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引用次数: 1
摘要
本文介绍了一种用于DVB-C接收机的CMOS中频VGA电路。VGA核心基于电流转向结构，采用了多种优化方法来提高其线性度和稳定性。设计了一种新型的CMOS指数电压发生器，实现了其在db中的线性控制特性。基于0.25 μ m CMOS工艺的仿真结果表明，VGA可提供40dB增益控制范围，IIP3最小增益设置为17.2 dBm，最小NF为7.8 dB。在3.3V电源电压下，整体电流损耗小于23ma
A 40dB, 100MHz CMOS IF variable gain amplifier for DVB-C receivers
A CMOS IF VGA used for DVB-C receivers is presented in this paper. The VGA core is based on current-steering structure, and several optimization methods are used to improve the linearity and stability. A novel CMOS exponential voltage generator is designed to realize the linear-in-dB control characteristic. The simulation results based on 0.25 mum CMOS process indicate that the VGA can provide 40dB gain control range, the IIP3 at the minimum gain setting 17.2 dBm, and the minimum NF 7.8 dB. The overall current dissipation is less than 23 mA at 3.3V supply voltage
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