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12 Threads found on edaboard.com: **Second Order Lpf**

time 4 some upgrade, Hello friends, I would
like 2 tweach my bridge inverter to pure sine
wave, I waz thinking, from my sg3524n ic,
send the signals to a **second** **order** **lpf** I
made with lm324, then send d signal. to a
pulse transformer Wired in bridge before
switching d power FETs. I will switch the
pulse transformer with d882 as d low (...)

Power Electronics :: 06-06-2014 15:51 :: Iykeeh Ezeonyekwelu :: Replies: **0** :: Views: **689**

1) Sure, but it also depends on your intended bandwidth, easiest would be a **second**-**order** (LC) low-pass filter.
2) You want a commercial software (ADS, AWR etc.)? Or free (e.g, )

Analog Circuit Design :: 05-28-2014 10:22 :: johnjoe :: Replies: **1** :: Views: **871**

SingerX,
at first, here are some basics on Butterworth approximation:
1.) For comparison, you need the n-th **order** lowpass function (normalization Ω=ω/ωc, ωc=3dB cut-off):
A(jΩ)=ao
2.) The MAGNITUDE function for a Butterworth approximation (n-th **order**

Analog Circuit Design :: 01-14-2014 10:49 :: LvW :: Replies: **9** :: Views: **1203**

what is the equation for the **second**-**order** **lpf**?
Different, depending on the pole Q. But always spanning 0 to -180 degeree.

Analog Circuit Design :: 09-25-2012 10:36 :: FvM :: Replies: **4** :: Views: **1249**

Hi Guys,
I have a RC **lpf** filter with fc=15.9KHz (R=10K and C=1nF). When I cascaded such two filters to form a **second** **order** filter and did an AC sweep, I got the new fc around 6KHz. But if I refer the formula for the fc of a **second** **order** filler with
R1=R2 and C1=C2, I should get the same fc (i.e 15.9KHz). (...)

Analog Circuit Design :: 02-21-2011 12:56 :: LvW :: Replies: **6** :: Views: **2742**

I designed a low pass filter as per the circuit given in
but the signal output is not coming correctly. For a sine wave input it gives out 3/4 of positive half correctly but the negative half of the sine wave is distorted and I do not know

Professional Hardware and Electronics Design :: 07-14-2010 04:17 :: Willykilly :: Replies: **5** :: Views: **1643**

hi all
In a PLL **lpf** filter, I am not able to achieve the required phase margin. I am using a **second** **order** passive filter. How can I improve my phase error. I can afford a max of 2 degrees but it is more than 30 degrees phase error?
Please reply

Digital Signal Processing :: 07-13-2010 17:24 :: Gagan_SJSU :: Replies: **0** :: Views: **717**

1. Any suggestions on a multiplier free **lpf** implementation?
Even if you manage to build a multiplierless **lpf** it is very likely that it won't have good performance.
2. Will a CIC work for the **second** stage also?
It may or may not depending on bandwidth of the signal of interest. You may end up with a situation when the (...)

Digital Signal Processing :: 06-30-2010 07:41 :: hobgoblin :: Replies: **1** :: Views: **1223**

Hi, guys, If we already have the parameters for passive third-**order** **lpf**, how to calculate the natural frequency and damping factor?
we can find the equations to get these for **second**-**order** **lpf**. but I do not know how to get those for third-**order** passive **lpf**.
thanks.

Analog Circuit Design :: 07-09-2008 12:27 :: gavin168 :: Replies: **4** :: Views: **5419**

Notice that the Filter Solution frequency units are radians/**second**.

Analog Circuit Design :: 08-14-2006 02:44 :: flatulent :: Replies: **8** :: Views: **1536**

Hi all,
I am designing this class D amplifier-closed loop. I used the normal PWM, output stage, **lpf**, feedback circuit and **second** **order** integrator.
I found the the third **order** harmonic is very high. THe fundamental peak is around 40db adn the third harmonic is around 2dB.
Is there some ways to reduce this harmonics? (...)

Analog Circuit Design :: 08-01-2006 10:26 :: aborigini :: Replies: **1** :: Views: **1404**

There are two **second** **order** effects to keep in mind.
1. Parasitic capacitances in the wiring and the buffer input and output. These will change the frequency response. As an example, your 1 pF series input capacitor will form a voltage divider with the several pF wiring capacitance and buffer input capacitance to reduce the gain.
2. The or

Elementary Electronic Questions :: 05-31-2006 15:22 :: flatulent :: Replies: **7** :: Views: **1509**

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