Efficiency and Linearity of Digital Class-C like Transmitters

Conference paper (2021)

Authors

D.P.N. Mul Electronics - EEMCS
R.J. Bootsman Electronics - EEMCS
Q. Bruinsma Teaching & Learning Services
Y. Shen Ampleon Netherlands, Electronics - EEMCS
Sebastian Krause Fraunhofer Institute for Applied Solid State Physics (IAF)
Rudiger Quay Fraunhofer Institute for Applied Solid State Physics (IAF)
M.J. Pelk Electronics - EEMCS
S.M. Alavi Electronics - EEMCS
L.C.N. de Vreede Electronics - EEMCS
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Research Group
Electronics (EEMCS) (TU Delft)
Efficiency Linearity LDMOS Digital power amplifier Digital transmitter RFDAC Polar transmitter Class-C CMOS RFIC
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Published Date

2021

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronics

Abstract

An energy-efficient, intrinsically linear, digital class-C like operation-mode is investigated for use in high-power digital transmitters (DTXs), which target next generation mMIMO base stations that offer lower costs, higher integration, and improved system efficiency. The proposed operation utilizes class-B/C output matching in combination with duty-cycle reduction and current-mode operation of a segmented output stage. Its performance in terms of efficiency, output power, and linearity is benchmarked with analog class-B/C operation. The proposed digital class-C like operation has been experimentally verified using a fully-digital, dual TX line-up with VT-shifted segmented LDMOS output stages. All output stage segments are individually controlled by high-speed digital drivers implemented in 40 nm CMOS technology. The realized prototype provides 25.9 W (CW) output power with 75.7 % drain and 72.9 % system efficiencies, at 930 MHz and at 28 V drain supply.

Files

09338122.pdf
(.pdf | 0.673 Mb)