A real Power Op Amp: 900V at 1,700 V/us

APEX Microtechnology in Tucson, AZ does it again. This talented design team has just introduced the PA194 Power Op Amp.

High voltage, high speed with high slew rate with low noise are not all easy parameters to achieve in a single amplifier.

The amplifier is capable of supplying 100 mA with only 4 mA quiescent current (In standby mode) at a low noise density of 5 nV/√Hz @ 1 kHz (typical)

The amplifier can handle up to 30W continuous power dissipation.


ATE, SONAR, and Industrial Instrumentation are only a few of the possible applications for this kind of amplifier. Piezoelectric positioning and particle deflection are other kinds of possible applications.

One unique application is a Focused Ion Beam (FIB) system. This design uses a finely focused beam of liquid metal ion sources such as Gallium ions, operated at high voltage with low-beam currents for imaging and at high-beam currents for site-specific milling. This kind of system is versatile and useful for a wide variety of applications including advanced circuit edit, and revealing below-the-surface defects in advanced materials and devices. Uses are in the semiconductor industry, materials science, and the biological field just to name a few.

A charged particle beam deflection circuit (Image courtesy of APEX Microtechnology)

A charged particle beam deflection circuit (Image courtesy of APEX Microtechnology)


Apex has samples now, but production will be in Q418. There will be an EK66 evaluation kit in early Q318.

This amplifier will open up some new design possibilities for circuit and system designers in the industry. This single package design enables easy implementation of the device in systems which needed much more of a board footprint in the past.

Please share your thoughts and let our readers know if you can think of other possible design areas in which this kind of device might be used.

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