Quad-channel bipolar voltage source

Quad channel bipolar voltage source
Quad channel bipolar voltage source Temperature coefficient Voltage stability Voltage noise density Current driving capability

Koheron VREF100 is a quad-channel voltage source that can be adjusted between -5 V and +5 V. It can source or sink up to 40 mA on each channel. Each channel has a coarse and a fine trimmer with a settability of 20 µV. Thanks to its low wideband noise and high stability, the VREF100 can be used to bias sensitive devices such as VCOs or Mach-Zehnder modulators.

645 €


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Number of channels 4
Output voltage range ±5 V
Current driving capability 40 mA (source or sink)
Voltage noise density (10 kHz) 1.3 nV/√Hz
RMS noise (10 Hz - 1 MHz) 2 µV
24 h stability 50 µV
Load regulation 35 µV/mA
Temperature coefficient 5 ppm/°C
Fine ajustment range ±50 mV
Outside Dimensions 75 mm x 50 mm x 12 mm
Weight 34 g
Supply voltage ±9 V
Operating temperature 0 °C - 40 °C

Temperature coefficient

The graph below shows the variation of the output voltage of the VREF100 (set to -4 V) when the temperature varies from 0 to 60 °C. Temperature coefficient is about 10 µV/°C.

VREF100 temperature coefficient

Voltage stability

Voltage stability of the VREF100 has been measured at a temperature of 25 °C and an output voltage of -4 V over 24 hours:

VREF100 voltage stability

The corresponding Allan deviation is shown below. A minimum Allan deviation of 300 nV is seen between 5 and 100 seconds.

VREF100 Allan deviation

Voltage noise density

The graph below shows the output voltage noise density of the VREF100 when driving a 100 Ω load at different output voltages.

VREF100 voltage noise density

Current driving capability

At 4 V output voltage, the VREF100 sources or sinks up to 60 mA. At -4 V output voltage, it sinks up to 40 mA and sources up to 60 mA.

VREF100 current driving capability

Application: Voltage Controlled Oscillator (VCO) control

We used the VREF100-50 to control a Minicircuits ROS-2500 Voltage Controlled Oscillator. The VCO is controlled with 4 V, which gives a VCO output frequency of 1.7 GHz.

VREF100 VCO control

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