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提出了一种工作在1.1～1.2GHz的相位准确度高、幅值失配度低的正交LO驱动电路.它主要由高频放大器、二阶的无源多项滤波器、相位和幅度校准电路(PMCC)组成.PMCC是一种利用前馈技术实现的低功耗电路,大大提高了正交信号的正交性,降低了相邻支路信号的幅值误差.仿真结果表明,经过PMCC校准后,输出正交信号的相位误差可以降低大约一半,而幅度误差可以降低到原来的十分之一.PMCC可直接驱动混频器,无需额外的驱动电路.本设计已经用TSMC0.25μmCMOS工艺实现并进行了验证.测试结果表明本文提出的校准电路能够获得高正交性(<2°)和低幅值误差(<0.1%)的正交信号,测试的最大功率增益为5.25dB,在2.5V的电源电压下,消耗的电流约为6mA,芯片面积为1.0mm×1.0mm.
A quadrature LO drive circuit with high phase accuracy and low amplitude mismatch in 1.1 ~ 1.2GHz is proposed.It mainly consists of a high frequency amplifier, a second order passive multinomial filter, phase and amplitude calibration (PMCC) .PMCC is a low-power circuit using feedforward technology, which greatly improves the orthogonality of orthogonal signals and reduces the amplitude error of the adjacent branch signals.The simulation results show that after PMCC After calibration, the output quadrature signal phase error can be reduced by about half, and the amplitude error can be reduced to one-tenth of the original. PMCC can directly drive the mixer without additional driver circuit. The design has been used TSMC0.25μmCMOS process The test results show that the proposed calibration circuit can obtain orthogonal signals with high orthogonality (<2 °) and low amplitude errors (<0.1%), and the maximum power gain of the test is 5.25dB. 2.5V supply voltage, the current consumption of about 6mA, the chip area of 1.0mm × 1.0mm.