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All-Digital Outphasing Modulator for a Software-Defined Transmitter

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3 Author(s)
Heidari, M.E. ; Electr. Eng. Dept., Univ. of California, Los Angeles, CA ; Minjae Lee ; Abidi, A.A.

An all-digital outphasing modulator to be used in a software-defined radio (SDR) transmitter is presented. A digitally-controlled oscillator (DCO) followed by two digital phase rotators (DPR) are the main building blocks. The DCO and DPRs are enclosed, respectively, by a phase-locked loop and two delay-locked loop. All functions, including filtering and calibration are performed in a digital signal processor (DSP). The chip was fabricated in a 90 nm CMOS process and tested for GSM and WCDMA. The total active area of the chip is 3 mm2 . Semi-analog blocks (DCO core, DPR core and their buffers) and digital processor consume 30 mA and 25 mA, respectively. Current consumption of the phase-to-digital converter is 70 mA, which can be reduced to 30% by gating off the circuit during idle times.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:44 ,  Issue: 4 )
RFIC Virtual Journal, IEEE