Logarithmic Voltage Amplifier HLVA-100


  • Wide dynamic range up to 80 dB
  • DC coupled input
  • Switchable input range from ±20 µV to ±200 mV and from ±200 µV to ±2V
  • Rise/fall time 5 ns
  • Input noise 2 nV/√Hz
  • Local and remote control
  • Integrated sample and hold baseline correction

Input Voltage Rangefrom ±20 µV to ±200 mV and from ±200 µV to ±2 V
Dynamic Range Typ. 60 dB (for accurate amplitude measurement) Max. 80 dB (for signal detection)
Scaling12.5 mV/dB, 250 mV/decade (@ 50 Ω load)
Linearity±1 dB (for pulse of min. 20 ns pulse width)
Input Noise Voltage2 nV/√Hz
Input Voltage Drift 0.6 µV/°C
Input/Output50 Ω, BNC
Rise/Fall Time 5 ns @ 40 dB
Output Voltage Rangefrom +50 to +1075 mV typ. @ 50 Ω load (if output is adjusted to 1 V at 100 mV input)
Output Offset Voltage Range±500 mV, adjustable by offset-trimpot
Baseline CorrectionAcquisition time30 µs (min. sample pulse width)
Baseline Hold Droop Rate1 µV/s (typ. @ 25 °C)
Loop Cut-Off Frequenz1,5 kHz
Power Requirements±15 V, +100 mA/−150 mA
Control Interface 3 opto-isolated digital inputs, TTL/CMOS compatible

Offset adjustable by trimpot or external control voltage. Power supply 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.

General Description

The FEMTO HLVA-100 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:

  • Manual null adjust by trimpot
  • Remote null adjust by ±10 V control voltage
  • Baseline correction loop to perform remote auto-null


  • LIDAR systems
  • Signal compression
  • Time-resolved pulse and transient measurements
  • Mass spectroscopy
  • Particle detection

Typical performance characteristics

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Power Supply