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A Novel Approach for Mitigation of RF Oscillator Pulling in a Polar Transmitter

A Novel Approach for Mitigation of RF Oscillator Pulling in a Polar Transmitter,10.1109/JSSC.2010.2096110,IEEE Journal of Solid-state Circuits,Imran B

A Novel Approach for Mitigation of RF Oscillator Pulling in a Polar Transmitter   (Citations: 1)
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A novel technique for mitigation of self interference in a highly integrated SoC transmitter is presented. The interfer- ence originates from the internal power amplifier (i.e., aggressor) that leadsto injectionpullingofthelocalRFoscillator(i.e.,victim). The characteristic of injection pulling was found to be dependent on the AM signal applied to the power amplifier. A hypothesis de- scribing the mechanism of injection pulling of the local oscillator is presented. A mathematical model is developed to study the char- acteristics of this self interference verified then by measurements. Based on this model, a digitally controlled delay circuit is proposed and implemented in a digital polar GSM/EDGE transmitter that makes the system less susceptible to injection pulling through au- tomatic phase adjustment between the aggressor and the victim. Compliant EVM and spectrum performance is measured on SoC fabricated in 65-nm CMOS showing the effectiveness of the pro- posed solution. Index Terms—All-digital PLL (ADPLL), amplitude control word (ACW), digitally controlled delay (DCD), digitally controlled oscillator (DCO), digitally controlled power amplifier (DPA), Dig- ital RF Processor (DRP), Digital-to-frequency converter (DFC), digital-to-RF amplitude converter (DRAC), frequency command word (FCW), interference mitigation, phase error (PHE or ), self-interference, system-on-chip (SoC), time-to-digital converter (TDC).
Journal: IEEE Journal of Solid-state Circuits - IEEE J SOLID-STATE CIRCUITS , vol. 46, no. 2, pp. 403-415, 2011
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