A Dual-Band Millimeter-Wave Direct-Conversion Transmitter With Quadrature Error Correction

作者：Wu Po Yi^*; Gupta Arpit K; Buckwalter James F

来源：IEEE Transactions on Microwave Theory and Techniques, 2014, 62(12): 3118-3130.

DOI：10.1109/TMTT.2014.2362123

• BiCMOS
• direct-conversion transmitter
• dual-band
• error vector magnitude (EVM)
• in-phase and quadrature (I/Q) modulator
• millimeter-wave (mm-wave)
• quadrature error correction

The analysis and implementation of a dual-band direct-conversion millimeter-wave transmitter is presented. The proposed dual-band modulator uses high-impedance loads at two frequencies for the local oscillator driving amplifiers and power amplifier (PA) pre-amplifiers. To correct the amplitude and phase imbalance of the in-phase and quadrature channels at and W-bands, the paper suggests a digitally controlled quadrature error correction stage to finely calibrate these errors and lower the error vector magnitude (EVM) without increasing the baseband digital-to-analog converter resolution. The transmitter is fabricated in 0.12-mu m silicon-germanium BiCMOS process and occupies an area of 5.5 mm(2). At 45-GHz carrier frequency, error correction improves the sideband suppression ratio (SSR) by 10 dB at 2.4-MHz IF frequency. The EVM is lowered from 3.21% to 2.38% for a 64-QAM constellation at a 2.4-Ms/s symbol rate. At 94-GHz carrier frequency, the SSR is improved from 24 to 41 dBc at 2.4-MHz IF frequency, and the EVM is lowered by more than 1% for a 16-QAM constellation at 3-Ms/s symbol rate. A dual-band PA breakout measurement indicates the peak power-added efficiency of 15% with 14-dBm maximum saturated power (Psat) at 43 GHz and 9-dBm Psat at 82 GHz is achieved.

• 出版日期2014-12