High power combiner/divider design for dual band RF power amplifiers

Flattery, Kyle J.; Amin, Shoaib; Mahamat, Yaya; Eroğlu, Abdullah; Rönnow, Daniel

doi:10.1109/iceaa.2015.7297272

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Various power combination techniques have been proposed in the literature [32], [33], [34], [35], [36] which can be utilized to combine different QPSK signals in an RF-QAM transmitter. Among different methods, three main techniques are (1) transformer-based power combining as shown in Fig.…”

Section: Power Combiningmentioning

confidence: 99%

A Study of a Millimeter-Wave Transmitter Architecture Realizing QAM Directly in RF Domain

Oveisi

Wang

Heydari

2023

IEEE Trans. Circuits Syst. I

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Realization of high-order modulation schemes directly in the RF domain enables the generation of spectrally efficient 4 M quadrature-amplitude-modulated (4 M QAM) symbols using the vectorial summation of M quadrature phase-shift keying (QPSK) signals whose amplitudes are progressively scaled by a constant factor of two. Called RF-QAM, this approach leads to numerous advantages including the elimination of powerhungry digital-to-analog converter (DAC) and the mitigation of stringent linearity requirement of the front-end power amplifier (PA). This paper presents a comprehensive comparative study of RF-QAM and conventional transmitters. The design issues associated with the front end and the mixed-signal blocks for both architectures are investigated, and the performance of these two designs is compared. Various circuit-and system-level simulations verify the superior performance of the RF-QAM transmitter compared to the conventional counterpart.Index Terms-Digital-to-analog converter (DAC), power amplifier (PA), quadrature amplitude modulation (QAM), quadrature phase-shift keying (QPSK), radio frequency (RF), terahertz (THz), transmitter (TX), 6G. I. INTRODUCTIONT HE advent of emerging content-intensive applications has led to the ever-increasing demand for high-speed data transmission, and thus, the emergence of 6G and beyond where the operating frequency is designated to be in the terahertz (THz) range (loosely defined to cover frequencies from 100-to 1000-GHz) [1], [2]. Several transceiver front-ends operating at the low side of the THz band achieving impressive data rates have been reported in the literature [3], [4], [5], [6]. Recently, a number of end-to-end integrated transmitters and receivers operating above 100 GHz have been presentedAchieving high data rate by increasing the center frequency to obtain larger bandwidth (BW) comes with several essential concerns: (1) Operating above f max /2 results Manuscript

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Section: Power Combiningmentioning

confidence: 99%

A Study of a Millimeter-Wave Transmitter Architecture Realizing QAM Directly in RF Domain

Oveisi

Wang

Heydari

2023

IEEE Trans. Circuits Syst. I

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Design and fabrication of a Wilkinson power divider with harmonic suppression for LTE and GSM applications

Moloudian

Soltani

Bahrami

et al. 2023

Sci Rep

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Conventional Wilkinson power dividers (WPDs) can provide acceptable performance close to the nominal center frequency. However, these WPDs can also exhibit poor out-of-band performance while requiring a large footprint. In order to improve on the current state of the art, a modified microstrip WPD is proposed that exhibits a substantially improved stopband and high isolation. A lowpass filter (LPF) structure is utilized in both branches of the power divider to provide harmonic suppression. According to the obtained results, the input return loss (|S11|), output return loss (|S22|), output insertion loss (|S21|) and isolation (|S32|) are better than 34.2 dB, 26.2 dB, 3.52 dB and 31.2 dB, respectively. The proposed modified WPD has a wide 20 dB stopband (from 2.54 GHz to 13.48 GHz) and filters the second to seventh harmonics with attenuation levels of greater than 20 dB. The proposed WPD has a small size of 33.8 mm × 27 mm (0.42 λg × 0.33 λg), where λg is the guided wavelength at the operating frequency of 1.8 GHz. The WPD has been fabricated and tested and shows good agreement between simulated and measured results and the proposed design has desirable characteristics for LTE and GSM applications.

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