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AC+DC adder to drive Piezo

Hi,
I bought an AC piezo driver (0-20V, bandwidth>100kHz).
I also have a DC piezo driver (0-150V).
I want to build something that can add those two signals.

I tried to use a high-power, ultra-fast OpAmp to make a simple adder.
The problem I got so far is that the rising time is killed when I
connect the piezo (C=600nF). I need a rising time of less than 10us for
Vpp=20V.
The other problem with this design is that the 2 drivers output are not
isolated from each other.

Does anyone has an idea on how I can solve my problem.
Does anyone know good reference (book, web site...) to build piezo
drivers.

Thank you very much for your help.
 
I need a DC piezo driver because I use the piezo as a linear motor in
the nano-micrometer range.
So by changing the DC voltage I change the piezo length.
This is very common in (nano) physics research lab.
 
Yes, correct.


John said:
---
Please bottom post.

you say you bought an AC piezo driver, but you claim that it goes
from zero to 20 volts, which makes it a DC piezo driver which can
swing between zero and 20 volts.

Then you say that you have a DC piezo driver which can swing from
zero to 150 volts, and that you want to add the outputs of both
drivers.

From that I gather that you'd like to be able to, say, crank the
150V driver up to 150V and let the 20V driver ride on that, so the
piezo would be seeing a signal varying from 150V to 170V at a 100kHz
rate.

Is that what you want?
 
M

Mike_in_SD

Jan 1, 1970
0
So whats up with the request to bottom post ..

what is convenient for some is a pain for others

when you have people that insist on posting the whole
post of the previous poster, its a pain to have to
scroll thru the history to get to a one line answer.

bottom posting never did make sense







[email protected] wrote in <1151549381.945040.139300
@i40g2000cwc.googlegroups.com>:
 
J

JeffM

Jan 1, 1970
0
So whats up with the request to bottom post ..
Mike_in_SD
It called "When in Rome...".
what is convenient for some is a pain for others
Stop being selfish--or find a Web-based forum.
when you have people that insist on
posting the whole post of the previous poster,
They are (generally speaking) totally wrong and stupid.
its a pain to have to scroll thru the history
to get to a one line answer.
That would be DIRECT evidence that the idiot who posted that
doesn't know what he is doing.
If someone does in fact need that much context (see below),
he should probably be middle-posting (as I have done here).
bottom posting never did make sense
When you see it done wrong, it's easy to ASSuME that.
Do you constantly use
the WORST examples you come across in your daily life as templates
or consider them to be excuses for making up your own rules.

Here's the proper technique on Usenet:
1) TRIM OUT anything that does not
DIRECTLY correspond to your response.
2) Make your addition BELOW that
so that what results will read like a *dialog*
--not an event and a flashback.
 
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