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10 Threads found on Design An Active Bandpass Filter
This isn't actually an active bandpass, rather a passive LC filter followed by a gain stage, which simplifies calculations. Obviously you got the resonance frequency wrong, but that's no the only design problem. You should face the fact that it's almost impossible to achieve the intended Q of 400 for 6.8 MHz (...)
TI have a pretty good filter design tool you can download freely, I think some other vendors have similar tools
Hi Maryam, At first you should specify the order of filter ( How much rejection, do you need in certain offset from center frequency? by knowing that, the order of filter can be found). Also there are several types of filters such as butter worth, chebyshev and etc. Each type has certain properties. By assuming that you have found (...)
You can use OpAmp to design a filter, use ADS to simulate it. Why use ADS to simulate an active filter in the kHz range? There is a lot of free synthesis software for active filters, for example filterPro from Texas Instruments or filterlab from
I would suggest an analog filter. Look at TI filter Pro. active filter design Application - filterPRO - TI Software Folder . Keith.
I have to simulate the noise performances (with Spectre) of an active bandpass filter working up to 1.5 GHz. It's 50ohm input/output matched and what I do not understand is which noise analysis I must use. First, I used Noise analysis in Cadence and during the design I noticed clear noise improvement by choosing the right (...)
At those frequencies, a Chebycheff or Cauer type bandpass filter within an amplifer will be very proper.You can change the capacitor values by switching CMOS transistors that are digitally controlled.For more information, see active filter design methodologies.For inductances, you can use bonding wires and (...)
I have been trying to make an active bandpass filter of the Multiple Feedback type with a low Q, say 0.5, but for any Q less than 0.707 (1/root2) the design equations give nonsense resistor values. Is 0.707 the minimum Q possible with this configuration, and I am attempting the impossible? I have read all the (...)
For this frequency range you can build an active bandpass filter based on opamps. You will need two filters connected in series: lowpass and highpass. I hope you have a calculator, so here is the design and formulas: FR4 uses up to 8 layers, but I think can do it on 1
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