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Old 16th July 2008, 12:53 AM   #1
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Default ccs impendance formula

Hi
what is the formula for the impendance of ccs

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Old 16th July 2008, 01:10 AM   #2
SY is offline SY  United States
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Which CCS?
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Old 16th July 2008, 01:23 AM   #3
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Quote:
Originally posted by SY
Which CCS?

Sorry, see attached pic,sorry about drawing

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Old 16th July 2008, 01:27 AM   #4
SY is offline SY  United States
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That will be (1/hoe) + (Re)(hfe).
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Old 16th July 2008, 01:29 AM   #5
lineup is offline lineup  Sweden
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Maybe there is a formula.
Knowing the actual values for a CCS, in a circuit,
it should be possible to Simulate / calculate what impedance.
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Old 16th July 2008, 01:33 AM   #6
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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

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Old 16th July 2008, 02:07 AM   #7
SY is offline SY  United States
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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.
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Old 16th July 2008, 02:18 AM   #8
CBS240 is offline CBS240  United States
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Here is a page that shows the AC model with the relationship of H parameters.

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Old 16th July 2008, 05:22 PM   #9
AndrewT is offline AndrewT  Scotland
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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?
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Old 16th July 2008, 05:34 PM   #10
SY is offline SY  United States
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http://home.pacifier.com/~gpimm/ccs_performance.htm
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