A Constant Envelope Phase Modulator for 2.4 GHz WLAN Radio Polar Transmitters in 0.18 um CMOS

A low-noise phase modulator, using finite-impulse-response (FIR) filtering embedded delta-sigma (ΔΣ) fractional-N phase-locked loop (PLL), is fabricated in 0.18 μm CMOS for GSM/EDGE polar transmitters. A simplified digital compensation filter with inverse-FIR and -PLL features is proposed to trade off the transmitter noise and linearity. Experimental results show that the presented architecture performs RF phase modulation well with 20 mW power dissipation from 1.6 V supply and achieves the root-mean-square (rms) and peak phase errors of 4° and 8.5°, respectively. The measured and simulated phase noises of −104 dBc/Hz and −120 dBc/Hz at 400-kHz offset from 1.8-GHz carrier frequency are observed, respectively.

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Generalized Transparent Constant Envelope Multiplexing Method

Proceedings of the 2016 International Technical Meeting of The Institute of Navigation ◽

10.33012/2016.13445 ◽

2016 ◽

Cited By ~ 2

Author(s):

Fu Guo ◽

Zheng Yao ◽

Mingquan Lu ◽

Hengwei Zhou

Keyword(s):

Constant Envelope

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Phase Optimized Constant Envelope Transmission (POCET) and the Method of Phantom Signals

Proceedings of the ION 2017 Pacific PNT Meeting ◽

10.33012/2017.15041 ◽

2017 ◽

Author(s):

Philip A. Dafesh ◽

Gourav K. Khadge

Keyword(s):

Constant Envelope

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Dynamic Power Allocation with Constant Envelope Transmission for Next Generation Software-Defined GPS Payloads

Proceedings of the 2018 International Technical Meeting of The Institute of Navigation ◽

10.33012/2018.15560 ◽

2018 ◽

Author(s):

Seeley Pentecost ◽

Sanjeev Gunawardena

Keyword(s):

Power Allocation ◽

Next Generation ◽

Dynamic Power ◽

Constant Envelope

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Improvement of Carrier Power to Third-Order Intermodulation Distortion Power Ratio for a Power Amplifier at 5.25 GHz using LINC Method

The Open Electrical & Electronic Engineering Journal ◽

10.2174/1874129001812010034 ◽

2018 ◽

Vol 12 (1) ◽

pp. 34-40

Author(s):

Said Elkhaldi ◽

Naima Amar Touhami ◽

Mohamed Aghoutane ◽

Taj-eddin Elhamadi

Keyword(s):

Power Amplifier ◽

Artificial Neural Network Model ◽

Power Ratio ◽

Linear Amplification ◽

Third Order ◽

Gaas Mesfet ◽

Constant Envelope ◽

Modulation Signal ◽

Low Efficiency ◽

Nonlinear Components

Introduction:This paper focuses on improving the power amplifier linearity for wireless communications. The use of a single branch of a power amplifier can produce high distortion with low efficiency.Method:In this paper, the Linear Amplification with Nonlinear Components (LINC) technique is used to improve the linearity and efficiency of the power amplifier. The LINC technique is based on converting the envelope modulation signal into two constant envelope phase-modulated baseband signals. After amplification and combining the resulting signals, the required linear output signal is obtained. To validate the proposed approach, LINC technique is used for linearizing an amplifier based on a GaAs MESFET (described by an artificial neural network Model).Conclusion:Good results have been achieved, and an improvement of about 40.80 dBc and 47.50 dBc respectively is obtained for the Δlower C/I and Δupper C/I at 5.25 GHz.

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