You could try measuring risetime into a capacitive load. This is essentially dv/dt into C and measures the current drive of the buffer. Measure this at several different capacitive loads. Plot the points and see if the current source is a good model for your buffer. If the risetime doesn't change much over a range of capacitive loads, then your buffer is better modeled by a voltage source. Watch out for stray inductance in your test setup. Chuck Hill, consultant At 11:30 AM 7/23/01, Peterson, James F (FL51) wrote: >Hello, > >What's the best way to specify the ac drive strength of a buffer? The >requirement should be testable. > >I was thinking about defining it with a source impedance at typical >voltage/temp's....any suggestions on how to test this? > >thanks, >Jim >------------------------------------------------------------------ >To unsubscribe from si-list: >si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >For help: >si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > >List archives are viewable at: > //www.freelists.org/archives/si-list >or at our remote archives: > http://groups.yahoo.com/group/si-list/messages >Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu