High phase accuracy and low amplitude mismatch quadrature LO driver

作者：Han Shuguang^*; Chi Baoyong; Wang Zhihua

来源：Pan Tao Ti Hsueh Pao/chinese Journal of Semiconductors, 2005, 26(7): 1295-1300.

• Amplitude calibration
• CMOS
• LO driver
• Phase calibration
• Poly phase filter
• Quadrature

A 1.1-1.2 GHz CMOS high phase accuracy, low amplitude mismatch quadrature LO driver is presented, which consists of a high frequency amplifier, an integrated poly phase filter, and an I/Q phase and magnitude calibration circuit (PMCC). The proposed PMCC uses a feed-forward calibration technique. It improves the phase accuracy and reduces the amplitude mismatch with low power consumption. Simulation results show that phase error with PMCC is reduced to about one half and the amplitude mismatch is reduced to about one tenth, when compared to the LO driver without PMCC. Moreover, the calibration circuit also functions as a buffer to drive mixers, thus no additional buffer is needed in this design. The LO driver is implemented in a TSMC 0.25 μm CMOS process. Experimental results show that the LO driver achieves high quadrature accuracy (<2°) and low amplitude mismatch (<0.1%). It has about 5.25 dB gain and dissipates 6 mA from the 2.5 V power supply. The size of the die area is only 1.0 mm × 1.0 mm.

• 出版日期2005
• 单位清华大学