Multiphase PWM characteristics in the EER transmitter envelope path

Varlamov, O. V.

doi:10.1109/emctech53459.2021.9619166

Cited by 27 publications

(3 citation statements)

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“…Powerful broadband DC amplifiers are currently used in the modulation paths of both AM and SSB EER radio transmitters. The most common among such devices are pulse-width modulation (PWM) amplifiers [ 9 ]. A PWM amplifier generally consists of a pulse-width-modulated square wave generator, a switching amplifier, and an output low-pass filter (LPF) [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…The most common among such devices are pulse-width modulation (PWM) amplifiers [ 9 ]. A PWM amplifier generally consists of a pulse-width-modulated square wave generator, a switching amplifier, and an output low-pass filter (LPF) [ 9 ]. The use of the switching operating mode of the active elements provides high efficiency, little dependent on the amplitude of the amplified signal.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%