# \#frequency-response **URL:** https://forum.plexim.com/tag/frequency-response/175.md [Latest](https://forum.plexim.com/latest.md) · [Categories](https://forum.plexim.com/categories.md) · [Tags](https://forum.plexim.com/tags.md) --- ## [How to observe the perturbation signal when using Frequency Response analysis?](https://forum.plexim.com/t/how-to-observe-the-perturbation-signal-when-using-frequency-response-analysis/3285)
**Author:** [@physicboy](https://forum.plexim.com/u/physicboy)\ **Replies:** 3\ **Last updated:** [September 3, 2026, 4:28pm UTC](https://forum.plexim.com/t/how-to-observe-the-perturbation-signal-when-using-frequency-response-analysis/3285 "2026-09-03T16:28:53Z")
Hi, Just like the title, how to evaluate the perturbation signal when performance frequency response analysis? I tried putting scope on the perturbation source and nothing. I need to know the detail signal in my Sims a… --- ## [Noise in frequency response plot](https://forum.plexim.com/t/noise-in-frequency-response-plot/3281)
**Author:** [@Praneeth](https://forum.plexim.com/u/Praneeth)\ **Replies:** 4\ **Last updated:** [August 28, 2026, 5:12pm UTC](https://forum.plexim.com/t/noise-in-frequency-response-plot/3281 "2026-08-28T17:12:06Z")
I am trying to get bode plot of LLC converter using Frequency Response tool. But the plot has a lot of noise. Can you please help me understand what is happening? Bode\_Plot.plecs (256.4 KB) --- ## [Influence of Input Filter on Controller Stability](https://forum.plexim.com/t/influence-of-input-filter-on-controller-stability/2665)
**Author:** [@Munadir\_Ahmed](https://forum.plexim.com/u/Munadir_Ahmed)\ **Replies:** 0\ **Last updated:** [October 30, 2025, 9:34pm UTC](https://forum.plexim.com/t/influence-of-input-filter-on-controller-stability/2665 "2025-10-30T21:34:03Z")
DC/DC Controller Design without Input Filter DC/DC converters are often designed assuming an ideal input voltage source, capable of absorbing the switching ripple generated by the converter. In the example below, a buck … --- ## [\[Demo model\] Half-Bridge LLC Converter with Analysis Tools](https://forum.plexim.com/t/demo-model-half-bridge-llc-converter-with-analysis-tools/815)
**Author:** [@kd10](https://forum.plexim.com/u/kd10)\ **Replies:** 0\ **Last updated:** [July 23, 2020, 11:07am UTC](https://forum.plexim.com/t/demo-model-half-bridge-llc-converter-with-analysis-tools/815 "2020-07-23T11:07:43Z")
Hi, how to calculate value for Gain \[Hz/V\] in the block VCO w/programmable clock duty cycle? When I run closed-loop system and in the analysis tool window set frequency range \[100 100e3\] I got Bode plots as shown in th… --- ## [AC analysis tool prematurely terminating](https://forum.plexim.com/t/ac-analysis-tool-prematurely-terminating/711)
**Author:** [@Kartikeya](https://forum.plexim.com/u/Kartikeya)\ **Replies:** 1\ **Last updated:** [October 29, 2019, 2:58pm UTC](https://forum.plexim.com/t/ac-analysis-tool-prematurely-terminating/711 "2019-10-29T14:58:15Z")
Hi all, I am pretty new to PLECS. I am trying to simulate the bode plot for a converter and I have introduced a perturbation in the duty and am reading the output voltage perturbation. I have already gone through the ex… --- ## [Can we get accurate frequency sweep results for converters with a variable switching frequency using Analysis tools?](https://forum.plexim.com/t/can-we-get-accurate-frequency-sweep-results-for-converters-with-a-variable-switching-frequency-using-analysis-tools/693)
**Author:** [@Dilan](https://forum.plexim.com/u/Dilan)\ **Replies:** 1\ **Last updated:** [September 11, 2019, 12:03pm UTC](https://forum.plexim.com/t/can-we-get-accurate-frequency-sweep-results-for-converters-with-a-variable-switching-frequency-using-analysis-tools/693 "2019-09-11T12:03:06Z")
Hi there, I am trying to obtain the frequency response of a closed-loop buck converter. I am using a boundary control method to regulate output voltage of the buck converter.In this case, switching frequency is varying … --- ## [Bode plot DC gain not shwing in boost converter transfer function?](https://forum.plexim.com/t/bode-plot-dc-gain-not-shwing-in-boost-converter-transfer-function/323)
**Author:** [@EMdude](https://forum.plexim.com/u/EMdude)\ **Replies:** 5\ **Last updated:** [May 3, 2018, 3:00am UTC](https://forum.plexim.com/t/bode-plot-dc-gain-not-shwing-in-boost-converter-transfer-function/323 "2018-05-03T03:00:39Z")
Dears Sir/madam, I have designed a boost converter with peak current mode control and I wanted to evaluate the transfer function in bode plot of the Verr to Voutas you can see in the files added the boost converter give… --- ## [Multitone Analysis Resolution](https://forum.plexim.com/t/multitone-analysis-resolution/317)
**Author:** [@fdegioanni](https://forum.plexim.com/u/fdegioanni)\ **Replies:** 1\ **Last updated:** [March 28, 2018, 10:19am UTC](https://forum.plexim.com/t/multitone-analysis-resolution/317 "2018-03-28T10:19:02Z")
Hello, I have been running the multitone analysis to obtain the frequency response of switching converter (LLC). However, I am not pretty sure how it works. Sometimes the “resolution” of the response is pretty bad and t… --- ## [How to get the transfer function of DC/DC boost converter in open mode and current control mode?](https://forum.plexim.com/t/how-to-get-the-transfer-function-of-dc-dc-boost-converter-in-open-mode-and-current-control-mode/273)
**Author:** [@EMdude](https://forum.plexim.com/u/EMdude)\ **Replies:** 2\ **Last updated:** [February 19, 2018, 5:40am UTC](https://forum.plexim.com/t/how-to-get-the-transfer-function-of-dc-dc-boost-converter-in-open-mode-and-current-control-mode/273 "2018-02-19T05:40:21Z")
Hello everyone, I am trying to obtain the frequency response and transfer function of dcdc boost converter in the 02 mode , open and closed (current mode control). I have looked at the examples given but they are showi… --- ## [Why is my steady state analysis of a dc-dc converter aborted due to errors?](https://forum.plexim.com/t/why-is-my-steady-state-analysis-of-a-dc-dc-converter-aborted-due-to-errors/279)
**Author:** [@EMdude](https://forum.plexim.com/u/EMdude)\ **Replies:** 2\ **Last updated:** [February 16, 2018, 11:06am UTC](https://forum.plexim.com/t/why-is-my-steady-state-analysis-of-a-dc-dc-converter-aborted-due-to-errors/279 "2018-02-16T11:06:03Z")
Dear Community, As I am trying to get the frequency response of DC/DC converter,exactly the control to error transfer function Vout(s)/Verr(s) (Verror=Vref-Vout). after launching the analysis I get this error message as…