A fully integrated all-digital PLL based FM-radio Transmitter in 90 nm CMOS

A fully integrated FM-radio Transmitter (TX) is fabricated in 90 nm CMOS. It is based on an all-digital phase-locked-loop (ADPLL) and designed for co-integration in future nanoscale CMOS mobile applications. The in-band synthesizer phase noise is measured below -85 dBc/Hz for the loop bandwidth of 110 kHz. The 0.25 mm² chip consumes 12.4 mW using a 1 V supply and provides 87 MHz to 108 MHz output frequency.