Piezo Driver / Amplifier And Modulator A-304
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A-304 High Voltage Amplifier/ Piezo Driver and Modulator

The A-304 piezo Driver/Piezo Amplifier is a high Voltage, high speed Piezo Driver / Linear Amplifier combined with a wide band AM/FM modulator.

It was especially designed as a Linear Amplifier / Driver for PIEZO Electric Actuators (also known as "Piezo Amplifier"), stacks,piezo sheets, bimorph elements and other devices. It may be also used as a general purpose High Voltage amplifier for Medical applications (for example, as electode driver for Neurology).

The Piezo Driver / Piezo Amplifier is based on a high voltage, high frequency and high current MOSFET amplifier which is capable of driving up to ±400V (800V ptp) at ±100mA at frequencies from DC to 250 kHz.
By connecting 2 amplifiers in parallel or in series, the output voltage and current may be doubled to 1600Vptp @ 100mA or 800Vptp @ 200mA.

The amplifier section is very stable and has a low noise output and a very low electrical noise - Compare Our Specifications!
The built-in modulator (AM or FM) enables the user to modulate the carrier frequency (adjusted on the front panel) by any input signal at the range of ±10V. This modulator can be bypassed by a switch.

This High Slew Rate Amplifier / Driver can be used for Various applications requesting high Slew Rate, High Voltage and fast response as:
Plasma Driver and Plasma Actuation, driver for piezo manipulator, Optical Switching devices, closed loop feedback systems, vibration control, structural damping analysis, Flow actuation and control etc.

Very Low Electrical Noise.
Low Distortion
No Audible Noise-you may hear your experiment.
High Slew rate-up to 300 Volt/microsecond.
Input protection-High Voltage, On/Off.
Output protection - Short-circuit (for a short time), Power loss,Impedance.

Built in Modulator:
Amplitude(AM) or Frequency(FM) modulation
High Frequency - up to 100 kHz.

Low distortion
Adjustable frequency, Gain, Offset

The modulator may be turned off if not in use
(only amplifier section would work).

Competitive Price!

Block Diagram

Block Diagram



A-304 Piezo Amplifier and Modulator

*Sync output provides a square wave in the same phase and frequency of the modulator output
(for synchronization and frequency measurement).

*The unit is self cooled - no fan or noisy parts.

Amplifier section:
Maximum Input Voltage
± 12 V
Maximum Output Voltage
± 400 V (800V ptp)
Maximum Current
± 100 mA

Into 1 K resistive load
DC to 300 kHz (-3 dB)
Into Capacitive load :
DC to 120 kHz (- 3 dB) (1 nF)
DC to 12 kHz (- 3 dB) (10 nF)
DC to 1 kHz (- 3 dB) (0.1 µF)
DC to 100 Hz (-3 dB) (1 µF)
DC to 10 Hz (-3 dB) (10 µF)
Output Power
40 Watt maximum
DC Gain
40 (up to 100 optional)
Input & Output: Direct DC Coupling
DC Offset
Adjustable to ±320 Volts + DC On/Off
Input Impedance
10 K
Slew Rate
300V/ µSec
Output Impedance
Output Noise (input shorted,
300 KHz. Bandwidth)
10 mV PTP max. (2 mV RMS max.)
Variable Gain Option:
0-40X or 0 - 100X available.
Consult the factory regarding that option.
Modulator Section:
Center Frequency
1 - 100 kHz adjustable
Amplitude (AM) or Frequency (FM)
Sine Wave
0.5 % maximum
Modulation Input F.S.
± 10 V
Modulation Input Impedance
10 K
Sync Output
1 V ptp, AC coupled,1 K Impedance
Amplitude Adjustment
0.5 V ptp to 20 V ptp
Offset Adjustment
± 5 V or 0 V fixed
Modulator output Impedance

The modulator may be turned off
when not in use!

AC Input
Line Input Voltage
110/120 V, 60 Hz or 220/230 V , 50 Hz
Line Input Current
1.3 A peak


2 amplifiers can be connected in series or in parallel in order to double the Output Voltage or Output Current.
Series connection (+/- 800V into a floating load = 1600V ptp).
Series connection
Please note that both amplifiers must be floating (i.e. be careful not to ground them via an oscilloscope etc.)
It is also possible to double or tripple the output voltage by using a special transformer.
Using a transformer is possible only at high frequency (over 10 KHz.) and it requires more components to be added for balancing and proper termination of the load.

Parallel connection is done by adding resistors at the input and at the output.
Please consult the factory for parallel connection.

Download Datasheet Download PDF file

Calulating the estimated current needed to drive your load:

In order to purchase the right amplifier to drive your load, you must calulate the peak current needed.
For Capacitive load:
Click Here
for current

Ipeak(A) = 2 π F C Vpeak (for a Sine Wave)

Ipeak(A) = 4 F C Vpeak (for a triangular wave)

Ipeak(A) = C dV / dt (for a square wave or sharp rise time)

F=Maximum frequency (Hz.)
C=Capacitance in Farads
Vpeak=Maximum Voltage you need to drive your Load.
For Resistive Load:
  I = Vpeak/R
where R is the resistance of your load in Ohms.

The current, Voltage and Frequency must be less or equal to the amplifier's specifications.

This amplifier is NOT SUITABLE for driving pure inductive loads
(i.e. speakers, solenoides, electromagnets etc.)

You must connect your load with thick wires to minimize inductance (like speaker wires). Coaxial cable is not recommended for cables over 2m (6.5 Ft.) because the capacitance of the cable (15-50 pF/Ft) will load your amplifier at high frequencies.

The active impedance of a capacitive load is given by the equation:
Z=1/(2*Pi*F*C) where Pi=3.1415, C in Farads, F in Hz.The user must check that under the peak operation Voltage, at maximum frequency, the current will not exceed 200mA (0.2A).
Operating Voltage is +/-150V, Maximum Frequency=10KHz. Load is 10nF.
Z=1/(2*3.1415*10,000*10EE-9) =1592 Ohms.
150[V]/1592[Ohm] =94[mA] ===>The amplifier will drive that load at an amplitude of 150V (300V ptp).

Frequency Response curve for various loads :

A304 Freq. Response

Fast shipping!!!
All amplifiers are available from stock. We ship within 1 working day after your credit card was approved. Shipping is by UPS. It takes up to 3 working days to ship by UPS to any country.

We accept VISA, MaterCard, American Express. Your credit card is charged only after we ship the order.

For more information about our Amplifiers and Signal Conditioner products , please click here.

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A.A. Lab-Systems
Head Office: 33 Hayetzira St., Ramat-Gan 52521, ISRAEL.Tel: 972-3-5756327, Fax: 972-3-5756326
USA office: 9 Blossom drive, Kennett Square, PA19348.  Tel: (302)478-2881 Fax: (610)444-5544

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