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GaN MMIC Active Arrays with Space Power Combination
/en/research/publications/gan-mmic-active-arrays-with-space-power-combination
This paper discusses the implementation of a K/Ka band GaN MMIC for developing space active arrays with space power combination, as a way to overcome TWTA needs. The obtained results, including the…
Highly Efficient Class-G Supply-Modulated Amplifier with 75 MHz Modulation Bandwidth for 1.8-1.9 GHz LTE FDD Applications
/en/research/publications/highly-efficient-class-g-supply-modulated-amplifier-with-75-mhz-modulation-bandwidth-for-18-19-ghz-lte-fdd-applications
This paper presents a broadband and highly efficient class-G supply modulated amplifier system. The system covers the full LTE band 1805-1880 MHz. The core element is the class-G supply…
An Active Balanced Up-Converter Module in InP-on-BiCMOS Technology
/en/research/publications/an-active-balanced-up-converter-module-in-inp-on-bicmos-technology
This paper presents an active up-converter realized as hetero-integrated module in InP-on-BiCMOS technology. It consists of a fundamental Voltage Controlled Oscillator (VCO) in 0.25 µm…
A 14 W Wideband Supply-Modulated System with Reverse Buck Converter and Floating-Ground RF Power Amplifier
/en/research/publications/a-14-w-wideband-supply-modulated-system-with-reverse-buck-converter-and-floating-ground-rf-power-amplifier
This paper presents a wideband supply-modulated system with a floating ground RF power amplifier and a reverse buck topology DC/DC converter. The power amplifier and the reverse buck converter are…
Thick-Film MIM BST Varactors for GaN Power Amplifiers with Discrete Dynamic Load Modulation
/en/research/publications/thick-film-mim-bst-varactors-for-gan-power-amplifiers-with-discrete-dynamic-load-modulation
Due to their extremely low static current consumption, varactors based on BST are perfect devices for realization of tunable and re-configurable components. This work presents fully screen-printed…
A Drain Lag Model for GaN HEMT based on Chalmers Model and Pulsed S-Parameter Measurements
/en/research/publications/a-drain-lag-model-for-gan-hemt-based-on-chalmers-model-and-pulsed-s-parameter-measurements
This paper addresses a novel approach to account for trapping effects in the large-signal description of GaN HEMTs. Instead of relying on an internal effective gate voltage, which is not very…
Watt-level yellow emitting lasers by frequency doubling of high power diode lasers
/en/research/publications/watt-level-yellow-emitting-lasers-by-frequency-doubling-of-high-power-diode-lasers
Distributed Bragg reflector tapered diode lasers (DBR-TPL) based on a quantum-well structure are presented, which emit at various wavelengths between 1100 and 1200 nm. Long lifetimes of these…
Reconfigurable Packaged GaN Power Amplifier Using Thin-Film BST Varactors
/en/research/publications/reconfigurable-packaged-gan-power-amplifier-using-thin-film-bst-varactors
A compact and reconfigurable GaN HEMT power amplifier using thin-film BST varactors, mounted inside a customized RF package is presented. With tuning of input and output matching networks several…
The Efficiency/Bandwidth Trade-Off in Class-G Supply-Modulated Power Amplifiers
/en/research/publications/the-efficiencybandwidth-trade-off-in-class-g-supply-modulated-power-amplifiers
This work deals with class-G, i.e. discrete level, supply modulated systems. It is investigated how the efficiency improvement achievable through this approach depends on the maximum switching…
Pulsed RF Characterization of Envelope Tracking Systems for Improved Shaping Function Extraction
/en/research/publications/pulsed-rf-characterization-of-envelope-tracking-systems-for-improved-shaping-function-extraction
This paper presents a measurement setup for pulsed RF characterization of a buck-converter based envelope tracking (ET) system. In contrast to continuous wave (CW) measurements, the proposed method…