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.
FEATURES
- Input noise down to 180 aA/√Hz
- Bandwidth up to 400 kHz
- Gain up to 10^13 V/A
- Flat frequency response
- EMI-shielded case
GAIN AND NOISE
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.
BANDWIDTH AND FREQUENCY RESPONSE
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.
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
- Photodetector amplifier
- Spectroscopy
- Scanning tunneling microscopy
- Ionization detectors
- Pyro- and piezoelectric detectors
| Model | 3-dB Bandwidth (DC ...) |
Noise Current [/√Hz] |
Transimpedance (Gain) |
Rise/Fall Time |
Datasheet |
| LCA-2-10T | 2 Hz | 0.18 fA | 1012 and 1013 V/A | 200 ms | 212 kB |
| LCA-30-1T | 30 Hz | 0.5 fA | 1 x 1012 V/A | 12 ms | 259 kB |
| LCA-30-200G | 30 Hz | 0.5 fA | 2 x 1011 V/A | 12 ms | 259 kB |
| LCA-200-100G | 200 Hz | 1.5 fA | 1 x 1011 V/A | 2 ms | 258 kB |
| LCA-200-10G | 200 Hz | 1.5 fA | 1 x 1010 V/A | 2 ms | 258 kB |
| LCA-1K-5G | 1 kHz | 3 fA | 5 x 109 V/A | 400 µs | 257 kB |
| LCA-2K-2G | 2 kHz | 4.5 fA | 2 x 109 V/A | 200 µs | 259 kB |
| LCA-4K-1G | 4 kHz | 6.5 fA | 1 x 109 V/A | 100 µs | 259 kB |
| LCA-10K-500M | 10 kHz | 10 fA | 5 x 108 V/A | 40 µs | 260 kB |
| LCA-20K-200M | 20 kHz | 14 fA | 2 x 108 V/A | 20 µs | 260 kB |
| LCA-40K-100M | 40 kHz | 19 fA | 1 x 108 V/A | 10 µs | 259 kB |
| LCA-100K-50M | 100 kHz | 30 fA | 5 x 107 V/A | 4 µs | 260 kB |
| LCA-200K-20M | 200 kHz | 40 fA | 2 x 107 V/A | 2 µs | 260 kB |
| LCA-400K-10M | 400 kHz | 65 fA | 1 x 107 V/A | 1 µs | 258 kB |
NOTE: Bandwidth and frequency response are 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. 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.