Design of broadband high-efficiency power amplifier based on elliptic low-pass and band-pass matching network

Abstract

A novel approach is proposed for the design of broadband and high-efficiency power amplifier (PA), with elliptic low-pass and band-pass filtering matching networks in this letter. Based on the equivalent circuit model of the GaN HEMT, the optimal topology of output matching network (MN) is designed as elliptic low-pass matching network with two attenuation poles, and the input MN is designed as band-pass matching network in the distributed form. A series of design procedure of the proposed topology is presented in detail. In this design, a 10-W GaN HEMT device (CGH40010F) was used. Results of measurement show that a broadband high-efficiency PA is realized from 1.45 to 2.55 GHz (fractional bandwidth = 55%) with measured drain efficiency of 70%-84% and output power of 40.4-42.4 dBm.

Design of broadband power amplifier based on loop-shaped filter matching structure

“…Table 1 compares the current work and some related PA designs at home and abroad in recent years. It can be seen from Table 1 that although [23] and [24] have higher efficiency, their bandwidths are narrower. The new loop-shaped filter structure in this paper is better in the broader frequency band achieved with higher output power and saturated efficiency.…”

“…In order to simplify the circuit design and expand the bandwidth of PA, researchers turned their attention to the filter structure. They adopted matching circuit schemes with different filter structures, such as low-pass filter structures [16,17,18], band-pass filter structures [19,20,21], ellipse filter structures [22,23,24] , and so on. Combining class-F PAs and filter structures can achieve high efficiency and broadband simultaneously.…”

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

“…The output capability of PA depends to a large extent on output MN, we started by determining the optimal complex impedance domain in the range of 22-28 GHz to ensure that PA's performance at 27 GHz still fully meets the specifications even in the worst case. Iterative load/source-pull procedures of the stabilized GaN HEMT with an input power about P1dB were carried out at low, medium, and high fundamental frequency points, whereas the influence of harmonics was ignored as they locate away from the passband and can be easily filtered out [3,27,28]. From Fig.…”

A Broadband Power Amplifier Based on a Novel Filter Matching Network

“…Although some valuable advances have been obtained in existing research [7][8][9][10][11], the design of broadband PAs is often constrained by drastic changes in impedance values and misfits between fixed matching networks [12]. In this paper, we design a broadband PA, using filter matching networks with large impedance variation space.…”