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This paper presents a 0.01-8-GHz 4×4 switch matrix in 0.13-μm CMOS technology. A deep n-well series-shunt-series switch is chosen as the switching core, and the transistor sizes are optimized for low insertion loss and high isolation up to 8 GHz. Full electromagnetic analysis is also performed on the switching core to result in a compact design. The 4×4 switch matrix shows a measured insertion loss of 2.0-3.3 dB and an isolation of 50-44 dB at 2-8 GHz with near-zero power consumption. The measured input P1 dB and IP3 are 8-10 and 26-30 dBm at 0.5-8 GHz. The switch matrix has very low dispersion with <; 6-ps group-delay variation and can switch a 12.5-Gb/s signal with a bit error rate of <; 10-12. The design can be used in reconfigurable 0.01-8 GHz communication systems or as a crossbar switch matrix for data routing.