EER power amplifier modulator efficiency improvement using PWM with additional sigma-delta modulation

Bolotov, A. O.; Kholyukov, R. G.; Varlamov, O. V.

doi:10.1109/synchroinfo.2018.8456955

Cited by 28 publications

(3 citation statements)

References 2 publications

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“…This being a major drawback for non-constant envelope modulations, the efficiency enhancement in back-off has been addressed resorting to various techniques. These belong to two main categories, namely those based on supply modulation, such as envelope elimination restoration [12,13] and envelope tracking [14][15][16], and those exploiting load modulation [17]. The Doherty architecture [18][19][20], the Chireix outphasing [21][22][23], and the Load Modulated Power Amplifier (LMBA) [24,25] belong to the latter category.…”

Section: Introductionmentioning

confidence: 99%

Broadband Class-J GaN Doherty Power Amplifier

et al. 2022

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This paper presents a broadband 3 GHz–3.7 GHz class-J Doherty power amplifier exploiting second harmonic tuning in the output network. Furthermore, the output impedance inverter is eliminated and its effect is embedded in the main device’s output matching network, thus trading off among bandwidth, efficiency, and gain. The proposed amplifier adopts two 10 W packaged GaN transistors, and it achieves in measurement 60–74%, and 46–50% drain efficiency at saturation and 6 dB output back-off, respectively, with a saturated output power of 43 dBm–44.2 dBm and a small-signal gain of 10 dB–13 dB. The proposed DPA exhibits a simulated adjacent channel power ratio less than −30 dBc at 36 dBm average output power, when a 16-QAM modulation with 5 MHz bandwidth is applied to the 3.5 GHz carrier.

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Section: Introductionmentioning

confidence: 99%

Broadband Class-J GaN Doherty Power Amplifier

et al. 2022

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“…The main limiting factor in the use of PWM amplifiers in amplifying the envelope of modern telecommunications and television and radio broadcasting signals is technological limitations on the element base speed, which, as a rule, decreases with an increase in the switched power. The use of multiphase PWM [ 9 ] and additional sigma-delta modulation [ 10 ] allows to slightly expand the boundaries of the PWM amplifier application areas. However, fundamental limits on switching speed remain.…”

Section: Introductionmentioning

confidence: 99%

Broadband and Efficient Envelope Amplifier for Envelope Elimination and Restoration/Envelope Tracking Higher-Efficiency Power Amplifiers

Varlamov

Nguyen

Grebennikov³

2022

Sensors

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Increasing the efficiency of transmitters, as the largest consumers of energy, is relevant for any wireless communication devices. For higher efficiency, a number of methods are used, including envelope tracking and envelope elimination and restoration. Increasing the bandwidth of used frequencies requires expanding envelope modulators bandwidth up to 250–500 MHz or more. The possibility of using amplifiers with input signal quantization (AISQ), as an alternative to the most common hybrid envelope tracking modulators, is considered. An approach has been developed for optimizing AISQ characteristics according to the criterion of minimum loss when amplifying modern telecommunication signals with Rayleigh envelope distribution. The optimal quantization levels are determined and the energy characteristics of AISQ are calculated. AISQ loss power is shown to decrease by 1.66 times with two-level quantization, by 2.4 times with three-level quantization, and by a factor of 3.0–3.7 for four–five quantization levels compared to a class B amplifier. With these parameters, AISQ becomes competitive with respect to hybrid envelope tracking modulators but does not have electromagnetic interference from the pulse width modulation (PWM) path.

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“…In order to increase back-off efficiency, various techniques have been proposed, both at the PA and at the system level, such as the Doherty power amplifier [13,15] and the Chireix outphasing [16,17] PA, based on the load modulation concept [18], or Envelope Elimination and Restoration (EER) [19,20] and Envelope Tracking (ET) [21,22] techniques, based instead on supply modulation. A combination of both supply and load modulation can be also exploited to maximize the achievable back-off efficiency [23,24].…”

Section: Introductionmentioning

confidence: 99%

Design of a Wideband Doherty Power Amplifier with High Efficiency for 5G Application

et al. 2021

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This paper discusses the design of a wideband class AB-C Doherty power amplifier suitable for 5G applications. Theoretical analysis of the output matching network is presented, focusing on the impact of the non-ideally infinite output impedance of the auxiliary amplifier in back off, due to the device’s parasitic elements. By properly accounting for this effect, the designed output matching network was able to follow the desired impedance trajectories across the 2.8 GHz to 3.6 GHz range (fractional bandwidth = 25%), with a good trade-off between efficiency and bandwidth. The Doherty power amplifier was designed with two 10 W packaged GaN HEMTs. The measurement results showed that it provided 43 dBm to 44.2 dBm saturated output power and 8 dB to 13.5 dB linear power gain over the entire band. The achieved drain efficiency was between 62% and 76.5% at saturation and between 44% and 56% at 6 dB of output power back-off.

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EER power amplifier modulator efficiency improvement using PWM with additional sigma-delta modulation

Cited by 28 publications

References 2 publications

Broadband Class-J GaN Doherty Power Amplifier

Broadband Class-J GaN Doherty Power Amplifier

Broadband and Efficient Envelope Amplifier for Envelope Elimination and Restoration/Envelope Tracking Higher-Efficiency Power Amplifiers

Design of a Wideband Doherty Power Amplifier with High Efficiency for 5G Application

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