Injection locking phase rotator for Outphasing transmitter

This paper presents a novel technique of implementing the amplitude information into out-phase mapping, which is a necessary block of the high-efficiency Outphasing transmitter architecture. The proposed technique is based on using injection locking ring oscillator and switching-based control circui...

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Bibliographic Details
Published in:Microelectronics 2015-06, Vol.46 (6), p.447-452
Main Authors: Elmala, Mostafa A.I., Shawkey, Heba A.
Format: Article
Language:English
Subjects:
Amplitude to phase modulation
Injection locking ring oscillator
Out-phasing transmitter
Phase modulation
Phase rotator
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Summary:This paper presents a novel technique of implementing the amplitude information into out-phase mapping, which is a necessary block of the high-efficiency Outphasing transmitter architecture. The proposed technique is based on using injection locking ring oscillator and switching-based control circuit to implement phase rotator. The technique is compatible with digital implementation using DSP. Since, Outphasing transmitters use switching power amplifiers, this implementation is suitable for an all-digital and adjustable transmitter implementation. The modulator system is designed using UMC130nm CMOS technology; and is simulated at 1.8GHz operation frequency, as it is commonly used in multiple mobile applications requiring high power levels. Simulation shows an out-phasing error of 0.41°rms, across the whole input amplitude sweep of 45dB. The power consumption of the single phase rotator is 1.5mW from 1.2V supply.
ISSN:1879-2391
1879-2391
DOI:10.1016/j.mejo.2015.03.006