 Options for a fast amplifier array
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rp181
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Wed May 07 2014, 06:37PM
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Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
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I trying to figure out the best way to design an array of amplifiers to drive some small piezoelectric actuators (unsure of capacitance yet).
Running through the numbers:
Max output voltage: 220V
Input voltage: 0-4.096V
Update rate: ~+/-0.5V step at 100khz (optimal)
Rise time target: 1-2us
Bandwidth (0.35/t_rise): 350khz
Max slew rate (2*pi*f*0.5v): ~4-8.17V/us
I was thinking of a two stage amplifier with gain equally split, so I could use a 36V rail for the preamp, yielding a gain of 7.4 for each stage. That means for the HV amplifier portion I'm looking at a GBW of ~1.3Mhz-2.6Mhz.
Now the best option I have right now is the PA84 (
I'd rather not use these due to the cost, as well as the 5.5ma typ quiescent current and size.
The HV256 from supertex is nice- but unfortunately too slow.
Does anyone have any suggestions?
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Dr. Slack
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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
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OK, this doesn't have quite the voltage or speed, so it's a bit OT, but what a package of features , definitely a solution in search of a problem!
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