INT Research: Switching Mode Power Amplifier for Fully Digital RF Transmitter at 3.6 GHz in 22 nm FD-SOI CMOS

June 19, 2023 / INT

INT presents a Switching Mode Power Amplifier for Fully Digital RF Transmitter at 3.6 GHz in 22 nm FD-SOI CMOS at 18th International Conference on PhD Research in Microelectronics and Electronics (PRIME 2023).
[Picture: http://prime-conference.org/]

Switching Mode Power Amplifier for Fully Digital RF Transmitter at 3.6 GHz in 22 nm FD-SOI CMOS

Manuel Wittlinger, Markus Grözing and Manfred Berroth

Abstract — Post-layout simulation results of a current mode switching mode power amplifier (CM-SMPA) in 22 nm FD-SOI CMOS for a fully digital RF transmitter with a peak output power of 23.51 dBm (224.4 mW) at 3.6 GHz are presented. The CM-SMPA is driven by a pulse-width (PW) and pulse-position (PP) modulated signal for amplitude and phase control. To increase the amplitude dynamic range, the conductance (G) of the switches is also modulated. For a 64-QAM signal with 112.5 MBd, an error vector magnitude (EVM) of -32.50 dB with a maximum adjacent channel leakage ratio (ACLR) of -40.81 dB in the neighbor channel is achieved. The average total efficiency and drain efficiency are 24.93 % and 32.12 % respectively. The large signal bandwidth potential of this transmitter concept is shown by a simulation of a 450 MBd 64-QAM with a channel bandwidth of 675 MHz.

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