Abstract
High phase noise is a common problem in ring oscillators. Continuous conduction of the transistor in an analog tuning method degrades the phase noise of ring oscillators. In this paper, a digital control tuning which completely switches the transistors on and off, and a 1/f noise reduction technique are employed to reduce the phase noise. A 14-bit control signal is employed to obtain a small frequency step and a wide tuning range. Furthermore, multiphase ring oscillator with a sub-feedback loop topology is used to obtain a stable quadrature outputs with even number of stages and to increase the output frequency. The measured DCO has a frequency tuning range from 554MHz to 2.405 GHz. The power dissipation is 112mW from 1.8V power supply. The phase noise at 4MHz offset and 2.4 GHz center frequency is -134.82 dBc/Hz. The FoM is -169.9 dBc/Hz which is a 6.3 dB improvement over the previous oscillator design.
| Original language | English |
|---|---|
| Pages (from-to) | 262-269 |
| Number of pages | 8 |
| Journal | IEICE Transactions on Electronics |
| Volume | E96-C |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 2013 |
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All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
Cite this
Low phase noise 14-bit digitally controlled CMOS quadrature ring oscillator. / Pokharel, Ramesh; Nugroho, Prapto; Anand, Awinash; Tomar, Abhishek; Kanaya, Haruichi; Yoshida, Keiji.
In: IEICE Transactions on Electronics, Vol. E96-C, No. 2, 02.2013, p. 262-269.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low phase noise 14-bit digitally controlled CMOS quadrature ring oscillator
AU - Pokharel, Ramesh
AU - Nugroho, Prapto
AU - Anand, Awinash
AU - Tomar, Abhishek
AU - Kanaya, Haruichi
AU - Yoshida, Keiji
PY - 2013/2
Y1 - 2013/2
N2 - High phase noise is a common problem in ring oscillators. Continuous conduction of the transistor in an analog tuning method degrades the phase noise of ring oscillators. In this paper, a digital control tuning which completely switches the transistors on and off, and a 1/f noise reduction technique are employed to reduce the phase noise. A 14-bit control signal is employed to obtain a small frequency step and a wide tuning range. Furthermore, multiphase ring oscillator with a sub-feedback loop topology is used to obtain a stable quadrature outputs with even number of stages and to increase the output frequency. The measured DCO has a frequency tuning range from 554MHz to 2.405 GHz. The power dissipation is 112mW from 1.8V power supply. The phase noise at 4MHz offset and 2.4 GHz center frequency is -134.82 dBc/Hz. The FoM is -169.9 dBc/Hz which is a 6.3 dB improvement over the previous oscillator design.
AB - High phase noise is a common problem in ring oscillators. Continuous conduction of the transistor in an analog tuning method degrades the phase noise of ring oscillators. In this paper, a digital control tuning which completely switches the transistors on and off, and a 1/f noise reduction technique are employed to reduce the phase noise. A 14-bit control signal is employed to obtain a small frequency step and a wide tuning range. Furthermore, multiphase ring oscillator with a sub-feedback loop topology is used to obtain a stable quadrature outputs with even number of stages and to increase the output frequency. The measured DCO has a frequency tuning range from 554MHz to 2.405 GHz. The power dissipation is 112mW from 1.8V power supply. The phase noise at 4MHz offset and 2.4 GHz center frequency is -134.82 dBc/Hz. The FoM is -169.9 dBc/Hz which is a 6.3 dB improvement over the previous oscillator design.
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U2 - 10.1587/transele.E96.C.262
DO - 10.1587/transele.E96.C.262
M3 - Article
AN - SCOPUS:84873626562
VL - E96-C
SP - 262
EP - 269
JO - IEICE Transactions on Electronics
JF - IEICE Transactions on Electronics
SN - 0916-8524
IS - 2
ER -