Ultrawideband RF-IQ Modulator Using Segmented Nonlinearly Scaled RF-DACs and Nonoverlapping LO Signals

被引：2

作者：

Aberg, Victor ^{[1
]}

Fager, Christian ^{[2
]}

Hou, Rui ^{[3
]}

Svensson, Lars ^{[1
]}

机构：

[1] Chalmers Univ Technol, Dept Comp Sci & Engn, S-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, Dept Microtechnol & Nanosci, S-41296 Gothenburg, Sweden

[3] Ericsson, S-16480 Stockholm, Sweden

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2023年 / 71卷 / 05期

关键词：

Modulation; Jitter; Harmonic analysis; OFDM; Clocks; Wideband; Codes; CMOS; IQ modulator; nonlinear scaling; nonoverlapping local oscillator (LO); RF-digital-to-analog converter (DAC); DIGITAL PREDISTORTERS; TRANSMITTER;

D O I：

10.1109/TMTT.2023.3237713

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A wideband Cartesian in-phase and quadrature (I/Q) modulator based on dual 10 b RF-digital-to-analog converters (DACs) is presented. Nonoverlapping local oscillator (LO) signals and a segmented nonlinear scaling with scaled unit cells contribute to a high linearity and allow for a low-complexity digital predistortion (DPD). Unit-cell flip-flops (FFs) and a balanced clock distribution enable a high sample rate with little skew. Out-of-band emissions are reduced through drive-slope control of the data-switch inputs. The modulator, implemented in the 22-nm fully-depleted silicon-on-insulator (FDSOI) CMOS, operates between 20 and 26 GHz with a peak sample rate of 11 GS/s. It has been used to demonstrate the transmission of a 64-quadrature amplitude modulation (QAM) single-carrier (SC) signal at 13.2 Gb/s, a 256-QAM SC signal at 7.33 Gb/s, and an orthogonal frequency division multiplexing (OFDM) signal comprising four aggregated 400-MHz 64-QAM channels with an error vector magnitude (EVM) of 6.43%. These results demonstrate the potential of the proposed modulator for the realization of ultrawideband transmitters in high-performance millimeter-wave (mmW) systems.

引用

页码：1899 / 1910

页数：12