Search Results - "Pedro, Jose C."

Sequential LMBA Design Technique for Improved Bandwidth Considering the Balanced Amplifiers off-State Impedance by Belchior, Catarina, Nunes, Luis C., Cabral, Pedro M., Pedro, Jose C.

“…This work proposes a design technique to improve the bandwidth of sequential load-modulated balanced amplifiers (SLMBAs). It is theoretically demonstrated that…”
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AM/AM and AM/PM Distortion Generation Mechanisms in Si LDMOS and GaN HEMT Based RF Power Amplifiers by Cotimos Nunes, Luis, Cabral, Pedro M., Pedro, Jose C.

“…This paper provides a comprehensive analysis of the AM/AM and AM/PM nonlinear distortion generation mechanisms arising in the most common RF power amplifier…”
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A Hammerstein-Like Broadband ANN-Based Transistor Behavioral Model by Louro, Joao, Nunes, Luis C., Barradas, Filipe M., Cunha, Telmo R., Cabral, Pedro M., Pedro, Jose C.

“…This work presents a broadband artificial neural network (ANN)-based transistor behavioral model (BM). The model is based on load-pull and <inline-formula>…”
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On the Energy Nonconservation in the FET's Equivalent Circuit Capacitance Model by Gomes, Joao L., Barradas, Filipe M., Nunes, Luis C., Pedro, Jose C.

“…This article answers the long existing quest on how to conciliate a non-reciprocal capacitance formulation in the equivalent circuit model of field-effect…”
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The Effect of IMD Drain Impedances in RF PA Concurrent Dual-Band Operation by Barradas, Filipe M., Nunes, Luis C., Louro, Joao, Barros, Diogo R., Cabral, Pedro M., Pedro, Jose C.

“…This article develops a theory to explain the effect of controlling the impedance at the intermodulation distortion (IMD) frequencies, related to the…”
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Efficiency Degradation Analysis in Wideband Power Amplifiers by Nunes, Luis Cotimos, Barros, Diogo R., Cabral, Pedro M., Pedro, Jose C.

“…This paper addresses the mechanisms of wideband power amplifiers' efficiency degradation in comparison with their narrowband operation. It starts by…”
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Power, Linearity, and Efficiency Prediction for MIMO Arrays With Antenna Coupling by Barradas, Filipe M., Tome, Pedro M., Gomes, Jose M., Cunha, Telmo R., Cabral, Pedro M., Pedro, Jose C.

“…Modern and future transmitter architectures are being driven toward multi-input multi-output (MIMO) transceivers, which make use of several radio frequency…”
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The Impact of Long-Term Memory Effects on the Linearizability of GaN HEMT-Based Power Amplifiers by Gomes, Joao L., Nunes, Luis C., Barradas, Filipe M., Cooman, Adam, de Jong, Aryan E. F., Heeres, Rob M., Pedro, Jose C.

“…This article presents how the emission time constant of deep-level traps is responsible for the achievable linearity (linearizability) degradation of gallium…”
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Broadband SLMBA Design Including 90° Hybrid Frequency Response using an Automatic Methodology by Belchior, Catarina, Nunes, Luis C., Cabral, Pedro M., Pedro, Jose C.

“…This article proposes an automatic methodology for the design of a sequential load-modulated balanced amplifier (SLMBA), which takes corrections for its output…”
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Theory and Design of Doherty Power Amplifier With Active Harmonic Injection by Latha, Y. Mary Asha, Nunes, Luis C., Barradas, Filipe M., Pedro, Jose C.

“…This paper analyzes the performance of the Doherty power amplifier (DPA) with the injection of the second harmonic component generated by the carrier power…”
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Validation and Physical Interpretation of the Power-Amplifier Polar Volterra Model by Cunha, T R, Lima, E G, Pedro, José C

“…Although the Cartesian signal decomposition has been the preferred representation in baseband polynomial power-amplifier (PA) behavioral models, this is not…”
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The Impact of a Taper Impedance Transformation on the TRL De-Embedding Error by Louro, Joao, Nunes, Luis C., Barradas, Filipe M., Cabral, Pedro M., Pedro, Jose C.

“…This work originates from the realization that, in a transformed impedance thru-reflect-line (TRL) calibration, the sensitivity to random measurement errors is…”
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A Physically Meaningful Neural Network Behavioral Model for Wireless Transmitters Exhibiting PM-AM/PM-PM Distortions by Lima, E. G., Cunha, T. R., Pedro, J. C.

“…Artificial neural networks (ANNs) have been widely used to model wireless transmitter low-pass equivalent behavior. However, previously proposed ANNs either do…”
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Polynomials and LUTs in PA Behavioral Modeling: A Fair Theoretical Comparison by Barradas, Filipe M., Cunha, Telmo R., Lavrador, Pedro M., Pedro, Jose C.

“…Traditionally, power amplifier behavioral modeling and digital predistortion have been based on polynomials or Volterra series. Recently, however, there has…”
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An Improved Extraction Method for the Trapping Time Constants in GaN HEMTs by Lopes, Ines C., Nunes, Luis C., Cabral, Pedro M., Pedro, Jose C.

“…With Gallium Nitride (GaN) High Electron Mobility Transistors (HEMTs) being the preferred solution for radio frequency (RF) power applications, there is a…”
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A Multiple Time-Scale Power Amplifier Behavioral Model for Linearity and Efficiency Calculations by Pedro, J. C., Cabral, P. M., Cunha, T. R., Lavrador, P. M.

“…This work describes a new power amplifier, PA, behavioral model intended to predict both the PA amplitude and phase input-output signal relationship and the…”
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Envelope Modulator Selection for RF Carrier Phase-Burst Transmitters by Pires, Sergio C., Cabral, Pedro M., Pedro, Jose C.

“…This letter analyzes the performance of RF carrier phase-burst transmitters, implemented with a single-ended switched-mode power amplifier. Using a practical…”
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A Physics-Based 1-D Equivalent Circuit Model for an AlGaN/GaN HEMT by Pedro, Jose C., Nunes, Luis C., Alavijeh, Ahmad Shafiei

“…This work presents a physics-based 1-D equivalent-circuit model (ECM) for an AlGaN/GaN HEMT. For that, it starts with the thorough derivation of an analytical…”
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Switching Noise Improvement of a Limit-Cycle Amplifier Using a Negative Hysteresis Relay by Duarte, Manuel J., Cabral, Pedro M., Pedro, Jose C.

“…Limit-cycle or self-oscillating power amplifiers (SOPAs) are seen as an effective and simple option to achieve linear yet efficient power amplification…”
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Reduced-Order Parametric Behavioral Model for Digital Buffers/Drivers With Physical Support by Dghais, W., Cunha, T. R., Pedro, J. C.

“…In this paper, we present a new behavioral model for high-speed digital output buffers/drivers. In the conceived model, the output current's relationship with…”
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