Automatic adjustment of gain and phase imbalances in LINC transmitters

Sundstrom, L.

doi:10.1049/el:19950142

Cited by 54 publications

(21 citation statements)

References 4 publications

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“…This is known as the major challenge in the outphasing architecture: achieve accurate gain and phase matching between the two RF paths [18]. This is a typical challenge for all power amplifiers consisting of multiple RF paths.…”

Section: Outphasing/lincmentioning

confidence: 99%

Efficiency Enhancement Techniques for RF and MM-Wave Power Amplifiers

Reynaert

Francois

2016

Efficient Sensor Interfaces, Advanced Amplifiers and Low Power RF Systems

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Some important aspects of CMOS RF PA design are discussed. First the reader is confronted with the ever prominent efficiency-linearity trade-off in the design of conventional amplifier classes, such as A and B, as well as the challenge to achieve high output power in low-voltage CMOS. To cope with this challenge, several power combining structures are introduced. Next, some RF PA architectures are presented to improve the efficiency at power back-off. Finally, some recently introduced architectures are discussed that use the advanced signal processing capabilities of CMOS to deal with this efficiency-linearity trade-off in RF PA design.

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Section: Outphasing/lincmentioning

confidence: 99%

Efficiency Enhancement Techniques for RF and MM-Wave Power Amplifiers

Reynaert

Francois

2016

Efficient Sensor Interfaces, Advanced Amplifiers and Low Power RF Systems

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“…Also, this I/Q signal path is used twice to generate two outphasing signals. Therefore, four digital-to-analog converters, four reconstruction filters, and two up-conversion mixer are required, which can lead to large area and high power consumption [11]. Moreover, each block can deteriorate signal linearity.…”

Section: Conventional Scs Techniquesmentioning

confidence: 99%

A CMOS Outphasing Transmitter Using Two Wideband Phase Modulators

Lee¹,

Kım²,

Song³

et al. 2011

JSTS:Journal of Semiconductor Technology and Science

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Abstract-This paper describes a CMOS outphasing transmitter using two wideband phase modulators. The proposed architecture can simplify the overall outphasing transmitter architecture using two-point phase modulation in phase-locked loop, which eliminates the necessity digital-to-analog converters, filters, and mixers. This architecture is verified with a WCDMA signal at 1.65 GHz. The prototype is fabricated in standard 130 nm CMOS technology. The measurement results satisfied the spectrum mask and 4.9% EVM performance.

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“…Unfortunately, in both architecture the speed (measured in terms of both bandwidth and slew rate) and the efficiency limitations of the AM supply modulator, together with the required increased circuit complexity represent effective To the second group can be recognized the Linear Amplification with Nonlinear Components (LINC) [6], [7], the Polar Transmitter [8], the Chireix [9] and the Doherty (DPA) architecture [10]. Although it is well recognized as a highly efficient and linear architecture, implementation constraints have limited the LINC deployment in commercial applications [3], [11], [12]. Conversely, in the DPA architecture the dynamic load modulation concept has been successfully used to boost the efficiency performances without compromising linearity [13].…”

Section: Introductionmentioning

confidence: 99%