Suppression of 1/f noise upconversion in LC-tuned oscillators

The effect of transconductor even-order nonlinearity in combination with the tank common-mode impedance on the upconversion of 1/f noise in LC-tuned oscillators is investigated. It is demonstrated that by suitably designing the imaginary part of the tank common-mode impedance, the transconductor 1/f noise upconversion is suppressed. The presented analysis is verified by simulation results, and practical implementation issues are considered.