62 Threads found on edaboard.com: Biquad Filter
How many kind of method to make biquad filter?for example,continue time ,mosfet-c,digital filter,inductor.
Analog IC Design and Layout :: 02.12.2006 11:01 :: yellff :: Replies: 0 :: Views: 563
Does any one know what are the Tschebyscheff coefficient for the biquad filter?
Analog Circuit Design :: 06.09.2007 02:05 :: rinaishlene :: Replies: 0 :: Views: 554
I'm working on a class project designing a low pass biquad filter with gain 2 and cut off frequency of 1kHz that follows the 3dB Chebyschev characteristics.From the simulation using PSpice,the circuit that we designed worked perfectly...but when we installed all the components on the breadboard and run the test using function generator and
Analog Circuit Design :: 26.09.2007 09:50 :: rinaishlene :: Replies: 4 :: Views: 823
what is a biquad filter,i saw this when iam reading SC-filters
Analog Circuit Design :: 28.09.2007 08:11 :: vinodkumar :: Replies: 2 :: Views: 846
Hi, everyone, I want to design a two-thomas biquad filter with 1.2MHz cutoff frequency. But how to compute the value of the passive components(R, C)?And by the way, who have the two papers about filters?
L. C. Thomas, The biquad: Part I - Some Practical Design Considerations
sALLEN KEY , A practical method of designing Rc (...)
Analog Circuit Design :: 24.08.2009 04:42 :: lily1981216 :: Replies: 8 :: Views: 3336
Would like to ask if I can implement a notch filter using a KHN biquad filter (state variable), something like this at page 8. Meaning this would use
Analog Circuit Design :: 28.09.2011 02:08 :: CaptainSpock :: Replies: 1 :: Views: 1008
is anybody out there to provide me w/ some paper w/ respect to design and analysis of active RC biquad filters (e.g. CMOS implementation) and digital biquad filters realization. Should help to judge different types of implementation (analog vs. digital).
tia & br
RF, Microwave, Antennas and Optics :: 02.01.2003 10:20 :: muppettoon :: Replies: 0 :: Views: 1690
Here is a bandpass filter with a higH Q biquad architecture, and this is from Allen's notes.
Obviously, this biquad contains a charge amplifier(the first stage) and a noninverting SC integrator,plus a switched capacitor and a capacitor as feedback into input.
I think this filter has no gain. In the first (...)
Analog Circuit Design :: 17.07.2007 05:35 :: skythunder :: Replies: 0 :: Views: 1137
I will be using VHDL\Verilog Code to simulate the function the datapath proposed in this paper
"A New hardware Realization of Digital filter"
By ABRAHAM PELED and BEDE LIU
IEEE Transaction on Acoustics,Speech and Signal Processing,DEC 1974
Here I attached the diagram of the datapath
My question is
1)Is it appropriate to use two 2-bi
PLD, SPLD, GAL, CPLD, FPGA Design :: 29.08.2007 11:24 :: rinaishlene :: Replies: 0 :: Views: 729
I would like to for ask for any opinion regarding what kind of input that I should trigger (either Vsin or VAC)in PSpice to generate the frequency response of the biquad filter?
And how much the value of the input voltage that should be used?
Analog Circuit Design :: 04.09.2007 10:43 :: rinaishlene :: Replies: 0 :: Views: 680
I'm designing a fourth order filter by designing 2 biquad filters in cascade . can any one tell me how i can calculate the effective frequency band wo of the filter and also the effective quality factor Q based on wo, Q of each biquad section.
If there is any PDF describe this phenomena this (...)
Analog Circuit Design :: 11.04.2009 07:11 :: aibrahim :: Replies: 4 :: Views: 2466
I have an FRS demo model,..on receiver side there is decimation and filtering , for that Direct Form 2 SOS filters have been used, i am unable to understand its working :( and after decimation , channelizer block with IIR biquad filters is used...these models are in made Simulink using System Generator blocksets,...can (...)
Digital Signal Processing :: 19.08.2009 03:31 :: aliumair926 :: Replies: 3 :: Views: 951
Hello everybody, I'm designing a fully differential switched capacitor biquad filter with switching frequency of 1.33 MHz (actually two non-overlapping clocks). When analyzing the ideal circuit (constructed with ideal switches from analogLib and all others elements plus ideal fully differential opamp model constructed from me with vcvs) I should do
Analog IC Design and Layout :: 16.05.2010 10:34 :: leon30 :: Replies: 2 :: Views: 1396
I once made a filter for the same purpose: emphasize a single morse code signal amid a mix of other keyers.
I decided on a biquad bandpass filter. It used 3/4 of a 324 quad op amp, plus a few caps and resistors. Fixed frequency around 600 hz. Worked well. To get optimum response I only needed to turn the BFO knob on my SW radio, to match (...)
Analog IC Design and Layout :: 04.10.2011 23:14 :: BradtheRad :: Replies: 3 :: Views: 691
Linear recursive filter design tools for IIR audio biquad filters in various modes.
Uploaded file: IIR Audio biquad filters.mht
Professional Hardware and Electronics Design :: 07.01.2002 08:06 :: Robin Hood :: Replies: 0 :: Views: 1485
Linear recursive filter design tools for IIR biquad gain equalizers.
Uploaded file: IIR biquad Gain Equalizer filters.mht
Professional Hardware and Electronics Design :: 07.01.2002 08:11 :: Robin Hood :: Replies: 0 :: Views: 1781
Linear recursive filter design tools for IIR biquad group delay equalizers.
Uploaded file: IIR biquad Group Delay Equalizer filters.mht
Please don't reply unless you have useful information to add on this post.Thanks
Any other replies a
Professional Hardware and Electronics Design :: 07.01.2002 08:17 :: Robin Hood :: Replies: 0 :: Views: 1970
I think we maker sure , first , delta-sigma A/D or D/A
use "over sample" & "noise shaping"
we use over sample by modulator (a comparator) and delta-signma
modulator have 1/2/3 ..order ( hi order will unstable but over sample is small , ex. if you use 2 order , you need x256 sample , if you
input signal=1M , you need a 256M c
RF, Microwave, Antennas and Optics :: 29.12.2003 05:50 :: andy2000a :: Replies: 4 :: Views: 1470
These two filters from djalli are dificult for realisation because of .4pF and 409Mohm in first circuit and a need for precise capacitors in second (can be solved using trimers) but 409Mohm seems impossible. I think biquad is simpler and realizable.
Electronic Elementary Questions :: 13.10.2004 05:59 :: Borber :: Replies: 30 :: Views: 5892
as I know , delta-sigma A/D have 2 block , 1 is analopg modulator
it is easy implement by comparator -> use 1/2/3 order over sample
and 2 is digital filter , I think many analog design book already talk about
how to make delta-sigma modulator , but really deisgn flow is
(1) use C or matlab or saber simulation behavior equation about del
Analog Circuit Design :: 02.02.2005 18:32 :: andy2000a :: Replies: 178 :: Views: 55251
I recently built a switched-capacitor biquadratic building block for a high order lowpass was a lowpass notch biquad. I tested it out with Spectre. The result showed good dc gain and high frequecy gain as expected. However, the pole and zero locations deviated a lot from the expected values. And the transition was not as sharp
Analog Circuit Design :: 14.02.2005 19:58 :: shyboy :: Replies: 6 :: Views: 1113
For 1, I think we should also consider the power dissipation or other spec. I prefer biquad since you implemented filter in sc filter.
For 2, I think discrete time domain will give you similar result with continous time domain, and the accurate response maybe need to be verified in transient .
For 3,4 . I think it depends on ur opamp (...)
Analog IC Design and Layout :: 11.07.2005 10:45 :: ablue :: Replies: 9 :: Views: 1012
This is a Active biquad Sallen-Key Low-Pass filter.
The equations to find the poles, wp and Qp are being taught in Berkeley's EE247 ADC class. Please refer to the lecture note:
Analog Circuit Design :: 09.03.2006 16:54 :: jlee :: Replies: 6 :: Views: 1175
I need some help for building A/D converter using Switched Capacitor techniques and the filter is the standard biquad filter... try to help me in this regard..
Analog Circuit Design :: 07.06.2006 10:44 :: srinivasan :: Replies: 0 :: Views: 421
hi,all.who know the difference of the leapfrop and two opamp biqua filter,
at the energy,groupdelay,noise and gain ripple
Added after 31 minutes:
who know the difference of the two filter.
In my opion,leapfrop is better than biquad at gainripple,noise and energy,but is bad at groupdelay.
Analog Circuit Design :: 17.07.2006 23:18 :: babuli :: Replies: 2 :: Views: 437
I think you can implement biquad by add a simple CPU into FPGA.
Digital Signal Processing :: 12.10.2006 14:34 :: whicun :: Replies: 1 :: Views: 898
The authors describe how triple-output
OTAs facilitate the development of a new
current-mode universal biquad configuration
capable of generating various filter transfer
functions using digitally programmable zeros.
This is achieved without excessive use of active
devices and without changing the biquad
topology. The (...)
Analog IC Design and Layout :: 14.10.2006 00:18 :: benever :: Replies: 0 :: Views: 730
I gotta some question about multi-feedback circuits stability.
Generally, single feed-back circuits are relatively easy to estimate and simulate
But it's very confusing to me that multi-feed back circuits stability such as attached
biquad filter circuits.
Normally, In transient analysis you can give the impulse fu
Analog Circuit Design :: 01.11.2006 20:19 :: Y.C Park :: Replies: 4 :: Views: 1491
actually in verilog IIR is working but same program in vhdl is not working is a 4 tap IIR filter
have u generated through matlab....?
how is it 4 tap? cos matlab gives it as biquad sections.
is it 4'th order...?
is it the netlist not working or the simulation?
how did u decide it is not wo
PLD, SPLD, GAL, CPLD, FPGA Design :: 26.05.2007 12:27 :: rsrinivas :: Replies: 6 :: Views: 1583
All is correct
trying to convert second row to decimal representation:
1 1 0 0 0 1 0 1
Result is correct
Actually result in the paper you studying, can be regarded
Digital Signal Processing :: 22.08.2007 08:46 :: vadkudr :: Replies: 4 :: Views: 883
Hello everyone,I'm designing a CMOS lowpass filter.Because the bandwidth of input signal is less than 2MHz,I choose the active RC filter type. A 4th order filter can be built by cascading two biquad blocks which every biquad contains two full differential OPA.I use capacitance array controlled by 4 bits (...)
Analog IC Design and Layout :: 09.10.2007 08:02 :: hsez :: Replies: 2 :: Views: 589
i need urgently to calculate transfer function of this "second biquad bandpass
Analog Circuit Design :: 15.02.2008 11:19 :: aminmahdi :: Replies: 0 :: Views: 603
i am designing an activeRC filter , and
how to simulate the stability of the TOM-THOMAS biquad ?
or it is stabled if the opamps in it have enough phase margin.
thanks very much.
Analog Circuit Design :: 07.08.2008 12:07 :: viyag :: Replies: 4 :: Views: 1145
I'm designing a five-order chebyshev LPF. Three subckts cascaded to compose the filter, a one-order one and two biquads. There are five operational amplifiers. How to give out the specifications of these opamps? I'm confusing all these days!
Analog Circuit Design :: 22.08.2008 23:00 :: jianjing526 :: Replies: 9 :: Views: 647
hello, i would like to ask the stability problem of my gm-c filter, thank you very much for your hlep^^
filter type: 4th order biquad gm-c bandpass filter
center frequency: 900MHz
my way to test stability is use "trans simulation", after check, is it not oscillate.
but this (...)
Analog Circuit Design :: 09.09.2008 23:24 :: yixiusky :: Replies: 0 :: Views: 738
I designed two Gm-C low-pass biquad filters by using only folded-cascode and telescopic-cascode OTAs for the each biquad.
THD of the telescopic-cascode based filter is much much more than of folded-cascode based filter.
I was expecting telescopic-based would have less THD!
I wonder if my (...)
Analog Circuit Design :: 24.07.2009 19:25 :: karakurto :: Replies: 0 :: Views: 447
I am designing an active continuous time filter and i have chosen a Tow-Thomas biquad to realize my question is the following :
During the design of the opamp and the simulation procedure via cadence spectre,which is the proper load capacitance that i should concider for my opamp circuit?? 1pF or 2pF sho
Analog IC Design and Layout :: 14.03.2010 12:26 :: LvW :: Replies: 15 :: Views: 2119
I need to find pspice models for active filters - biquad, single transistor or switched capacitor. Can anyone point me in the right direction.
Analog Circuit Design :: 04.04.2010 17:47 :: nmavulur :: Replies: 2 :: Views: 1061
Fcutoff = 120MHz
order = 4
mostly likely Gm-C filter implementation
either biquad connection or LC ladder simulation
is this something that can be done in 3 weeks?
Analog IC Design and Layout :: 09.06.2010 22:01 :: sharkies :: Replies: 1 :: Views: 443
Please anyone post the verilog code for biquad Low Pass filter.
Digital Signal Processing :: 25.08.2010 02:44 :: kishram4u :: Replies: 0 :: Views: 1245
What is the general trend of using opamp topology to implement biquad-filter? I mean, is two-stage or cascode or folded-cascode opamp being used? How I can reduce the output impedance factor?
Analog Circuit Design :: 30.10.2010 04:01 :: samiran_dam :: Replies: 3 :: Views: 773
I understand "source follower" as a synonymous of positive SAB (single amplifier biquad) with a gain of 1. Using a single transistor or an OP would of course affect the gain precision and thus the filter characteristic. For a "low Q", e.g butterworth filter, a small gain change won't matter much.
The intended method to get a programmable (...)
Analog IC Design and Layout :: 10.02.2011 04:24 :: FvM :: Replies: 5 :: Views: 884
There are several alternatives - mostly based on multi-amplifier biquad (state variable) design.
One simple method is given in the pdf attachement.
Bandpass: Vin,1=Vin,3=0 (grounded) and Vout/Vin,2=bandpass response.
But note that the output requires a buffer amplifier (with voltage output).
Note also: The given circuit is of 2nd order. By defin
Electronic Elementary Questions :: 22.02.2011 07:01 :: LvW :: Replies: 2 :: Views: 574
I have designed a prototype active-RC filter that reaches my specs with ideal opamp models.When i substitute the ideal opamps with 1-pole models the transfer function deviates from the ideal behavior as it is there any fast way (via software that does it automatically or something else without trial and error with cadence
Analog IC Design and Layout :: 28.02.2011 11:41 :: jimito13 :: Replies: 9 :: Views: 798
I encountered a problem when I designed a switched capacitor biquad filter. First of all I designed a switched capacitor integrator. One of problems in the SC integrator is that how to give the biasing point of amplifier to make it work properly. As in the attachment, if the clock frequency is too slow, in one phase that the inp
Analog Circuit Design :: 07.08.2011 11:54 :: sharezhao :: Replies: 1 :: Views: 778
I am trying to design a 6th order lowpass chebyshev filter (as a cascade of three 2nd-order biquad sections)
with following specifics:
so i choose flaischer-laker biquad (pag 48 of this pdf)
and i follow
Analog Circuit Design :: 20.09.2011 06:16 :: lorenzo21 :: Replies: 0 :: Views: 878
An op amp in configuration with any of the above. Sallen Key topology. Allows capacitors and resistors to yield a steeper rolloff curve than they would without the op amp.
Second order or higher is known as Multiple feedback topology. This may be easiest to construct since capacitors are easy to switch (whereas coils re
Electronic Elementary Questions :: 23.11.2011 03:04 :: LvW :: Replies: 4 :: Views: 470
I've designed a biquad IIR filter, and I would like to quantize the filter coefficients so that the difference equation can be used in a fixed-point FPGA code written in Verilog. The filter input ranges between 0 and ((2^12) -1) fixed-point values. The difference equation is Direct Form I ( ), an
PLD, SPLD, GAL, CPLD, FPGA Design :: 04.03.2012 14:23 :: nkinar :: Replies: 3 :: Views: 2022
Q is a property of a second order filter (or "biquad"). There's no thing like a "Q value of the whole filter". Instead, the combination of individual Q and center frequency values makes the filter characteristic.
Can you clarify, which meaning of the "overall Q value" is discussed in these books?
Analog IC Design and Layout :: 14.04.2012 17:04 :: FvM :: Replies: 4 :: Views: 297
You can see this material:Simulating Switched-Capacitor filters with SpectreRF~I designed one 4th order switched capacitor biquad filter in UMC 180 nm technology using cadence software (version 5.10.41).This circuit is operating on a two phase non overlapping clock generator (i/p frequency = 1 kHz). To simulate this circui
Analog IC Design and Layout :: 20.10.2012 22:19 :: superleaf :: Replies: 1 :: Views: 521