一种1GHz, 56.7dB的线性in db CMOS宽带可变增益放大器

2018 10th International Conference on Communications, Circuits and Systems (ICCCAS) Pub Date : 2018-12-01 DOI:10.1109/ICCCAS.2018.8769272

Zhaofeng Zhang, Yingchun Yuan, Jiehai Xu, C. Zhang

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引用次数: 3

摘要

提出并设计了一种采用0.18μm CMOS工艺的4级宽带可变增益放大器(VGA)，该放大器具有线性- db增益控制特性。改进的Cherry-Hooper放大器具有宽带宽和大增益调谐范围的特点。输入交流耦合和双反馈直流偏置消除器相结合来抑制不希望的直流偏置。伪指数函数电路被添加到将线性幅度VGA转换成线性db的VGA。仿真结果表明，该VGA接口的3db带宽为1GHz, db内线性增益调谐范围为56.7dB， -6.7dB ~ 50dB, IP1-dB范围为-60dB ~ -17dB。单电源电压为1.8V，功耗为7.7mW，硅面积为100μm × 134μm。

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A 1GHz, 56.7dB Linear-in-dB CMOS Wideband Variable Gain Amplifier

A four-stage wideband Variable Gain Amplifier (VGA) with linear-in-dB gain control characteristic is presented and designed in 0.18μm CMOS Technology. The modified Cherry-Hooper amplifier is employed for wide bandwidth and large gain tuning range. The input AC-coupling and the dual feedback DC-offset canceller are combined to suppress the undesired DC offsets. The pseudo-exponential function circuit is added to transform the linear-in-magnitude VGA into the linear-in-dB one. Simulation results show the presented VGA achieves 3-dB bandwidth of 1GHz, linear-in-dB gain tuning range of 56.7dB from -6.7dB to 50dB, and IP1-dB ranging from -60dB to -17dB. Besides, it consumes 7.7mW from a single supply voltage of 1.8V and occupies a silicon area of 100μm × 134μm.

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2018 10th International Conference on Communications, Circuits and Systems (ICCCAS)

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