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voltage controlled bandpass filter
Hi guys,
I am looking to build a audio bandwidth spectrum analyzer and I am looking for a most compact/simple circuit that can do this eg. using a monolithic IC voltage controlled bandpass filter.
I have done a search on all the major semiconductor manufacturers but without any luck, all I have found are either clcok controlled or resistor controlled filters. Am I missing something here or that is really the only thing available?
I guess what I can do is to use digital potentiometer in replacement or the resistors or I could use a variable clock source to make the filter sweep controlling the Fc, either way I would need a variable clock source.
Which has lead me to the chip Max038 funtion generator, I am planning to use 2 of these chips in order to be able to generate a sweeping clock pulse. The first will have to generate a ramp wave in order to trigger the second chip which generates the clock pulse, however this is where I am stuck.....
I can not find any where in the data sheet that tells me how to gererate a ramp wave, can anyone help me out?
What are the other approaches that has been done since the birth of spectrum analyzer? Am I on the right track?
Any thoughts will be greatly appreciated!!
Datasheet removed, use this link instead:
hxxp://pdfserv.maxim-ic.com/en/ds/MAX038.pdf
/Cl
Hi guys,
I am looking to build a audio bandwidth spectrum analyzer and I am looking for a most compact/simple circuit that can do this eg. using a monolithic IC voltage controlled bandpass filter.
I have done a search on all the major semiconductor manufacturers but without any luck, all I have found are either clcok controlled or resistor controlled filters. Am I missing something here or that is really the only thing available?
I guess what I can do is to use digital potentiometer in replacement or the resistors or I could use a variable clock source to make the filter sweep controlling the Fc, either way I would need a variable clock source.
Which has lead me to the chip Max038 funtion generator, I am planning to use 2 of these chips in order to be able to generate a sweeping clock pulse. The first will have to generate a ramp wave in order to trigger the second chip which generates the clock pulse, however this is where I am stuck.....
I can not find any where in the data sheet that tells me how to gererate a ramp wave, can anyone help me out?
What are the other approaches that has been done since the birth of spectrum analyzer? Am I on the right track?
Any thoughts will be greatly appreciated!!
Datasheet removed, use this link instead:
hxxp://pdfserv.maxim-ic.com/en/ds/MAX038.pdf
/Cl