PLL based BFSK subcarrier generator for FM-UWB transmitter

This paper presents the implementation, the layout and the post-layout simulation of two main blocks of the FM-UWB transmitter; the voltage-controlled oscillator (VCO) and the subcarrier generator. A low power and linear ring VCO is proposed to generate the RF signal. A low power PLL based BFSK subcarrier generator is introduced. It includes a linear relaxation oscillator to produce the subcarrier signal. The circuits are implemented in 130nm CMOS technology. The data rate is 500kbps. Post-layout simulations show that the PLL consumes only 306μW while the VCO consumes 300μW from a 1.2V supply. The area of the PLL is 0.0124mm2.

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