A wide-band 20W LMOS Doherty power amplifier

Qureshi, Jawad; Li, N.; Neo, W.C. E.; Rijs, F. van; Blednov, I.; Vreede, L.C.N. de

doi:10.1109/mwsym.2010.5517561

Cited by 42 publications

(32 citation statements)

References 7 publications

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“…The percentage bandwidth of this DPA is 58.06% which is higher than that of the class AB power amplifier and higher than Doherty power amplifiers previously designed such as in [13], [15], and [17].…”

mentioning

confidence: 73%

“…Although significant improvements in bandwidth have been reported recently [13]- [17], the DPA is still fundamentally bandwidth limited by the quarter wave impedance inverter needed to obtain proper load modulation. This results in substantial frequency dependence at the back-off power region where the Power Amplifier (PA) is operating most of the time, and thereby narrow band performance for realistic signals.…”

Section: Introductionmentioning

confidence: 99%

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A High Efficiency Doherty Power Amplifier for TV Band Applications

Abou-Shahine¹,

Nasser²,

Kabalan³

2015

JEMAA

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This paper presents a high efficiency Doherty power amplifier suitable for TV band applications. A class AB power amplifier is firstly implemented using a commercial GaN HEMT from Cree Incorporation, achieving a high power-added-efficiency of 77.78% and a 40.593 dBm output power with an associated gain of 21.65 dB. The Doherty amplifier has then been designed following the previous class AB scheme for the main amplifier and a class C scheme for the peak one. This amplifier attained a high power-added-efficiency of 81.94%, a 42.77 dBm output power, an associated gain of 21.32 dB, and an operating frequency bandwidth between 550 and 1000 MHz (58.06% fractional bandwidth) which made it suitable for TV band applications.

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mentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

A High Efficiency Doherty Power Amplifier for TV Band Applications

Abou-Shahine¹,

Nasser²,

Kabalan³

2015

JEMAA

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“…An effective method to reduce the limiting effect of the devices' output capacitances is to account for them within the combining network [76]. This approach has the main advantage of minimizing circuit size, with noticeable bandwidth enhancements [27,46,58].…”

Section: Bandwidthmentioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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Abstract:Modern mobile communication signals require power amplifiers able to maintain very high efficiency in a wide range of output power levels, which is a major issue for classical power amplifier architectures. Following the load-modulation approach, efficiency enhancement is achieved by dynamically changing the amplifier load impedance as a function of the input power. In this paper, a review of the widely-adopted Doherty power amplifier and of the other load-modulation efficiency enhancement techniques is presented. The main theoretical aspects behind each method are introduced, and the most relevant practical implementations available in recent literature are reported and discussed.

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“…From this schematic one can conclude that in the classical symmetrical two-way DPA [3], at full power no impedance transformation takes place within amplifier (all devices are loaded with Z o , with Z o equal to the characteristic impedance of the impedance inverting /4 line). Consequently, there is no bandwidth limitation at peak power for both efficiency as well as delivered output power [4]. In power back-off operation, however, due to the frequency dependent impedance inversion, bandwidth constraints play a role.…”

Section: A Two-way Doherty Amplifiersmentioning

confidence: 99%

“…We mention individual control of the DPA input signals, which was first used to achieve high efficiency vs. power back-off in three-way DPAs [5] [6] and later also in favour of extending the bandwidth [4] [9]. In [4] it was shown for a symmetrical DPA that absorbing the device capacitances in the output combiner significantly extents the achievable bandwidth and allows approximation of the theoretical bandwidth limits. When comparing asymmetric two-way DPAs and novel three-way DPAs for the same power range and frequency, the novel three-way DPA provides a much lower variation in efficiency and gain vs. frequency (Fig.…”

Section: Performance Comparisonmentioning

confidence: 99%