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Voltage Amplifiers: Logarithmic Wideband


  • Wide Dynamic Range up to 80 dB
  • DC coupled input
  • Switchable Input Range
    +20 μV ... +200 mV and +200 μV ... 2V
  • Rise/Fall Time 5 ns
  • Input Noise 2 nV/√Hz
  • Local and Remote Control
  • Integrated Sample & Hold Baseline Correction

Logarithmic Wideband Voltage Amplifier

The FEMTO HLVA-100 Logarithmic Wideband Voltage Amplifier offers a wide dynamic range of up to 80 dB. With a DC coupled input and a rise and fall time of just 5 ns the HLVA-100 is the ideal tool for the measurement of fast and high dynamic pulses. The input voltage noise is extremely low with just 2 nV/√Hz. The logarithmic gain curve offers high gain for small input signals and relatively low gain for high input signals. Therefore the HLVA-100 is the ideal amplifier for signals with high dynamic range and applications in which a signal compression is desired.

Input Offset

The HLVA-100 provides 3 possibilities of an input offset voltage correction (baseline correction). All three methods cancel both temperature drift dependent offset and small source voltage offset:


Low Noise Input/Output Cable: CAB-LN1 Low Noise Cable

Logarithmic Wideband Voltage Amplifiers

  Click Part # to view pdf datasheet
Input Voltage Range Switchable +20 μV ... +200 mV and +200 μV ... +2 V
Dynamic Range Typ. 60 dB (for Accurate Amplitude Measurement)
Max. 80 dB (
for Signal Detection)
Scaling 12.5 mV/dB, 250 mV/Decade @ 50 Ω load
Linearity +1 dB (for pulse of min. 20 ns pulse width)
Signal Path DC Coupled, Rectifying
Input Noise Voltage 2 nV/Hz
Input Voltage Drift 0.6 μV/°C
Input/Output 50 Ω, BNC
Rise/Fall Time 5 ns @ 40 dB step
Output Voltage Range + 50 ... + 1075 mV typ. @ 50 Ω Load
(if Output is adjusted to 1 V at 100 mV Input)
Offset Voltage Range +2.5 mV on input, +500mV on Output
Control Interface TTL/CMOS, opto-isolated
Offset adjustable by trimpot or external control voltage. Power supply + 15 V 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.

Typical Performance Characteristics

FEMTO Product Catalog (pdf)

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