In this letter, a 24-GHz high-isolation ON–OFF keying (OOK) modulator with reduced input impedance variation in a 65-nm CMOS technology is proposed. A modified magnetic coupled triple-cascode configuration with a series inductor and two shunt transistors, which can simultaneously improve the ON/OFF isolation and reduce the input return loss variation between the ON- and OFF-states, is designed and analyzed for the first time. Based on this configuration, the OOK modulator achieves a 45.7-dB ON/OFF isolation and maintains better than 10-dB return loss for both the ON- and OFF-states. In addition, a data rate of 3.3 Gbps is achieved.

中文翻译：

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具有降低输入阻抗变化的 24GHz 高隔离度 CMOS 开关键控调制器

在这封信中，提出了一种 24 GHz 高隔离开关键控 (OOK) 调制器，该调制器在 65 纳米 CMOS 技术中具有降低的输入阻抗变化。首次设计和分析了一种改进的带有串联电感器和两个并联晶体管的磁耦合三重共源共栅配置，该配置可以同时提高 ON/OFF 隔离并减少 ON 和 OFF 状态之间的输入回波损耗变化. 基于此配置，OOK 调制器实现了 45.7-dB 的开/关隔离，并在开和关状态下保持优于 10-dB 的回波损耗。此外，还实现了 3.3 Gbps 的数据速率。