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设计了符合工业无线传感器网络WIA-PA标准的发射机电路。采用中频转换电路控制模拟中频信号的偏置及幅度以满足混频器的输入范围。采用正交双平衡混频器结构进行上变频,通过在固定电容上串联可调电容,拓宽了混频器的选频范围。后级接可编程功率预放大器,产生差分的功率输出信号,以满足不同传输距离的要求。发射机电路在0.13μmCMOS工艺下进行流片。通过与WIA-PA基带芯片联合调试,测试结果表明,设计的直接上变频发射机芯片的误差矢量幅度(EVM)小于13.5%,镜像抑制达到34dBc,很好地满足了无线传感器网络节点的应用需求。
The transmitter circuit is designed according to WIA-PA standard of industrial wireless sensor network. The intermediate frequency conversion circuit is used to control the bias and amplitude of the analog IF signal to meet the input range of the mixer. Using quadrature double-balanced mixer structure for upconversion, capacitance adjustable capacitor in series on the fixed, broadening the frequency range of the mixer. After the next programmable pre-amplifier power, resulting in differential power output signal to meet the requirements of different transmission distances. Transmitter circuit in 0.13μmCMOS process flow sheet. Through the joint debugging with WIA-PA baseband chip, the test results show that the error vector magnitude (EVM) of the designed direct up-conversion transmitter chip is less than 13.5% and the image rejection is up to 34dBc, which well meets the application requirements of the wireless sensor network node .