Ansoft_SIwavetraining_basic.ppt

* Speaker notes NOT to be printed * * Speaker notes NOT to be printed Our simulation results show much better Low Frequency response which actually meets our Adaptive Target Impedance specs. Next, we will be focusing on the high impedance response. Our resonance simulations shows this frequency to be at around 550MHz. And our resonance plot shows a hot-spot present a this frequency at location near main CPU. The main question is what is correct decoupling capacitor value that will be sued here? Please check the cap’s impedance profile. (Next page) 3_PinGroup_DC_C_siw 3_PinGroup_DC_C_Resonance.siw * * Speaker notes NOT to be printed We chose Murata 0.33nF GRM188R71H331. Because this capacitor can provide a low impedance at 500MHz and here is capacitor impedance profile plot. We can see capacitor resonance at around 500MHz. And then redo the SIwave S-Y-Z parameter analysis. * Speaker notes NOT to be printed As expected we cleared/shifted our 500 MHz resonance but now we have a resonance at about 750 MHz. We can simply add a 56pF GRM1885C1H560JA01 capacitor here. 4_PinGroup_C1_Resonance.siw 4_PinGroup_C1.siw * * Speaker notes NOT to be printed We chose Murata 56pF GRM1885C1H560JA01. Because this capacitor can provide a low impedance at 750MHz and here is capacitor impedance profile plot. We can see capacitor resonance at around 750MHz. And then redo the SIwave S-Y-Z parameter analysis. * Speaker notes NOT to be printed Final resonance simulation and impedance profile results show a small resonance at 160 MHz. What is a solution here? Add 2.2nF GRM188R71H222KA01 capacitor here. 5_PinGroup_C2_Resonance.siw 5_PinGroup_C2.siw * * Speaker notes NOT to be printed We chose Murata 2.2nF GRM188R71H222KA01. Because this capacitor can provide a low impedance at 160MHz and here is capacitor impedance profile plot. We can see capacitor resonance at around 160MHz. And then redo the SIwave S-Y-Z parameter analysis. * * Speaker notes NOT to be printed Our f