Driving the future of technology : Original solution in measurement and control

 Lecture for Measurement

Posted 2020/2/26

DC-power-supply (AC-DC power supply)

Examples of improved measurement and evaluation by using a low-noise DC power supply

2. Stability improvement of voltage-controlled crystal oscillator

For voltage-controlled high precision devices, such as crystal oscillators, the noise and stability of the control voltage directly affect the performance of the device.
For product inspection and evaluation of such voltage-controlled devices, it is important to use a low-noise and high stable voltage source.
Noise generated by the control voltage source affects the frequency of the crystal oscillator. The deviation in output frequency is measured by the system shown in Figure 3.

Figure 3: Evaluation system for output frequency of voltage-controlled crystal oscillator.

    Measurement conditions
  • TCVCXO center frequency: about 30 MHz; measurement period: 1 Hz; number of measurements: 40,000; total measurement time: about 11 hours; ambient temperature: 23 ±5°C.

As shown in Figure 4, when using our low-noise power supply LP5394, the variation of output frequency is lower than half when compared to using a general linear regulator type power supply.

Thus, even if the device is the same, the quality of the power supply causes a difference in the variation of output frequency.
Therefore, it is necessary to pay attention to the quality of the power supply when evaluating the devices witch requires voltage control.

Figure 4: Difference due to control voltage source for TCVCXO output frequency variation.

Related Product

Low Noise DC Voltage Source LP6016-01/P

Bias-voltage and control-voltage source for sensors and devices.

  •  Low noise: 10 µV/√Hz (Bandwidth: 10 Hz to 20 MHz)
  •  High stability: ±10 ppm/°C
  •  Setting accuracy: ±(0.03%+250µ V)
  •  Output voltage: 0 to +16.1 V (LP6016-01)
         0 to +16.1 V x 2ch (LP6016-01P)
  •  Output current: 100 mA
  •  External control interface: USB, RS-232, LAN



Related keywords :  Low Noise DC Voltage Source

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