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49 Threads found on edaboard.com: Biquad Filter
To make it a complete chebychev filter specification, you need to add passband ripple and stop band attenuation. Order can be only determined from this specification. Q is a parameter of the second order filter building block ("biquad") not the filter itself. A chebychev filter is comprised of multiple (...)
That biquad filter will give much more information if each of its outputs drives an LM3915 bargraph IC with 10 LEDs.
Hi all Does anyone know why Tow-Thomas biquad casode two op-am and make R as a feedback? What is the point there? For example, why can not make it two seperate first order filter cascade together to get a second order filter? Does any have explanation here? Thanks a lot
I have designed a low pass biquad for cutoff 14Hz. I have done its dft and thd. I got thd 125.814. What does this value mean. In the help guide of cadence calculator, it say the formula returns voltage percentage. Please help me to understand this. With dft I got the follpwing graph 124160 When I use the log scale I
I have designed a biquad OTA-C low pass filter, tunable from frequency from a few Hz to few KHz. However if I increase the tuning current, although the frequency increases but the dc gain decreases. Please help me to understand why this could be happening and what could be the possible solution for this. Thanks in advance.[/
Currently I am working on designing an OPA with CMOS 0.18um process for Tow-thomas biquad Active filter. In order to increase BW, I am thinking of using a simple “single stage CS amplifier (i.e. w/o adding the Class-A or AB output buffer). Is it OK? Will it be any problems? Is there other better solutions?
Anyone could show me the biquad graph sample. please ? I had found on this link... But anyone had use this fillter on
i have designed a Gm-C BPF, biquad type with two OTA and two Cap. i set gm1=gm2=gm=13uS (low power design), C2=100*C1=1nF, f0=gm/sqrt(C1*C2)=20kHz, Q=sqrt(C2/C1)=10, now, the ac response shows that, f0 and Q has some deviation (20.4KHz and 9.23), what is the possible reason here? besides, for a Gm-C BPF, how is the transient response? does the
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
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?
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
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 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
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
Anyone had any success (in silicon) with the any of the various GOC switched cap CDS integrators? I am designing a biquad HP filter using the nagaraj style GOC integrators and the offset correction is not too impressive in simulation (I'm using Spectre for tran sims and SpectreRF for pac & pnoise). For example a standard SC integrator where b
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
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
Hi there, I have a project to design a 4th-order source follower lowpass filter for medical applications. Here are the specifications: 1. Supply Voltage: 2.5V 2. filter order: 4th-Order 3. Cutoff Frequency: 3kHz, 5kHz, 8kHz, 10kHz programmable 4. Power Consumption: <2mW 5. Design Tech: 0.35um CMOS I am using Cadence Vi
Please anyone post the verilog code for biquad Low Pass filter.
Hi, I need to find pspice models for active filters - biquad, single transistor or switched capacitor. Can anyone point me in the right direction.