Search Engine www.edaboard.com

Filter Constant

Add Question

137 Threads found on edaboard.com: Filter Constant
It is important to select propper degre of compensation. There exists a degree of compensation where group delay and total delay is allmost constant up to the end of passband and is lower. It looks like realization of Gaussian filter. This degree of compensation does not give max increase of bandwidth but a little bit les and does not increase dela
Hi, There are two aspects of the problem: 1.)Every opamp has a parameter named GBW (Gain-Bandwidth product). Due to the fact that this product is constant, with the increase of the gain you'll found a corresponding decrease of the bandwidth. Usually the bandwith of an opamp is specified at unity gain. According to the datasheet, the LM741 has a
The gm cell work in open loop, there is a difference from opamp in close loop. for gm cell, you should check the frequency response in filter level
The placement depends on the response you want. For constant time delay with frequency, the poles are those of flat delay filters (Gaussian or Thompson) with mirror image zeros.
Band Pass filter: constant gain, phase linear with w. Phase no linear implies signal distortion (linear), group delay isn't constant with w.
I have a PLL transient simulation. When PLL is very likely locked,i.e.,loop filter voltage has less than 1mV ripple and after >10us settling. But look at the charge pump up/down current pulse I found there is a constant phase error(about the same big as the PFD delay chain's delay time) between the Fref and Fdiv. My charge pump has good Iup and
1. shape of 10MHz RBW filter is not "rectangular", it's gain is not constant over passband and the result is product of your signal bandwidth and the filter response. Your signal will be "weighted". 2. IF signal is single side band. 3. there is no best usage, speaking generally, it depends on what you want.
Accurate power measurement should be done with linear frequency characteristic over the spectrum bandwidth of signal. All spectrum components must be "weighted" with same constant. It is possible with wide bandwidth or square shaped one. Spectrum analyzer IF filter has something like sin^2 shape and can have different width (RBW). Measured result c
hi, i am working on the synchronisation of wireless ofdm system. i have used a low pass filter with group delay of 26. I want to know if i have to compensate the group delay in the time offset calculation for the positioning of the fft window. if anybody know, please help me.
I need some ideas , some schematics, for to realise a filter spike suppression 1us for I2C protocol. I don`t need RC filter because I loosing more space for layout. Morover, I made some schematics where I loaded a capacitor with constant curent. That schematic was good to obtain a positive puls forever when apeared anything transition (...)
I need some ideas , some schematics, for to realise a filter spike suppression 1us for I2C protocol. I don`t need RC filter because I loosing more space for layout. Morover, I made some schematics where I loaded a capacitor with constant curent. That schematic was good to obtain a positive puls forever when apeared anything transition (...)
Hi all especially microe ppl, i need ur help I'm implementing large time constant filter using pseudoresistor as in figure below. After simulation the incremental resistance is in the range of tera ohm. There is no biasing current for the transistor, therefore I believe both transistors work in weak inversion region. However, my prof says that the
Most filters are almost constant in the center and parabolic-like at the edges of the passband. You can easily calculate the delay from the phase of pole pairs. Then add the delays from all of the pole pairs of a filter. This is easily done with a spread sheet program.
when u see the transform of the impulse i.e. frequency domain u get a constant amplitude for all frequencies from -∞ to +∞. so when u pass an impulse to a filter by seeing the frequency domain u can say what type of filter, cutoff frequencies etc. try symon haykin's dsp. there r many books and links suggested in this forum. (...)
You have four options. 1. Make the bandwidth wider so that your desired frequency range is within the passband at the limits of etching errors. 2. Use a lower dielectric constant material. This will increase the dimensions and the etching errors will be a smaller fraction of the dimensions. 3. Try some other filter topology that might
I don't think you can build this filter on-chip by any continuous-time filtering: just think about the extremely large time constant needed (i.e. 30Hz!). You may get away by doing switch-cap filter, but this definitely defies your purpose of power supply filtering. I bet the system spec you have is not (...)
Rectify the signal using a precision rectifier and pass it through a LP filter. The time constant of the filter gives you the averaging time. Make simulations in Matlab and compare it to the what you obtain from the circuit simulator. The result is not the "exact" average but very close to it. Another solution is to sample the signal, (...)
This looks like a two pole active filter. Look at the design equations for the components that affect the real and imaginary (or the natural frequency and damping) parts of the poles.
I remeber the rule of thumb is Tr=0.35/BW and it's related to the first order low pass filter and the time constant. You may get some ideas from the principle of communication wrote by Zemer.
FM radio uses audio frequencies up to 15kHz. You may use 15kHz low pass filter or simple series or parallel LC notch for 19kHz. Notch will supress pilot at least 30dB.