A high phase accuracy, low amplitude mismatch quadrature LO driver

A 1.25∼1.35GHz CMOS high phase accuracy, low amplitude mismatch quadrature LO driver is presented, it consists of a high frequency amplifier, an integrated poly phase filter and an I/Q phase and magnitude calibration circuit (PMCC). PMCC is proposed to improve the phase accuracy and reduce the amplitude mismatch. The simulation shows the phase error with PMCC is reduced to one half and the amplitude mismatch is reduced to one quarter compared to the LO driver without PMCC. Moreover, the calibration circuit is also the buffer to drive mixers, so in this design, the additional buffer is not needed. The LO driver is implemented in 0.25μm CMOS process.