4results about How to "Low noise performance" patented technology

The application relates to the technical field of integrated circuits, in particular to a self-bias LDO circuit applied to a radio frequency communication chip. The self-bias LDO circuit comprises a core circuit module, a self-bias circuit module and an input selection circuit module. The core circuit module is used for generating an output voltage in fixed proportion to an input voltage; the self-bias circuit module is used for generating a reference voltage and a bias current irrelevant to a power supply voltage and providing the operation amplifier with the input voltage and the bias current; and the input selection circuit module is used for selecting the input voltage and the bias current for the operation amplifier. The core circuit module comprises an operation amplifier OP and resistors R1-R2; the positive input end of the operation amplifier OP is connected with the source end of an NMOS tube MN1 and the source end of an NMOS tube MN2; the negative input end is connected with the ground through the resistor R2 and connected with the output end VO through the resistor R1; and the output end VO is connected with the power supply end of the self-bias circuit module. The self-bias LDO circuit is used to solve the problem of the near-end phase noise deterioration of a phase-locked loop caused by the low-frequency noise of the power supply end.

The utility model discloses a sodium ion measurement signal transmission structure with anti -interference shield, including transmission mechanism, transmission mechanism includes core layer, the magnetic ring layer of wrapping in the core layer outside, the shield layer of covering in the magnetic ring layer outside, the compound layer of interference fit sleeve joint in the shield layer outside, the anticorrosive layer of sleeve joint in the compound layer outside. In the utility model, the core layer of silver plated copper core line setting realizes low impedance, bottom noise ability, then again cooperation ferrite magnetic bead made magnetic ring layer can absorb high frequency interference, guarantee the transmission effect of core layer, after the layout design of copper net one, braided copper net two, realize full -coverage magnetic ring layer, effectively improve electromagnetic shielding function, then again cooperation electromagnetic shielding in compound layer supplies energy, further ensure signal lossless transmission.

This utility model relates to a head massager, comprising a shell and a rear shell. A massage assembly is located at the front of the shell, and an essential oil assembly is located in the middle of the massage assembly. A light panel assembly, a drive assembly, a circuit board, and a rechargeable battery are located at the rear of the shell. The massage assembly includes multiple sets of massage rods spaced apart from each other, a flexible cover, a support, a swing seat, and a track gear composite component. The front of the swing seat is fastened to the rear of the massage rod. A spherical massage head is located at the front end of the massage rod, and a ball is located at the rear of the swing seat. This ball slides in a slide rail and simultaneously swings radially with the slide rail. Each set of massage rods is an integrated structure, molded together in a silicone mold used for producing the flexible cover, saving assembly time and improving work efficiency. The spherical massage head at the front end of the massage rod effectively prevents tingling sensation on the head during massage. The entire product is fully sealed, improving waterproofing and reducing mechanical noise. This design is compact, portable, and easy to carry.

This utility model relates to the field of microphone technology and discloses a low-noise microphone packaging unit, including a base and pins equidistantly fixed inside the base. A slot is formed on the upper surface of the base, and a cover plate is inserted into the slot. A silicone block is fixedly connected to the inner wall of the cover plate, and a sealing component is installed at the connection between the cover plate and the base. This utility model, through the setting of a sealing component and a multi-layered sealing structure involving the sliding of the sealing block, the expansion of the airbag, and the adhesion of the silicone pad, blocks external noise and dust, ensuring the low-noise performance of the microphone. The silicone block also buffers vibration and improves the stability of chip operation. Furthermore, the base uses a BT resin organic substrate, which reduces electromagnetic coupling noise and suppresses vibration noise. When removing the cover plate of the packaging unit, the sealing bolts are unscrewed to release the high pressure, and the cover plate can be quickly removed to replace the chip with the help of the silicone elastic block, reducing the risk of substrate damage, simplifying the process, and improving efficiency.