ESR and ESL of Ceramic Capacitor Applied to Decoupling Applications
نویسندگان
چکیده
Power distribution system noise affects computer product timing performance, signal integrity and electromagnetic interference. Between 1 MHz and 1 GHz, the primary means of reducing power distribution noise is with ceramic decoupling capacitors. To achieve a certain target impedance, it is important to characterize the ESR of ceramic decoupling capacitors as they directly determine the number of capacitors required on a board. A new technique to extract ESR is described in this paper. Another factor which determines the capacitance value of decoupling capacitors is the ESL (inductance) associated with capacitors mounted on a PCB. A study that compares the ESL of different pad layout geometries will also be presented.
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