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Open Access

A High-Linear Radio Frequency Quadrature Modulator with Improved Sideband Suppression and Carrier Leakage Performance

School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China, and also with The 58th Research Institute of China Electronic Technology Group Corporation, Wuxi 214072, China
The 58th Research Institute of China Electronic Technology Group Corporation, Wuxi 214072, China
School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
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Abstract

The quadrature modulator is a crucial block in transmitters that upconverts baseband signals to the Radio Frequency (RF) band of interest using local oscillator frequencies. In this paper, non-ideal factors that influence the performance of the quadrature modulator are considered, and solutions are accordingly taken in the quadrature modulator design. A high-linear RF quadrature modulator with improved sideband suppression and carrier leakage performance is presented in this work. The quadrature modulator implemented in the 0.18-μm SiGe process uses the current bleeding technique to improve the general performance of the double-balanced active Gilbert mixers. An on-chip prescaler followed by two cascaded limiting amplifiers is designed to provide accurate quadrature local oscillator signals. Predrivers at quadrature baseband signal input ports are proposed to eliminate DC offsets. The measured sideband suppression achieves a performance of better than −43 dBc and carrier leakage is less than −38 dBm over the output RF frequency range of 30 MHz to 2.15 GHz. The output 1 dB compression point equals 11.4 dBm at 800 MHz.

Keywords

Radio Frequency (RF)quadrature modulatorsideband suppressioncarrier leakagelinearity

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Tsinghua Science and Technology
Volume 29 Issue 3,
June 2024
Pages 635-643
DOI: 10.26599/TST.2023.9010024
Cite this article:
Jiang Y, Yu Z, Wu S, et al. A High-Linear Radio Frequency Quadrature Modulator with Improved Sideband Suppression and Carrier Leakage Performance. Tsinghua Science and Technology, 2024, 29(3): 635-643. https://doi.org/10.26599/TST.2023.9010024

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Received: 26 August 2022
Revised: 21 March 2023
Accepted: 26 March 2023
Published: 04 December 2023
© The Author(s) 2024.

The articles published in this open access journal are distributed under the terms of theCreative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).
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