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  • Wideband – Bandwidth up to 500 MHz
  • Switchable Gain up to 60 dB (x 1,000)
  • Noise down to 0.9 nV/√Hz
  • True DC Coupling, Switchable to AC
  • Offset Adjustable to Zero

For optimum signal-to-noise performance choose an amplifier with sufficient bandwidth corresponding to the required signal bandwidth. However, keep in mind that unnecessary high bandwidth introduces more wideband noise. Therefore, FEMTO offers HVA Wideband Voltage Amplifiers with three different upper cut-off frequencies to match individual measurement requirements. And as with all FEMTO Adjustable-Gain Amplifiers the bandwidth remains constant when switching between the different gain settings which is very important for measuring fast signals and pulses.

True DC-Coupling with Zero Output Offset
True DC-Coupling is extremely important for accurate pulse amplification and analysis especially when different pulse lengths occur like in digital codes or transients with micro- to millisecond duration. If the amplifier is AC coupled or has a large output offset to be de-coupled by the AC setting of the oscilloscope there will be significant undershoots and baseline shifts in the measurements. Therefore, all HVA Wideband Amplifiers offer a true DC-coupling and an adjustable output offset control even with the 500 MHz model.

Very Low Input Noise
Low input noise is very important for a good signal-to-noise ratio, especially when amplifying small signals. All HVA Amplifiers are optimized for minimum input noise reaching excellent values as low as 0.9 nV/√Hz.


  • Oscilloscope and Transient-Recorder Preamplifier
  • Photomultiplier and Microchannel-Plate Amplifier
  • Time-Resolved Pulse and Transient Measurements
  • Amplification of Digital Signals (no Baseline Shift at any Digital Code)

Wideband Voltage Amplifiers Selector

Lower Cut-Off FrequencyDC/1 HzDC/1 HzDC/1 HzDC/1 HzDC/1 Hz
Upper Cut-Off Frequency [kHz]10 MHz10 MHz200 MHz200 MHz500 MHz
Input Impedance50 Ohm1 MOhm, BNC50 Ohm, BNC1 MOhm, BNC50 Ohm, BNC
Gain [dB]40/6040/6020/4020/4020
Input Voltage Noise [nV/√Hz]
Input Voltage Drift [μV/°C ]121510
Output Voltage± 3.5 V @ 50 Ω ± 3.5 V @ 50 Ω ± 1 V @ 50 Ω ± 1 V @ 50 Ω ± 1 V @ 50 Ω
Low Noise Input/Output Cable available: CAB-LN1 Low Noise Cable

Output: 50 Ω, BNC. Offset adjustable by trimpot. Output short-circuit protected. Power supply ± 15 V via 3-pin LEMO socket. A mating connector is provided with the device. Optional power supply PS-15 available. For further information please view the datasheet.

FEMTO Product Catalog (pdf)

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