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Falco Systems WMA-100 User Manual

High voltage amplifier dc – 500khz
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Falco Systems WMA-100
● High voltage: 20x amplification up to +175V and -175V output voltage
● DC to 500kHz at (-3dB) large signal bandwidth and 100mA output current
● Very low noise: ~560µV
● No overshoot with capacitive loads: bandwidth changes automatically to
ensure stability
● Short-circuit protected output
● Adjustable DC offset
About this manual
This user manual is an integral part of the
Falco Systems WMA-100 high voltage
amplifier product. Please read it carefully
and pay attention to the recommendations
and instructions for safe use.
The WMA-100 amplifier:
getting started
The Falco Systems WMA-100 model is a
high quality, cost-effective, high voltage,
linear
laboratory
amplifier.
bandwidth and large voltage range make it
an excellent choice for use with MEMS
High Voltage Amplifier DC – 500kHz
USER MANUAL
, and even lower with capacitive loads
rms
devices, EO-modulators, piezo positioning
systems,
dielectric
applications. It is designed to be fully
stable and free of spurious signals with
any capacitive load.
The amplification is 20x (fixed). The
amplifier has a range of -175V to +175V, a
large 500kHz @ -3dB signal bandwidth, a
typical slew rate of 350V/µs, and a noise
level
protection with a fast current limit of
Its
wide
±100mA makes this amplifier suitable for
both normal daily laboratory use and
automated measurement systems.
beam
steering,
ultrasonics,
studies,
and
many
of
~560µV
.
The
short-circuit
rms
other

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Summary of Contents for Falco Systems WMA-100

  • Page 1 -175V to +175V, a getting started large 500kHz @ -3dB signal bandwidth, a typical slew rate of 350V/µs, and a noise The Falco Systems WMA-100 model is a level ~560µV short-circuit high quality, cost-effective, high voltage,...
  • Page 2 The WMA-100 model has been designed accessible. to be fully stable with all capacitive loads. - The airflow to and from the WMA-100 It has been optimized for a perfect step- amplifier should...
  • Page 3 The noise of the amplifier (~560µV ) is lowest when a low-impedance source is The WMA-100 model provides an offset used, such as a pre-amplifier output or a control knob to enable the amplifier to 50Ω function generator output. An easy...
  • Page 4 Figure 3. Offset circuitry ‘On-Off’ switch and offset control knob The load Transmitter mode The output impedance of the WMA-100 This amplifier can generate a significant model is 50Ω, to ensure stability with all amount of power at frequencies used for capacitive loads.
  • Page 5 100pF 10nF 100nF 10uF Frequency (Hz) Figure 4. Frequency response at 300V output voltage with different capacitive loads 100pF 10nF 100nF 10uF Frequency (Hz) Figure 5. Frequency response at 1V output voltage with different capacitive loads -100 -150 Time (ms) Figure 6.
  • Page 6 -100 -150 Time (ms) Figure 7. Triangle wave 300V 1kHz -100 -150 Time (ms) Figure 8. Square wave 300V 1kHz -100 -150 Time (µs) Figure 9. Square wave 300V 100kHz...
  • Page 7 -0.2 -0.4 Time (µs) Figure 10. Square wave 1Vpp 100kHz (small signal response) In Figure 11 the unipolar and bipolar step response are shown -100 -150 Time (µs) Figure 11a. 300Vpp step response 10-90%: up in 1.0µs -100 -150 Time (µs) Figure 11b.
  • Page 8 Time (µs) Figure 11c. 0 to 150V step response 10-90%: up in 0.8µs Time (µs) Figure 11d. 150 - 0V step response 10-90%: down in 0.8µs In Figure 12 the 300Vpp square wave response under different capacitive loading conditions is shown. The 100mA current limit limits the speed at which the capacitor can be charged. The bandwidth adjustments of the amplifier with different capacitive loads preventing overshoot are clearly visible.
  • Page 9 -100 -150 Time (µs) Figure 12b. 100pF load -100 -150 Time (µs) Figure 12c. 1nF load -100 -150 Time (µs) Figure 12d. 10nF load...
  • Page 10 -100 -150 Time (ms) Figure 12e. 100nF load -100 -150 Time (ms) Figure 12f. 1µF load -100 -150 Time (ms) Figure 12g. 10µF load...
  • Page 11 Time (ms) Figure 13. Noise (~560µV measured with a true rms voltmeter) with the offset control switched to ‘Off’. The noise may appear to be higher than shown here if the amplifier input is not connected to a low-impedance source. Time (ms) Figure 14.
  • Page 12 Capacitance (pF) Figure 16. Rms output noise voltage versus capacitive load with offset control switched ‘Off’ Technical specifications Amplification: 20x, fixed Bandwidth: DC – 500kHz @ -3dB large signal bandwidth Slew rate: 350V/µs typical Output voltage: -175V to +175V Current: 100mA typical with limiter Noise and offset: 560µV output noise typical, 40mV offset typical Input impedance: 100kΩ...
  • Page 13: Weee And Rohs

    Phone +31 (0)6 21840996 Email info@falco-systems.com Website www.falco-systems.com WEEE and RoHS Do not dispose of the WMA-100 amplifier as standard waste, but bring it to a WEEE electronic waste collection point. The amplifier has been built in compliance with the RoHS directive.