Abstract
An energy efficient digital polar transmitter (TX) based on 1.5bit Delta-Sigma modulator (DSM) and fractional-N injection-locked phase-locked loop (IL-PLL) is proposed. In the proposed TX, redundant charge and discharge of turnedoff capacitors in the conventional switched-capacitor power amplifiers (SCPAs) are avoided, which drastically improves the efficiency at power back-off. In the PLL, spur-mitigation technique is proposed to reduce the frequency mismatch between the oscillator and the reference. The transmitter, implemented in 65nm CMOS, achieves a PAE of 29% at an EVM of -25.1dB, and a system efficiency of 23.8%.
Cite
CITATION STYLE
Zhang, Y., Liu, B., Gu, X., Wang, C., Shirane, A., & Okada, K. (2021). A DSM-based Polar Transmitter with 23.8% System Efficiency. In Proceedings of the Asia and South Pacific Design Automation Conference, ASP-DAC (pp. 291–296). Institute of Electrical and Electronics Engineers Inc. https://doi.org/10.1145/3394885.3431653
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