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Variable-Gain Low-Noise Current Amplifier


DLPCA-200: 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)
Charge Amplifier
Ionization Detectors
Preamplifier for Lock-Ins, A/D-Converters etc.

Low Noise Input/Output Cable: 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

  Click Part # to view pdf datasheet.
Model DLPCA-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 1.8μs 7μs 50μs 300μs 700 ns 700 ns 900 ns 1.8μs 7μs 50μs 300μs
Equ. Input Noise [/Hz1/2] 20 pA 2.3 pA 450 fA 130 fA 43 fA 13 fA 4.3 fA 13 pA 1.8 pA 440 fA 130fA 43 fA 13 fA 4.3 fA
Accuracy Performance Gain +1 %, Flatness 0.1 dB
Lowpass Filter Switchable to 10 Hz
Output Performance +10 V >1MΩ load
BIAS Voltage Adjustable +10 V, max. 22 mA, Connected to BNC-Shield, switchable to GND
Power Supply +15 V, +120 mA/-80 mA Typ.
Control Interface 5 Opto-Isolated Digital Inputs, TTL/CMOS compatible, Analog Offset Control Voltage Input
Interface Software Option LUCI-10 Control Interface Software & Hardware Option
Case 170 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 (pdf)

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