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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.


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

Show Author's information Yingdan Jiang1Zongguang Yu1( )Shutong Wu2Li Li3Xuelian Liu2
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

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), linearity, quadrature modulator, sideband suppression, carrier leakage

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Received: 26 August 2022
Revised: 21 March 2023
Accepted: 26 March 2023
Published: 04 December 2023
Issue date: June 2024

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© The Author(s) 2024.

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