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为满足无线体域网接收机超低功耗的要求,设计了一种3~5GHz超低功耗非相关脉冲超宽带接收机射频前端电路,包括低噪声放大器(LNA)、有源巴伦和平方器。为了降低功耗,采用电流复用技术设计LNA和有源巴伦;同时设计了一种工作在亚阈值区域的全差分平方器,将基于吉尔伯特乘法器的平方器的功耗从mW级降低到μW级。此外,采用电容交叉耦合技术,提高了平方器的转换增益。基于SMIC 0.13μm CMOS工艺的仿真结果显示,接收机射频前端在开关键控调制1 Mb/s脉冲速率下,其灵敏度达-81dBm,能量效率达0.42nJ/pulse。
In order to meet the requirement of ultra-low power consumption of the wireless body area network receiver, a 3 ~ 5GHz ultra-low power non-correlated pulse ultra-wideband receiver RF front-end circuit is designed, including low noise amplifier (LNA), active balun Squares. In order to reduce the power consumption, the LNA and active balun are designed by using the current multiplexing technology. Meanwhile, a fully differential squarer operating in the sub-threshold region is designed. The power of the square-based Gilbert multiplier is reduced from mW level Reduced to μW level. In addition, the use of capacitive cross-coupling technology to improve the conversion gain square. The simulation results based on the SMIC 0.13μm CMOS technology show that the receiver’s RF front-end has a sensitivity of -81dBm and an energy efficiency of 0.42nJ / pulse at 1 Mb / s pulse rate.