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摘要
A CMOS ultra-high frequency-band RF transceiver based on 8-phase harmonic rejection mixer (HRM) architecture with an integrated fractional-N PLL synthesizer is presented for television white space applications. A divide-by-2 and a phase interpolator (PI) circuit are used to generate the 8-phase LO signals for the HRM. The synthesizer output frequency is two times higher than the desired band frequency. The PI is tunable to allow 7-bit calibration of 45. and 135. LO phases. A systematic 2-D calibration scheme that is applicable to both the receiver and transmitter is described. It is demonstrated that only 45. and 135. LO phase calibration is sufficient to minimize the third and fifth harmonic components. Implemented in 0.18-mu m CMOS, the RF transceiver covers 470-806 MHz, achieving the third and fifth harmonic suppressions below -48 and -56 dBc at the receiver, and the harmonic emission below -51 dBc at the transmitter.
- 出版日期2017-11
