What kind of current are you talking?
There are lots of power opamps and H-bridges around\.  Try www.allegromicro.com
David

Donovan Parks wrote:

> Hello,
>
> I am in need of a dual railing H-Bridge IC.  By this, I mean an H-bridge IC that allows me to set a high railing at 10V, a low railing at -10V, and then use two CMOS signal to control the polarity across my sensor (a cermain ultrasonic transducer).  The idea being I can then switch the CMOS signal at each side of the H-bridge to create a 40kHz 20Vp-p square wave.  Does such an IC exist?  I have not heard of one and my search turned up nothing.
>
> If I am going to build this circuit with transistors can someone suggest a transistor that can handle these railings, has a low Vce(sat) rating, and can switch quickly (I want to be as close as possible to a 20Vp-p square wave).
>
> An alternative to transistors would be to use two op-amps set as comparators with a reference voltage of 2.5V.   Then, two CMOS signal could saturate the op. amps to +10V or -10V as desired.  Hence, can anyone suggest a dual comparator IC that can come close to the railings (I think this is refered to as a railing-to-railing op. amp.) and has a fast switching rate (again, to come as close as possible to a square wave).
>
> Does anyone have an alternative suggestion?  Note, that I need to be able to 'turn off' the circuit so there is zero volts across the transducer (apparently, a DC voltage across it causes 'wear and tear').  Both the transistor H-bridge and comparator circuits allow this by setting the CMOS signals to the same state.
>
> Regards,
> Donovan Parks
>
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