| 摘要: |
| 基于65 nm 互补金属氧化物半导体(Complementary Metal Oxide Semiconductor,CMOS)工艺设计了一款应用于Ka波段多通道收发前端的温补衰减器，以补偿环境温度变化引起的系统链路增益漂移。该温补衰减器无需传统的片上温度传感器，能够有效降低系统实现复杂度的同时减小芯片面积。仅利用了收发系统芯片中内置的带隙基准电流獻㏄TAT，该电流大小具有正比于绝对温度（Proportional to Absolute Temperature,PTAT）的特性。通过将此电流转换为特定控制电压，使得最终衰减幅度与温度呈高度线性关系。为了最大限度地减少由工艺、电压、温度（Process,Voltage,and Temperature,PVT）引起的补偿误差，该转换部分还集成了用于PVT波动校正的调谐电路。此外，为了保证全温状态下的宽带端口匹配特性，该衰减器构建了一个新型自匹配反馈环路。通过引入运算放大器产生反馈电压至衰减单元，使端口阻抗自动匹配到50 Ω，实现了直流到40 GHz频率范围内小于-15 dB的低回波损耗。经仿真验证，该衰减器在Ka波段-55 ℃~85 ℃温度范围内可实现8 dB的增益补偿，衰减量随温度变化非线性小于6%，芯片尺寸为130 μm×230 μm。 |
| 关键词: 多通道收发前端 Ka波段 硅基衰减器 PVT波动校正 自匹配反馈环路 |
| DOI：10.20079/j.issn.1001-893x.240701001 |
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| 基金项目: |
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| A Ka-band Silicon-based High-linearity Attenuator for Temperature Compensation with PVT Fluctuation Calibration |
| LIU Zhiqing,SUN Jianpeng |
| (1.Southwest China Institute of Electronic Technology,Chengdu 610036,China;2.School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China) |
| Abstract: |
| To compensate the gain drift of system link caused by ambient temperature change,a temperature-controlled attenuator applied in Ka-band multi-channel TR front-end is designed in 65 nm complementary metal oxide semiconductor(CMOS) process.The attenuator requires no traditional on-chip temperature sensor,resulting in a reduced system complexity and chip area.It just utilizes a current 獻㏄TAT generated by a bandgap,which is built into a TR system chip and has the characteristic of being proportional to absolute temperature(PTAT).By converting this current into a specific control voltage range,the attenuation amplitude is highly linear with temperature.To minimize compensation errors caused by process,voltage,and temperature(PVT),this conversion component also integrates a tuning circuit for PVT fluctuation calibration.Furthermore,to maintain the broadband radio frequency port matching characteristics at full temperature, |
| Key words: multi-channel TR front-end Ka-band silicon-based attenuator PVT fluctuation calibration self-matching feedback loop |
