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Variable-Gain High-Speed Current Amplifier

The Ultimate High Speed Current Amplifier
DHPCA-100 Series

The DHPCA-100 variable gain high speed transimpedance current amplifier is the perfect choice for applications that require the conversion of small electrical currents into usable voltages at bandwidths up to 200 MHz. It is ideally suited for DC- and AC measurements up to 200 MHz, time resolved measurements down to the ns-region and as the preamplifier for fast photodetector signals.

  • Transimpedance Gain from 102 to 10V/A
  • New: Bandwidth up to 200 MHz
  • Rise Time down to 1.8 ns
  • Internal Signal Filters
  • Adjustable Bias Voltage
  • Manual and Remote Control

The DHPCA-100 offers many features including selectable gain from 102 to 108 V/A, switchable AC/DC-coupling, adjustable offset for baseline correction, adjustable bias voltage for use with fast photodiodes, switchable 10 MHz and 1 MHz lowpass filters and the capability of both manual and remote control. With its rugged and compact EMI-shielded case the DHPCA-100 is the ideal universal high speed amplifier for a broad range of applications.

Bandwidth and Frequency Response
The DHPCA-100 provides an optimum combination of gain and bandwidth. At the gain setting of 10V/A it provides an extraordinary high 3 dB-bandwidth of 200 MHz and even at the highest gain setting of 10V/A the upper cut-off frequency is still an excellent 220 kHz. For those applications not requiring the full bandwidth the unit has a switchable 10 MHz and 1 MHz lowpass filter to minimize broadband noise.


  • Photodetector Amplifier
  • Fast Ionization Detection
  • Spectroscopy
  • Preamplifier for Oscilloscopes, A/D-Converters and RF Lock-In Amplifiers.

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

Selector for Variable Gain, High Speed Current Amplifiers

ModelDHPCA 100
Performance RangeLow NoiseHigh Speed
Transimpedance [V/A]102103104105106107103104105106107108
Bandwidth [- 3 dB] [MHz] 20080143.51.80.2217580143.51.80.22
Rise Time(10%-90%)1.8ns4.4ns25ns0.1μs0.2μs1.6μs2.0ns4.4ns25ns0.1μs0.2μs1.6μs
Equ. Input Noise [/Hz1/2]200 pA16 pA2.1 pA500 fA170 fA60 pA140 pA6.0 pA1.5 pfA450 fA150 fA55 fA
Lowpass FilterSwitchable to 1 MHz, 10 HMz or Full Bandwidth
Output Performance±1 V @ 50Ω load
BIAS VoltageAdjustable +10 V, max. 22 mA, Connected to Shield of BNC Input Socket, switchable to GND
Power Supply±15 V, +110 mA/-90 mA Typ.
Control InterfaceOpto-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)
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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