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 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 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 Amplifiers offer a true DC coupling and an adjustable output offset control even with the 500 MHz model.
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.
|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 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|
|Input Impedance||50 Ω||1 MΩ||50 Ω||1 MΩ||50 Ω|
|View and Download Datasheet||142 kB||551 kB||76 kB||140 kB||133 kB|
Output impedance 50 Ω. Offset adjustable by trimpot. Output short-circuit protected. 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 or contact FEMTO.
The DHPVA voltage amplifier series has been revised, resulting in the new models DHPVA-101 (DC - 100 MHz) and DHPVA-201 (DC - 200 MHz). Input voltage drift and noise are improved to an extraordinary low level while still convincing with a constant bandwidth at any gain setting.
The photoreceiver series HSA-X-S was broadened by two models featuring an improvement in noise performance of up to 40%. The output reflection coefficient was reduced by 8 dB at the same time.
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