K. Tsutsumi, F. Onoma, J. Koide, M. Uesugi, N. Suematsu, H. Harada
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引用次数: 3
摘要
描述了一种低杂散SiGe-MMIC直接转换收发器，采用2fLO LO交换配置用于认知无线电。在提议的配置中，Tx和Rx块的LO信号由开关电路后面的分频器产生。通过将此配置应用于收发器，与传统配置相比，FDD模式下最大Tx杂散的偏移频率增加了一倍。理论分析表明，该结构可使本端信号杂散水平降低12 dB。通过这些影响，可以避免接收信号对接收机灵敏度的降低，并放宽对接收信号BPF特性的要求。采用0.18 μ m SiGe-BiCMOS工艺制作了采用2fLO LO开关结构的直接转换收发器MMIC。测量结果表明，在400 M-6 GHz范围内具有较高的调制精度，并且具有较低的Tx杂散特性。
A low spurious 400M–6GHz SiGe-MMIC Direct Conversion Transceiver using 2ƒLO LO switching configuration for cognitive radio
A low spurious SiGe-MMIC direct conversion transceiver using 2fLO LO switching configuration for cognitive radio is described. In the proposed configuration, LO signals for Tx and Rx blocks are generated by frequency divider behind switching circuits. By applying this configuration to the transceiver, the offset frequency of maximum Tx spurious in FDD mode is doubled compared to the conventional configuration. Also, theoretical analysis shows that the proposed configuration can lower LO signal spurious level by 12 dB. Through these effects, receiver sensitivity degradation by Tx signal can be avoided and required characteristics of Tx BPF is relaxed. The direct conversion transceiver MMIC using 2fLO LO switching configuration is fabricated in 0.18 mum SiGe-BiCMOS process. Measured results show a high modulation accuracy over 400 M-6 GHz, and low Tx spurious characteristics.
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