00001 /* Parasitic Cap, Resistance for metal lines 00002 */ 00003 00004 /* typical 4 layer PCB parameters 00005 ** Courtesy of www.icd.com.au/layere4.html 00006 */ 00007 #define MICROSTRIP_ER 4.7 00008 #define MICROSTRIP_H 16 00009 #define MICROSTRIP_T 0.7 00010 #define MICROSTRIP_W 7 00011 00012 /* Buffer delay for typical buffer load*/ 00013 #define BUFFER_DELAY 80 /* ps*/ 00014 00015 00016 typedef struct _microstrip_t { 00017 double dielectric; 00018 double width; 00019 double thickness; 00020 double height; 00021 double length; 00022 } microstrip_t; 00023 00024 00025 00026 double estimate_microstrip_capacitance(microstrip_t * spec); 00027