论文部分内容阅读
对T型衰减器的插入损耗和衰减性能进行了理论分析,在此基础上设计了一个用于跳时超宽带(TH-UWB)通信的载波频率为4GHz的通断键控(OOK)调制器.该调制器的核心是一个T型RFCMOS衰减器,其电路拓扑结构包括3个主要部分:振荡频率为4GHz的振荡器、由射频CMOS晶体管构成的T型衰减器和带有L型结构的输出阻抗匹配网络.该调制器由一个脉位调制(PPM)信号控制,使已调信号的包络随控制信号的幅度而变化,以实现调制功能.除此之外,输出匹配网络将调制器的输出阻抗匹配到50Ω负载.调制器采用0.18μm射频CMOS工艺进行设计并仿真,其芯片经过测试,在1.8V电源和50Ω负载下有65mV的输出幅度,输出端回波损耗(S11)小于-10dB,功耗为12.3mW,芯片尺寸为0.7mm×0.8mm.
Based on the theoretical analysis of the insertion loss and attenuation performance of the T-type attenuator, an on-off keying (OOK) modulator with 4GHz carrier frequency for TH-UWB communication is designed At the heart of the modulator is a T-RFCMOS attenuator with a circuit topology consisting of three main parts: an oscillator with an oscillation frequency of 4 GHz, a T-type attenuator consisting of a radio-frequency CMOS transistor, and an output with an L-shaped structure Impedance matching network. The modulator is controlled by a pulse-width modulated (PPM) signal that varies the envelope of the modulated signal as a function of the amplitude of the control signal to achieve modulation. In addition, the output matching network couples the modulator’s The output impedance is matched to a 50Ω load.The modulator is designed and emulated with a 0.18μm RF CMOS process and tested on a chip with a 65mV output at 1.8V and 50Ω and a return loss (S11) of less than -10dB , Power consumption is 12.3mW, chip size is 0.7mm × 0.8mm.