. The comparator circuit (406) is coupled to the rectifier circuit (404) and configured to receive a common mode signal and generate a difference current based on a difference of the common mode signal and the rectified signal. The current source (408) is coupled to the comparator circuit (406) and configured to generate a reference current. The comparator output terminal (412) is configured to provide an output signal based on a difference of the reference current and the difference current.

In a multi-channel electrocardiogram measuring device including a plurality of electrocardiogram measuring sections for measuring an electrocardiogram, it is made possible to obtain a clear electrocardiogram while suppressing noise. An electrocardiogram measuring section (13) includes a positive and negative pair of electrode bodies (20, 21) configured as a capacitively coupled electrode and capable of being disposed in a non-contact state on a human body, a signal amplifying section (23) that amplifies electrical signals from the two electrode bodies (20, 21) and outputs the signals as electrocardiogram signals, and an inverting output section (28) that inverts common mode signals of the electrical signals from the two electrode bodies (20, 21) and outputs the signals as inverted signals. When the electrocardiogram measuring section (13) in which the inverted signals from the inverting output section (28) are input to the positive electrode body (20) is defined as a first channel (13A) and the electrocardiogram measuring section (13) in which the inverted signals from the inverting output section (28) are input to the negative electrode body (21) is defined as a second channel (13B), the two channels (13A, 13B) are simultaneously present.

The present application relates to the technical field of optical element surface physical property testing, and discloses a structured light testing system for optical element surface patterns, which comprises: a pair of phase conjugate structured light fields for alternately illuminating the optical element, synchronous acquisition of Fourier domain diffraction patterns and spatial domain in-situ light field intensity distribution, and calculation of a differential signal to determine a defect position after correction of the diffraction patterns by the in-situ light field intensity distribution. The present application presets a common mode signal cancellation mechanism for defect-free periodic patterns at the physical layer level through conjugate illumination and differential processing, thereby suppressing a large amount of redundant information and retaining and highlighting only the asymmetric scattering signal caused by defects, which makes the focus of detection shift from the accuracy of measuring geometric morphology to the uniformity of distinguishing the physical properties of material optical response, and realizes high signal-to-noise ratio rapid discrimination of functional defects.

The application provides an electromagnetic prospecting device and method based on a vehicle shell, the device comprising: at least two electromagnetic signal collectors for collecting electromagnetic signals in at least two directions; a common mode signal suppression module for eliminating common mode signals caused by the environment and the vehicle in the electromagnetic signals, and generating differential mode signals caused by minerals; a vehicle-mounted dynamic interference suppression module for collecting interference source noise signals of the vehicle, and eliminating the interference source noise signals in the differential mode signals to obtain pure signals; a prospecting module for inputting the pure signals into a mineral identification model to obtain a mineral existence probability and a mineral type; and the mineral identification model is a deep learning model representing a mapping relationship between the pure signals and the mineral existence probability and the mineral type. The application uses the vehicle shell as an antenna, improves the prospecting efficiency, and improves the prospecting accuracy through the processing of the electromagnetic signals.

A system, comprising: a reference magnetic field source that is configured to generate a reference magnetic field; a plurality of magnetic field sensing elements arranged in a sensing bridge, the sensing bridge being configured to sense the reference magnetic field and an external magnetic field simultaneously, the sensing bridge being configured to output a first signal and a second signal; a first circuit that is configured to generate a common mode signal of the sensing bridge based on the first signal and the second signal; an adjustment circuit that is configured to adjust a sensitivity of the sensing bridge based, at least in part, on a common mode signal of the sensing bridge; and a processing circuitry that is configured to use a differential signal of the sensing bridge to generate an output signal, the differential signal being based on a strength of the external magnetic field.

According to the embodiments of the present application, a common mode level conversion circuit and a clock buffer are disclosed. The common mode level conversion circuit comprises a first level conversion circuit, a first variable current source configured to receive a first input signal to generate a first output signal; a second level conversion circuit, a second variable current source configured to receive a second input signal to generate a second output signal; and a feedback circuit configured to receive the first output signal and the second output signal to output a first feedback signal; wherein the first input signal and the second input signal comprise a first common mode signal, the first output signal and the second output signal comprise a second common mode signal, and the current of the first variable current source and the second variable current source is controlled according to the first feedback signal to make the second common mode signal close to a preset value. The common mode level conversion circuit in the present application has a better signal-to-noise ratio.