Time-Interleaved Delta-Sigma Modulator for Wideband Digital GHZ Transmitters Design and SDR Applications

Ebrahimi, Mohammad Mojtaba; Helaoui, Mohamed; Ghannouchi, Fadhel M.

doi:10.2528/pierb11071205

Cited by 34 publications

(18 citation statements)

References 25 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The baseband signal is processed using a pulse modulator, with delta-sigma modulation (DSM) or pulse width modulation (PWM) , and a digital up-conversion conversion stage that modulates the binary signal with a square wave at RF. More recent advances to these architectures were made to improve the DSM noise shaping characteristics using parallel architectures in [7] and [8], and to allow multimode and multichannel transmission in [9] improving ADT's flexibility.…”

Section: All -Digital Transmitte Rs State Of the Artmentioning

confidence: 99%

See 1 more Smart Citation

All-digital transmitter with RoF remote radio head

Cordeiro

Oliveira

Vieira

2014

2014 IEEE MTT-S International Microwave Symposium (IMS2014)

View full text Add to dashboard Cite

This paper presents a new radio-over-fiber system that uses an all-digital transmitter architecture enabling a very simple remote radio head comprised only by an amplifying stage, a bandpass filter and an antenna . An all-digital transmitter is proposed to implement a flexible centralized digital radio, able to perform the baseband processing and transmission of radio signals at radio frequencies (RF) over an optical fiber. The digital signal at RF is transmitted over fiber using a simple on off digital modulation, reducing the limitations of conventional analog radio-over-fiber systems, but maintaining the advantages of a reduced complexity transmitter radio head .Index Terms-All-Digital Transmitter, Digital Radio-over Fiber, RF-over-Fiber.

show abstract

Section: All -Digital Transmitte Rs State Of the Artmentioning

confidence: 99%

“…The transmitter architecture (Fig. 1) uses a Time-Interleaved Delta Sigma approach that achieves higher equivalent frequency for the delta-sigma modulator by paraUelizing its outputs [7].…”

Section: A Adt Central Stationmentioning

confidence: 99%

All-digital transmitter with RoF remote radio head

Cordeiro

Oliveira

Vieira

2014

2014 IEEE MTT-S International Microwave Symposium (IMS2014)

View full text Add to dashboard Cite

show abstract

“…Next, the node equations method has been applied for different number of channels to known architectures of errorfeedback DSMs, such as Cascade-of-integrators feedback form (CIFB) [3], Cascade-of-integrators feedforward form (CIFF) [9], Cascade-of-resonators feedback form (CRFB) [10], Cascade-of-resonators feedforward form (CRFF) [11].…”

Section: Critical Path Analysismentioning

confidence: 99%

“…The critical path of the 4 architectures for 2 nd order with 2 channels is analyzed and estimated in Table II. It can be seen that the critical path of the CIFB architecture is almost half of the next best one, CIFF and almost a third of the poly-phase CRFB implementation in [10]. Hence, the study has been extended in Table III to a 3 rd order CIFB architecture with up to 8 channels time-interleaving.…”

Section: Critical Path Analysismentioning

confidence: 99%

Considerations for high-speed configurable-bandwidth time-interleaved digital delta-sigma modulators and synthesis in 28 nm UTBB FDSOI

Marin

Frappé

Cathelin

2015

2015 IEEE 13th International New Circuits and Systems Conference (NEWCAS)

View full text Add to dashboard Cite

This paper presents the design and simulation of a time-interleaved delta-sigma modulator as part of a digital transmitter chain. The architecture is chosen based on a critical path analysis in order to reach very high frequency operation. The modulator's configurability allows it to target signal bandwidths from 20 MHz up to 160 MHz with a SNR greater than 67 dB. Finally, the modulator is synthesized using standard cells in 28nm FDSOI CMOS from STMicroelectronics and simulated for different numbers of time-interleaved channels, reaching a sample rate of up to 6 GS/s. An optimum number of channels can be found based on a trade-off between operating frequency, supply voltage, power consumption and area.

show abstract

“…Both transmitter [30]- [52] and receiver [53]- [59] designs have been reported, and various delta-sigma modulators, including lowpass [30], [32]- [34], [36]- [39], [41]- [45], [47], [48], bandpass [31], [35], and multiband [40], [49]- [52] have been demonstrated. To relax the FPGA speed requirement, several time-interleaving or parallel processing techniques are also presented [38], [39], [43]- [45], [47], [48]. Table I and Fig.…”

mentioning

confidence: 99%

Delta-Sigma Modulation for Next Generation Fronthaul Interface

Wang

Jia

Campos

et al. 2019

J. Lightwave Technol.

View full text Add to dashboard Cite

A new function split option for the next generation fronthaul interface (NGFI) is demonstrated based on all-digital RF transmitter using bandpass delta-sigma modulation. Different from other low layer split (LLS) options, such as option 6 (MAC-PHY), 7 (high-low PHY), and 8 (CPRI), the proposed option 9 implements RF functions in the digital domain, and splits within the RF layer, with high-RF layer centralized in the distributed unit (DU) and low-RF layer distributed in remote radio units (RRUs). A proof-of-concept all-digital RF transmitter based on real-time delta-sigma modulation is implemented using a Xilinx Virtex-7 FPGA. A 5-GSa/s delta-sigma modulator is demonstrated to encode LTE/5G signals with bandwidth up to 252 MHz and modulation format up to 1024-QAM to a 5-Gb/s OOK signal, which is transmitted over 30-km single-mode fiber from DU to RRU. To relax the FPGA speed requirement, a 32-pipeline architecture is designed. Two-carrier aggregation of 5G and 14-carrier aggregation of LTE signals are demonstrated with error vector magnitude (EVM) performance satisfying the 3GPP specifications. Compared with option 8 (CPRI), although the proposed option 9 split occurs at a lower level, it offers improved spectral efficiency and reduced NGFI data rate than CPRI. Moreover, other LLS options, such as 6, 7, and 8, all require a complete RF layer implemented in the analog domain at remote cell sites; whereas option 9 realizes high-RF layer in the digital domain at DU, and eliminates the need of analog RF devices, such as DAC, local oscillator and mixer at RRU, which not only makes low-cost, energy-efficient, and small-footprint cell sites possible for the wide deployment of small cells, but also paves the road toward software defined radio (SDR) and virtualization of DU and RRU for improved compatibility and reconfigurability among multiple radio access technologies (multi-RATs). Given its centralized architecture and deterministic latency, option 9 is suitable for radio coordination applications, and has potential in low-frequency narrowband scenarios with cost, power, and/or size sensitive cell sites, such as massive machine type communication (mMTC) and narrowband internet of things (NB-IoT). Index Terms-All-digital RF transmitter, delta-sigma modulation, fronthaul, NGFI, software defined radio. I. INTRODUCTION T HE emerging video-intensive and bandwidth-consuming services, e.g., virtual reality, augmented reality, immersive applications, are driving the explosive growth of mobile data traffic [1]-[3], making radio access networks (RAN) become

show abstract

Time-Interleaved Delta-Sigma Modulator for Wideband Digital GHZ Transmitters Design and SDR Applications

Cited by 34 publications

References 25 publications

All-digital transmitter with RoF remote radio head

All-digital transmitter with RoF remote radio head

Considerations for high-speed configurable-bandwidth time-interleaved digital delta-sigma modulators and synthesis in 28 nm UTBB FDSOI

Delta-Sigma Modulation for Next Generation Fronthaul Interface

Contact Info

Product

Resources

About