2-6 GHz GaN distributed power amplifier MMIC with tapered gate-series/drain-shunt capacitors

Abstract

In this article, using a 0.25 lm GaN HEMT process, we present a 2-6 GHz GaN two-stage distributed power amplifier MMIC that utilizes tapered gate series capacitors and nonuniform drain transmission lines with tapered shunt capacitors to simultaneously obtain a linear gain enhancement and optimum load line for each transistor. By using well-derived equations to provide each transistor with the optimum load impedance and to tune the phase delay between the input and output transmission lines, the nonuniform distributed power amplifier is designed for second-stage amplification, and satisfactory performance is demonstrated. The phase balance and tapering of the gate series capacitors have a role in improving the linear gain of the two-stage amplifier. The measured data show a linear gain of 22 6 1 dB, an input/output return loss of more than 15 dB, saturated output power of 41.2-43.1 dBm under a continuous-wave mode, and a power-added efficiency of 18-22% from 2 to 6 GHz which are very competitive values compared with previous works. V C 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:456-465, 2016.

2~16 GHz GaN Nonuniform Distributed Power Amplifier MMIC

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Design of broadband high-gain GaN MMIC power amplifier based on reactive/resistive matching and feedback technique

“…Due to the gain roll-off characteristics of transistor and its input and output impedances vary with frequency, how to achieve small-scale fully integrated 1-Watt PA with more than 20% fractional bandwidth and over 22 dB small-signal gain is the major issue to be solved in this study. Discussing the current mainstream of several typical broadband configurations, distributed amplifier has the widest bandwidth by incorporating the parasitic capacitances of multiple cells in parallel into artificial transmission lines, but it generally suffers from low gain, limited power level, and bad integration [1,6,7,8].…”

Compact 20-W GaN Internally Matched Power Amplifier for 2.5 GHz to 6 GHz Jammer Systems

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