Ultra Low Noise Current Amplifiers, Preamplifiers
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Series LCA
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HzWhy
use a Preamplifier Module?
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 preamplifying has no
effect on the signal/noise performance.
Gain
and Noise
In order to achieve an extremely
low noise performance in the LCA current amplifier 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.
Bandwidth and
Frequency Response
FEMTO ultra low-noise 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 10nF. No gain peaking will occur.
Preamplifier for Lock-Ins
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.
Applications
Photodetection with PMTs
and Photodiodes
Spectroscopy
Scanning Tunneling
Electron Microscope
Ionization
Detectors
Pyro and Pyroelectric Detectors
Ultra low noise current amplifiers selector:
Click Part # to view pdf datasheet
| Model | (DC ...) |
Noise Current {/√Hz] |
Transimpedance (Gain) [V/A] | Rise/Fall Time |
| DDPCA-300 |
Variable - see DDPCA product page |
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| DLPCA-200 |
Variable - see DLPCA product page |
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| LCA-1-10T | 1 Hz | 0.18 fA | 1 x 1013 | 360 ms |
| LCA-30-1T | 30 Hz | 0.5 fA | 1 x 1012 | 12 ms |
| LCA-30-200G | 30 Hz | 0.5 fA | 2 x 1011 | 12 ms |
| LCA-200-100G | 200 Hz | 1.5 fA | 1 x 1011 | 2 ms |
| LCA-200-10G | 200 Hz | 1.5 fA | 1 x 1010 | 2 ms |
| LCA-1K-5G | 1 kHz | 3 fA | 5 x 109 | 400 µs |
| LCA-2K-2G | 2 kHz | 4.5 fA | 2 x 109 | 200 µs |
| LCA-4K-1G | 4 kHz | 6.5 fA | 1 x 109 | 100 µs |
| LCA-10K-500M | 10 kHz | 10 fA | 5 x 108 | 40 µs |
| LCA-20K-200M | 20 kHz | 14 fA | 2 x 108 | 20 µs |
| LCA-40K-100M | 40 kHz | 19 fA | 1 x 108 | 10 µs |
| LCA-100K-50M | 100 kHz | 30 fA | 5 x 107 | 4 µs |
| LCA-200K-20M | 200 kHz | 40 fA | 2 x 107 | 2 µs |
| LCA-400K-10M | 400 kHz | 65 fA | 1 x 107 | 1 µs |
| NOTE: Bandwidth and frequency response are absolutely independent of Detector Capacitance. Guaranteed and 100 % tested up to 10 nF for each amplifier. | ||||
| Output voltage ± 10 V @ 10 kOhm load. Offset adjustable by trimpot or external control voltage. AC-Coupling optional. Output short-circuit protected. Power supply via 3-pin LEMO socket. A mating connector is provided with the device. Optional power supply PS-15 is available. For further information, please view datasheets. | ||||
