I have a function generator that gives out upto 10V (0.1Hz to 4MHz). Need to add a simple output stage to provide upto 50V for this bandwidth (will provide dedicated power supply). Any suggestions for the configuration?
** That sure ain't no basic electronic circuit yo are asking about.
Better try " sci.electronics.design".
Better be sure you REALLY need 50 volts at 4MHz cos it ain't gonna be cheap or simple.
....... Phil
Hi, Royal. Your prior newsgroup questions indicate you might be a bit of a newbie. Phil is right -- your output stage will be neiher cheap or simple. Not only that, but you didn't describe what your amplifier would be driving, and how much distortion would be permissible.
Evaluate what you want and where you want to go. If you just need a higher voltage for audio (say, for that 70V PA system you mentioned), why not just limit yourself to audio frequencies (say, 20Hz to 20KHz). You can then use any junker amp box made for this type of output (and you can frequently bridge dual-channel stuff to get the 70V output). This will almost certainly give you better results than you could get on your own.
Cheers Chris
You figure out what you need, and then make it.
Virtually nobody needs 50volts output over that full range. Few would be talking in terms of voltage.
Before you can find a solution, you actually need to know the problem.
If the problem is you need a signal at a specific frequency or range, then you add an amplifier that will do it. That means an audio amplifier if the range is actually audio. If it's the low RF range, then a broadband amplifier intended for low RF range. If you're lucky, what you really need is a small range of frequencies in the low RF range, and one could do it with a LC tuned amplifier at the required frequency.
You talk about a function generator, but have said nothing about what actual waveform you need this for. A general purpose amplifier, which isn't likely what you actually need, will be a different case from if you need a sinewave or squarewave.
ANd you've said nothing about power. Getting the voltage up to 50v is easy, but requiring anything much in the way of current will take more effort.
Michael
I've had pretty good luck with Apex PA08 (and others) high-voltage op amps.
The PA08 isn't fast (30V/us), but they have others that are (PA85).
...jerry
Use a transformer?
what output impedance do you need:
50V into 50 ohms at 4Mhz is a pretty respectible radio transmitter.-- Bye. Jasen
On 8 Sep 2006 07:57:37 GMT, in message , jasen scribed:
A possible solution if OP is interested only in small-signal voltage gain, and can take a minimum 1:5 hit on current. However, I have a sneaking suspicion that OP wants an overall power boost, in addition to the raised voltage. In which case, even something like this expensive little beast:
is limited to switching at max 80kHz. Like Michael said, "Before you can find a solution, you actually need to know the problem." So, OP, what is the problem, exactly?
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