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A 4×4 switch IC using cold-FETs connected in series can be used as a single-ended 4×4 switch, an add drop multiplexer, or a differential 2×2 switch. An InP HEMT with a low Ron·Coff product enables us to configure a dc-to-over-10-GHz switch without using a shunt FET, which offers a logic-level-independent interface. A packaged IC achieves error-free operation up to 12.5 Gbit/s with either negative (VH = 0 V, VL = -0.9 V) or positive (VH = +13 V, VL = +0.7 V) logic-level input for all 16 possible states. The power consumption is less than 5 mW. The add drop multiplexing operation with an ultra-fast switching of ∼160 ps is also successfully demonstrated.