Posted 2020/2/26
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.
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 keywords : Low Noise DC Voltage Source
