An Ultra-Broad-Band Bridge-Type MMIC Switch Operating up to Millimeter-Wave Bands

概要

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A novel ultra-broad-band bridge-type switch is proposed, which employs a bridge circuit consisting of four common-gate FETs. The isolation of conventional series- and shunt-type switches is limited by the switching device's performance, namely, the ON resistance (R_<on>) and the OFF capacitance (C_<off>). Some methods have been proposed to overcome this problem. However, most of them are band-limited. A feature of the newly-developed bridge-type switch is that its isolation characteristics do not depend on the R_<on> and C_<off> of the switching devices, but instead on the accuracy of the balancing bridge circuit, and thus ultra-broad-band characteristics can be obtained. The isolation for deviation of the bridge circuit elements and ON-state characteristics are calculated using a simple FET model. The fabricated bridge-type MMIC switch achieves less than 3.0dB insertion loss and greater than 28dB isolation in the broad frequency band up to 40GHz.
社団法人電子情報通信学会の論文
2003-02-01