Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[SOLVED] dual circuit series parallel RLC

Status
Not open for further replies.
V

viranil

Newbie level 3
Joined
Apr 11, 2016
Messages
3
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
28
Hi, I'm trying to model a sinusoidally driven harmonic oscillator using RLC circuits using LTspice IV. I get a reasonable result for the series RLC circuit, but not for the parallel circuit. Can anyone catch what I'm missing?

Ideally they should both give me the same result.
Attached files show circuits and AC analysis results.
 

Attachments

  • parallel.png
    parallel.png
    38.6 KB · Views: 151
  • series.png
    series.png
    39.2 KB · Views: 115

In your image for the series connection, what voltage are you plotting? Is that the voltage across the resistor? I'm not really sure what you're trying to compare between the two.
 

Sorry, I'm trying to observe the motion of the mass of the harmonic oscillator:
in the series circuit - it's the current through the inductor
in the parallel circuit - it's the voltage across the capacitor
 

We could say the LC series and LC tank are nearly the same arrangement. Both have greater current flow at their resonant frequency. The difference is where you tap for the oscilloscope probe.

This simulation is a comparison. Notice where the scope traces tap the signal. The rolloff curves are nearly identical. Is this what you were aiming for?

LC tank LC series both similar bandpass.png
 

I think it is because of different values of the resistor.
 

@BradtheRad A little off topic but what circuit sim program are you using there?
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top