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What is Passband ripple?
The ideal passband of a receiver should have steep sides and a flat top. However many receivers use stacked filters to create the passband, and consequently the top of the passband sometimes has a ripple on it. This can cause distortion of the received signal.
What are the disadvantages of passive filters?
» There is no isolation b/w input and output. » These circuits can not provide any gain. » There is always someloss of signal, It can be in the passband. » Circuit becomes bulky if inductors are used. » There is no clear demarcation between Passband and stopband but actually it (Passband & Stopband) get mixed up. » In this frequency response is not sharp as no sudden change in the output when switching from passband to stopband. » Source loading can take place.
Will light pass through two successive colour filters?
Yes, if the passband of the first filter includes that of the second one, and the light contains wavelengths that fall within their common passband.
Name different types of filter circuits.?
band passband rejectlow passhigh passcombetc.RCRLLCRLCetc.
How do you convert the passband frequency into baseband frequency the range of 2Ghz passband?
Use the shifting property of the Fourier transform to shift the frequency response down to baseband. Multiply the time-domain signal by a complex exponential with the frequency of the amount you want to shift the frequency response.
What type of filter attenuates all frequencies above and below a specified passband?
Band-Pass filters
Advantages and disadvantages of butterworth filter?
Advantage is that it has the most flat passband meaning that it is very good at simulating the passband of an ideal filter. The disadvantage is that it has a horrible stopband because it gradually goes to zero so some parts of the stopband are still passed. However, for an nth-order Butterworth Filter, as n increases, the closer it is to an ideal filter. However, it is highly impractical to build a ridiculously high order Butterworth filter.
What has the author Harold Lee Broberg written?
Harold Lee Broberg has written: 'A three-pole analog cancellation filter with variable passband for use in range-gated radars'
Why you take cutoff freqency at 3dB?
3 dB implies 1/2 the power and since the power is proportional to the square of voltage, the voltage will be 0,707 of the passband voltage. sqrt(0.5) = 0.707
What is adjacent cell interference?
when imperfect receiver filter allow nearby frequencies to leak into the passband the interference produced is call adjacent channel interference Engr Aamir Naeem facebook id: Aamirnaeem77@gmail.com
What is the main characteristics of chebyshev filter?
It minimizes the error between the idealized and the actual filter characteristics over the range of filter, but with the ripples in the passband.Note:Butterworth filter does not give the sufficiently good approximation across the complete passband in many cases. And the Taylor's series is often not suited to the way specifications are given to the filter.For the IIR filter, the Chebyshev error is minimized over the passband and a Taylor's series approximation atis used to determine the stopband performance. This mixture of methods in the IIR case is called the Chebyshev filter
Are there any non-butterworth implementations of Linkwitz-Riley Crossover arrangement?
It depends on how you look at it; the Butterworth filter is probably the only filter with absolutely flat response in the passband, and the knees/slopes of the filters of the Butterworth filters add upp more or less perfectly at the crossover (for example in a loudspeaker filter). The Linkwitz-Riley is built up through putting two filters in cascade, and it has an absolutely flat passband. As soon as you find a filter that can be arranged in cascade and that has an absolutely flat passband; you're there! And when/if you're "there", you will probably come to the conclusion that the filter you found turned out to be a Butterworth... =/ Some might yell out: "what about ChebyshevII?" Well, that one does not have that smooth knee of the Butterworth, and it has the stopband ripple that has to be taken into account. Here's an idea: Throw together two Chebyshevs in cascade (series) and find a good motivation to why it's a good filter, and you can name it after yourself. Sick but true!
