IL analysis for 8-way power combining network in 77-110 GHz 40 nm-complementary metal-oxide-semiconductor PA design

Ching Ying Huang*, Pin Hsuan Wu, Kun Long Wu, Robert Hu, Chi Yang Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, the authors will investigate the insertion loss (IL) of the broadband 8-way power combiner used in their millimetre-wave power amplifier (PA) design. By treating this combiner as impedance transformer under resistor-capacitor (RC)loading condition, both the characteristic impedance and electrical length of the constituting metal lines can be obtained, where the much shorter line length suggests wider bandwidth and lower IL. However, proper loss analysis must take into account the multi-reflection of voltage wave along these mismatched transmission lines, i.e. the use of the power attenuation expression e−2αL is just not accurate enough. With their derived equations, it shows that the IL of their proposed 8-way combiner can be as low as 0.92 dB at 94 GHz, which is much smaller than the 1.5 dB for the conventional quarter-wavelength combiner. Mathematics for the IL of the drain-bias shunt stub and the output DC-blocking capacitor has also been derived. As a demonstration, a 77-110 GHz 40 nm-complementary metal-oxide-semiconductor PA made of cascode transistors is then designed that has more than 18 dB gain, and its OP1 dB is around 13 dBm across the whole frequency range.

Original languageEnglish
Pages (from-to)1181-1186
Number of pages6
JournalIET Circuits, Devices and Systems
Volume13
Issue number8
DOIs
StatePublished - Nov 2019

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