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The Ultimate Low-Noise Current Amplifier

  • 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
  • Bias-Voltage Adjustable
  • Manual and Remote Control

The Ultimate Low-Noise Current Amplifier

Packed with features the DLPCA-200 Variable Gain Transimpedance Amplifier is designed for a wide range of applications that require the conversion of small currents into usable voltages. It is ideally suited, for example, for DC measurements, time resolved measurements down to the μs-region and as the preamplifier for photodiodes or lock-in systems. The DLPCA-200 offers virtually all of the features that can be expected from a high-end current amplifier including selectable transimpedance gain from 103 to 1011 V/A, switchable AC/DC-coupling, adjustable bias-voltage and offset, switchable 10 Hz lowpass filter and the capability of manual and opto-isolated remote control. All this in a rugged, compact EMI-shielded case, designed with the user in mind and built to guarantee trouble-free operation even in very rough and noisy environments.

Bandwidth and Frequency Response independent of Source Capacitance
Unlike similar amplifiers available the DLPCA-200 requires no particular adaptation, such as frequency compensation for different sources. In addition, it provides maximum speed even in high gain settings. At the highest gain setting of 1011 V/A it provides a 3 dB-bandwidth of 1.2 kHz and a 300 ?s rise time. For those applications not requiring the full bandwidth, the unit has a switchable 10 Hz lowpass filter to eliminate wideband noise and thus allowing accurate and ultra low-noise DC current measurements down to femtoAmperes.

Applications for DLPCA-200 Current Amplifier

  • Photodiode and Photomultiplier Amplifier
  • Scanning Tunneling Microscopy (STM)
  • Spectroscopy
  • Charge Amplifier
  • Ionization Detectors
  • Preamplifier for Lock-Ins, A/D-Converters etc.

Low Noise Input/Output Cable: FEMTO CAB-LN1 low noise cable

The LUCI-10 amplifier interface allows remote control of FEMTO amplifiers and photoreceivers with a remote control capability from a standard Windows PC with USB port.

Variable Gain Current Amplifier Comparison

Performance RangeLow NoiseHigh Speed
Transimpedance [V/A]10310410510610710810910510610710810910101011
Bandwidth [- 3 dB] [kHz] 5005004002005071.15005004002005071.1
Rise Time(10%-90%)700ns700ns900ns1.8μs7μs50μs300μs700ns700ns900ns1.8μs7μs50μs300μs
Equ. Input Noise [/Hz1/2]20 pA2.3 pA450 fA130 fA43 fA13 pA4.3 fA13 fA1.8fA440 fA130 fA43 fA13 fA4.3 fA
Accuracy PerformanceGain +1 %, Flatness 0.1 dB
Lowpass FilterSwitchable to 10 Hz
Output Performance+10 V >1MΩ load
BIAS VoltageAdjustable +10 V, max. 22 mA, Connected to BNC-Shield, switchable to GND
Power Supply+15 V, +120 mA/-80 mA Typ.
Control Interface5 Opto-Isolated Digital Inputs, TTL/CMOS compatible, Analog Offset Control Voltage Input
Interface Software OptionLUCI-10 Control Interface Software & Hardware Option
Case170 x 60 x 45 mm (L x W x H), Weight 320 g (0.74 lbs)
Bandwidth and rise/fall times are independent of detector capacitance up to 1 nF. Offset adjustable by trimpot 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 is available. For further information please view the datasheet.

FEMTO Product Catalog

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