Analysis and characterization of mismatches in outphasing transmitter

The effect of imbalances in the quadrature modulators and the two RF paths of an outphasing transmitter are studied in this paper. A matlab model describing all the mismatches is used to investigate the effects on error vector magnitude (EVM) and adjacent channel interference. A test vector based method is used to measure and therefore compensate mismatch. This is applied in a 60 GHz outphasing transmitter in 40nm CMOS and measured mismatch is minimized further by using the compensation scheme. This resulted in improvement in output power and efficiency.

[1]  Patrick Reynaert,et al.  A 60GHz outphasing transmitter in 40nm CMOS with 15.6dBm output power , 2012, 2012 IEEE International Solid-State Circuits Conference.

[2]  H. Chireix.  High Power Outphasing Modulation , 1935, Proceedings of the Institute of Radio Engineers.

[3]  John R. Long,et al.  A 60-GHz Band 2$\,\times\,$2 Phased-Array Transmitter in 65-nm CMOS , 2010, IEEE Journal of Solid-State Circuits.

[4]  Atila Alvandpour,et al.  Phase Predistortion of a Class-D Outphasing RF Amplifier in 90 nm CMOS , 2011, IEEE Transactions on Circuits and Systems II: Express Briefs.

[5]  Kyutae Lim,et al.  Mismatch Detection and Compensation Method for the LINC System Using a Closed-Form Expression , 2008, IEEE Transactions on Microwave Theory and Techniques.

[6]  B. Razavi,et al.  A New Transceiver Architecture for the 60-GHz Band , 2009, IEEE Journal of Solid-State Circuits.

[7]  R. Kaunisto,et al.  A 2.14-GHz Chireix outphasing transmitter , 2005, IEEE Transactions on Microwave Theory and Techniques.

[8]  Lawrence E. Larson,et al.  Gain/phase imbalance-minimization techniques for LINC transmitters , 2001 .

[9]  John R. Long,et al.  A 60GHz-band 2×2 phased-array transmitter in 65nm CMOS , 2010, 2010 IEEE International Solid-State Circuits Conference - (ISSCC).

[10]  Ockgoo Lee,et al.  An Amplitude and Phase Mismatches Calibration Technique for the LINC Transmitter With Unbalanced Phase Control , 2011, IEEE Transactions on Vehicular Technology.