Abstract
This paper describes the design and implementation of low phase noise 10-MHz crystal oscillators [using stress compensated (SC) cut crystal resonators] which are being used as a part of the chain of a local oscillator for use in compact atomic clocks. The design considerations and phase noise measurements are presented. The design includes a low-noise transformer coupled differential amplifier, spurious resonance rejection filter, and electronically tuned phase shifter. Phase noise measurements demonstrate a performance of −122 dBc to −123 dBc/Hz at 1-Hz offsets and −148 dBc/Hz at 10-Hz offsets. The phase noise at 1-Hz offset is very similar to the phase noise produced by the low-noise version of a doubled 5-MHz BVA resonator-based oscillators (model number 8607) previously produced by Oscilloquartz. The noise floor of the oscillators presented in this paper is around −161 dBc/Hz. These designs can be used as the reference oscillator to control the timing of many modern electronics systems.
| Original language | English |
|---|---|
| Pages (from-to) | 181-191 |
| Number of pages | 11 |
| Journal | IEEE Transaction of Ultrasonics Ferroelectrics and Frequency Control |
| Volume | 66 |
| Issue number | 1 |
| Early online date | 19 Nov 2018 |
| DOIs | |
| Publication status | Published - Jan 2019 |
Keywords
- phase noise
- crystals
- resonators
- 1/f noise
- noise measurement
- low noise crystal oscillators
- low noise oscillators
- oscillators
- noise
- Frequency control
