A Wideband Injection-Locked Frequency Tripler

1. Guangdong Provincial Key Laboratory of Millimeter-Wave and Terahertz, the School of Electronic and Information Engineering, South China University of Technology, Guangzhou, 510641, China;2. Intelligent Sensing and Wireless Transmission Center, Pazhou Laboratory, Guangzhou, 510330, China.

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Guangdong Important Fields Research Program (2018B010115001); National Key R&D Program of China (2018YFB1802000); Guangdong Innovative and Entrepreneurial Research Team Program (No. 2017ZT07X032)

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    A wideband injection-locked frequency tripler (ILFT) is proposed. Based on the conventional injection method, the tripler used a push-push differential pair to double the frequency of the input signal and coupled the generated second harmonic to the source common mode node of the injectors through a transformer, which enhanced the second harmonic at the source common mode node of the injectors. Since the injection current is generated by mixing the injected signal with the second harmonic at the source common mode node, the injection current is also enhanced, thereby increasing the locking range. In addition, the tripler adopted a fourth-order resonator, as a result, the phase of the resonant impedance is flattened at the zero-crossing point, then the locking range is further increased. The tripler is implemented in a standard CMOS 65nm process with a chip area of 720×670 um2, and the power consumption is 15.2 mW under a 1.2-V power supply. With 0 dBm power injection, the locking range is 19.2-27.6 GHz, and the corresponding fundamental suppression ratio is greater than 25 dB, and the second harmonic counterpart is beyond 35 dB. The proposed ILFT is capable of the requirements of the oscillation source in the 5G transceiver.

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  • Received:August 20,2021
  • Revised:October 26,2021
  • Adopted:October 29,2021
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