Understanding linearity range of 1GHz-VCO with 1.8V LDO

Voltage Control Oscillator (VCO) is an integral part of many electronic applications like PLL, clock generation in microprocessors & carrier synthesis in cellular telephones etc. Such applications require different topologies which gives robust high performance. Consequently, VCO design in CMOS technology continues to pose interesting challenges. This paper presents the design of Voltage Control Ring Oscillator with the oscillation frequency up to 1.05 GHz. The