Features
- Input noise down to 270 fA/√Hz
- Bandwidth up to 400 MHz
- Transimpedance amplifiers with gain up to 106 V/A
- Flat frequency response
- Stabilized and adjustable bias voltage output for biasing external photodiodes
- EMI-shielded case
| Model | -3 dB Bandwidth (DC …) | Noise Current | Transimpedance (Gain) | Rise / Fall Time | Maximum Source Capacitance | Datasheet |
|---|---|---|---|---|---|---|
| HCA-1M-1M | 1 MHz | 270 fA/√Hz | 1 x 106 V/A | 350 ns | 50 pF | Download |
| HCA-1M-1M-C | 1 MHz | 3.5 pA/√Hz | 1 x 106 V/A | 350 ns | 2 nF | Download |
| HCA-2M-1M | 2 MHz | 340 fA/√Hz | 1 x 106 V/A | 180 ns | 25 pF | Download |
| HCA-2M-1M-C | 2 MHz | 3.5 pA/√Hz | 1 x 106 V/A | 180 ns | 1 nF | Download |
| HCA-4M-500K | 4 MHz | 490 fA/√Hz | 5 x 105 V/A | 90 ns | 15 pF | Download |
| HCA-4M-500K-C | 4 MHz | 3.5 pA/√Hz | 5 x 105 V/A | 90 ns | 500 pF | Download |
| HCA-10M-100K | 10 MHz | 1.1 pA/√Hz | 1 x 105 V/A | 35 ns | 15 pF | Download |
| HCA-10M-100K-C | 10 MHz | 3.5 pA/√Hz | 1 x 105 V/A | 35 ns | 150 pF | Download |
| HCA-20M-100K-C | 20 MHz | 3.5 pA/√Hz | 1 x 105 V/A | 18 ns | 50 pF | Download |
| HCA-40M-100K-C | 40 MHz | 3.7 pA/√Hz | 1 x 105 V/A | 10 ns | 30 pF | Download |
| HCA-100M-50K-C | 100 MHz | 3.8 pA/√Hz | 5 x 104 V/A | 3.5 ns | 20 pF* | Download |
| HCA-200M-20K-C | 200 MHz | 4.9 pA/√Hz | 2 x 104 V/A | 1.9 ns | 8 pF* | Download |
| HCA-400M-5K-C | 400 MHz | 21 pA/√Hz | 5 x 103 V/A | 1 ns | 10 pF* | Download |
High frequency – only for specialists?
Users of high frequency components are often confronted with problems including unwanted oscillation, poor ground shielding, nonlinearities, gain peaking and bandwidth reduction caused by poorly designed amplifiers. FEMTO High Frequency Amplifiers have been designed to eliminate such unwanted problems. Insensitive to signal source parameters and input wiring, FEMTO High Frequency Amplifiers perform meticulously within their specifications. No gain peaking, oscillation or significant bandwidth reduction will occur, even for source capacitances up to maximum 2 nF (for the HCA-1M-1M-C).
Bandwidth independent of source capacitance
Merely a few picofarads of source capacitance can drastically decrease the bandwidth of high frequency current amplifiers. However, FEMTO Current Amplifiers do not have this limitation and are not influenced by a wide range of source capacitances. No frequency compensation or special adaptation is needed and the bandwidth and gain are constant up to the maximum source capacitance specified for each model.
C-Models
Amplifier models shown with an additional C are optimized for handling very large source capacitances up to nanofarads. They are very useful for measuring fast signals down to nanoseconds with large area detectors.
Transimpedance amplifiers with adjustable offset and bias voltage
For a high degree of flexibility FEMTO’s HCA transimpedance amplifiers offer precise offset and bias control by two trimpots. The wide range of the adjustable input offset current compensation preserves full dynamics even for signals with large DC-components. The voltage at the bias-output can be adjusted precisely from -12 to +12 Volts using the multi turn bias-trimpot.
Applications
- Current to voltage converter for current measurement
- Fast detection with large area photodiodes
- Spectroscopy
- Photodetection with PMTs and photodiodes
- Ionization detectors
- Pyro- and piezoelectric detectors
