Q波段双通道幅度控制多功能芯片

A Q-band dual-channel monolithic circuit with amplitude control functions

摘要:

设计了一款Q波段的双通道多功能单片电路，其内部集成了威尔金森功分器、六位0.5 dB步进数控衰减器和单刀双掷开关。在设计过程中，开关单元电路采用三级并联结构，有效降低电路插入损耗，提高隔离度；数控衰减器单元采用多节并联T型结构，改善高频段插入损耗和衰减精确度指标。通过以上设计方法，该单片电路在40~50 GHz插入损耗为10 dB，隔离度为26 dB；能够实现幅度控制步进0.5 dB，最大衰减量31.5 dB。

Abstract:

A novel dual-channel monolithic circuit working at Q-band is reported which integrates the functions of Wilkinson power divider, digital attenuator and Single Pole Double Throw(SPDT) switch. Three-level parallel structure is adopted in the SPDT switch unit during the design process which can reduce insertion loss and improve isolation effectively. A kind of multi-section parallel-T structure is used in the digital attenuator unit for improving insertion loss and attenuation accuracy in high frequency band. By means of the above design，a monolithic circuit with 10 dB insertion loss and 26 dB isolation is produced successfully, which has the amplitude control function of 0.5 dB step to achieve 31.5 dB maximum attenuation.