论文部分内容阅读
设计了一种相位精确可调的四路正交信号发生器,由相位精确调节器和二分频器构成。相位精确调节器通过控制尾电流源的导通产生可编程的电流,再使该电流转换成偏置电压叠加在时钟信号上,以此来调节二分频器产生的四路信号的相位差,使其相位精确互差90°。电路采用SMIC 0.13μm CMOS工艺进行仿真验证。结果表明,在电源电压为1.2V,偏置电流为7.2μA,且电平信号的选通位数n=6时,产生的四路正交信号的误差精度可达±0.1°,调相范围达±3.6°。
A quadrature signal generator with accurate phase modulation is designed, which consists of a phase-accurate regulator and a two-frequency divider. The phase accurate regulator generates a programmable current by controlling the conduction of the tail current source and then converts the current into a bias voltage and superimposes the clock signal so as to adjust the phase difference of the four signals generated by the two frequency dividers, So that the exact phase difference of 90 ° each phase. The circuit is simulated using the SMIC 0.13μm CMOS process. The results show that the error of the quadrature quadrature signal can reach ± 0.1 ° with the supply voltage of 1.2V, the bias current of 7.2μA, and the strobe bit of the level signal n = 6. The phase modulation range Up to ± 3.6 °.