Low-Frequency
Voltage Amplifiers
Series DLPVA
  • Switchable Gain up to 100 dB (x 100,000)
  • Bandwidth DC to 100 kHz
  • DC-Drift 0.6 µV/°C
  • Input Noise down to 0.4 nV/√Hz
  • Switchable AC/DC-Coupling
  • Local and Remote Control
  • Input Impedance up to 1 TΩ

 

Offset Drift


The temperature drift of the input offset voltage is one of the decisive characteristics for the quality of a DC voltage amplifier. FEMTO Voltage Amplifiers have the DC performance of precision amplifiers. Therefore, even the 100 dB gain is well suited for DC-coupling without the need for permanent offset voltage adjustments.
Bandwidth


The bandwidth of an ideal variable gain amplifier is independent of the gain setting which is very important for measuring fast signals and pulses. The bandwidth of FEMTO`s DLPVA Amplifiers remains constant at 100 kHz (-3 dB) up to the highest gain setting. Wideband noise can be reduced by switching the upper cut-off-frequency to 1 kHz.
Controls

Parameters, e.g. gain settings, bandwidth etc. can all be controlled by local switches directly on the amplifier. Operation is straightforward and the chosen gain setting is displayed by LEDs. For remote control, each switch is provided with a corresponding TTL-Bit. Mixed operation is also possible.
Flexibility


Six different DLPVA models offer a high degree of flexibility. Our customers can choose either a single ended or a true differential input. The input impedance is 1 MΩ or lower for our bipolar models and an exceptional high 1 TΩ for our FET models allowing measurements of signals from very high impedance sources. Finally the noise is as low as 0.4 nV/√Hz for the model DLPVA-100-BUN-S.
Applications
  • Universal Low-Frequency Amplifier
  • Automated Measurements
  • Industrial Sensors
  • Detector Preamplifier
  • Integrated Measurement Systems
Model DLPVA-
100-BUN-S		 DLPVA-
100-BLN-S		 DLPVA-
100-B-S		 DLPVA-
100-B-D		 DLPVA-
100-F-S		 DLPVA-
100-F-D

Input stage

Single
Ended,
bipolar

Single
Ended,
bipolar

Single
Ended,
bipolar

True Diff.,
bipolar

Single
Ended,
FET

True Diff.,
FET

Input 1 kΩ,
BNC		 1 MΩ,
BNC		 1 MΩ,
BNC		 1 MΩ,
LEMO		 1 TΩ,
BNC		 1 TΩ,
LEMO
Typical Source Impedance < 50 Ω < 100 Ω < 1 kΩ < 1 kΩ < 1 GΩ < 1 GΩ
Lower
Cut-Off Frequency		 1.5 Hz
(AC only)		 DC/
1.5 Hz		 DC/
1.5 Hz		 DC/
1.5 Hz		 DC/
1.5 Hz		 DC/
1.5 Hz
Upper
Cut-Off Frequency [kHz]		 1/100 1/100 1/100 1/100 1/100 1/100
Gain [dB] 40/60/
80/100 		40/60/
80/100 		20/40/
60/80 		20/40/
60/80 		20/40/
60/80 		20/40/
60/80
Input Noise Voltage
[nV/√Hz]		 0.4 0.7 2.4 3.6 5.5 6.9
Input Voltage Drift
[µV/°C]		 - 0.5 0.7 0.7 1.3 1.3
CMRR - - - 120 dB max. - 120 dB max.
View and Download Datasheet 313 kB 319 kB 317 kB 317 kB 386 kB 386 kB
Output < 100 Ω, BNC
Output Voltage ± 10 V (@ 10 kΩ Load)
Digital Control TTL, CMOS, Opto-Isolated
Offset adjustable by trimpot or external control voltage. Indication of selected gain setting by LED. 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.

Typical Performance Characteristics


 

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