We all know that the impedance required by the customer is of course as small as possible, which is beneficial to its charging or transmission. So what is the impedance of the usb3.0 data wire? Let's take a look at it:
1. Insulation wire diameter: diameter of the insulated wire increases - impedance increases; diameter of the insulated wire is uneven - impedance is not uniform.
2. Conductor wire diameter: wire diameter of the conductor is increased— impedance is reduced; wire diameter of the conductor is not uniform— impedance is not uniform. Design improvement: the impedance is too small, increase the wire diameter or increase the foaming degree. Process improvement: the capacitance of the water is adjusted small, pay attention to prevent the deformation of the core wire during twisting, and pay attention to the tension adjustment during coaxial knitting.
3. Foaming degree: the degree of foaming increases - the dielectric constant decreases - the impedance increases; the degree of foaming is uneven - the dielectric constant is not uniform - the impedance is uneven.
4, the twist pitch: a) unshielded pair: the twisted pitch decreases - the impedance decreases; b) the shielded pair: the twisted pitch increases - the impedance decreases;
5, wrapping: large tension around the package - aluminum foil tight - low impedance.
6, cable pitch (non-pair shielding): cable pitch reduction - impedance reduction.
7, the cable wrap (non-pair shielding): the cable is tight - the impedance is reduced.
8, woven elastic (non-pair shielding): braided tight - impedance reduction.
External tightness (non-pairing): external tightness - low impedance