Professorship: Circuit Theory Code: S-55

In this work, two separate items, harmonic balance and phase-noise analysis, have been investigated. Harmonic balance is an analysis method that solves the periodic (or quasi-periodic) steady state of a circuit. After the large signal steady state has been solved, a noise analysis can be carried out. It is assumed that the noise is small-signal noise. In the rst part, the fundamentals of the harmonic balance analysis method are reviewed in short. The implementation of nodal harmonic balance (NHB) is explained in detail, and the implemented method is compared with the traditional piecewise harmonic balance (PHB). Nodal harmonic balance is a suitable method for simulating large RFICs. Practical, real world examples have been used to test the implemented simulation method. Noise analysis based on harmonic balance is introduced in the second part. The theory related to phase and amplitude modulated noise is derived. The implementation of modulated (frequency dependent) noise sources is also explained. The methods introduced in this thesis have been implemented into the commercial circuit simulator APLAC