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2至14 GHz的匹配微波混频器解决困难的设计挑战
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2017-05-11
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2至14 GHz的匹配微波混频器解决困难的设计挑战
一个新的非常宽带混频器与集成LO（本地振荡器）缓冲区和倍频器解决了一些具有挑战性的问题，微波设计师。从线性技术的ltc5548混合器简化设计以下主要特点：
中频（中频）端口，从DC延伸到6 GHz，简化宽带中频采样
片上LO限制放大器消除了外部LO缓冲阶段，降低成本和减少总解决方案的大小相比，混合模块解决方案
0 dBm的LO驱动器减少总辐射泄漏，减少外部过滤器和屏蔽要求
超宽带射频（2至13.6 GHz）和LO（1至12 GHz）端口不断匹配
该器件具有宽带差分端口，如果从DC工作到6千兆赫。它的低频能力使得更灵活的频率规划。是理想的ltc5548接收宽带信号，特别是与500 MHz带宽1 GHz或更高。
Unlike most microwave mixers， which typically require a hefty +13 dBm or higher LO drive， the LTC5548 has an integrated LO buffer and only requires 0 dBm drive. Since the device starts with a 0 dBm signal， rather than the +13 dBm or higher typical with alternative devices， the LO leakage present at other ports is 13 dB lower. This results in much simpler filtering requirements， especially with the low IF frequencies the LTC5548 can support. The on-chip LO buffer significantly improves the RF to LO port isolation， which helps reduce any issues with frequency pulling of the synthesizer source due to a parasitic RF signal at the LO input.
The LTC5548 is designed for wideband operation and can be used bidirectionally， either as an up-conversion or down-conversion mixer. Its RF port can be the input in a down-converting receiver or the output in an up-converting transmitter. Its RF port has an on-chip balun， enabling it to operate single-ended. The balun transformer is matched to 50 Ω continuously from 2 to 13.6 GHz， with better than 10 dB return loss.
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