CURRENT / TRANSIMPEDANCE AMPLIFIERS





  • »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.





  • »Variable Gain High-Speed Current Amplifier

    • Variable transimpedance gain from 102 to 108 V/A
    • Bandwidth up to 200 MHz
    • Rise time down to 1.8 ns
    • Adjustable bias voltage
    • Manual and remote control

    APPLICATIONS

    • Photodetector amplifier
    • Fast ionization detection
    • Spectroscopy
    • Preamplifier for oscilloscopes, A/D converters and RF lock-in amplifiers

    For detailed information about DDPCA-300, DLPCA-200, and DHPCA-100 see next page!





  • »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®.


    ModelDDPCA-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
    AccuracyTransimpedance (Gain) ±1 %
    Low Pass Filter 3 settings: full bandwidth, 0.7 Hz and 0.1 Hz
    Output Range ±10 V, ±30 mA
    Bias Voltage Range ±10 V, max. 10 mA, connected to amplifier input, adjustable by trimpot or remote control voltage
    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
    Case170 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 fA1 x 10(12) V/A 12 ms
    LCA-30-200G 30 Hz 0.5 fA2 x 10(11) V/A 12 ms
    LCA-200-100G 200 Hz 1.5 fA1 x 10(11) V/A 2 ms
    LCA-200-10G 200 Hz 1.5 fA1 x 10(10) V/A 2 ms
    LCA-1K-5G1 kHz 3 fA 5 x 10(9) V/A 400 μs
    LCA-2K-2G2 kHz 4.5 fA2 x 10(9) V/A 200 μs
    LCA-4K-1G 4 kHz6.5 fA 1 x 10(9) V/A 100 μs
    LCA-10K-500M 10 kHz 10 fA5 x 10(8) V/A40 μs
    LCA-20K-200M 20 kHz 14 fA 2 x 10(8) V/A 20 μs
    LCA-40K-100M 40 kHz 19 fA1 x 10(8) V/A 10 μs
    LCA-100K-50M 100 kHz 30 fA5 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 fA1 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 TimeMax. Source Capaci- tance
    HCA-1M-1M 1 MHz 270 fA1 x 10(6) V/A 350 ns 50 pF
    HCA-1M-1M-C 1 MHz 3.5 pA1 x 10(6) V/A 350 ns2 nF
    HCA-2M-1M 2 MHz 340 fA1 x 10(6) V/A 180 ns 25 pF
    HCA-2M-1M-C 2 MHz 3.5 pA1 x 10(6)V/A 180 ns 1 nF
    HCA-4M-500K 4 MHz 490 fA5 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 pA1 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 MHz3.5 pA 1 x 10(5) V/A 18 ns50 pF
    HCA-40M-100K-C 40 MHz 3.7 pA1 x 10(5) V/A 10 ns 30 pF
    HCA-100M-50K-C100 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*