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Variable Gain Ultra-Low-Noise Current Amplifier
Variable Gain Low-Noise Current Amplifier
Sub-Femto Ampere Sensitivity
Broad Application Range
MHz Speed
Ultra Low-Noise Current Amplifier
High-Speed Current Amplifier
»Variable Gain Ultra-Low-Noise Current Amplifier
- 0.4 fA peak-to-peak noise
- Variable transimpedance gain from 104 to 1013 V/A
- 240 dB dynamic range for sub-fA to mA measurements
- Adjustable bias voltage
- Compact and highly EMI-shielded case for use close to the signal source
- Manual and remote control
APPLICATIONS
-
- Photo and ionization detector amplifier
- I/V characterization of MOS and JFET structures
- Measurement of ultra-low currents
- Quantum and biotech experiments
- Spectroscopy
- High resistance measurements
- Easy-to-use FEMTO® amplifier add-on to existing digital voltmeter or A/D converter
»Variable Gain Low-Noise Current Amplifier
- Variable transimpedance gain from 103 to 1011 V/A
- Input noise down to 4.3 fA/√Hz
- Bandwidth up to 500 kHz
- Rise time down to 700 ns
- Adjustable bias voltage
- Manual and remote control
APPLICATIONS
- Photodetector amplifier
- Scanning tunneling microscopy (STM)
- Spectroscopy
- Beam monitoring for particle accelerators /synchrotrons
- Ionization detectors
- Preamplifier for lock-ins, A/D converters, etc.
»Sub-Femto Ampere Sensitivity
The values for bandwidth, rise time and integrated input noise stated in the table above are achieved with the low pass filter set to full bandwidth. Lower noise values can be achieved by setting the low pass filter to 0.7 Hz or 0.1 Hz. The minimum of 0.4 fA peak-to-peak noise is achieved in the gain settings 1012 and 1013 V/A with the low pass filter set to 0.1 Hz.
Offset adjustable by potentiometer. Overload indication by LED and digital control output. Input protected against ±2 kV transients. 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®.
| Model | DDPCA-300 |
|---|---|
| Transimpedance [V/A] | 104 105 106 107 108 109 1010 1011 1012 1013 |
| Bandwidth* (–3 dB) [Hz] | 400 400 400 400 150 150 20 20 1 1 |
| Rise Time* (10 % – 90 %) [ms] | 0.8 0.8 0.8 0.8 2.3 2.3 17 17 350 350 |
| Equ. Input Noise [/√Hz] | 45 pA 45 pA 0.45 pA 0.45 pA 15 fA 15 fA 1.3 fA 1.3 fA 0.2 fA 0.2 fA |
| Accuracy | Transimpedance (Gain) ±1 % |
| Low Pass Filter | 3 settings: full bandwidth, 0.7 Hz and 0.1 Hz |
| Output Range | ±10 V, ±30 mA |
| Power Supply | ±15 V, +70 mA / −15 mA typ. |
| Control Interface | 4 opto-isolated digital inputs, TTL/CMOS compatible, analog voltage input for bias control |
| Case | 170 x 60 x 45 mm (L x W x H), weight 320 g (0.74 lbs) |
»Broad Application Range
Offset adjustable by potentiometer or external control voltage. LED overload indication. Input protected against ±3 kV transients. 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®.
| Model | LPCA-200 |
|---|---|
| Performance Range | Low Noise High Speed |
| Transimpedance [V/A] | 103, 104, 105, 106, 107, 108, 109, 105, 106, 107, 108, 109, 1010, 1011, |
| Bandwidth (−3 dB) [kHz] | 500, 500, 400, 200, 50, 7, 1.1, 500, 500, 400, 200, 50, 7, 1.1, |
| Rise Time (10 % – 90 %) | 700 ns, 700 ns, 900 ns, 1.8 μs, 7 μs, 50 μs , 300 μs, 700 ns, 700 ns, 900 ns, 1.8 μs, 7 μs, 50 μs, 300 μs |
| Equ. Input Noise [/√Hz] | 20 pA, 2.3 pA, 450 fA, 130 fA, 43 fA, 13 fA, 4.3 fA, 13 pA, 1.8 pA, 440 fA, 130 fA, 43 fA, 13 fA, 4.3 fA |
| Accuracy | Transimpedance (Gain) ±1 % |
| Low Pass Filter | 2 settings: full bandwidth and 10 Hz |
| Output Range | ±10 V, ±30 mA |
| Bias Voltage Range | ±10 V, max. 22 mA, connected to shield of BNC input socket, switchable to GND |
| Power Supply | ±15 V, +120 mA / −80 mA typ. |
| Control Interface | 5 opto-isolated digital inputs, TTL/CMOS compatible, analog voltage input for offset control |
| Case | 170 x 60 x 45 mm (L x W x H), weight 320 g (0.74 lbs) |
»MHz Speed
Offset adjustable by potentiometer or external control voltage. LED overload indication. Input protected against ±3 kV transients. 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®.
| Model | DHPCA-100 |
|---|---|
| Performance Range | Low Noise High Speed |
| Transimpedance [V/A] | 102, 103, 104, 105, 106, 107, 103, 104 105, 106, 107, 108 |
| Bandwidth (−3 dB) [MHz] | 200, 80, 14, 3.5, 1.8, 0.22, 175, 80, 14, 3.5, 1.8, 0.22 |
| Rise Time (10 % – 90 %) | 1.8 ns, 4.4 ns, 25 ns, 0.1 μs, 0.2 μs, 1.6 μs, 2.0 ns, 4.4 ns, 25 ns, 0.1 μs, 0.2 μs, 1.6 μs |
| Equ. Input Noise [/√Hz] | 220 pA, 17 pA, 2.2 pA, 490 fA, 140 fA, 51 fA, 155 pA, 6.1 pA, 1.5 pA, 440 fA, 140 fA, 51 fA |
| Accuracy | Transimpedance (Gain) ±1 % |
| Low Pass Filter | 3 settings: full bandwidth, 10 MHz and 1 MHz |
| Output Range | ±1 V @ 50 Ω load |
| Bias Voltage Range | ±10 V, max. 22 mA, connected to BNC-shield, switchable to GND |
| Power Supply | ±15 V, +110 mA / −90 mA |
| Control Interface | 7 opto-isolated digital inputs, TTL/CMOS compatible, analog voltage input for offset control |
| Case | 170 x 60 x 45 mm (L x W x H), weight 320 g (0.74 lbs) |
»Ultra Low-Noise Current Amplifier
- Input noise down to 180 aA/√Hz
- Bandwidth up to 400 kHz
- Gain up to 1013 V/A
- Flat frequency response
- EMI-shielded case
APPLICATIONS
- Photodetector amplifier
- Spectroscopy
- Scanning tunneling microscopy (STM)
- Ionization detectors
- Pyro- and piezoelectric detectors
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®.
| Model | −3 dB Bandwidth (DC …) | Noise Current [/√Hz] | Transimpedance (Gain) | Rise/Fall Time |
|---|---|---|---|---|
| LCA-2-10T | 2 Hz | 0.18 fA | 10(12) and 10(13) V/A | 200 ms |
| LCA-30-1T | 30 Hz | 0.5 fA | 1 x 10(12) V/A | 12 ms |
| LCA-30-200G | 30 Hz | 0.5 fA | 2 x 10(11) V/A | 12 ms |
| LCA-200-100G | 200 Hz | 1.5 fA | 1 x 10(11) V/A | 2 ms |
| LCA-200-10G | 200 Hz | 1.5 fA | 1 x 10(10) V/A | 2 ms |
| LCA-1K-5G | 1 kHz | 3 fA | 5 x 10(9) V/A | 400 μs |
| LCA-2K-2G | 2 kHz | 4.5 fA | 2 x 10(9) V/A | 200 μs |
| LCA-4K-1G | 4 kHz | 6.5 fA | 1 x 10(9) V/A | 100 μs |
| LCA-10K-500M | 10 kHz | 10 fA | 5 x 10(8) V/A | 40 μs |
| LCA-20K-200M | 20 kHz | 14 fA | 2 x 10(8) V/A | 20 μs |
| LCA-40K-100M | 40 kHz | 19 fA | 1 x 10(8) V/A | 10 μs |
| LCA-100K-50M | 100 kHz | 30 fA | 5 x 10(7) V/A | 4 μs |
| LCA-200K-20M | 200 kHz | 40 fA | 2 x 10(7) V/A | 2 μs |
| LCA-400K-10M | 400 kHz | 65 fA | 1 x 10(7) V/A | 1 μs |
»High-Speed Current Amplifier
- Input noise down to 270 fA/√Hz
- Bandwidth up to 400 MHz
- Gain up to 106 V/A
- Flat frequency response
- Stabilized and adjustable bias voltage output for biasing external photodiodes
- EMI-shielded case
APPLICATIONS
- Fast detection with large area photodiodes
- Spectroscopy
- Photodetection with PMTs and photodiodes
- Ionization detectors
- Pyro- and piezoelectric detectors
Output voltage ±1.5 V, @ 50 Ω load. Offset adjustable by trimpot. Output short-circuit protected. Adjustable bias-output (−12 V … +12 V) for biasing photodetectors. 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.
NOTE: The maximum detector capacitance listed above means that up to this value the specified −3dB-bandwidth (±15 %) is guaranteed. Larger capacitances are also possible, but will slightly influ- ence the bandwidth and frequency response.
For the ultra fast models HCA-100M-50K-C, HCA-200M-20K-C and HCA-400M-5K-C a reduction in bandwidth up to 25 % of the nominal values might occur if the source capacitance reaches the above noted maximum source capacitance values. Especially for these models short cables at the input and the use of low capacitance sources is of major importance. For further infor- mation please view the datasheet or contact FEMTO®.
| Model | −3 dB Band-width (DC …) | Noise Current [/√Hz] | Transim- pedance (Gain) | Rise/Fall Time | Max. Source Capaci- tance |
|---|---|---|---|---|---|
| HCA-1M-1M | 1 MHz | 270 fA | 1 x 10(6) V/A | 350 ns | 50 pF |
| HCA-1M-1M-C | 1 MHz | 3.5 pA | 1 x 10(6) V/A | 350 ns | 2 nF |
| HCA-2M-1M | 2 MHz | 340 fA | 1 x 10(6) V/A | 180 ns | 25 pF |
| HCA-2M-1M-C | 2 MHz | 3.5 pA | 1 x 10(6)V/A | 180 ns | 1 nF |
| HCA-4M-500K | 4 MHz | 490 fA | 5 x 10(5) V/A | 90 ns | 15 pF |
| HCA-4M-500K-C | 4 MHz | 3.5 pA | 5 x 10(5) V/A | 90 ns | 500 pF |
| HCA-10M-100K | 10 MHz | 1.1 pA | 1 x 10(5) V/A | 35 ns | 15 pF |
| HCA-10M-100K-C | 10 MHz | 3.5 pA | 1 x 10(5) V/A | 35 ns | 150 pF |
| HCA-20M-100K-C | 20 MHz | 3.5 pA | 1 x 10(5) V/A | 18 ns | 50 pF |
| HCA-40M-100K-C | 40 MHz | 3.7 pA | 1 x 10(5) V/A | 10 ns | 30 pF |
| HCA-100M-50K-C | 100 MHz | 3.8 pA | 5 x 104 V/A | 3.5 ns | 20 pF* |
| HCA-200M-20K-C | 200 MHz | 4.9 pA | 2 x 104 V/A | 1.9 ns | 8 pF* |
| HCA-400M-5K-C | 400 MHz | 21 pA | 5 x 103 V/A | 1 ns | 10 pF* |
