Unlike desktop amplifiers, preamplifier modules provide gain close to the detector before the signal-to-noise ratio significantly decreases due to cable capacitance and noise pickup. Signal processing and measuring after pre-amplifying has no effect on the signal/noise performance.
In order to achieve an extremely low noise performance very high gains were chosen, while nevertheless minimizing the associated bandwidth reduction.
Thus, as a result of our sophisticated development efforts we can offer a professional "High-End" Current Amplifier line. The noise performance of our products surpasses by far that of conventionally designed OpAmp current-to-voltage converters at the corresponding bandwidth.
FEMTO Current Amplifiers show almost ideal behavior without the need for special adaptations or frequency compensations. Bandwidth and frequency response are independent of source capacitance up to 10 nF. No gain peaking will occur.
Lock-In-Amplifiers usually have a special current input. By using instead a low noise preamplifier in noise limited experiments even the sensitivity and speed of a DSP Lock-In is strongly increased. Femtoampere currents can then be measured within a few milliseconds.
|LCA-2-10T||2 Hz||0.18 fA||1012 and 1013 V/A||200 ms||139 kB|
|LCA-30-1T||30 Hz||0.5 fA||1 x 1012 V/A||12 ms||408 kB|
|LCA-30-200G||30 Hz||0.5 fA||2 x 1011 V/A||12 ms||408 kB|
|LCA-200-100G||200 Hz||1.5 fA||1 x 1011 V/A||2 ms||408 kB|
|LCA-200-10G||200 Hz||1.5 fA||1 x 1010 V/A||2 ms||408 kB|
|LCA-1K-5G||1 kHz||3 fA||5 x 109 V/A||400 µs||125 kB|
|LCA-2K-2G||2 kHz||4.5 fA||2 x 109 V/A||200 µs||125 kB|
|LCA-4K-1G||4 kHz||6.5 fA||1 x 109 V/A||100 µs||261 kB|
|LCA-10K-500M||10 kHz||10 fA||5 x 108 V/A||40 µs||261 kB|
|LCA-20K-200M||20 kHz||14 fA||2 x 108 V/A||20 µs||261 kB|
|LCA-40K-100M||40 kHz||19 fA||1 x 108 V/A||10 µs||261 kB|
|LCA-100K-50M||100 kHz||30 fA||5 x 107 V/A||4 µs||261 kB|
|LCA-200K-20M||200 kHz||40 fA||2 x 107 V/A||2 µs||261 kB|
|LCA-400K-10M||400 kHz||65 fA||1 x 107 V/A||1 µs||261 kB|
NOTE: Bandwidth and frequency response are absolutely independent of detector capacitance. Guaranteed and 100 % tested up to 10 nF for each amplifier (up to 1 nF for LCA-400K-10M).
Output voltage ±10 V @ >10 kΩ load. Offset adjustable by trimpot. AC coupling optionally available as customized version. 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.
FEMTO® Messtechnik GmbH
Phone: +49-(0)30-280 4711-0
Fax: +49-(0)30-280 4711-11
© FEMTO 2016