Michael,
Using risetime to calculate capacitance from a TDR trace is
problematic since it continually degrades. For a capacitance,
C, along a transmission line of impedance Zo, the AREA of the
reflection is the time constant Zo*C/2, exactly. (This can be
shown from the LaPlace final value theorem.)
Regards,
Mike
_____________. . . . . . . . ._____________
/ \ _/
/ \ Zo*C/2 __/
/ \________/
/
____/
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mike Jenkins Phone: 408.433.7901 _____ LSI Logic Corp, ms/G715 Fax: 408.433.7461 LSI|LOGIC| (R) 1525 McCarthy Blvd. mailto:[email protected] | | Milpitas, CA 95035 http://www.lsilogic.com |_____| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~**** To unsubscribe from si-list: send e-mail to [email protected]. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****