High Voltage / Piezo Amplifier

A-310 High Voltage, High Power Amplifier/ Piezo Driver:

The A-310 Piezo Driver/Piezo Amplifier is a high Voltage, fast Piezo Driver / Linear Amplifier for high power applications.

It was especially designed as a Linear Amplifier / Driver for high capacitance PIEZO Electric Actuators (also known as "Piezo Amplifier"), stacks, piezo sheets, bimorph elements and other devices.

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 ±100V (200V ptp) at ±2.5A at frequencies from DC to 250 kHz.

  1. The A-310 amplifier is available in 2 configurations:
  2. Single Amplifier ±100V output, ±2.5A output current, DC 250KHz. Frequency Bandwidth
  3. Dual Amplifier: 2 Independent Amplifiers with independent inputs and outputs, ±100V outputs, ±1.2A output current capability, DC 250 KHz. Frequency bandwidth.

By connecting 2 amplifiers in inverting, differential connection to a floating load, up to ±200V @ ±1.2A can be delivered to the load (240W peak or 120W RMS).

The amplifier section is very stable and has a very low electrical noise - Compare Our Specifications!

This High speed Amplifier / Driver can be used for Various applications requesting high frequency, 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.

  1. Features:
  2. High Frequency Amplifier: DC 250KHz
  3. Very Low Electrical Noise: <5mVptp
  4. Low Distortion: <0.01% @ (DC-1KHz)
  5. High Slew Rate: 150 Volts/microsecond

Output Vs. Input @ 1KHz Sine Wave

Output Vs. Input @ 250KHz Sine Wave

  1. Specifications:

Amplifier Section:

Maximum Input Voltage


Maximum Output Voltage

±100V (200Vptp)

Maximum Current

±2.5A (±1.2A in dual amp configuration)


Into 1 K Resistive Load
DC to 250kHz (-3dB)
Into Capacitive load (single amp):
DC to 250kHz (-3dB) (0 to 20nF)
DC to 75kHz   (-3dB) (50nF)
DC to 38kHz   (-3dB) (0.1µF)
DC to 3500Hz (-3dB) (1µF)
DC to 350Hz   (-3dB) (10µF)

Output Power

250 Watt Peak

DC Gain

10 (upto 50 optional)


Input & Output: Direct DC Coupling

DC Offset

Adjustable to ±10 Volts + On/Off Switch

Input Impedance

10 K

Slew Rate


Output Impedance


Output Noise (Input shorted, 250KHz. Bandwidth)

6mV PTP max. (1.3mV RMS max.)

Variable Gain Option

0-10X or 0-20X or 0-40X available
Please consult the factory regarding that option

AC Input:

Line Input Voltage

110/120V, 60Hz or 220/230V, 50/60Hz.
Preset on factory

Line Input Current

6A peak (@220VAC)


01 - One channel, ±100V @ ±2.5A

1 input, 1 output

02 - Dual Channel, ±100V @ ±1.2A X2

2 inputs, 2 outputs

02 - Higher Gain

Upto 50

04 - Variable Gain

0-10X or 0-20X - No Charge.

The Standard amplifier has very low noise.

Noise level @ 250 KHz. BW, input shorted

Display set @ 5mV/div. 100nS/div.

Total noise is less than 1mV RMS!

Output Noise - 250 KHz. Bandwidth 5MHz B.W. Limit

The Amplifier's are housed in a standard 19" rack enclosure, 4U height. Weight: 24 Kg.

  1. Applications:
  2. 2 amplifiers can be connected in series or in parallel in order to double the Output Voltage or Output Current. Series connection (±400V into a floating load = 800V ptp).

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:
          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.
          Π = 3.1415927

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

  1. Frequency Response Curve for Various Output Configurations and Loads:
    1. 2 Bi-Polar Amplifiers, ±95V @ 1.25A:
    2. 1 Bi-Polar Amplifiers, ±95V @ 2.5A:
    3. 1 Uni-Polar Amplifier, 0-190V @ 2.5A:
    4. 2 Uni-Polar Amplifiers, 0-190V @ 1.25A:

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*π*F*C) where π=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 2500mA (2.5A)


Output Voltage is ±100V, Maximum Frequency = 20kHz, Load is 100nF
Z=1/(2*3.1415*20,000*10*10-9)=79.6 Ohms
100[V]/80[Ohm]=1250[mA] ===> The single channel amplifier will drive that load at an amplitude of 100V (200V ptp). For the dual channel amplifier, this load is marginal because the current capacity is only 1200mA

For any sort of clarifications kindly contact: