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62 Threads found on Biquad Filter
How many kind of method to make biquad filter?for example,continue time ,mosfet-c,digital filter,inductor.
Hi Does any one know what are the Tschebyscheff coefficient for the biquad filter? Rina
Hi, 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
Hi what is a biquad filter,i saw this when iam reading SC-filters byee
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 (...)
Hi 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
Hi together, 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 muppettoon
Hi,all, 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 (...)
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
Hi, 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? Rina
Hello all, 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 (...)
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 (...)
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
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 (...)
Linear recursive filter design tools for IIR audio biquad filters in various modes. Uploaded file: IIR Audio biquad filters.mht
Linear recursive filter design tools for IIR biquad gain equalizers. Uploaded file: IIR biquad Gain Equalizer filters.mht
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
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
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.
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
Hi, all, 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
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 (...)
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: Slide #4.
Hi all, 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..
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. [color=
Hi all, I have a problem. I am into designing an array of bandpass filters so that it forms a filter bank. I have designed the filter in matlab using fdatool and generated the hdl (verilog) code from's a 6'th order bpf with 3 biquads(IIR Butterworth). pls do let me know that if i can reuse this (...)
Abstract: 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 (...)
HI Expert!!! I gotta some question about multi-feedback circuits stability. Generally, single feed-back circuits are relatively easy to estimate and simulate stability. 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
hi all, 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
All is correct for example trying to convert second row to decimal representation: >> gg(2,:) ans = 1 1 0 0 0 1 0 1 >> -(2^7-gg(2,2:end)*2.^')/2^7*2 ans = -0.9219 and >> phiphi(2) ans = -0.9129 >> Result is correct Actually result in the paper you studying, can be regarded
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 (...)
hi i need urgently to calculate transfer function of this "second biquad bandpass thanks.
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.
hi all, 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!
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 bandwidth:40MHz my way to test stability is use "trans simulation", after check, is it not oscillate. but this (...)
Hi, 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 (...)
Hello all, 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
Hi, I need to find pspice models for active filters - biquad, single transistor or switched capacitor. Can anyone point me in the right direction.
lowpass, Fcutoff = 120MHz order = 4 mostly likely Gm-C filter implementation either biquad connection or LC ladder simulation process: 90nm is this something that can be done in 3 weeks?
Please anyone post the verilog code for biquad Low Pass filter.
Hi samiran_dam, The basic component of an active filter in majority,is an operational amplifier.Based on the specs you are given for your filter you must reduce your implementation procedure to the estimation of the opamp specs that will give a robust filter design.So,you can start your biquad design with a 1-pole opamp (...)
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 (...)
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
Hello all, 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
Dear all: 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
Hi all, I am trying to design a 6th order lowpass chebyshev filter (as a cascade of three 2nd-order biquad sections) with following specifics: Amax=0.1dB f(3db)=2.2 Mhz F(clock)=100Mhz 1.8V so i choose flaischer-laker biquad (pag 48 of this pdf) and i follow
1. The simplest method is a high-frequency diverter. Install a capacitor to ground. To select the value it depends on surrounding impedances. First order. Low Q. Gradual rolloff curve. May be unsatisfactory. 2. A Pi design gives a steeper rolloff curve. Two capacitors with a resistor in between. 3. A coil in series. To select the
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
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?
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