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In this paper, a design architecture of a compact, concurrent quadband Doherty Power Amplifier (DPA) is proposed that relies on a new quadband band-pass filter comprising the input matching network. The filter — based on Quarter Wave Open Stubs (QWOS) at the desired operation frequencies — is embedded within the output arms of a wideband power divider to create the targeted four arbitrary frequencies...
In this paper, a wideband Doherty power amplifier along with a novel design strategy for peaking output matching network is presented. The proposed matching network is designed by maintaining a predetermined electrical length to eliminate the using of peaking offset line for expanding the bandwidth effectively and improving the back-off efficiency. For higher than 50% efficiency at 6 dB back-off power,...
In this paper we present a novel approach to the design of output combiners for Doherty PA (DPA). It is based on the compensated transmission line equivalence principle, applied to both the impedance inverter and the peak amplifier matching network considered as a whole. This technique is applied to the design of a Silicon Laterally Diffused MOS (LDMOS) DPA with optimized peak power and efficiency...
The design, realization and test of a tri-band concurrent Doherty power amplifier (DPA) is presented. The prototype has been realized in hybrid technology using GaN HEMT devices. The operating bands have been selected around the following carrier frequencies f1 = 1.84GHz, f2 = 2.14GHz and f3 = 2.65GHz corresponding to LTE, UMTS and WiMax applications, respectively. The prototype has been tested and...
This paper describes a compact two-stage pseudodifferential cascode power amplifier implemented in 7-metal-layer 65nm Low-Power CMOS process. A cascode topology is associated with wideband matching networks which combine integrated transformers and slow-wave transmission lines. The power amplifier achieves 26GHz of bandwidth from 48GHz to 74GHz, with a 1dB ripple flat gain between 50GHz and 70GHz...
This paper presents the design and nonlinear analysis of a mm-wave wideband Doherty power amplifier at 22 to 29GHz with 7GHz bandwidth, the design is done using 0.15μm GaAs PHEMT transistor to support a variety of mm-wave applications including point to point digital radio, LMDS/LMCS, ka-band satellite spacecraft and ISM applications. The wideband Doherty power amplifier provides greater than 21dBm...
A new methodology is presented for designing baluns exhibiting multi-decade bandwidths at microwave frequencies. Simulations show that resistors terminating the outer transmission line suppress the half-wavelength resonance and greatly extend the bandwidth. Using linear measurements at microwave frequencies, ferrite beads have been shown to behave as resistors with a small reactance, suitable for...
This paper proposes a new circuit model for E-shaped patch antennas using the multi-conductor transmission line mode theory. First, the current modes generated on the E-shaped patch antenna are shown, and an equivalent circuit is derived from the transmission line mode theory. The equivalent circuit is analyzed in detail to obtain wideband characteristics. Then, the theoretical maximum bandwidth is...
This paper discusses the design of wideband and multiband power amplifiers suitable for software defined radios of emerging ubiquitous and cognitive networks. Different methods for wideband/multi-band matching network (MN) design are presented and advantages and disadvantages of them for power amplifier design are discussed. Example of wideband and multiband power amplifier designs are given as illustrations.
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