Amplifying Function Generator Outputs

I forgot to add, i actually like to boast the output power of the signal generator which can able to generate up to 2.0Mhz, with 10Vpk-pk

Are you looking for voltage gain or power gain?

im looking for power gain,can i do it by using op amp?

How much power gain?

The signal generated is not modulated,im hoping to amplify the power by 10 times

If 10 times gain is not possible ,5 should be alright as well

Ten times what power? You understand power gain, yes? As in 100 x 1 watt = 100 watts of Power Gain.

This is beginning to feel like 'Twenty Questions.' Out with it, dude!

What do you need? 1 watt? 10 watts? 100 watts? A megawatt? Ten megawatts? All of these power levels are possible, albeit not all by means of op-amps!

Tell us what you need, but please don't couch it in relative terms, because we haven't one clue in Hades as what the power output of your function generator might possibly be, and you're not saying. If your function generator does 100 milliwatts and you need 1000 watts for your project, that tells us what the power gain has to be. See?

Look, if you want info, you gotta give at least enough info to make that possible. 'K?

im sorry for not stating it clearly,i wan an output of 1W or if possible 2 W but i hav no idea how to find out the output power of the function generator,all the info i get from the data sheet of the function generator is it can generate up to 2Mhz and the max output is 10V pk-pk.Thx for all ur reply

If your function generator is of commercial make, you could tell us what make and model it is. That would be very helpful because we can see what the manufacturer has to say about it.

If you built your FG yourself, you could tell us what the output stage consists of. Like, maybe an 8038 chip, for example. Or a 555 timer. Or whatever.

Usually, commercial FGs have a 50-ohm output impedance and can source thus-and-so volts or, more commonly, a maximum of so many dB. From that we can determine the power output of your FG or, at least, come pretty close.

It's not necessary, however, because we now know, in absolute terms, how much power you need. Your FG cranks out at least 5 volts, non? Maybe 10? 15? Actually, the problem (and not much of one, really) is finding a suitable amplifier that is small enough. Finding lots of power is no problem, because that's what They want to sell you. Apex, for instance, makes a 500-watt op amp. With two of them, you can make life utterly miserable for your next-door neighbors, depending on your musical tastes. And theirs. Whether Apex makes a power op-amp that will perform well at 2 MHz is another matter. Most of their products are used for lower-frequency applications like audio, servo amps, and so forth. But you could check with them, and I would if were you. Be warned that although their products are generally awesome - so are their prices.

For two watts you shouldn't have to pay much, though. Call or email 'em about their PA01, PA02 and so forth op amps and ask them what the 'gain/bandwidth product' is for those amps, and which amps, if any, will do the job.

Another company is Maxim. And another one is Analog Devices. Others who visit this thread may have yet other vendors in mind for this sort of thing. Google all three mfrs. Also try National Semiconductor. Apex is part of Cirrus Semiconductor.

the model of the function generator im using is Instek GFG-8020H

http://www.testequipmentdepot.com/instek/signalgenerators/gfg-8020g.htm

This link can show u the datasheet. will it be easier if i built 1 with a 555 timer?

Re-read my previous post. I was adding to it when you responded.

Why a 555 timer this is a square wave output? If you have a function generator you will need to amplify different waveforms.

Randel has shown you an ideal amplifier to build on it has a much higher performance than your function generator.

Hang on a minute:-

10Vp-p (into 50Ω load)

I make that exactly 1 Watt (for a sine wave).

i didn't notice that.Randall,does this means when i put my load at the 50ohm out put it will still gives me 1W?(since energy cant be create )

Yes:-

Think of the output as being an infinite (current) source with a 50Ω resistor in series. If you turn it up full and measure it with a high impedance meter or scope: you will see 20Vp-p. Put a 50Ω load on it and measure across the load and the signal is simply divided by two.

10 Vpp in 50 ohm load, gives you a 3.546 Vrms, which supplies, on the same 50 ohm load only 0.25W

Of course you're right, for some reason I read that as ±10Vp-p.

So back to chopper What are you really trying to achieve?

Who are you guest? And, why don't you sign up (painless and free).

actually im working on a project to built a inductive resonance wireless power transmission project. Im using the lab function generator to create my AC for my coil at certain frequency but now i found out the power is not strong enough for me to power up some equipment.

By the way, i saw some1 created a inverter using 555timer

http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=7123

in your opinion do u think i can manage to get the power of 1W or greater than 1W using this design(the 1st picture in the thread)?and i can use vary the frequency as well?

Without looking at the data sheet I don't know, but, I don't think the 555 will run fast enough for your application.

If the lab function generator is available: use that with a suitable amplifier.

In order to design anything you need to read through the data sheets, and, make sure that everything is being used in spec.: the fewer components in the design the simpler this is.

National LM6313

EDIT: Oh bugger: sorry that's obsolete!

LM7372 then

you don't need much power at all, you could try a cheap piezo driver...

meh, nm, couldn't find one that was cheap...

I have a very similar problem. I'm using a function generator which provides 4uA with ~3V P-P at 50kHz. I need to be able to amplify the current to at least around 1A. Which component(s) do I need to do this?