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A 900MHz GFSK and 16-FSK TX Achieving Up to 63.9% TX Efficiency and 76.2% PA Efficiency via a DC-DC-Powered Class-D VCO and a Class-E PA | IEEE Journals & Magazine | IEEE Xplore

A 900MHz GFSK and 16-FSK TX Achieving Up to 63.9% TX Efficiency and 76.2% PA Efficiency via a DC-DC-Powered Class-D VCO and a Class-E PA


Abstract:

This brief presents a highly efficient transmitter capable of radiating GFSK and 16-FSK modulated signals in the 900MHz ISM band. Multiple low power techniques are exploi...Show More

Abstract:

This brief presents a highly efficient transmitter capable of radiating GFSK and 16-FSK modulated signals in the 900MHz ISM band. Multiple low power techniques are exploited such as a class-D VCO and a class-E single stage PA to enhance the TX efficiency. Using an on-chip DC-DC converter, the VCO can operate with down to a 250mV supply and generate 750mV signals to the input of the PA. A phased locked loop (PLL) is implemented for rapid calibration of the LO frequency and is locked to a 2MHz crystal, which also provides the clock for the DC-DC converter. The fabricated integrated circuit occupies 1mm2 area in 65nm LP CMOS, achieves a peak 76.2% PA efficiency and 63.9% TX efficiency, while being capable of delivering up to 3dBm to a 50\Omega antenna.
Published in: IEEE Transactions on Circuits and Systems II: Express Briefs ( Volume: 69, Issue: 9, September 2022)
Page(s): 3739 - 3743
Date of Publication: 27 April 2022

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