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Voltage controlled filter concept........



 
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Learner



Joined: 01 Nov 2004
Posts: 143
Helped: 2
Location: Area 621.xxx
Post15 Nov 2004 16:48   Voltage controlled filter concept........
Hi guys,
I was wondering if anyone can direct a source of learning about voltage controlled filters?

I understand that op amp filters ultilize capacitors and resistors to create phase shift between current and voltage of different frequency to generate the filter output response, however I havent been able to find books about using voltage to change the filter cut off frequency.

Can anyone shed a light or direct a link to this?

Thanks!
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Johnson



Joined: 04 Oct 2004
Posts: 724
Helped: 22
Post15 Nov 2004 18:04   Re: Voltage controlled filter concept........
Based on freq. range the Switch Capacitor is another way to have voltage controlled filters.
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