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GaInP/GaAs HBT Sub-Harmonic Gilbert Mixers Using Stacked-LO and Leveled-LO Topologies

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4 Author(s)
Tzung-Han Wu ; Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu ; Sheng-Che Tseng ; Meng, C.-C. ; Guo-Wei Huang

This paper discusses and demonstrates the most popular sub-harmonic Gilbert mixers in 2-mum GaInP/GaAs HBT technology. High two local oscillators (2LO)-to-RF isolation is important to alleviate the self-mixing problem of the sub-harmonic mixer. The demonstrated GaInP/GaAs HBT stacked-local oscillator (LO) mixer topology has achieved the best 2LO-to-RF isolation when compared with the previous literature. On the other hand, the leveled-LO sub-harmonic mixers have advantages in terms of the high speed and low dc supply voltage at the cost of much larger LO pumping power. Among all the structures, the bottom-LO sub-harmonic mixer has the lowest current consumption and the simplest circuit structure at the expense of the 2LO-to-RF isolation

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:55 ,  Issue: 5 )