PCB tswj impedance yog hais txog cov yam ntxwv impedance ntawm cov teeb liab kab nyob rau ntawm lub rooj tsavxwm luam tawm. Nws yog ib qho tseem ceeb rau siab -ceev thiab siab- zaus cov cim xws li USB, HDMI, Ethernet, PCIe, thiab DDR.
Tswj impedance yog txiav txim los ntawm cov kab dav, qhov sib nrug, tooj liab thickness, dielectric thickness, thiab cov khoom dielectric tas li (Dk). Yog tias lub impedance tsis tswj kom zoo, teeb liab kev xav, suab nrov, thiab cov ntaub ntawv yuam kev yuav tshwm sim.
Cov yam ntxwv impedance muaj xws li 50Ω rau ib zaug - xaus cov cim thiab 85Ω lossis 100Ω rau cov khub sib txawv. Thaum lub sij hawm PCB fabrication, impedance yog xyuas los ntawm kev xeem daim coupons thiab TDR ntsuas los xyuas kom meej lub teeb liab thiab txhim khu kev qha system.
