Citation
Abstract
This article describes a power supply conditioning circuit that can reduce Periodic And Random Deviations (PARD) on the output voltages of DC power supplies to -150 dBV (32 nanovolts/Hz) from DC to several KHz with no measurable periodic deviations. The PARD for a typical commercial low noise power supply is -74 dBV (200 microvolts/ /Hz) for frequencies above 20 Hz and is often much worse at frequencies below 20 Hz. The power supply conditioning circuit described in this article relies on the large differences in the dynamic impedances of a constant current diode and a zener diode to establish a DC voltage with low PARD. Power supplies with low PARD are especially important in circuitry involving ultrastable frequencies for the DSN.
Details
- Volume
- 42-90
- Published
- August 15, 1987
- Pages
- 1–7
- File Size
- 391.0 KB