Features

• 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.
Datasheet	291 kB	285 kB	299 kB	299 kB	300 kB	300 kB
Output	<100 Ω, BNC
Output Voltage	±10 V (@ 100 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