Abstract
CMOS RF switches support watt-level RF output power while enabling signal processing with high speed. Typically, RF FET switches offer a tradeoff between a power handling and modulation bandwidth. This paper investigates the cause of compression in a FET switch, and the analysis suggests the optimization of the gate driving impedance for a stacked-FET switch. A design methodology is presented to realize watt-level power handling with high fractional bandwidth (FBW). The measurements demonstrate a BPSK modulator that can handle up to 10 W with wide FBW. The high-power, low-insertion loss, and high-modulation bandwidth demonstrate record performance.
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