A 1.2 μm CMOS implementation of a low-power 900-MHz mobile radio frequency synthesizer

A single-chip, low-power all CMOS PLL frequency synthesizer for digital mobile radio communication systems is presented. The design of PLL components: VCO, dual-modulus prescaler and phase-frequency detector are discussed. Novel circuit techniques and design methodology allow GHz frequency range operation, and result in good phase noise performance. The measured results of a monolithic 1.2 μm CMOS PLL implementation indicate a frequency range of 800 to 900 MHz with -94 dBc/Hz phase noise at a 1 MHz carrier offset, and a power consumption of 18 mW at 5 volts