The inspection of the current and voltage waveforms at source reference planes transistor models provides power amplifier (PA) designers with useful insights for identifying class operation PAs. However when a specific plane is targeted, time-consuming multi-harmonic load- source-pull simulations are required. Alternatively if design started targeted PA architecture, load terminations package given level can be calculated in single simulation help an embedding device model. application model...

This work presents a power amplifier design approach for frequency reconfiguration between two arbitrarily-spaced bands. The method uses parallel matching networks whose designs are de-coupled through the topology choice. low-band network is constrained to consist of shunt reactive element connected quarter-wavelength transmission lines at higher frequency. A switch placed in reactance enable isolation this path from high-frequency response when on. architecture demonstrated GaAs MMIC...

The challenges associated with efficiently and effectively linearizing a nonlinear power amplifier (PA) over wide signal bandwidths are increasingly important to the design of 5G front-ends. Conventional digital linearization techniques limited by absolute bandwidth, while RF-domain PA typically exhibits consistent fractional bandwidth even as carrier frequency is increased. Therefore, techniques, like those focusing on bias-line impedance selection, critical for overall distortion...

This work studies the effect of switch figure merit on frequency-reconfigurable power amplifier (PA) CW and modulated performance. A baseline PA is designed with a reconfigurable output matching network that includes two switches to control discrete shunt capacitors. An effective (FOM) synthesized by using resistors capacitors model states, performance evaluated as FOM swept. Increasing from 0.84 THz 2.0 results in 59.7% 74.9% improvement drain efficiency at 2.2 GHz 66.6% 68.5% change 3.5...

This work presents a power amplifier (PA) linearization approach based on baseband feedback. The modulated signal envelope is fed back from the transistor's drain to its gate with an applied amplitude and phase shift selected reduce intermodulation distortion (IMD3) product at output. design targets IMD3 improvement near PA's 1-dB compression point (P1dB), enabling linear operation higher output level therefore improved device periphery utilization efficiency. offers potential alternative...

This work presents a novel power amplifier (PA) architecture employing feedforward-like loop structure for the linearization of load-modulated PA. The load-modulating combiner (LMLC) is related to feedforward amplifier, but with interaction between main and auxiliary amplifiers generate both distortion cancellation load modulation. A brief overview underlying theory presented, followed by hardware demonstrator operating at 3.5 GHz 42-dBm peak output 55% drain efficiency in CW. When excited...

This letter presents a power-amplifier (PA)-stabilization technique based on the low-frequency out-of-band feedback. The proposed structure replaces conventional stability network to ensure unconditional at frequencies up radio-frequency (RF) operating band, with in- and above-band stabilized through matching design. approach offers an alternative inserting lossy components in RF signal path, which can significantly degrade realizable in-band gain of amplifier. 900-MHz proof-of-concept PA...

This work presents a novel approach for reducing the out-of-band distortion generated in concurrent dual-band power amplifier (PA) without penalty to output or efficiency using filter between driver and final-stage PA that manipulates such overall of cascade is minimized. The cascaded operates at 2.4-GHz 3.5-GHz with peak drain 41.6/40.4 65.2/55.1 respectively. reduces when excited by dual 10-MHz LTE-like signals 10 dB while improving average 5 percentage points.

This article presents a power amplifier (PA) linearisation approach based on synthesising negative impedance termination at the baseband frequency. Negative has been previously shown to suppress intermodulation distortion (IMD) products in amplifiers. Here, this effect is synthesised using passive feedback network between drain and gate bias paths of PA, so that IMD suppressed without an increase system complexity. The design targets IMD3 suppression PA's 3-dB compression point (P3dB),...

This paper presents a novel approach for increasing the gain of pair parallel amplifiers by introducing series connection between them on input side. The resulting structure, referred to here as enhancement PA (GEPA), has higher than each individual amplifier while maintaining output power and efficiency from combination amplifiers. An initial prototype operating at 2.03 GHz with 42.6 dBm power, 20.1 dB small signal gain, 57.1% peak PAE is reported. GEPA made up two identically performing...

In this paper we investigate the effect of amplifier input matching on noise figure, gain, and linearity design tradeoff, with goal developing a single-amplifier solution able to operate as either PA or LNA. We evaluate large-signal performance an noise-matched compared identical gain-matched input, effects efficiency figure. The prototype is designed at 3 GHz realizes 42.86 dBm CW output power 67% PAE dB gain compression. With 2 reduction in 7.7 percentage point amplifier, but improvement...