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This paper presents a new topology for a triband Doherty power amplifier (DPA). It utilizes a triband impedance inverter, realized using a T-network, to synthesize a triband power combining network. This approach enables Doherty load modulation around three separate operating frequencies with suitable fractional bandwidths. For proof of concept, a demonstration DPA operating at 1200, 1800, and 2700...
In this paper, a miniaturized, ultra-wideband, dual-section, two-way offset power divider, covering the frequency range from 0.6 to 6 GHz, with reflection cancellation and enhanced isolation, is presented. The divider small form factor is achieved through the use of a π-structure that replaces the λ/4 transmission lines in each of the divider's sections. The dimensions of the open stubs forming this...
In this paper, a new measure that accounts for the nonlinearity of radio frequency power amplifiers RFPAs is defined. The new measure — referred to herein as the Desensitization Point — is used to characterize the nonlinear behaviour of RFPAs when two in-band unequal tones are applied to the amplifier input; a strong (blocker) signal features more amplifier gain as opposed to a weak nearby signal,...
This paper presents a design for a highly-linear power amplifier — based on GaN HEMT- with an output power of more than 10W, and an ultra-broadband bandwidth extending from 0.8 to 4.2 GHz (136%). Different design techniques are adopted to achieve a flat power gain of 10 ± 1.5 dB over the entire operating bandwidth. Eighth order low pass filter matching circuits are designed for input and output matching...
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