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A Time-Domain Resolution Improvement of an RF-DAC

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3 Author(s)
Min Park ; Maxim Integrated Products, Sunnyvale, CA, USA ; Perrott, M.H. ; Staszewski, R.B.

We propose a time-domain technique that significantly improves resolution of an RF digital-to-analog converter (RF-DAC). As an alternative to resorting to various resolution improvement attempts in the amplitude domain or through quantization noise shaping, pulsewidth modulation (PWM) of a single least significant bit device is employed with fine timing accuracy easily afforded by advanced CMOS technology. The technique is examined in the context of a commercial Enhanced Data rates for GSM Evolution (EDGE) polar transmitter realized in 65-nm CMOS, which employs an amplitude modulator with basic 10-bit amplitude resolution limited by the RF-DAC switching device mismatches. Behavioral simulations include realistic device mismatches and show worst-case resolution improvement of 2.2 bits assuming 20-ps worst-case time granularity of the PWM signal controls.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:57 ,  Issue: 7 )