1 / 23

WP2.1 Design and optimization of high-linearity, high-efficiency power amplifiers and oscillators

WP Objectives. Investigate innovative linearization schemes and try their application to high-efficiency PA for wireless applicationspredistortion, feedback, feedforward, backoff Develop circuit-oriented active device models accurate in the IMP predictionsuited to the design and optimization of

fabiana
Download Presentation

WP2.1 Design and optimization of high-linearity, high-efficiency power amplifiers and oscillators

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. WP2.1 Design and optimization of high-linearity, high-efficiency power amplifiers and oscillators Prof. Giovanni Ghione P. Bianco, M. Biey, F. Bonani, F. Cappelluti, P. P. Civalleri, S. Donati, M. Gilli, C. U. Naldi

    2. WP Objectives Investigate innovative linearization schemes and try their application to high-efficiency PA for wireless applications predistortion, feedback, feedforward, backoff … Develop circuit-oriented active device models accurate in the IMP prediction suited to the design and optimization of Pas based on experimental characterization Develop software tools for the design of high complexity dynamic systems, such as oscillators based on HB and/or bifurcation analysis techniques.

    5. Ka Band MMIC PA two-tone simulation

    6. RF Hybrid Prototype characterization

    7. Device nonlinear modeling

    8. WP2.2 Experimental characterization of power devices and circuits Prof. Umberto Pisani Andrea Ferrero, Valentin Nicolae, Marco Pirola, Valeria Teppati

    9. WP Objectives Development of a new time domain load pull set up Development of innovative calibration technique for time domain load pull Experimental characterization of devices in the wireless frequency range under different modulation scheme and loading conditions Comparison of time domain and frequency domain results

    10. Load/Source Pull A well-known technique for PA design

    12. Wireless applications Wireless-oriented characterization of devices/systems Broad-band modulated signals New measurements requirements: ACPR, spectrum regrowth… Time domain waveform acquisition Open Problems Broad-band load calibration Time-domain Transition Analyzer calibration Time-domain power calibration

    13. Microwave Lab LOAD PULL SYSTEM .5-18 GHz Harmonic Load Pull system with two independent loops S-parameters capability up to 18 GHz On prober Reflectometer to allow for different power handling (up to 30W at the probe tips)

    14. Developed research activity Acquisition of Microwave Network Analyzer Wiltron Skorpion (6 GHz) CERCOM scheduled for the beginning of March Scattering, power, IM3, noise measurments Design of integration with LP system wireless modulated signals generator (CDMA, …) Time-domain investigation capabilities using load pull test set and transition analyzer in progress

    15. WP2.3 Radio over fibers: systems and devices Prof. Ivo Montrosset F. Cappelluti, V. Feies, V. Ferrero, R. Gaudino, G. Ghione, M. Gioannini, M. Goano, M. Pirola, P. Poggiolini

    16. RF photonic systems Advantages of optical fibers: broadband, low-loss transmission immune to EMI light weight, small size RF signals optical processing

    17. Program objectives System-level analysis: radio-over-fiber applications 40 GHz microwave photonic links issues system performance requirements and related devices specifications Device-level modeling and design: semiconductor lasers operating in self-pulsation or mode locking regime EO, EA modulators photodetectors

    18. Balanced EA modulator (B-EAM) for high-linearity, low-noise links

    19. Self-Pulsating 3-section DFB lasers The laser structure is a 3 section laser: two DFB sections and a passive phase control section. In proper working conditions the laser can generate free SP with pulsations frequency from 5 to 40 GHz (experimentally demonstrated); but SP up to 100 GHz are theoretically possible. There are two regimes that give SP: DSQS regime: DFB1 is polarized above threshold, DFB2, polarized at transparency, works as a passive reflector. In this case the SP frequency is the range 5-20 GHz, because it is limited by the carrier density dynamics. MB regime: both DFB works above threshold and the SP frequency is given by the “beating” of the two modes above threshold. In this case controlling the detuning between the Bragg wavelengths of the two DFB it is possible to achieve SP in a wide frequency range and the generated SP have also an higher Extinction Ratio (about 14 dB). In both MB and DSQS regimes the phase control current allow to: turn on the SP - obtain a fine tuning of the SP frequency The laser structure is a 3 section laser: two DFB sections and a passive phase control section. In proper working conditions the laser can generate free SP with pulsations frequency from 5 to 40 GHz (experimentally demonstrated); but SP up to 100 GHz are theoretically possible. There are two regimes that give SP: DSQS regime: DFB1 is polarized above threshold, DFB2, polarized at transparency, works as a passive reflector. In this case the SP frequency is the range 5-20 GHz, because it is limited by the carrier density dynamics. MB regime: both DFB works above threshold and the SP frequency is given by the “beating” of the two modes above threshold. In this case controlling the detuning between the Bragg wavelengths of the two DFB it is possible to achieve SP in a wide frequency range and the generated SP have also an higher Extinction Ratio (about 14 dB). In both MB and DSQS regimes the phase control current allow to: turn on the SP - obtain a fine tuning of the SP frequency

    20. Theoretical model, numerical analysis and design: It has been implemented some computer programs for the design and analysis of SP-DFB. The programs allow to: - through a static analysis, find the proper working conditions that give SP once the SP conditions are found (e.g. detuning, currents to inject in each section), simulate the characteristics of the SP signal. The model implemented in this case is based on the TDTW equations. The figures present an example of simulation results. We show the optical output power (output frequency 30.68 GHz and ER=14 dB) and the corresponding optical spectrum. In the spectrum the two modes that are responsible for the SP are visible.It has been implemented some computer programs for the design and analysis of SP-DFB. The programs allow to: - through a static analysis, find the proper working conditions that give SP once the SP conditions are found (e.g. detuning, currents to inject in each section), simulate the characteristics of the SP signal. The model implemented in this case is based on the TDTW equations. The figures present an example of simulation results. We show the optical output power (output frequency 30.68 GHz and ER=14 dB) and the corresponding optical spectrum. In the spectrum the two modes that are responsible for the SP are visible.

    21. EO Modulators modeling and design Integrated circuit CAD model for EOM analysis and design: extraction of AM and chirp in small- and large-signal conditions from the electrode geometry flexibility in analysis, optimization and tuning of complex structures, also accounting for package and other parasitics integrated simulation with driver circuitry

    22. High-speed TW-EAMs Circuit-oriented modeling quasi-static frequency-domain model: bandwidth large-signal time-domain model: RF and optical power saturation effects frequency chirp

    23. BEAM link performance

More Related