A Comparison of All-Digital Transmitter Architectures for Cellular Handsets

Hamidović, Damir; Markovic, J.; Preyler, Peter; Mayer, Christian; Huemer, Mario; Springer, Andreas

doi:10.1109/austrochip.2019.00015

Cited by 5 publications

(4 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The article A multi-standard analog front-end circuit for 13.56 MHz RFID reader [17] presents a transmitter in polar architecture [18], which allows ASK modulation. The pre-sented transmitter consists of a dual p-stage D-class amplifier without a pre-driver.…”

Section: Multistandard Polar Transmitter With D-class Amplifiermentioning

confidence: 99%

“…The article Design of 13.56 MHz ASK transmitter for near field communication using a DLL architecture [21] presents an NFC outphasing PWM [18] transmitter based on a DLL structure. Outphasing is a method of modulation where two transmitted carrier signals' phase relationship is changed in order to create amplitude and phase modulation.…”

Section: Multistandard Pulse Width Modulated (Pwm) Transmitter Based ...mentioning

confidence: 99%

See 1 more Smart Citation

Design of Multi Standard Near Field Communication Outphasing Transmitter with Modulation Wave Shaping

Korošak¹,

Suhadolnik²,

Pleteršek

2021

Electronics

View full text Add to dashboard Cite

The aim of this work is to tackle the problem of modulation wave shaping in the field of near field communication (NFC) radio frequency identification (RFID). For this purpose, a high-efficiency transmitter circuit was developed to comply with the strict requirements of the newest EMVCo and NFC Forum specifications for pulse shapes. The proposed circuit uses an outphasing modulator that is based on a digital-to-time converter (DTC). The DTC based outphasing modulator supports amplitude shift keying (ASK) modulation, operates at four times the 13.56 MHz carrier frequency and is made fully differential in order to remove the parasitic phase modulation components. The accompanying transmitter logic includes lookup tables with programmable modulation pulse wave shapes. The modulator solution uses a 64-cell tapped current controlled fully differential delay locked loop (DLL), which produces a 360° delay at 54.24 MHz, and a glitch-free multiplexor to select the individual taps. The outphased output from the modulator is mixed to create an RF pulse width modulated (PWM) output, which drives the antenna. Additionally, this implementation is fully compatible with D-class amplifiers enabling high efficiency. A test circuit of the proposed differential multi-standard reader’s transmitter was simulated in 40 nm CMOS technology. Stricter pulse shape requirements were easily satisfied, while achieving an output linearity of 0.2 bits and maximum power consumption under 7.5 mW.

show abstract

Section: Multistandard Polar Transmitter With D-class Amplifiermentioning

confidence: 99%

Section: Multistandard Pulse Width Modulated (Pwm) Transmitter Based ...mentioning

confidence: 99%

Design of Multi Standard Near Field Communication Outphasing Transmitter with Modulation Wave Shaping

Korošak¹,

Suhadolnik²,

Pleteršek

2021

Electronics

View full text Add to dashboard Cite

show abstract

“…The Fourier transform of (10) by neglecting the constant phase shift 1/4( f BB + f c ) follows to (11) shows that the spectrum of the output signal consists of a series of tones which are separated by…”

Section: Principle Limitations Of Digital Polar Transmittersmentioning

confidence: 99%

“…Those architectures achieve better results in terms of power consumption, voltage and temperature variations or power added efficiency (PAE), compared to mostly analog architectures [2]. In the last years different RF transmitter architectures have been published like all-digital-quadrature (IQ) [2]- [7], digital-polarbased [8], [9], multiphase [10], [11], outphasing [12]- [16] or hybrid IQ-polar architectures [17]. The application of digital switching for millimeter waves (mmWave) frequencies is challenging and implementations are not yet shown.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Spectral Degradation and Error Compensation in 5G NR Digital Polar Transmitters

Preissl

Preyler

Mayer

et al. 2020

IEEE Trans. Circuits Syst. I

View full text Add to dashboard Cite

Cellular standards evolve to support increasingly higher bandwidths which results in strict in-and out-of-band requirements such as lower error vector magnitude (EVM) and/or adjacent channel leakage ratio (ACLR). Digital polar transmitters, which are showing the best performance in terms of power consumption, are challenged to fulfill these requirements. This work will show that even in case of ideal analog components and infinite digital resources, there are principle limitations in terms of out-of-band noise for digital polar transmitters. A typical polar modulation will be compared to a theoretical signal with continuous amplitude modulation. The analysis of the resulting error signal suggests a decomposition into two components which can be partially compensated in the amplitude and phase modulation paths. Based on that decomposition a compensation algorithm has been developed and evaluated with a 400 MHz 5G New Radio (NR) signal for Band n257 on Frequency Range 2 with carrier frequency of 26.5 GHz. The compensation results in an out-of-band noise reduction of 44 dB close to the carrier frequency. Furthermore, EVM improvements for NR signals are demonstrated.

show abstract