Quad-channel bipolar voltage source
Koheron VREF100 is a quad-channel voltage source that can be adjusted from -5 V to 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.
| Quantity | Price |
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Resources
Specifications
| VREF100-50 | |
|---|---|
| Number of channels | 4 |
| Output voltage range | -5 V to 5 V |
| Current driving capability | 40 mA (source or sink) |
| Voltage noise density(10 kHz) | 1.3 nV/√Hz |
| RMS noise(10 Hz to 1 MHz) | 2 µVrms |
| 24 h stability | 50 µV |
| Load regulation | 35 µV/mA |
| Temperature coefficient | 5 ppm/°C |
| Fine ajustment range | ±50 mV |
| Other | |
| Outside dimensions | 75 mm x 50 mm x 12 mm |
| Weight | 34 g |
| Positive supply voltage | 9 V |
| Negative supply voltage | -9 V |
| Operating temperature | 0 °C to 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.
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:
The corresponding Allan deviation is shown below. A minimum Allan deviation of 300 nV is seen between 5 and 100 seconds.
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.
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.
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.
