Generating signal, varying amplitude & frequency: 0-4 kHz
Generating signal, varying amplitude & frequency: 0-4 kHz
(OP)
I need to generate signals with varying amplitude and frequency ( 0 - 4 kHz) on a circuit without the use of an external signal generator / oscilloscope. There is also the aspect of frequency stability and accuracy; which in my case is extremely important. I`ve been loking into various VCO / VCXO`s but was unable to find any in my frequency range / spec`s.
I case you wondered: This is to simulate the rotational speed and vibration of a turbine blade.
Any suggestion would be greatly appreciated !
I case you wondered: This is to simulate the rotational speed and vibration of a turbine blade.
Any suggestion would be greatly appreciated !





RE: Generating signal, varying amplitude & frequency: 0-4 kHz
RE: Generating signal, varying amplitude & frequency: 0-4 kHz
RE: Generating signal, varying amplitude & frequency: 0-4 kHz
RE: Generating signal, varying amplitude & frequency: 0-4 kHz
http://www.intersil.com/data/an/an013.pdf
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Start each day with a smile. Get it over with.
RE: Generating signal, varying amplitude & frequency: 0-4 kHz
RE: Generating signal, varying amplitude & frequency: 0-4 kHz
itsmoked; by micros - do you mean micro controllers ? If possible please elborate.
ScottyUK; that was exactly what I was looking for, thanks a lot :)
(Although not the one you pointed to; it is for some reason not recommended for new designs ? - http://www.intersil.com/data/FN/FN2864.pdf)
did find this one though; http:
RE: Generating signal, varying amplitude & frequency: 0-4 kHz
The ones I've played with (years ago) can do arbitrary frequencies and sweeps as well as notes.
The biggest issue might be that they're sort-of 1980s and there might not be as many to choose from these days. But MIDI is still going strong so they're out there.
RE: Generating signal, varying amplitude & frequency: 0-4 kHz
You might try the Exar XR8038 if the Intersil chip is hard to find.
Both are still available, but I guess it has been EOL'd by Intersil and production is being ramped down. OK for a one-off, but buy a handful of IC's in case one fails in service.
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Start each day with a smile. Get it over with.
RE: Generating signal, varying amplitude & frequency: 0-4 kHz
Yes I meant microprocessor. The 4kHz you need is easy for a micro running at 4 or 8 or 20Mhz. If you said you needed 100kHz I would maybe think harder about a micro doing the job but might still use one to coordinate whatever other solution I reached for. But actually the new DSP micros could even handle that with out much problem.
A lot of designers are thinking this way. That is why chips as offered by others here are starting to disappear. Since designs now need micros for ohter desired features they just use the micros for sine-wave synthesis.
Micros are sooo flexible. I always grab for them.
They come with PWM blocks that can be used to create sine waves and triangles and squares and pulse trains and sweeps, etc, etc. And they automatically provide other stuff you end up needing but didn't think of earlier like; synchronization, start, stop, timing, delays, monitoring and indication.
Here is an example application note on generating DTMF tones (harder than your requirement) using a simple micro.
http://
RE: Generating signal, varying amplitude & frequency: 0-4 kHz