Variable Gain, Sub Femto Ampere Current Amplifier DDPCA-300

The variable gain sub-femto ampere amplifier DDPCA-300 is the latest addition to FEMTO's broad range of low noise transimpedance amplifiers. Its exceptional design achieves input noise values down to 0.2 fA/√Hz and 0.4 fA peak-peak. The gain can be set over a very wide range from 104 up to 1013 V/A either manually or by a remote interface. Thus, the amplifier covers a large dynamic range of more than 240 dB for the measurement of currents from sub femto amps up to milli amps by simply switching the gain range. The compact housing is optimised for use close to the signal source avoiding signal perturbations or noise pick-up due to long cables. Various filters are integrated to adapt the amplifier bandwidth to varying signal conditions. Thus, the signal to noise ratio and measurement speed can be optimised by selecting the proper filter setting for a specific application, even in the highest gain settings the measurement speed is sufficient to measure femto amp currents in real-time without the need for external averaging or long test periods. The LUCI-10 is available as an additional product used as a USB interface.

 

Applications include I/V Characterisation of MOS and JFET Structures, Quantum and Biotech Experiments, Spectroscopy, Charge measurements, high resistance measurements, easy-to-use Femto Amp Add-on to Existing Digital Voltmeter or A/D Converter.