Latest results in the development of an ultra-low phase noise Rb CPT vapour cell atomic clock

2017 ◽  
Author(s):  
Tsvetan Burtichelov ◽  
Jeremy Everard
Keyword(s):  
Phase Noise ◽  
Atomic Clock ◽  
Low Phase Noise

scholarly journals A low phase noise microwave source for high‐performance CPT Rb atomic clock

2021 ◽  
Author(s):  
Xiaodong Li ◽  
Peter Yun ◽  
Qinglin Li ◽  
Bowen Ju ◽  
Shaoshao Yu ◽  
...  
Keyword(s):  
Phase Noise ◽  
High Performance ◽  
Atomic Clock ◽  
Microwave Source ◽  
Low Phase Noise

Phase noise analysis of voltage controlled oscillator used in cesium atomic clock

2017 ◽  
Vol 31 (07) ◽  
pp. 1741005 ◽  
Author(s):  
Menghui Zhi ◽  
Liang Tang ◽  
Donghai Qiao
Keyword(s):  
Phase Noise ◽  
Noise Analysis ◽  
Phase Fluctuation ◽  
Atomic Clock ◽  
Frequency Standard ◽  
Low Noise ◽  
Voltage Controlled Oscillator ◽  
Reverse Bias Voltage ◽  
Cesium Frequency Standard ◽  
Low Phase Noise

Coherent population trapping (CPT) cesium frequency standard plays a significant role in precision guidance of missile and global positioning system (GPS). Low noise 4.596 GHz voltage controlled oscillator (VCO) is an indispensable part of microwave signal source in cesium frequency standard. Low-phase noise is also the most important and difficult performance indicator of VCO. Starting from phase noise analysis method proposed by Leeson, the formulas about the relationship between phase noise of output signal of oscillator feedback model and phase fluctuation spectrum of amplifier, phase noise of oscillator are derived in this paper. Finally, the asymptote model of microwave oscillator is proposed based on the formula derivation. The experiment shows that when the reverse bias voltage of variode is 1.8 V, the designed oscillation frequency of VCO is 4.596 GHz, the power is −1 dBm and the DC power consumption is 19.6 mW. The tendency of phase noise simulation curve and actual test curve conform to asymptote model. The phase noise in 1 and 10 kHz is, respectively, −60.86 and −86.58 dBc/Hz. The significance of the paper lies in determining the main factors influencing oscillator phase noise and providing guiding direction for the design of low-phase noise VCO.

Power Efficient Implementation of Low Noise CMOS LC VCO using 32nm Technology for RF Applications

2018 ◽  
Vol 6 (8) ◽  
pp. 53
Author(s):  
Shitesh Tiwari ◽  
Sumant Katiyal ◽  
Parag Parandkar
Keyword(s):  
Power Consumption ◽  
Phase Noise ◽  
Tuning Range ◽  
Low Voltage ◽  
Performance Comparison ◽  
Low Noise ◽  
Center Frequency ◽  
Voltage Controlled Oscillator ◽  
Low Phase Noise ◽  
Lc Vco

Voltage Controlled Oscillator (VCO) is an integral component of most of the receivers such as GSM, GPS etc. As name indicates, oscillation is controlled by varying the voltage at the capacitor of LC tank. By varying the voltage, VCO can generate variable frequency of oscillation. Different VCO Parameters are contrasted on the basis of phase noise, tuning range, power consumption and FOM. Out of these phase noise is dependent on quality factor, power consumption, oscillation frequency and current. So, design of LC VCO at low power, low phase noise can be obtained with low bias current at low voltage.  Nanosize transistors are also contributes towards low phase noise. This paper demonstrates the design of low phase noise LC VCO with 4.89 GHz tuning range from 7.33-11.22 GHz with center frequency at 7 GHz. The design uses 32nm technology with tuning voltage of 0-1.2 V. A very effective Phase noise of -114 dBc / Hz is obtained with FOM of -181 dBc/Hz. The proposed work has been compared with five peer LC VCO designs working at higher feature sizes and outcome of this performance comparison dictates that the proposed work working at better 32 nm technology outperformed amongst others in terms of achieving low Tuning voltage and moderate FoM, overshadowed by a little expense of power dissipation. 

Design of wideband discrete VCO with low phase noise

2011 ◽  
Vol 25 (9) ◽  
pp. 817-822
Author(s):  
Zhiqiang Wei ◽  
Zushen Liu ◽  
Wu Huang ◽  
Shu Liu
Keyword(s):  
Phase Noise ◽  
Low Phase Noise
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