A digitally-tuned triple-band transformer power combiner for CMOS power amplifiers

This paper presents the design and implementation of a CMOS transformer combiner that can be reconfigured to have similar efficiencies at widely separated frequency bands. Conventional transformer combiners employ a fixed tuning capacitance in the secondary network to optimize the efficiency for sin...

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Bibliographic Details
Main Authors: Singh, Rahul, Paramesh, Jeyanandh
Format: Conference Proceeding
Language:English
Subjects:
Capacitance
Capacitors
CMOS technology
Frequency measurement
Power amplifiers
Power combiners
Switches
transformer
Tunable circuits and devices
Tuning
Online Access:Request full text
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Summary:This paper presents the design and implementation of a CMOS transformer combiner that can be reconfigured to have similar efficiencies at widely separated frequency bands. Conventional transformer combiners employ a fixed tuning capacitance in the secondary network to optimize the efficiency for single frequency standard. In this work, we present a modified transformer combiner where digitally-switchable capacitors introduced at low-swing nodes within the combiner network enable frequency reconfiguration using CMOS switches. A 65 nm CMOS triple-band (2.5/3/3.5 GHz) power amplifier (PA) chip employing the reconfigurable combiner is also presented.
ISSN:2375-0995
DOI:10.1109/RFIC.2017.7969085