Mixed Cartesian feedback for Zero-IF WCDMA transmitter

作者：Delaunay N^*; Abid M; Le Gal B; Dallet D; Rebai C; Deltimple N; Belot D; Kerherve E

来源：Analog Integrated Circuits and Signal Processing, 2012, 73(3): 909-917.

DOI：10.1007/s10470-012-9937-1

• Cartesian feedback loop
• WCDMA transmitter
• Architecture matching algorithm
• CMOS 65 nm technology

In this paper, a new adaptive power amplifier (PA) linearization technique is presented. The idea is to consider a classic WCDMA zero-intermediate frequency (Zero-IF) transmitter with a modified Cartesian feedback (CFB) loop. The new transmitter architecture consists of an analog stage including forward I/Q modulator and feedback I/Q demodulator, and a digital stage adjusting the phase rotation around the loop. The whole system consumes 500 and 2.94 mW, respectively, for the analog and the digital part. System level simulation gave a maximum improvement of 35 dBc at 5 MHz from the carrier for the W-CDMA signal.

• 出版日期2012-12