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All-digital out-phasing modulator for a software-defined transmitter

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3 Author(s)
Mohammad E. Heidari ; Department of Electrical Engineering, University of California, Los Angeles, USA ; Minjae Lee ; Asad A. Abidi

An all-digital out-phasing transmitter suitable for software-defined radio (SDR) is presented. It uses a phase-locked loop followed by two digital phase rotator blocks embedded in two delay-locked loops. The chip is fabricated in a 90 nm CMOS process with total active area of 3 mm2, and tested for GSM and WCDMA standards. The whole transmitter excluding phase-to-digital converter (PDC) consumes 55 mA, and current consumption of the PDC is 70 mA.

Published in:

2008 IEEE Symposium on VLSI Circuits

Date of Conference:

18-20 June 2008