Transistor Lc Oscillators for Wireless Applications : Theory and Design Aspects , Part

of any wireless communications system. Due to their low cost, design simplicity and ease in practical implementation, for example, MOSFET-based oscillators are widely used in modern wireless handset applications. This three-part tutorial highlights the basics of the oscillator circuit design, setting the relationships between the start-up and steadystate operating modes and the device equivalent circuit parameters. The basic DC and RF device operation regions are explained and analyzed in Part I. It is very important for the oscillator noise model to express a clear relationship between the oscillator spectral noise power density and resonant circuit, and active device parameters. Several approaches, including the simple linear Leeson feedback oscillator model, the linear negative resistance oscillator model and the nonlinear Kurokawa model, will be described and analyzed in Part II. A new impulse response model, based on a phase plane approach, which has become very popular recently, will be the subject of Part III.