Hi, can somebody explain this RLC circuit to me?

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Discussion Overview

The discussion revolves around the analysis of an RLC circuit, focusing on the values of capacitors and inductors, their effects on filter responses, and the interpretation of graphical data related to circuit performance. Participants explore the implications of circuit modifications at a frequency of 100 MHz and how these changes affect filter characteristics.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant questions the values of capacitors C6 and C5, and inductors L1 and L6, seeking clarification on their significance in the context of three different circuits.
  • Another participant discusses the effects of modifications on filter responses, noting that the series inductor and capacitor configuration produces a symmetrical response, while the two inductor and two capacitor configurations yield different characteristics at varying frequencies.
  • There is a request for gain plots to further understand the circuit's performance.
  • A participant expresses uncertainty about the color coding of the plots, specifically questioning whether the red trace indeed represents a steeper response at higher frequencies.
  • Another participant disagrees with the characterization of the red trace, suggesting it falls off steeper at lower frequencies instead.
  • There is a request for clarification on which output corresponds to which color in the plots.

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of the filter response plots, particularly regarding the steepness of the red trace at different frequencies. No consensus is reached on this point, and the discussion remains unresolved regarding the correct interpretation of the graphical data.

Contextual Notes

Participants reference modifications to the circuit and their effects on frequency response, but the discussion lacks detailed mathematical derivations or assumptions that underpin these modifications.

michael1978
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Hello to everbody can you help me how come C6 to be 10p and c5 13.5 and and l1 to be 190n and L6 240n
i start with 100Meghz, with one circuits 50/XL or 50/XC now become three different thanks
i understand the first circuit, i understand the second circuit, but now they make three circuits
how come
those
how come C6 to be 10p and c5 13.5 and and l1 to be 190n and L6 240n
rlc.gif
fgfggfg

tutorial...
It is very interesting to check the effects of this modifications on the
filter response in Fig.7
The response show that while the filter with
series inductor and capacitor has a symmetrical
response (blue trace), the two inductor filters has
steeper response at higher frequencies (red
trace), this network is normally referred as low
pass coupling. The two capacitor filter has
steeper response at low frequencies (green
trace), this type of coupling is referred as high
pass coupling.
Fig. 7
Note that in the two coupling capacitor filter, the
value of resonant capacitor C5 has been
decreased in order to compensate the frequency
shift caused by the two coupling capacitors, in
the two inductor filter inductance L1 has been
increased to compensate for the frequency shift
caused by the two inductors
 

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michael1978 said:
It is very interesting to check the effects of this modifications on the
filter response in Fig.7
Can you Upload the gain plots too please? Thanks.
 
berkeman said:
Can you Upload the gain plots too please? Thanks.
BANDPASSPLOT.jpg
 

Attachments

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    BANDPASSPLOT.jpg
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  • BANDPASSPLOT.jpg
    BANDPASSPLOT.jpg
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Last edited by a moderator:
michael1978 said:
the two inductor filters has
steeper response at higher frequencies (red
trace)
I may be colorblind. Is it the red plot that looks steeper at higher frequencies to everyone else?
 
Not to me. Red falls off steeper on the left (low freq.)

But perhaps he doesn't mean steeper and just chose the wrong word?
 
@michael1978 please indicate which output (OUT1, etc) corresponds to which co!or.
 
Merlin3189 said:
Not to me. Red falls off steeper on the left (low freq.)

But perhaps he doesn't mean steeper and just chose the wrong word?
greetings
 
thnx to everbody i solved
 

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