A magnetically tuned quadrature oscillator

被引:46
作者
Cusmai, Giuseppe
Repossi, Matteo
Albasini, Guido
Mazzanti, Andrea
Svelto, Francesco
机构
[1] Univ Pavia, Lab Microelett, I-27100 Pavia, Italy
[2] STMicroelect, I-27100 Pavia, Italy
[3] Univ Modena, I-41100 Modena, Italy
关键词
CMOS radio-frequency integrated circuits (RFICs); frequency tuning; integrated transformers; local oscillators; quadrature voltage-controlled oscillators (VCOs);
D O I
10.1109/JSSC.2007.908727
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Continuous frequency tuning by control of the magnetic field of a transformer-capacitor tank, in a selective oscillator, is explored in this work. A quadrature generator is built connecting two identical transformer-capacitor oscillator cells in a feedback loop. The topology itself assures the currents in the transformer windings are aligned in phase, while their relative amplitude determines, via magnetic coupling, oscillators' tank reactance, i.e., oscillation frequency. This paper introduces the idea, analyzes oscillation amplitude, frequency tuning band, phase noise, and phase accuracy, and discusses design and experiments. Prototypes, realized in 65 nm CMOS, employing MOS varactors to further extend operation bandwidth, show the following performances: 3.2 GHz and 7.3 GHz minimum and maximum oscillation frequency, respectively. Phase noise figure of merit of 176.5 dB at 3.2 GHz and 170.5 dB at 6.4 GHz is observed, with 24 mW maximum power consumption and 1.5 degrees maximum deviation from quadrature.
引用
收藏
页码:2870 / 2877
页数:8
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