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Electronics Forum / Electronics / June 2006AC+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. Why would you or anyone need a d.c. piezo driver? I'm obviously missing something here. Harry C. > Hi, > I bought an AC piezo driver (0-20V, bandwidth>100kHz). [quoted text clipped - 13 lines] > > 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. > Why would you or anyone need a d.c. piezo driver? I'm obviously > missing something here. > > Harry C. Thanks, that makes sense. I've seen similar things done in Mossbauer effect type work. Harry C. > I need a DC piezo driver because I use the piezo as a linear motor in > the nano-micrometer range. [quoted text clipped - 5 lines] > > > > Harry C. > 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. if both sources are ground referenced hook the DC source to one terminal and the AC source to the other end Bye. Jasen > Hi, > I bought an AC piezo driver (0-20V, bandwidth>100kHz). > I also have a DC piezo driver (0-150V). these figures represent what? > I want to build something that can add those two signals. connect the devices in series? use a resistor network? > 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. tell us what else you need first. > Does anyone has an idea on how I can solve my problem. no idea what your problem is. > Does anyone know good reference (book, web site...) to build piezo > drivers. seems like a push-pull outyput stage is all that's needed... Bye. Jasen >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. --- 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?  SignatureJohn Fields Professional Circuit Designer Yes, correct. > >Hi, > >I bought an AC piezo driver (0-20V, bandwidth>100kHz). [quoted text clipped - 18 lines] > > Is that what you want? >Yes, correct. --- Then why, after I politely asked you to bottom post, as is the custom in these groups, did you so rudely top post? You want free help but you want it on your own terms? Maybe someone else will help you, but I won't. SignatureJohn Fields Professional Circuit Designer >> >Hi, >> >I bought an AC piezo driver (0-20V, bandwidth>100kHz). [quoted text clipped - 18 lines] >> >> Is that what you want? > Yes, correct. > [quoted text clipped - 24 lines] > > John Fields > > Professional Circuit Designer A simple capacitor/diode clamp circuit would seem to do 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 cbarn24050@aol.com wrote in <1151549381.945040.139300 @i40g2000cwc.googlegroups.com>: >> Yes, correct. >> [quoted text clipped - 26 lines] > >A simple capacitor/diode clamp circuit would seem to do >So whats up with the request to bottom post .. > [quoted text clipped - 5 lines] > >bottom posting never did make sense --- When you're inconsiderate of others who may come to the thread some time after it started, then it may not seem to make much sense, even though it does. You don't read a book backwards, and it's inconsiderate to force others to read a series of articles chronologically backwards. Even Google thinks so. From: http://groups.google.com/support/bin/answer.py?answer=12348&topic=250 "Summarize what you're following up. When you click "Reply" under "show options" to follow up an existing article, Google Groups includes the full article in quotes, with the cursor at the top of the article. Tempting though it is to just start typing your message, please STOP and do two things first. Look at the quoted text and remove parts that are irrelevant. Then, go to the BOTTOM of the article and start typing there. Doing this makes it much easier for your readers to get through your post. They'll have a reminder of the relevant text before your comment, but won't have to re-read the entire article. And if your reply appears on a site before the original article does, they'll get the gist of what you're talking about." --- BTW, speaking of being considerate, you need to clean up your punctuation as well as learn to top-post as the Romans do. SignatureJohn Fields Professional Circuit Designer >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. ["Followup-To:" header set to sci.electronics.misc.] > So whats up with the request to bottom post .. it puts stuff in chronological (or conversation) order. > 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. That's what the page-down key is for. having to scroll to the bottom of the post to see what your talikng about and then back up to the message is worse. Bye. Jasen |
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