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This paper presents an F band injection locked frequency tripler (ILFT). The ILFT is based on transformer coupling into the resonator of differential Colpitts oscillator. The locking range of the Tripler is between 90 to 115 GHz thus achieving 24.5% locking range. Transformers are used to couple the signals in and out of the ILFT, without additional power consuming buffers. The ILFT was implemented in 90 nm CMOS process, with a maximum power consumption of the circuit is 17 mW and area of 0.284 mm2 including bond pads.