This paper proposes for the first time symbolic
formula of the power spectrum of CMOS Cross Couple Oscillator
and its modified circuit. Many principles existed to derived power
spectrum in microwave textbook such as impedance, admittance
parameters, ABCD, H parameters, etc. It can be compared by graph
of power spectrum which methodology is the best from the point of
view of practical measurement setup such as condition of impedance
parameter which used superposition of current to derived (its current
injection at the other port of the circuit is zero, which is impossible in
reality). Four graphs of impedance parameters of cross couple
oscillator are proposed. After that four graphs of scattering
parameters of CMOS cross coupled oscillator will be shown.
 H. J. Carlin, “The Scattering Matrix in Network Theory”, IRE
Tranactions on Circuit Theory”, June 1956, pp. 88-97.
 K. Kurokawa, “Power Waves and the Scattering Matrix”, IEEE
Transactions on Microwave Theory and Technique, March 1965, pp.
 D. M. Pozar, “Microwave Engineering”, 2nd edition, Wiley, copyright
 B. Razavi, “RF Microelectronics”, 2nd edition, Prentice-Hall, copyright
 D. O. Pederson, K. Mayaram, “Analog Integrated Circuits for
Communication”, Principles, Simulation and Design, 2nd edition,
Springer Verlag, copyright 2008.