ccs impendance formula

fastdata · 16th July 2008, 12:53 AM

Hi
what is the formula for the impendance of ccs

regards
fastdata

SY · 16th July 2008, 01:10 AM

Which CCS?

fastdata · 16th July 2008, 01:23 AM

Quote:

Originally posted by SY
Which CCS?

Sorry, see attached pic,sorry about drawing

fastdata

SY · 16th July 2008, 01:27 AM

That will be (1/hoe) + (Re)(hfe).

lineup · 16th July 2008, 01:29 AM

Maybe there is a formula.
Knowing the actual values for a CCS, in a circuit,
it should be possible to Simulate / calculate what impedance.

fastdata · 16th July 2008, 01:33 AM

Quote:

Originally posted by SY
That will be (1/hoe) + (Re)(hfe).

thank you very much, but i dont understand the first part "hoe"
can you please explain what it is

fastdata

SY · 16th July 2008, 02:07 AM

hoe is the output admittance of the device (it's one of the hybrid parameters). It's not on every spec sheet, but it can be found for many common transistors.

CBS240 · 16th July 2008, 02:18 AM

Here is a page that shows the AC model with the relationship of H parameters.

AndrewT · 16th July 2008, 05:22 PM

Hi,
one can measure the static impedance.
measure the current that passes at operating voltage. Increase voltage slightly and re-measure the passing current.
[V1-V2]/[I1-I2] = impedance at that current and that voltage.

As one changes the current and/or changes the voltage the impedance varies.

Is there a simple way to measure dynamic impedance?

SY · 16th July 2008, 05:34 PM

http://home.pacifier.com/~gpimm/ccs_performance.htm

16th July 2008, 12:53 AM	#1
fastdata Account Disabled Join Date: Jul 2008	ccs impendance formula Hi what is the formula for the impendance of ccs regards fastdata

16th July 2008, 01:10 AM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Which CCS? __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

16th July 2008, 01:27 AM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	That will be (1/hoe) + (Re)(hfe). __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

16th July 2008, 01:29 AM	#5
lineup diyAudio Member Join Date: Dec 2005 Location: the north	Maybe there is a formula. Knowing the actual values for a CCS, in a circuit, it should be possible to Simulate / calculate what impedance. __________________ lineup

16th July 2008, 02:07 AM	#7
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	hoe is the output admittance of the device (it's one of the hybrid parameters). It's not on every spec sheet, but it can be found for many common transistors. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache


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16th July 2008, 02:18 AM	#8
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Here is a page that shows the AC model with the relationship of H parameters. __________________ All the trouble I've ever been in started out as fun......

16th July 2008, 05:22 PM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, one can measure the static impedance. measure the current that passes at operating voltage. Increase voltage slightly and re-measure the passing current. [V1-V2]/[I1-I2] = impedance at that current and that voltage. As one changes the current and/or changes the voltage the impedance varies. Is there a simple way to measure dynamic impedance? __________________ regards Andrew T.

16th July 2008, 05:34 PM	#10
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	http://home.pacifier.com/~gpimm/ccs_performance.htm __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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