Abstract
A simple nonlinear technique for the design of high-efficiency and high-power switching-mode oscillators is presented. It combines existing quasi-nonlinear methods and the use of an auxiliary generator (AG) in harmonic balance. The AG enables the oscillator optimization to achieve high output power and dc-to-RF conversion efficiency without affecting the oscillation frequency. It also imposes a sufficient drive on the transistor to enable the switching-mode operation with high efficiency. Using this AG, constant-power and constant-efficiency contour plots are traced in order to determine the optimum element values. The oscillation startup condition and the steady-state stability are analyzed with the pole-zero identification technique. The influence of the gate bias on the output power, efficiency, and stability is also investigated. A class-E oscillator is demonstrated using the proposed technique. The oscillator exhibits 75 W with 67% efficiency at 410 MHz.
| Original language | English |
|---|---|
| Article number | 1705681 |
| Pages (from-to) | 3630-3639 |
| Number of pages | 10 |
| Journal | IEEE Transactions on Microwave Theory and Techniques |
| Volume | 54 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2006 Oct |
Keywords
- Class-E tuning
- High-efficiency oscillator
- Non-linear optimization
- Oscillation stability
- Startup criterion
ASJC Scopus subject areas
- Radiation
- Condensed Matter Physics
- Electrical and Electronic Engineering