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## 3rd Order Butterworth Filter |

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3rd order loop filter , butterworth filter order , 3rd order low pass filter , 2nd order butterworth filter

1000 Threads found on edaboard.com: **3rd Order Butterworth Filter**

Hi there
Peace on you all,
I'm designing a **3rd** **order** mechanical **filter** and using electromechanical analogy i transformed it to equivalent electrical circuit and i want to simulate it on
Cadence to see its frequency response but 'floating nodes' error faces me everytime and i need help to know what is wrong 92925

Analog Circuit Design :: 06-27-2013 10:31 :: Tarek Abu ElSauod :: Replies: **1** :: Views: **293**

You could make a cascade of **3rd** **order** and next two 2nd **order** butterwoth **filter**s. The solution for 2nd and **3rd** **order** **filter**s you can find here:

Analog Circuit Design :: 06-30-2013 10:54 :: Dominik Przyborowski :: Replies: **4** :: Views: **331**

hey there... i've got question regarding 1st **order** **butterworth** **filter**...
i'm using Multisim software..
Question..
Design a first **order** **butterworth** low pass **filter** with cut-off frequency fo = 20 kHz and the gain K = 1. You will need to simulate the circuit using Multisim and shows that (...)

Analog Circuit Design :: 02-18-2010 19:42 :: naspek :: Replies: **5** :: Views: **6545**

Hi All,
I was trying to analyze 2nd **order** low pass butter worth **filter**. I have attached the image below.
I have few questions unresolved. I understand that , 2nd **order** **filter** response can be achieved by just connecting C1 bottom terminal to ground. Again we can provide gain independently from active device close loop gain (...)

Analog Circuit Design :: 01-31-2012 02:13 :: varunkant2k :: Replies: **9** :: Views: **4073**

Very unusual.
It is a classical lowpass with a series capacitor at the input that attenuates low frequencies and dc.
You are asking for the center frequency - but how do you define (in this **3rd** **order** case) the center frequency?
Edit: Classical bandpass responses are of 2nd **order** (or n=4,6...).
In this (unusual) case with n=3, you have two

Analog Circuit Design :: 06-27-2013 08:42 :: LvW :: Replies: **9** :: Views: **399**

I am supposed to simulate the spectrum of first **order** **butterworth** **filter** using DFT...
However, I have no clue on what sample function to use... Anyone care to help?

Digital communication :: 09-26-2007 09:00 :: tomatokid :: Replies: **1** :: Views: **607**

Dear forum members and experts,
I have some questions regarding the measurement of my taped-out active **3rd** **order** **butterworth** **filter**.I am trying to extract the bode diagram of the **filter**.
I attach a screenshot that contains the schematic of the board (PCB) where the **filter** is placed.
The (...)

Analog IC Design and Layout :: 05-17-2012 09:25 :: jimito13 :: Replies: **0** :: Views: **287**

First, if the full scale of your 16-bit adc is 5V, the LSB is actually 76uV (5/2^16)... Again, the **filter** will not affect the resolution of the ADC but, of course, it will affect the amplitude of the input signal and therefore your SNR.
One of the missing pieces is how much you want to attenuate the 4.8kHz and why do you need to do it with a **3rd**

Analog Circuit Design :: 01-07-2010 20:51 :: JoannesPaulus :: Replies: **3** :: Views: **980**

Hello
I can't find the transfert function of this **filter**
What is the best method to fidn the transmitance of it ?
What is the form of the transmitance should I have ?
Does the **3rd** **order** low pass **filter** is always the product of the f

Analog Circuit Design :: 03-11-2011 10:17 :: glias :: Replies: **15** :: Views: **1452**

h0w do I derive a loop **filter** coefficient to implement design for a **3rd** **order** sigma delta modulator in chain of inetgrator, weighted feed forward summation which has a high pass **butterworth** NTF with a normalised cut off frequency at 1/16

Digital Signal Processing :: 10-16-2013 11:13 :: olowobaba :: Replies: **1** :: Views: **306**

Some lecture notes states that **butterworth** **filter** is monotonic in both pass band and stop band.
However, I believe it is not true, only if all poles's angle >45°.
Then, why some people call this type of **filter**, maximally flat?
thanks,
Neoflash

Digital Signal Processing :: 05-14-2006 11:05 :: neoflash :: Replies: **5** :: Views: **2818**

Why the pass band gain of a low pass/High pass **butterworth** **filter** is 1.586?

Analog Circuit Design :: 01-26-2007 07:09 :: srutisahoo :: Replies: **4** :: Views: **5425**

I want 4kHz LPF, I design R=780K, C=10pF, and 3 same RC in series, the -3dB is about 4KHz, is the design right?
if right but the size is too big to integrate in IC, can anyone give me some instruction to design a low cost LPF, thanks!

Analog IC Design and Layout :: 07-26-2007 21:46 :: xiexi :: Replies: **2** :: Views: **2076**

HI
I am trying to design a low pass maximally flat RF **filter** the design requirments are set so that the **filter** is to be designed to be matched to a 50 ohm line i have calculated all of the components and matched the components to the line, in the design specification it is asking me to obtain a value for the reflection coeficient of less than

Analog Circuit Design :: 12-12-2010 08:25 :: mjl23 :: Replies: **1** :: Views: **1670**

Hello
I need to design FIR **filter** with cutoff frequency 100 Hz (with attenuation 3 dB at cutoff frequency), sampling frequency = 1000Hz and having **3rd** **order** **butterworth** characteristics, using the various types of window functions
Can anyone give me some ideas on how to do this?
Also, could you please tell me how to do (...)

Digital Signal Processing :: 06-14-2011 21:55 :: mahaju :: Replies: **1** :: Views: **1528**

What are the rules when choosing the PWM frequency (period), and the corresponding flter for audio applications? For instance, I have used PWM frequency of 8KHz with a 4th **order** **butterworth** **filter** with cut-off frequency of 3.8 KHz, and a very powerful (and annoying) frequency of 8KHz is present in the output signal. Considering the (...)

Microcontrollers :: 05-28-2004 06:20 :: Z80 :: Replies: **1** :: Views: **1054**

Hi,
can anyone tell me how to design a **3rd**-**order** sima-delta modulator for a 14bit ADC?

Analog Circuit Design :: 08-15-2004 22:44 :: birdqiang :: Replies: **1** :: Views: **1241**

I am using SONNET software to design a 4th **order** microstrip **filter**. The problem is, I was facing some problems to determine the correct gap of the resonator, as well as the ke. I can't get the equal characteristic ripple in my pass band simulation result. I need some advices...

Electromagnetic Design and Simulation :: 02-01-2005 09:16 :: seahjhenwei :: Replies: **0** :: Views: **699**

Hi, can pls explain how does the low pass **butterworth** **filter** of 5 poles and cutoff freq of 2Khz works after demodulation.. with a message freq of 100hz and carrier freq of 2khz..
Thanks,
:D

Electronic Elementary Questions :: 12-17-2005 22:52 :: silverstar_28 :: Replies: **1** :: Views: **3241**

i need to do 2 tone test for LNA , i am doing HB simulation for 2 tones but i don't know how to find out the intercept point of 'fundamental' and '**3rd** **order** harmonic'........can anyone help me ?
Please it is urgent ......

RF, Microwave, Antennas and Optics :: 01-20-2006 14:12 :: MK28 :: Replies: **2** :: Views: **3104**

Hi there,,
I am tyring to desing a 2nd **order** butterwort **filter** @ 4khz, I am using sallen-key desing approach...
however my gain is 7.4 db.. i want to make it unity gain.. can anyone help me figureing out unity gain.

Analog Circuit Design :: 04-20-2006 00:49 :: comp_freak :: Replies: **1** :: Views: **1451**

Hi,
Suppose you have an CMOS differential amplifier which has 2 exactly matched transistors.assume the transistors acts acording to the square law model.
since this is differential amplifier, the second **order** terms are in phase and thus cancell each other and you dont have 2nd **order** distortion as expected.
my question is, why there is (...)

RF, Microwave, Antennas and Optics :: 07-07-2006 07:06 :: Jim cage :: Replies: **2** :: Views: **1064**

hi
what's **3rd** **order** intercept point? pls explain

RF, Microwave, Antennas and Optics :: 12-17-2006 11:39 :: elec350 :: Replies: **3** :: Views: **698**

hi ,i am new to **filter** designing and want to know how can i design higher **order** bandpass **filter** using only L,R,C components.I don't want to use any active components.e.g. amplifier.
Any relevant material in this regard would be helpful.
Thanks.
Wajhat.

Analog Circuit Design :: 12-28-2006 14:57 :: wajahat :: Replies: **6** :: Views: **1926**

Hi,
I have decided to design second **order** loop **filter**. Actually what is the trade-off between loop **filter** bandwidth and jitter peaking. Maybe you all can give references on this issue.
thanks in advance

Analog Circuit Design :: 01-16-2007 05:35 :: faizalism :: Replies: **1** :: Views: **1218**

Hi, all
I want do design a 3db bandwidth of 10MHz 3 **order** **butterworth** **filter**,
what about the OP bandwidth of this design, 10MHz, 20MHz, 30MHz, 40MHz or any others?
thanks

Analog Circuit Design :: 04-25-2007 23:37 :: crossbow_123 :: Replies: **2** :: Views: **522**

I understand well the aspect mathematic of **butterworth** **filter**.
My problem now is, how to calculate the coefficients of the denominator of the transfer function in s-domain of an analog **butterworth** **filter** without looking up in the table? Of course, we are given a fomula to calculate the poles of a low pass (...)

Analog Circuit Design :: 04-30-2007 05:07 :: binhjuventus :: Replies: **2** :: Views: **1711**

I just want 4kHz LPF, I design R=780K, C=10pF, and 3 same RC in series, the -3dB is about 4KHz, is the design right?
if right but the size is too big to integrate in IC, can anyone give me some instruction, thanks!

Analog Circuit Design :: 07-25-2007 22:42 :: xiexi :: Replies: **1** :: Views: **1233**

I am trying to implement a **3rd** **order** CT sigma delta mod in simulink.I first need to implement the discrete time version.This is the block.I donno how to start off.The SD toolbox takes parameters of OSR and **order** and gives a **3rd** **order** I use the same NTF to compute the k values in this block.
Also after (...)

Analog Circuit Design :: 10-20-2007 18:16 :: vrs007 :: Replies: **1** :: Views: **722**

why can't we use a 2nd **order** DLL and wht is the modification by using the second **order** DLL..
even though we use DLL to change the phase differnce then wht is the purpose of using the 2nd **order** loop **filter**.

Analog Circuit Design :: 11-22-2007 06:56 :: shady205 :: Replies: **1** :: Views: **632**

Hi,
I'm trying to design a passband **filter** working in 869MHz centre frequency with a slope that assures 15 dB min. attenuation at 50MHz away from centre frequency.
With a circuit simulator I designed a **3rd** **order** Chebychev **filter** which could solve my problems. In particular I've made the **filter** giving to (...)

Analog Circuit Design :: 03-05-2008 05:49 :: ifelix :: Replies: **1** :: Views: **878**

Hi, rg350dxlover !
Quote: I'm supposed to design a **3rd** **order** **butterworth** low-pass **filter** and so I combined 1st **order** and 2nd **order** **butterworth** low-pass.
Perhaps I misunderstood your wording, however, just to avoid an error:
If you combine a first (...)

Analog Circuit Design :: 07-15-2008 03:09 :: LvW :: Replies: **3** :: Views: **1347**

Need circuit diagram for Active low pass **filter** (4th **order**)
for cutoff frequency 3.4khz using lm324

Analog Circuit Design :: 08-12-2008 05:28 :: angy :: Replies: **13** :: Views: **1057**

Thank you!
To drive the second **filter** resistor with a low impedance. I guess the output to the **filter** is a charge pump or something that cannot drive a resistor directly.
Why a charge pump can't drive a resistor dircetly? The loop **filter** without the buffer is a **3rd** **order** loop **filter** (...)

Analog IC Design and Layout :: 09-14-2008 02:19 :: siboy :: Replies: **2** :: Views: **684**

I have made a **3rd** **order** complex **filter** , when performing noise analysis using cadence , i put noise sources at both the inputs of I and Q channel , and saw the output noise at the I or Q channel , it was 45nV/sqrt(hz) . when i measured the input referred noise at the I or Q channel , it was about 100nV/sqrt(hz) although the gain is 0dB .
So (...)

Analog Circuit Design :: 05-07-2009 14:25 :: moh_hafez :: Replies: **1** :: Views: **1205**

Hi,
I have designed a **3rd** **order** CIC **filter**. However, the bitwidths I require for each of the integrators appear to be much bigger than I anticipated by calculation.
The **filter** can be summarised as:
Over Sampling Rate (OSR) = 512
Differential Delay (D) = 1
**order** = **3rd** (...)

Analog Circuit Design :: 07-30-2009 20:26 :: sammyt09 :: Replies: **0** :: Views: **1194**

Hi,
Call people help me understand what is the attached **3rd** **order** modulator's design type? Like MASH, FF3...
So that I can search for related literatures. Thanks.
Neo

Analog IC Design and Layout :: 01-02-2010 16:31 :: neoflash :: Replies: **0** :: Views: **543**

I figured out that the NTF is indeed quite flat in that band. It is a **3rd** **order** modulator with cascaded integrator and feed-forward

Digital Signal Processing :: 01-09-2010 23:22 :: neoflash :: Replies: **3** :: Views: **1980**

Hi,
I've done the correlation of the noise power of a **3rd** **order** modulator. Its block diagram is shown below.
I've two results to be compared:
1. Using closed-form formula and do integration.
2. Using verilog-HDL model and post process data in matlab to obtain the noise power.
The results are respectively 0.47 and 0.5037.
I would l

Digital Signal Processing :: 01-09-2010 23:26 :: neoflash :: Replies: **1** :: Views: **651**

Hi guys, my task is to cascade a 2nd **order** **butterworth** LPF with a 2nd **butterworth** HPF, individually my 2 **filter**s function exactly as I want, however when I connect them together (ie LPF -> HPF) I do not get any passband, when my LPF -3dB frequency is 10kHz and my HPF's -3dB frequency is 5kHz... is it the way im connecting (...)

Electronic Elementary Questions :: 05-24-2010 06:35 :: Dion_Aus :: Replies: **3** :: Views: **1865**

Can't you look at the frequency response in Matlab. You've completely speced out the **filter** above (**3rd** **order**, D=256, CIC).

Analog Circuit Design :: 05-25-2010 21:23 :: RBB :: Replies: **2** :: Views: **1302**

Hello all,
I need to design a IIR 2nd **order** notch **filter** with notching frequency of 50 Hz. & 500 Hz as sampling rate.
Matlab HDL code generator is not generating the code.
can anyone suggest me something or provide me a VHDL code for the same.
thanks in advance

Digital Signal Processing :: 07-20-2010 01:17 :: shhrikant1 :: Replies: **0** :: Views: **1445**

Hello,
Iam designing 6th **order** butherworth LPF and need help in solving equations like how to calculate Rs and Cs of each stage and what specifications we need to consider for OTA.
Bye

Analog Circuit Design :: 08-23-2010 00:20 :: coolstuff07 :: Replies: **11** :: Views: **943**

Do you think there is an implementational cost difference between a 4th **order** biquad and a 8th **order** **butterworth**? If i say that, more or less, i need 2 integrating capacitor per pole, then i need the same for both. Is there any application where a biquad is prefereable to a buttenworth??
Thank you very much.

Electronic Elementary Questions :: 09-04-2010 17:11 :: joeDiHare :: Replies: **0** :: Views: **747**

Without a series resistor, the DAC output would show a strong non-linearity. To reduce the PWM ripple effectively without inacceptable response time, a 2nd or **3rd** **order** **butterworth** low-pass (using one buffer OP) is preferable. The buffer also allows to reduce the **filter** capacitor size to < 1 uF and use high quality capacitors.

Microcontrollers :: 11-05-2010 19:14 :: FvM :: Replies: **7** :: Views: **1119**

Dear All,
Does anybody have any experience such that while designing an Sallen-key active **filter** you encountered a situation like this -
I. I am simulating a 2nd **order** **butterworth** **filter** designed using SK topology.
II. using ideal opamp I ma getting accurate transfer characteristic - i.e. calculated complex-conjugate (...)

Analog Circuit Design :: 11-09-2010 10:56 :: samiran_dam :: Replies: **0** :: Views: **437**

Dear all,
I want to ask a simple question:
Why high **order** active **filter** can violate Barkhausen's criteria?
For instance, if want to design a third-**order** low pass active **filter**, there will
be three integrators in the loop. In other words, the phase margin is easily less
than 0 degree.
When we design an active (...)

Analog Circuit Design :: 11-11-2010 14:33 :: Mauder :: Replies: **2** :: Views: **778**

Electronic Circuit Collection: Scratch and Rumble **filter** circuit and description
The above link shows a circuit that I am trying to redesign using a more readily accessable transister. Therefore I am try to getthe jist of how it was designed. I tried to dev

Hobby Circuits and Small Projects Problems :: 11-22-2010 16:57 :: obrien135 :: Replies: **8** :: Views: **1394**

Hi, i want to learn about **3rd**-**order** Compression Point (IP3) & RF amplifiers in general ,Im a beginner in RF field..Can somebody recommend me some good books to start with??
Thanks n Regards

RF, Microwave, Antennas and Optics :: 12-26-2010 08:53 :: themaccabee :: Replies: **1** :: Views: **597**

Hey gentlemans!
Hi
I need a simple way to high **order** passive **filter** design.
Is here any idea?
With appreciate
Goldsmith

Analog Circuit Design :: 08-20-2011 11:29 :: goldsmith :: Replies: **6** :: Views: **839**

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