Why Do Experimental Values Differ from Ideal in Filter Circuits?

  • Thread starter Thread starter physics4353
  • Start date Start date
  • Tags Tags
    Filters
Click For Summary

Discussion Overview

The discussion revolves around the discrepancies between ideal and experimental values in filter circuits, specifically focusing on electrical circuits that include resistors and capacitors. Participants explore various factors that may contribute to these differences, including component tolerances and the characteristics of active devices.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant notes that besides resistor and capacitor tolerances, there may be other factors affecting the output values.
  • Another participant requests more details about the lab setup, measurements, and the extent of deviation from ideal values to better understand the issue.
  • Input and output impedance are suggested as potential factors influencing the differences in values.
  • A later reply mentions that in active filters, the characteristics of the active device (such as transistors or operational amplifiers) can introduce deviations due to their non-ideal frequency characteristics, which may not align with the expected filter characteristics.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the causes of the discrepancies, and multiple competing views regarding the contributing factors remain present in the discussion.

Contextual Notes

Limitations include a lack of specific details about the experimental setup, measurements taken, and the precise nature of the deviations from ideal values.

physics4353
Messages
5
Reaction score
0
New poster has been reminded to use the Homework Help Template when posting schoolwork questions, and to post only one question per thread.
For my lab I need to explain why my ideal values are different compared to my experimental values. besides things like resistor and capacitor tolerances, what would cause a slightly different output?
 
Physics news on Phys.org
Can you give us more details about your lab? All we know right now is that you're working with an electrical circuit that includes resistors and capacitors. We don't even know what you measured or how far off from ideal your numbers were.
 
Input and output impedance?
 
In case of active filters the used active device (transistor, opamp,...) can introduce additional deviations from the ideal response.
This will happen if the limited non-ideal frequency characteristics of the device (frequency-dependent gain) does not allow the envisaged filter characteristics (Quality factor, bandwidth).
 
  • Like
Likes   Reactions: CWatters

Similar threads

  • · Replies 16 ·
Replies
16
Views
2K
  • · Replies 17 ·
Replies
17
Views
3K
Replies
16
Views
4K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
15
Views
3K
  • · Replies 2 ·
Replies
2
Views
5K
  • · Replies 5 ·
Replies
5
Views
2K