A switched-capacitor programmable-gain amplifier for high-definition video analog front-ends
A switched-capacitor programmable-gain amplifier for high-definition video analog front-ends
复制标题
用于高清视频模拟前端的开关电容可编程增益放大器
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Jun Cheng
中科院分区：
文献类型：
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作者：
Hong Zhang;Xue Li;Yongliang Chen;Jun Cheng
提出了一种用于高清视频模拟前端的开关电容可编程增益放大器（PGA）。PGA还充当ADC的采样和保持器，以降低整个AFE的功耗和芯片面积。9位增益和失调控制DAC嵌入PGA的开关电容网络。仿真结果表明，在1.8V电源电压下，PGA的增益范围为0.9 ~ 2.4V/V，失调控制范围为-230 ~230mV，功耗为10.1mA。采用TSMC0.18 μm工艺实现了基于PGA的AFE。测试结果表明，该AFE能够处理1080 pYPbPr的HDTV信号和UXGA（1600× 1200@75Hz）的计算机视频信号。
A switched-capacitor programmable gain amplifier (PGA) for high-definition video analog front-ends (AFEs) is presented. The PGA also acts as the sample and holder of the ADC to reduce the power consumption and chip area of the whole AFE. The 9-bit gain and offset control DACs are embedded into the switched capacitor networks of the PGA. Simulated results show that the PGA achieves a gain range of 0.9 to 2.4V/V, and an offset control range of -230 to 230mV while consuming 10.1mA from a 1.8V power supply. An AFE based on the proposed PGA is fabricated in TSMC 0.18μm process. Measurement results show that the AFE achieves the capability to process variant HDTV signals up to 1080p YPbPr and computer video signals up to UXGA (1600×1200 @75Hz).