J. Lees

发表

Comparison of load-pull measurement results of a 4 W pHEMT involving five European laboratories

J. Lees, J. Benedikt, B. Bunz, 2005, European Gallium Arsenide and Other Semiconductor Application Symposium, GAAS 2005.

Wide band high-efficiency power amplifier design

P. J. Tasker, J. Lees, J. Benedikt, 2011, 2011 6th European Microwave Integrated Circuit Conference.

European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 42nd European Microwave Conference, EuMC 2012

Jp McGeehan, Mark A Beach, J. Lees, 2012 .

The Design of a Gallium Nitride Doherty Amplifier Using Waveform Measurements and Active Harmonic Load-Pull

J. Lees, J. Benedikt, A. Sheikh, 2006, 2006 International Workshop on Integrated Nonlinear Microwave and Millimeter-Wave Circuits.

Novel wide band high-efficiency active harmonic injection power amplifier concept

P. J. Tasker, J. Lees, J. Benedikt, 2010, 2010 IEEE MTT-S International Microwave Symposium.

Inverse active load-pull in an inverse Doherty amplifier

P. J. Tasker, J. Lees, J. Benedikt, 2013, 2013 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications.

An improved electric field probe with applications in high efficiency PA design and diagnostics

J. Lees, N. Dehghan, S. Cripps, 2013, 81st ARFTG Microwave Measurement Conference.

Frequency scalable large signal transistor behavioral model based on admittance domain formulation

P. J. Tasker, J. Lees, D. E. Root, 2014, 2014 IEEE MTT-S International Microwave Symposium (IMS2014).

On the Continuity of High Efficiency Modes in Linear RF Power Amplifiers

J. Lees, J. Benedikt, A. L. Clarke, 2009, IEEE Microwave and Wireless Components Letters.

Development of a RF waveform stress test procedure for GaN HFETs subjected to infinite VSWR sweeps

P. J. Tasker, J. Lees, J. Benedikt, 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.

Exploring the design space for broadband pas using the novel “continuous inverse class-F mode”

P. J. Tasker, J. Lees, J. Benedikt, 2011, 2011 41st European Microwave Conference.

High-speed device characterization using an active load-pull system and waveform engineering postulator

P. J. Tasker, J. Lees, J. Benedikt, 2011, 77th ARFTG Microwave Measurement Conference.

A Methodology for Realizing High Efficiency Class-J in a Linear and Broadband PA

J. Lees, J. Benedikt, P.J. Tasker, 2009, IEEE Transactions on Microwave Theory and Techniques.

Systematic investigation of the impact of harmonic termination in the efficiency performance of above octave bandwidth microwave amplifiers

P. J. Tasker, J. Lees, J. Benedikt, 2009, 2009 European Microwave Conference (EuMC).

Inverse class-FJ: Experimental validation of a new PA voltage waveform family

P. J. Tasker, J. Lees, J. Benedikt, 2011, Asia-Pacific Microwave Conference 2011.

High power active harmonic load-pull system for characterization of high power 100-watt transistors

J. Lees, J. Benedikt, A. Sheikh, 2005, 2005 European Microwave Conference.

Investigation of electrical base-band memory effects in high-power 20W LDMOS power amplifiers

J. Lees, J. Benedikt, P. Tasker, 2007, 2007 European Microwave Conference.

Investigation and analysis into device optimization for attaining efficiencies in-excess of 90% when accounting for higher harmonics

P. J. Tasker, J. Lees, J. Benedikt, 2010, 2010 IEEE MTT-S International Microwave Symposium.

Power amplifier memory-less pre-distortion for 3GPP LTE application

P. J. Tasker, M. Beach, J. Lees, 2009, 2009 European Microwave Conference (EuMC).

A LSNA configured to perform baseband engineering for device linearity investigations under modulated excitations

P. J. Tasker, M. Beach, J. Lees, 2013, 2013 European Microwave Conference.

Investigating the linearity versus efficiency trade-off of different power amplifier modes in an envelope tracking architecture

P. J. Tasker, J. Lees, Z. A. Mokhti, 2015, 2015 European Microwave Conference (EuMC).

The inverse Doherty amplifier using a reduced peaking amplifier drain supply voltage

M. Beach, J. Lees, J. Benedikt, 2012, 2012 IEEE International Conference on Wireless Information Technology and Systems (ICWITS).

Controlling Active Load–Pull in a Dual-Input Inverse Load Modulated Doherty Architecture

P. J. Tasker, J. Lees, J. Benedikt, 2012, IEEE Transactions on Microwave Theory and Techniques.

An efficient, linear, broadband class-J-mode PA realised using RF waveform engineering

P. J. Tasker, J. Lees, J. Benedikt, 2009, 2009 IEEE MTT-S International Microwave Symposium Digest.

Single-tone optimisation of an adaptive-bias Doherty structure

J. Lees, J. Benedikt, P.J. Tasker, 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

Using waveform engineering to optimize Class-F power amplifier performance in an envelope tracking architecture

P. J. Tasker, J. Lees, Z. A. Mokhti, 2014, 2014 9th European Microwave Integrated Circuit Conference.

High speed non-linear device characterization and uniformity investigations at X-band frequencies exploiting behavioral models

P. J. Tasker, J. Lees, J. Benedikt, 2011, 77th ARFTG Microwave Measurement Conference.

European Microwave Week 2014: "Connecting the Future", EuMW 2014 - Conference Proceedings; EuMIC 2014: 9th European Microwave Integrated Circuits Conference

Jp McGeehan, Mark A Beach, J. Lees, 2014 .

Electronic multi-harmonic load-pull system for experimentally driven power amplifier design optimization

P. J. Tasker, J. Lees, J. Benedikt, 2009, 2009 IEEE MTT-S International Microwave Symposium Digest.

Exploitation of active load-pull and DLUT models in MMIC design

J. Lees, J. Benedikt, P.J. Tasker, 2010, 2010 IEEE Radio Frequency Integrated Circuits Symposium.

Continuous class BJ power amplifier with DGS output matching

P. J. Tasker, J. Lees, H. Choi, 2014, 2014 IEEE MTT-S International Microwave Symposium (IMS2014).

Utilization of a measurement based CAD tool for enhanced pa design investigations

J. Lees, J. Benedikt, A. Sheikh, 2008, 2008 European Conference on Wireless Technology.

Enhanced vector calibration of load-pull measurement systems

P. J. Tasker, J. Lees, Tudor Williams, 2014, 83rd ARFTG Microwave Measurement Conference.

Linearity enhancement of GaN HEMTs under complex modulated excitation by optimizing the baseband impedance environment

P. J. Tasker, M. Beach, J. Lees, 2011, 2011 IEEE MTT-S International Microwave Symposium.

Design and characterization of an ultrasonic lamb-wave power delivery system

J. Lees, K. Holford, A. Kural, 2013, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control.

The impact of baseband electrical memory effects on the dynamic transfer characteristics of microwave power transistors

P. J. Tasker, M. Beach, J. Lees, 2010, 2010 Workshop on Integrated Nonlinear Microwave and Millimeter-Wave Circuits.

A waveform engineering approach to the design of improved efficiency wideband MMIC amplifiers

J. Lees, J. Benedikt, P.J. Tasker, 2011, WAMICON 2011 Conference Proceedings.

Waveform engineering applied to linear-efficient PA design

M. Beach, J. Lees, J. Benedikt, 2010, 2010 IEEE 11th Annual Wireless and Microwave Technology Conference (WAMICON).

Behavioral model analysis using simultaneous active fundamental load-pull and harmonic source-pull measurements at X-band

P. J. Tasker, J. Lees, J. Benedikt, 2011, 2011 IEEE MTT-S International Microwave Symposium.

European Microwave Conference 2010 (EuMC), Paris, France

Jp McGeehan, Mark A Beach, J. Lees, 2010 .

Using active IF load-pull to investigate electrical base-band induced memory effects in high-power LDMOS transistors

J. Lees, J. Benedikt, P. Tasker, 2007, 2007 Asia-Pacific Microwave Conference.

X-band behavioral model analysis using an active harmonic source- pull and load-pull measurement system

P. J. Tasker, J. Lees, J. Benedikt, 2011, Asia-Pacific Microwave Conference 2011.

Generic Pre-distortion of a Class-J power amplifier

M. Beach, J. Lees, J. Benedikt, 2010, The 40th European Microwave Conference.

Demystifying Device related Memory Effects using Waveform Engineering and Envelope Domain Analysis

J. Lees, J. Benedikt, S. Cripps, 2008, 2008 38th European Microwave Conference.

Linearity improvement in RF power amplifier system using integrated Auxiliary Envelope Tracking system

P. J. Tasker, J. Lees, J. Benedikt, 2011, 2011 IEEE MTT-S International Microwave Symposium.

European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 7th European Microwave Integrated Circuits Conference, EuMIC 2012

Jp McGeehan, Mark A Beach, J. Lees, 2012 .

Correlation analysis between a VNA-based passive load pull system and an oscilloscope-based active load pull system: A case study

J. Lees, P. Tasker, Z. Mokhti, 2014, 83rd ARFTG Microwave Measurement Conference.

Behavioral model analysis of active harmonic load-pull measurements

P. J. Tasker, J. Lees, J. Benedikt, 2010, 2010 IEEE MTT-S International Microwave Symposium.

Sensitivity of AM/AM linearizer to AM/PM distortion in devices

J. Lees, J. Benedikt, S. Bensmida, 2014, 83rd ARFTG Microwave Measurement Conference.

X-band MMIC scalable large signal model based on unit cell behavioral data model and passive embedding network

P. J. Tasker, J. Lees, M. Koh, 2013, 2013 IEEE MTT-S International Microwave Symposium Digest (MTT).

IEEE International Microwave Symposium 2011 (IMS2011), Baltimore, Maryland, USA

Jp McGeehan, Mark A Beach, J. Lees, 2011 .

RF power amplifier design for high-efficiency applications

J. Lees, Paul J. Tasker, Johannes Benedikt, 2008, Security + Defence.

A novel measurement based method enabling rapid extraction of a RF Waveform Look-Up table based behavioral model

P. J. Tasker, J. Lees, J. Benedikt, 2008, 2008 IEEE MTT-S International Microwave Symposium Digest.

An intelligence driven active loadpull system

P. J. Tasker, J. Lees, J. Benedikt, 2010, 75th ARFTG Microwave Measurement Conference.

A 40W push-pull power amplifier for high efficiency, decade bandwidth applications at microwave frequencies

P. J. Tasker, J. Lees, J. Benedikt, 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.

An enhanced modulated waveform measurement system for the robust characterization of microwave devices under modulated excitation

P. J. Tasker, M. Beach, J. Lees, 2011, 2011 6th European Microwave Integrated Circuit Conference.

A Novel Formulation for High Efficiency Modes in Push-Pull Power Amplifiers Using Transmission Line Baluns

P. J. Tasker, J. Lees, J. Benedikt, 2012, IEEE Microwave and Wireless Components Letters.

The Continuous Inverse Class-F Mode With Resistive Second-Harmonic Impedance

P. J. Tasker, J. Lees, J. Benedikt, 2012, IEEE Transactions on Microwave Theory and Techniques.

Investigation of Various Envelope Complexity Linearity under Modulated Stimulus Using a New Envelope Formulation Approach

P. J. Tasker, M. Beach, J. Lees, 2014, 2014 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS).

Optimized load modulation in a Doherty amplifier using a current injection technique

M. Beach, J. Lees, J. Benedikt, 2011, 2011 6th European Microwave Integrated Circuit Conference.

Operation and calibration of VNA-based large signal RF I-V waveform measurements system without using a harmonic phase reference standard

J. Lees, P.J. Tasker, A. Aldoumani, 2013, 81st ARFTG Microwave Measurement Conference.

A design methodology for the realization of multi-decade baluns at microwave frequencies

P. J. Tasker, J. Lees, J. Benedikt, 2011, 2011 IEEE MTT-S International Microwave Symposium.

The effect of baseband impedance termination on the linearity of GaN HEMTs

P. J. Tasker, M. Beach, J. Lees, 2010, The 40th European Microwave Conference.

A novel highly efficient broadband continuous class-F RFPA delivering 74% average efficiency for an octave bandwidth

P. J. Tasker, J. Lees, J. Benedikt, 2011, 2011 IEEE MTT-S International Microwave Symposium.

Nonlinear envelope tracking for efficiency optimization of power amplifiers

P. J. Tasker, J. Lees, J. Benedikt, 2012, 2012 7th European Microwave Integrated Circuit Conference.

Wideband PA Design: The "Continuous" Mode of Operation

P. J. Tasker, J. Lees, J. Benedikt, 2012, 2012 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS).

An Accurate Calibrate-Able Multiharmonic Active Load–Pull System Based on the Envelope Load–Pull Concept

J. Lees, J. Benedikt, P.J. Tasker, 2010, IEEE Transactions on Microwave Theory and Techniques.

A NOVEL FORMULATION FOR DEFINING LINEARISING BASEBAND INJECTION SIGNALS OF RF POWER AMPLIFIER DEVICES UNDER ARBITRARY MODULATION

M. Beach, J. Lees, J. Benedikt, 2014 .

Continuous-ClassF3 power amplifier mode varying simultaneously first 3 harmonic impedances

M. Schlechtweg, J. Lees, J. Benedikt, 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.

Investigating the linearity versus efficiency tradeoff of different power amplifier modes in an envelope tracking architecture

J. Lees, P. J. Tasker, Z. A. Mokhti, 2015, 2015 10th European Microwave Integrated Circuits Conference (EuMIC).

Non-linear large signal PA modelling for switching-mode operation (class-F/continuous class-F)

M. Beach, J. Lees, J. Benedikt, 2011, 2011 6th European Microwave Integrated Circuit Conference.

Minimization of baseband electrical memory effects in GaN HEMTs using active IF load-pull

M. Beach, J. Lees, J. Benedikt, 2010, 2010 Asia-Pacific Microwave Conference.

The benefit of GaN characteristics over LDMOS for linearity improvement using drain modulation in power amplifier system

J. Lees, J. Benedikt, M. Akmal, 2011, 2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits.

Interpolation and extrapolation capabilities of non-linear behavioural models

J. Lees, J. Benedikt, P. J. Tasker, 2011, 78th ARFTG Microwave Measurement Conference.

Characterisation of an experimental gallium nitride microwave Doherty amplifier

J. Lees, J. Benedikt, J. Powell, 2005, 2005 European Microwave Conference.

Utilization of a Measurement Based CAD Tool for Enhanced PA Design Investigations

J. Lees, J. Benedikt, A. Sheikh, 2008, 2008 38th European Microwave Conference.

Sensitivity analysis of GaN power amplifier model parameters for switching-mode operation

M. Beach, J. Lees, J. Benedikt, 2012, 2012 7th European Microwave Integrated Circuit Conference.

Overlapped segment piece-wise polynomial pre-distortion for the linearisation of power amplifiers in the presence of high PAPR OFDM signals

J. Lees, J. Benedikt, S. Bensmida, 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.