Noise Contributors in a 7.2 GHz Low-Power veo with Automatic Amplitude Control

In this paper, the major noise sources in a VCO with automatic amplitude control (AAC) circuit, fabricated in a commercial CMOS deep n-well ${0.18}\mu {{\rm m}}$ technology with access to the body of NMOS transistors, is described. The analysis shows that there is an optimal point where the noise due to the AAC is minima] and equal to that of a VCO with no AAC. The oscillator consumes 4.32 mW@1.8 V has a tuning range of 410 MHz and a phase noise level of −108 dBc/Hz@1 MHz from a 7.2 GHz carrier.