Variable Gain High Speed Transimpedance Amplifier (Current Amplifier) DHPCA-100


  • Transimpedance amplifier with gain from 102 to 10V/A
  • Bandwidth up to 200 MHz
  • Rise time down to 1.8 ns
  • Internal signal filters
  • Adjustable bias voltage
  • Manual and remote control
Performance RangeLow NoiseHigh Speed
-3 dB Bandwitdh [MHz]20080143.51.80.2217580143.51.80.22
Rise Time (10 % – 90 %)1.8 ns4.4 ns25 ns0.1 µs0.2 µs1.6 µs2.0 ns4.4 ns25 ns0.1 µs0.2 µs1.6 µs
Equ. Input Noise [/√Hz]180 pA11 pA1.8 pA480 fA140 fA45 fA155 pA5.8 pA1.5 pA440 fA140 fA45 fA
Accuracy PerformanceGain ±1 %
Low Pass FilterSwitchable to 1 MHz, 10 MHz or full bandwidth
Output±1 V @ 50 Ω Last
Bias Voltage±10 V, max. 22 mA, connected to BNC-shield, switchable to GND
Power Requirements±15 V, +110 mA / -90 mA typ., ±200 mA recommended
Control InterfaceOpto-isolated digital inputs, TTL/CMOS compatible, analog offset control voltage input
Case170 x 60 x 45 mm (L x W x H), Weight 320 g (0.74 lb.)

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.

The ultimate high speed transimpedance amplifier

The DHPCA-100 variable gain transimpedance 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.

The DHPCA-100 offers many features including variable 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 low pass 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 103 V/A it provides an extraordinary high 3 dB bandwidth of 200 MHz and even at the highest gain setting of 108 V/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 low pass filter to minimize broadband noise.


  • Current to voltage converter for current measurement
  • Photodetector amplifier
  • Fast ionization detection
  • Spectroscopy
  • Preamplifier for oscilloscopes, A/D converters and RF lock-in amplifiers

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Power Supply

USB Control Interface LUCI-10