| 宽带CMOS可变增益放大器的设计 |
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| 引用本文： | 郭峰,李智群,陈东东,李海松,王志功. 宽带CMOS可变增益放大器的设计[J]. 半导体学报, 2007, 28(12): 1967-1971 |
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| 作者姓名： | 郭峰 李智群 陈东东 李海松 王志功 |
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| 作者单位： | 东南大学射频与光电集成电路研究所,南京,210096 |
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| 基金项目： | 东南大学射光所与安宇科技合作项目 |
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| 摘 要： | 采用TSMC 0.18μm RF CMOS工艺设计实现了一种对数增益线性控制型的宽带可变增益放大器.电路采用两级结构,前级采用电压并联负反馈的Cascode结构以实现良好的输入匹配和噪声性能;后级采用信号相加式电路实现增益连续可调.同时本文设计了一种新型指数控制电压转换电路,解决了射频CMOS电路中,由于漏源电流与栅源电压通常不为指数关系而造成放大器对数增益与控制电压不成线性关系的难题,实现了可变增益放大器的对数增益随控制电压呈线性变化.芯片测试结果表明,电路在1.8V电源电压下,电流为9mA,3dB带宽为430～2330MHz.增益调节范围为-3.3～9.5dB,最大增益下噪声系数为6.2dB,最小增益下输入1dB压缩点为-9dBm.
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| 关 键 词： | 可变增益放大器 CMOS 宽带 指数线性控制 |
| 收稿时间： | 2015-08-18 |
| 修稿时间： | 2007-07-23 |
Design of a Wideband CMOS Variable Gain Amplifier |
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| Guo Feng, Li Zhiqun, Chen Dongdong, Li Haisong, Wang Zhigong. Design of a Wideband CMOS Variable Gain Amplifier[J]. Journal of Semiconductors, 2007, In Press. Guo F, Li Z Q, Chen D D, Li H S, Wang Z G. Design of a Wideband CMOS Variable Gain Amplifier[J]. Chin. J. Semicond., 2007, 28(12): 1967.Export: BibTex EndNote |
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| Authors: | Guo Feng Li Zhiqun Chen Dongdong Li Haisong Wang Zhigong |
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| Affiliation: | Institute of RF- & OE-ICs,Southeast University,Nanjing 210096,China;Institute of RF- & OE-ICs,Southeast University,Nanjing 210096,China;Institute of RF- & OE-ICs,Southeast University,Nanjing 210096,China;Institute of RF- & OE-ICs,Southeast University,Nanjing 210096,China;Institute of RF- & OE-ICs,Southeast University,Nanjing 210096,China |
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| Abstract: | This paper presents the design of a variable gain amplifier with wideband and linear-in-dB gain control based on a TSMC 0.18μm RF CMOS process.The circuit of the amplifier consists of two gain stages.The first stage is a cascode amplifier with voltage-shunt negative feedback for good input impedance matching and noise figure performance.The second stage adopts the signal-summing structure to achieve gain control.A new exponential function circuit is added to solve the problem that the gain of amplifier and the control voltage is not a linear relationship,which caused by the non-exponential relationship between drain-source current and gate-source voltage,making the gain become linear in dB along with the control voltage.Measurement results show that the amplifier consumes 9mA at 1.8V.The 3dB bandwidth is 430~2330MHz.The circuit has a controllable gain range of -3.3~9.5dB.The noise figure is 6.2dB at maximum gain,and the input P1dB at minimum gain is -9dBm. |
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| Keywords: | variable gain amplifier CMOS wideband dB-linear |
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