FEMTO's series DHPVA high frequency amplifiers offer an excellent combination of extraordinary qualities: variable gain, 100 or 200 MHz bandwidth independent of the chosen gain setting, exceptional gain flatness, very low noise and the low offset drift of a precision amplifier. This combination makes the DHPVA amplifiers the perfect choice for all experiments in which top performance is required.
The bandwidth of simple amplifiers usually decreases with increasing gain. Therefore the rise time of pulses and fast signals will vary with the selected gain setting when measured with such amplifiers. This complicates exact and reliable time-resolved measurements.
We addressed this issue with a special design concept. As a result the DHPVA amplifier was born. It shows only limited gain setting dependence and the bandwidth and rise/fall times remain constant with ±10 % maximum deviation across the full gain range.
The multistage design of FEMTO amplifiers avoids the disadvantages of programmable attenuators or multiplying amplifiers where dynamics are limited by the noise and drift performance of the main amplifying stage.
In addition to the excellent dynamics and bandwidth characteristics the DHPVA also shows a superb DC performance. Unlike simpler high frequency amplifiers the DHPVA shows only a minimum DC drift of just 0.6 µV/°C. As a result the baseline stays extremely stable and signals aren't distorted due to varying offsets or temperature drift.
|Lower Cut-Off Frequency||DC/10 Hz||DC/10 Hz|
|Upper Cut-Off Frequency||10/100 MHz, switchable||20/200 MHz, switchable|
|Gain Flatness [dB]||±0.15||±0.15|
|Input Noise Voltage||2.5 nV/√Hz||2.5 nV/√Hz|
|Input Voltage Drift||0.6 µV/°C||0.6 µV/°C|
|Input/Output||50 Ω, BNC||50 Ω, BNC|
|Output Voltage (Power)||±1 V (+10 dBm)||±1 V (+10 dBm)|
|Monitor Output||DC - 100 kHz||DC - 100 kHz|
|Digital Control||TTL, CMOS, opto-isolated||TTL, CMOS, opto-isolated|
|View and Download Datasheet||194 kB||187 kB|
Offset adjustable by trimpot or external control voltage. Indication of selected gain setting by LEDs. 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.
Typical Performance Characteristics
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.
FEMTO® Messtechnik GmbH
Phone: +49-(0)30-280 4711-0
Fax: +49-(0)30-280 4711-11
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