Power Stage Piezo Driver

Well, it is a little difficult to make out what you have on the schematic. It looks a little bit like short-hand for standard symbols. Perhaps you could take a little more time and draw it more clearly.

From a practical point of view, however, the problem becomes one of what will happen if both transistors are on at the same time. Unfortunately, transistors take a finite amount of time to turn on and off. So, if you pick carefully and the turn off time is always faster than the turn on time then you will be off to a good start.

I don't see a way for the base current of the PNP transistor to be limited for the signal input. It could prove to be unhealthy for that transistor. Since I don't know what your input signal looks like, it appears to be risky.

O.K.The input pulse is rectangular type,lets say two volts,when lower transistor is on,through the 100uf same volts are transmited to upper pnp transistor cutting it off..(my theory) but don't know what happens when you plug the circuit at the beginning.Believe or not, the drawing was hard and was edited (contrast for example) tried with "pcb artist" and couldn't put it here because its .type, pasted in a word doc and fail again so scan and gimp...

I do not know, what is the purpose of this exercise, as piezo driver IC, like the LT3572, and higher power ones and boards are freely available for various frequency ranges. Fully engineered, with all the damping, contol and protection built-in. There even is an ic incorporating all the transmit and receive function for a hospital ultrasound machine. Reinventing the wheel is a waste of time.

I don't even know why you think this is an "exercise" professor but clearly whatever your IC does, don't apply here. Did you even read the question?.-

"the irs21094 version adds an adjustable delay time"

Sorry, I meant to say, deadtime, not delay time.

Hi, i kept studing your circuit several hours.I tell you my doubts: 1)i think a resistor serie with load should be necesary or Cpiezo becomes a shortcircuit,same than using bjts;2) i can't follow details, (not an expert in this huge variety of these fet components):Don't bridge keeps confuse when asimetrical power supply -30v-0v-+150v is provided?;3) i got the circuit data, your squematics just adds a very low current to vcc=-18v by a reference diode,think those are 5-10ma (i'll chek),is it enough?.Your circuit looks so simple and beautiful is a temptation quit my own and make yours think will work? i wasn't sure about my own..

Thanks my friend,this is the kind of answer you expect but normally you don't get.I quit my electronics studies at the beggining of digital, flip-flops an pulse forming circuits so i was trying to use coupple transistors , i forgot everything about thiristors or fets but anyway, i'll stop my components purchases until study your 10a 600v component what you are a fan, perhaps i could avoid try the TTL and linear ampop (me transistors fan).Of course i'll study carefully the whole chekout of your circuit.Obviously you are a very capable man who dont get happy showing feathers...You don't have any problem to calculate or so neither.I share with you your passion for work and help others.Thanks again.I think i'll tell you my next steps on if you like.-