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 time resolved current and charge measurements down to the µs region and as preamplifier for photodiodes or lock-in systems. The DLPCA-200 offers variable transimpedance gain from 103 to 1011 V/A allowing the sensitive measurement of currents in the sub-pico to milli amp range. Its switchable AC/DC coupling, 10 Hz low pass filter and adjustable offset control can be used to adapt the amplifier to varying measurement tasks and signal conditions. An adjustable bias voltage connected to the shield of the input socket is provided to optimize the speed and noise performance of external photodiodes connected to the amplifier input.
All functions can be set either manually by switches or through the opto-isolated interface by remote control. All this in a rugged and compact EMI shielded case designed with the user in mind and built to guarantee trouble-free operation even in very rough and noisy environments.
Unlike other amplifiers available the DLPCA-200 requires no particular adaptation such as frequency compensation for different sources. The gain stays constant and the frequency response is nicely flat even for high source capacitances up to 1 nF. Common issues such as gain peaking or even oscillations are avoided by the careful amplifier design and thorough testing of the units prior to shipment.
In addition the DLPCA-200 provides high speed even for large gain settings. At the highest gain setting of 1011 V/A it provides a 3 dB bandwidth of 1.1 kHz and a 300 µs rise time. For low frequency applications not requiring the full bandwidth the unit has a switchable 10 Hz low pass filter to eliminate wideband noise and thus allowing accurate and ultra low noise DC current measurements down to femto amps.
|Performance Range||Low Noise||High Speed|
(−3 dB) [kHz]
(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
|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 Performance||Gain ±1 %, flatness 0.1 dB|
|Low Pass Filter||Switchable to 10 Hz|
|Output Performance||±10 V, ±30 mA|
|Bias Voltage||±10 V, max. 22 mA, connected to shield of BNC input socket, switchable to GND|
|Power Supply||±15 V, +120 mA / −80 mA typ., ±200 mA recommended|
|Control Interface||5 opto-isolated digital inputs, TTL/CMOS compatible, analog offset control voltage input|
|Case||170 x 60 x 45 mm (L x W x H), Weight 320 g (0.74 lb.)|
|View and Download Datasheet||203 kB|
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 available. For further information please view the datasheet or contact FEMTO.
The DHPVA voltage amplifier series has been revised, resulting in the new models DHPVA-101 (DC - 100 MHz) and DHPVA-201 (DC - 200 MHz). Input voltage drift and noise are improved to an extraordinary low level while still convincing with a constant bandwidth at any gain setting.
The photoreceiver series HSA-X-S was broadened by two models featuring an improvement in noise performance of up to 40%. The output reflection coefficient was reduced by 8 dB at the same time.
FEMTO® Messtechnik GmbH
Phone: +49-(0)30-280 4711-0
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