FEMTO's series of DHPVA wideband amplifiers offers an outstanding combination of extraordinary qualities: variable gain up to x1,000, 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 applications where amplifiers with almost ideal characteristics are needed. The sensitivity of oscilloscopes and AD converters is increased many times without affecting the shape of the signals to be measured.
The bandwidth of common variable gain amplifiers usually decreases with increasing gain. Therefore the rise and fall time of pulses and fast signals will vary with the selected gain setting, making exact and reliable time-resolved measurements difficult or even impossible.
We addressed this issue by developing a sophisticated wideband design concept for our innovative wideband amplifiers. Bandwidth and rise/fall times remain constant within ±10 % maximum deviation across the full gain range for all gain settings.
The multistage amplifier design chosen by FEMTO avoids the disadvantages of programmable attenuators or multiplying amplifiers where dynamics are limited by the noise and drift performance of the main amplifying stage. As a result of the sophisticated multistage design the DHPVA-Series is equally suitable for input signals amplitudes from about 100 µV up to 300 mV (dynamic range 70 dB). Thanks to its superb DC stability the dynamic range can be increased further when signal averaging is applied, providing an effectively usable signal range from 10 µV to 300 mV (90 dB).
|Lower Cut-Off Frequency||DC/10 Hz, switchable||DC/10 Hz, switchable|
|Upper Cut-Off Frequency||10/100 MHz, switchable||20/200 MHz, switchable|
|Gain Flatness [dB]||±0.15||±0.15|
|Gain [dB]||10/20/30/40/50/60, switchable||10/20/30/40/50/60, switchable|
|Input Noise Voltage||2.3 nV/√Hz||2.3 nV/√Hz|
|Input Voltage Drift||0.3 µV/°C||0.3 µV/°C|
|Input/Output||50 Ω, BNC||50 Ω, BNC|
|Input Return Loss S11||−31 dB @ 100 MHz||−22 dB @ 200 MHz|
|Output Return Loss S22||−35 dB @ 100 MHz||−30 dB @ 200 MHz|
|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|
|Datasheet||375 kB||361 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 series PS-15 available. For further information please see the datasheet or contact FEMTO.
The new improved models DHPVA-101 and DHPVA-201 replace the previous models DHPVA-100 and DHPVA-200. They are fully compatible delivering at least the same or better electrical performance. The heatsinks may be removed if adequate alternative cooling is provided like mounting the amplifier to a sufficiently large case/rack system.
Typical Performance Characteristics for selected gain settings [dB] of DHPVA-201
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.
FEMTO® Messtechnik GmbH
Phone: +49-(0)30-280 4711-0
Fax: +49-(0)30-280 4711-11
© FEMTO 2016