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20 GHz Clock Frequency ROM-Less Direct Digital Synthesizer Comprising Unique Phase Control Unit in 0.25 µm SiGe Technology
/forschung/publikationen/20-ghz-clock-frequency-rom-less-direct-digital-synthesizer-comprising-unique-phase-control-unit-in-025-um-sige-technology
This paper presents work on a 20 GHz ROM-less direct digital synthesizer (DDS) with 12-bit phase and 6-bit amplitude resolution in a 0.25µm SiGe technology having ft/fmax 180/220GHz. The…
A Hetero-Integrated W-Band Transmitter Module in InP-on-BiCMOS Technology
/forschung/publikationen/a-hetero-integrated-w-band-transmitter-module-in-inp-on-bicmos-technology
This paper presents a W-band hetero-integrated transmitter module using InP-on-BiCMOS technology. It consists of a Phase Locked Loop (PLL) in 0.25 µm BiCMOS technology and a frequency…
An Ultra-broadband Low-Noise Distributed Amplifier in InP DHBT Technology
/forschung/publikationen/an-ultra-broadband-low-noise-distributed-amplifier-in-inp-dhbt-technology
This paper reports an ultra-wideband low-noise amplifier in a transferred-substrate InP DHBT technology. The wideband characteristics are obtained by using a distributed topology with cascode unit…
Highly Efficient D-Band Fundamental Frequency Source Based on InP-DHBT Technology
/forschung/publikationen/highly-efficient-d-band-fundamental-frequency-source-based-on-inp-dhbt-technology
Local oscillator signal generation with low phasenoise is an important topic for future communications systems operating in D-band and beyond. This paper presents a D-band fundamental reflection-type…
Highly Compact GaN-based All-Digital Transmitter Chain Including SPDT Switch for Massive MIMO
/forschung/publikationen/highly-compact-gan-based-all-digital-transmitter-chain-including-spdt-switch-for-massive-mimo
This paper presents a fully digital transmitter chain from baseband to antenna, including a modulator, a truly digital (i.e. switch mode) microwave power amplifier and a transmit / receive switch.…
Dynamic Over-Voltage Operation of a Discrete-Level Supply-Modulated GaN-based RF PA
/forschung/publikationen/dynamic-over-voltage-operation-of-a-discrete-level-supply-modulated-gan-based-rf-pa
In this paper an investigation for increasing the peak output power of a GaN-based RF power amplifier (PA) by dynamically operating it at a higher supply voltage is presented. The PA is operated with…
Versatility, Bandwidth and Efficiency: Digital GaN-Based Switch-Mode Supply Modulators
/forschung/publikationen/versatility-bandwidth-and-efficiency-digital-gan-based-switch-mode-supply-modulators
In this paper the versatility of ultra-fast and, at the same time, high-power capable digital electronics is demonstrated. An electronic switch based on 0.25µm GaN HEMT technology, originally…
Analysis of Dissipated Power in Envelope Amplifier Output Filters
/forschung/publikationen/analysis-of-dissipated-power-in-envelope-amplifier-output-filters
The paper addresses power dissipation within the output filter of a buck-converter-based envelope amplifier (EA) and its effect on the overall envelope tracking (ET) system efficiency. For a…
Impact of Substrate Modes on mTRL-Calibrated CPW Measurements in G Band
/forschung/publikationen/impact-of-substrate-modes-on-mtrl-calibrated-cpw-measurements-in-g-band
On-wafer measurements at microwave and mm-wave frequencies require reliable calibration processes to deduct unwanted effects such as the impact of probe, the wafer environment, and the…
Nonlinear Three-Port Characterization of a Class-G Supply Modulated RF Power Amplifier using a Nonlinear Vector Network Analyzer
/forschung/publikationen/nonlinear-three-port-characterization-of-a-class-g-supply-modulated-rf-power-amplifier-using-a-nonlinear-vector-network-analyzer
A three-port nonlinear characterization system for 5G Envelope Tracking Power Amplifiers (ET PAs) is presented in this paper. The system allows measurement of wideband injected and reflected Radio…