How many poles? Maybe you can use a switched capacitor filter like this: https://www.ti.com/lit/ds/symlink/mf10-n.pdfHi all
I need to design a band pass filter of 14 KHz bandwidth (3dB) such that its centre frequency can be varied from 80 KHz to 900 KHz by some means e.g. tuning voltage. Is there any commercial IC available for such application? If not, how can i design voltage controlled band pass filter using discrete components?
Will MF10 work for frequency ranges up to 500 KHz?The MF10 is not suitable for OP design requirements @ 900 Khz.
A constant BW of 14 KHz is required in filter with linear phase.OP : Do you want cosnata Q or consta BW in the filter ? Maximally flat or
linear phase ? Ripple ? You need to post a more complete description.
MF10 is good up to 30kHz, according to the data sheetWill MF10 work for frequency ranges up to 500 KHz?
A constant BW of 14 KHz is required in filter with linear phase.
Thats correct, it was an example, not a solution. OP has to adapt and do theirGreat find there Dana.
But it does not have 14Khz wide flat (3db) bandwidth the original poster specified.
Check out the H11F1 optically isolated floating fet "resistor".
https://pdf1.alldatasheet.com/datasheet-pdf/view/52729/FAIRCHILD/H11F1.html
This may hold some possibilities, I really do not know.
I once built a voltage controlled oscillator using one of these, a capacitor and a 74HC14 inverter.
It was continuously tunable from a very few Hz to several Mhz.
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