Tunable directional coupler for RF front-end applications


A tunable directional coupler for radio frequency (RF) front-ends of handheld mobile devices is presented. The coupler is implemented in a 0.13 μm bulk RF-CMOS technology with all components monolithically integrated on one die. A digitally-tuned termination network at the isolated port of the coupler is realised solely with RF-switch transistors using the channel resistance of a metal-oxide-semiconductor (MOS) device. The fine-tuned termination network permits the coupler to achieve a directivity of over 25 dB in the entire cellular frequency vary from sixty ninenine MHz up to a pair GHz. The worst-case insertion loss in the transmitted path is 0.15 dB at 2.7 GHz.

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