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Voltage Amplifiers: Wideband

HVA Series

  • 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.



Wideband Voltage Amplifiers Selector

  Click Part # to view pdf datasheet
Model HVA-
Lower Cut-Off Frequency DC/1 kHz DC/1 Hz DC/1 kHz DC/1 Hz DC
Upper Cut-Off Frequency 10 MHz 10 MHz 200 MHz 200 MHz 500 MHz
Input Impedance 50 Ω 1 MΩ, BNC 50 Ω, BNC 1 MΩ, BNC 50 Ω, BNC
Gain [dB] 40/60 40/60 20/40 20/40 20
Input Voltage Noise [/Hz] 0.9 nV 4.7 nV 1.2 nV 4.5 nV 3.0 nV
Input Voltage Drift 1 μV/°C 2 μV/°C 1 μV/°C 5 μV/°C 10 μV/°C
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 +15V via 3-pin LEMO socket. A mating connector is provided with the device. Optional power supply PS-15 is available. For further information please view the datasheet.

FEMTO Product Catalog (pdf)

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