DF in insulators for analogue IC - diyAudio
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Old 14th June 2013, 07:09 PM   #1
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Default DF in insulators for analogue IC

How important is this parameter? For example, PTFE vs FEP. Thanks
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Old 14th June 2013, 07:28 PM   #2
DF96 is offline DF96  England
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Can be very important for RF. Usually of no consequence for audio, except perhaps in capacitors in a precision filter. As the stray capacitance in a chip package will be small it will be insignificant for audio.
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Old 14th June 2013, 07:32 PM   #3
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Since all ICs have resistance, capacitance, and inductance-do they not act as filters to some extent? Then does DF come into play? Regards
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Old 14th June 2013, 07:42 PM   #4
DF96 is offline DF96  England
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Estimate the stray capacitance in a chip package. Calculate the impedance for 20kHz. Estimate the effect of even poor DF.
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Old 14th June 2013, 07:44 PM   #5
jcx is offline jcx  United States
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line level impedance, audio frequency, home system lengths? not an issue

PE, PP are great too - lots cheaper

for audio line output with ~<100 Ohms output Z, few 10s ft of 20 pF/ft cable - the fc is in MHz

so for audio any C effects are already < 1/100 of the divider Z at 20 kHz

and DF # are 10^-4 for PE, PP - so DF would be a ppm effect at 20 kHz, less below

Last edited by jcx; 14th June 2013 at 07:49 PM.
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Old 15th June 2013, 01:18 PM   #6
oshifis is offline oshifis  Hungary
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John,

Do you mean Integrated Circuit or InterConnect by IC ?
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Old 15th June 2013, 01:38 PM   #7
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I apologize for the confusion, Interconnect. Thanks for pointing out the error.
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Old 15th June 2013, 02:21 PM   #8
SY is offline SY  United States
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Also, remember what the package is made of. Hint: it's not PTFE.
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Old 15th June 2013, 05:54 PM   #9
DF96 is offline DF96  England
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What is the source impedance? Well-engineered source with low impedance? Idiosyncratic 'high end' source with high and (possibly) non-linear impedance?
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Old 15th June 2013, 08:22 PM   #10
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This is in a balanced circuit. 80ohms output, 47k input. Both very well engineered. Regards
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