Analysis of Current Efficiency for CMOS Class-B LC Oscillators

被引：4
|
作者：
Wang, Zisong [1 ]
Diao, Shengxi [2 ]
He, Lin [1 ]
Jiang, Xicheng [3 ]
Lin, Fujiang [1 ]
机构：
[1] Univ Sci & Technol China, Dept Elect Sci & Technol, Hefei 230027, Anhui, Peoples R China
[2] E China Normal Univ, Sch Informat Sci & Technol, Shanghai Key Lab Multidimens Informat Proc, Shanghai 200241, Peoples R China
[3] Broadcom Corp, Irvine, CA 92617 USA
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS | 2015年 / 62卷 / 05期
关键词：
Amplitude; class-B; class-C; CMOS; current efficiency; LC; oscillator; phase noise; voltage efficiency; ROBUST START-UP; PHASE NOISE; PERFORMANCE; VCO;
D O I：
10.1109/TCSI.2015.2411792
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：
This paper focuses on the study of current efficiency in CMOS class-B LC oscillators. Exact expressions for current efficiency have been derived for the class-B oscillator. Theoretically, to achieve optimal figure-of-merit (FoM), the current efficiency in class-B oscillators is between 0.60 and 0.85, which revises the common assumption that current efficiency in all class-B oscillators is equal to 2/pi. According to the theoretical analysis, the character of the tail capacitance and the boundary between current-limited regime and voltage-limited regime are discussed as well. A closed-form FoM expression is given with comparisons among different oscillators (including the traditional class-B, the AC-coupled class-B and the class-C), which show that the current efficiency of the two kinds of class-B oscillators is identical and the current efficiency of class-C oscillators is between 0.85 and 1. It is also shown that the main difference between the performances of these oscillators lies in voltage efficiency rather than current efficiency.
引用
收藏
页码：1345 / 1352
页数：8
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