You might want to take a look at the power op amps from Apex Microtechnology. They have several models which would easily meet your output current requirements and appear to be fast enough. Some of them are described as being suitable for driving motors or piezo drivers; they have built-in current limiting, inductive-kickback clamping diodes, and thermal shutoff.
The PA119 would be one possibility... 100 MHz gain-bandwidth product,
5 amp maximum output current ("within SOA"), 75-watt internal power dissipation limit. Supply voltage range from +/- 15 to +/- 40.
8-pin TO-3 case. Use a good heatsink :-)
Not cheap (about $300 in onesies) but it would be fairly straightforward solution. Some of their smaller, lower-power parts might suffice for your needs.
A similar device was previously discussed in this newsgroup. The best suggestion was a pair of LT1210 devices in the form of a bridge amplifier for 9 watts into 50 ohms to about 14 Mhz. Note that it's NOT DC coupled. Search Google Groups in this newsgroup for LT1210 .
Data sheet:
App Note. See Fig 70:
My tweaks:
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Jeff Liebermann jeffl@cruzio.com
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This looks like it could be done with available opamps, maybe a few in parallel at the output. THS6022 or some such. Or something discrete for slower but a bit more voltage swing.
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John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
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The most critical part of any design is the specification. And yours is beyond vague.
It's not unusual for customers to think vaguely about what they might need, then hedge their bets by asking for 10x that much. The difference between 10 and 20V might make a BIG difference in the cost of the devices. Ditto for 1 vs 10 MHz. And what does 10MHz. mean? Are you content with a 3dB bandwidth of 10MHz.? Or do you want competent square waves at 10MHz. rate? Transient response requirements? Linearity of the triangle? Flatness of a frequency sweep? Flatness of the top of a square wave? DC coupled? Voltage or current offset?
And how are you gonna get the signal to the load? Mismatched cables are not your friend.
It's been over 30 years since I designed a production function generator, but physics hasn't changed much since then. Meeting any few requirements is easy. Meeting all of them simultaneously in the same box is a bitch. "General purpose" only has meaning to the person who made the statement.
You need to be very clear about what you want.
Having said all that, I second the recommendation that you build complementary emitter followers. But there's art in even the simple approach. Thermal time constants can mess up the flatness of the tops of your square waves at low frequencies. Or induce variations in offset that are waveform dependent. The output impedance of an emitter follower has an inductive component that you have to compensate for. You're probably gonna want some current limit. Overcurrent shutdown is a lot simpler than a smooth transition to current limit in active mode. Carefully consider the load fault current when selecting devices that may have safe-operating-area issues. You can also get blind-sided by SOA issues when driving inductive loads.
Be aware that this isn't a current amplifier. It's a voltage amplifier with a gain less than one and lower output impedance.
If your objective is to supply current, there may be better ways.
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