This product is discontinued.
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Ultra-low noise current amplifier
Koheron CNA100 is a current amplifier designed for the characterization of laser drivers. The ultra-low current noise floor of 120 pA/√Hz is obtained by sensing the voltage across a 5 Ω precision resistor with an instrumentation amplifier with less than 600 pV/√Hz input-referred voltage noise and 2.6 MHz bandwidth. The DC voltage across the precision resistor is also available on a screw terminal.
Resources
Specifications
| CNA100-500 | |
|---|---|
| Current amplifier | |
| Maximum current | 500 mA |
| Sensing resistor | 5 Ω |
| Noise floor | 120 pA/√Hz |
| Gain(low setting) | 10 kV/A |
| Gain(medium setting) | 50 kV/A |
| Gain(high setting) | 200 kV/A |
| Coupling | AC |
| 3 dB bandwidth | 2.6 MHz |
| AC cutoff frequency at 3 dB | 1.4 Hz |
| 0.1 dB bandwidth | 300 kHz |
| AC cutoff frequency at 0.1 dB | 10 Hz |
| Output impedance | 50 Ω |
| Other | |
| Outside dimensions | 63 mm x 53 mm x 13 mm |
| Weight | 31 g |
| Positive supply voltage | 6 V to 12 V |
| Negative supply voltage | -12 V to -6 V |
| Operating temperature | 0 °C to 50 °C |
Characterization
Noise floor
The figure below shows the input-referred current noise density of the CNA100-500 (no current was flowing across the 5 Ω sensing resistor).
Frequency response
Quickstart
- Supply +VCC with +6V and then -VCC with -6V.
- Connect the current to be sensed between IN+ and IN-. The current must flow from IN+ to IN-.
- The AC-coupled amplified output is available at the SMA connector. Gain depends on the jumper setting (low: 10 kV/A, med.: 50 kV/A, high: 200 kV/A).
- The DC voltage across the sense resistor can be sensed between the DC+ and DC- pins.
