5results about How to "Reduce common mode noise" patented technology

The invention discloses a multichannel optical transmission device based on periodic optical filters. The multichannel optical transmission device comprises a multichannel light source, a phase modulator array, a multi-wavelength light beam combiner, a light beam splitter, a first periodic optical filter, a second periodic optical filter and a balanced photoelectric detector. Multi-channel radio frequency signals are modulated to optical signals with different frequencies through the phase modulator array, bias point closed-loop control is not needed, the modulated optical signals are transmitted through the same optical fiber, the number of transmission optical fibers can be reduced, phase differences and intermodulation in the transmission process of the multi-channel radio frequency signals can be reduced, and the transmission efficiency of the multi-channel radio frequency signals can be improved. An upper sideband and a lower sideband of a radio-over-fiber signal are respectively filtered out through the periodic band-pass filter, demodulation of a phase modulation signal is realized through an upper sideband signal and a lower sideband signal through the balance detector, optical transmission common-mode noise and even-order harmonics are reduced, the optical transmission signal-to-noise ratio and the harmonic suppression ratio can be improved, the integration level is high, use is flexible, and the application range is wide.

The utility model relates to filter protection circuit and camera of camera head, including image acquisition sensor, connecting port and image processing chip, still including TF common mode filter circuit, electrostatic protection circuit and spread spectrum IC circuit, TF common mode filter circuit is connected with image acquisition sensor, electrostatic protection circuit and TF common mode filter circuit and connecting port are connected, and the CSI the CLK port of image processing chip, the MCLK port of connecting port all are connected with spread spectrum IC circuit, application circuit of this application can reduce the common mode noise of data to the greatest extent, reduce EMI radiation, can reduce electrostatic interference data transmission, can also make the synchronous clock of protocol also have spread spectrum, thereby reducing clock radiation, this application can solve the EMI radiation emission and electrostatic protection problem of MIPI CSI -2 camera head very well, especially applicable to small, data bandwidth is high, clock frequency is high and the camera product of transmission MIPI CSI -2 protocol.

The utility model discloses a socket backplane connector, including: a terminal fitting and a terminal insulator fixedly connected with the terminal fitting, the head of the terminal fitting is provided with a plurality of groups of connecting terminals, the same group of connecting terminals is divided into grounding terminals and differential signal terminals, both sides of the terminal fitting are provided with outer shielding sheets, and the outer shielding sheets are arranged in the terminal fitting. Wherein one of the outer shielding sheets is provided with a plurality of groups of through holes at the positions of the differential signal terminals, and a plurality of groups of inner shielding sheets are arranged between the two outer shielding sheets. The two inner shielding sheets are used in cooperation with the outer shielding sheet to form a wrapping type shielding space, differential signal terminals in two adjacent groups can be isolated, the inner shielding sheets and the outer shielding sheets are grounded during use, the differential signal terminals in different groups can be shielded to prevent mutual interference, common-mode noise is reduced, and the anti-interference capability of signals is improved. Moreover, signal reflection and loss can be reduced, electromagnetic interference is effectively reduced, and the electromagnetic compatibility of the system is improved.

The utility model discloses a charging circuit of an equipment seat charger with strong anti-interference capability, which is provided with a power supply input module, an LDO (Low Dropout Regulator) step-down module and a step-up module which are connected with the output end of the power supply input module, a singlechip processing module connected with the output end of the LDO step-down module, and a charging control module connected with the output end of the step-up module, the single-chip microcomputer processing module is connected with the charging control module, and a power supply filtering module used for reducing common-mode noise is arranged between the power supply input module and the boost module and between the power supply input module and the LDO step-down module. According to the utility model, the power supply filtering module is additionally arranged at the output end of the power supply input module to filter the input power supply, so that common-mode noise is reduced, electromagnetic interference is reduced from the source, conducted interference and radiated interference are filtered out, the anti-interference capability of equipment is improved, and the requirement of an electromagnetic compatibility test standard is met. The utility model also has the characteristics of simple structure, low cost, high reliability and the like.

The present invention relates to optical interconnection communication technology, and in particular to a low-noise, high-gain, broadband fully differential transimpedance amplifier, comprising an input circuit and an amplifier circuit, a weak differential photocurrent input signal I generated by a photodetector, a first differential photocurrent input signal I inp and the second differential photocurrent input signal I inn Convert and amplify the differential voltage signal V into a large swing differential voltage output signal. outp and the second differential voltage signal V outn , used to drive the circuit with a 100Ω differential matching impedance in the rear stage. Low noise design is performed in the input circuit, while high gain broadband design is performed in the amplifier circuit. Both the input circuit and the amplifier circuit adopt a fully differential structure, which can reduce the power supply V DD The amplifier is suitable for silicon-based ultra-high-speed monolithic integrated optical receiver systems, providing low-latency signal transmission for data centers and high-performance computing based on optical interconnection.