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In cellular applications, open-loop small-signal polar transmitters offer several advantages such as low power consumption and small silicon area. However, due to their complexity, circuit imperfections can severely affect performance, potentially rendering them impractical to meet the challenging cellular transmitter requirements. In this paper a detailed analysis of the direct-modulated and small-signal...
An RFIC within a direct open-loop polar multimode transmitter that supports UMTS, GSM, and EDGE is shown in 0.18 mum CMOS. Design details, and chipset system application are explained. The chip architecture applies phase accurate FLL two-point modulator with SigmaDelta feedback control for AM-PM corrected wideband phase modulation to an LC VCO, and AM-AM corrected envelope drive of multi-stage saturated...
This paper describes a VCO gain calibration technique for the two-point modulation scheme using Delta-Sigma frequency synthesizer. The proposed technique enables PLL-based phase modulator to have wide bandwidth with good signal quality. A fully integrated GSM/EDGE polar modulated transmitter, implemented in a 0.13 mum CMOS process, is presented to show the feasibility of this calibration technique...
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