Radio Frequency Modeling of Audio Frequency Systems.
Abstract
The results of an effort to develop techniques for radio-frequency modeling at frequencies to 500 MHz of audio-frequency systems and their nonlinear response to amplitude-modulated excitation are reported. The approach involves investigation of a test amplifier to guide the modeling effort and to provide a means for validation measurements. The amplifier is conductively excited between its metal case and ground as well as at normal input terminals. Special techniques to avoid excitation of indeterminate external modes were exployed. In addition to high-frequency models of electronic components with parasitic elements, it was necessary to develop wideband RF models for shielded ferrite-core low-frequency inductors. It was also necessary to include models of the printed-circuit etch. The physical geometry of component and printed circuit layout played a significant role in the model development. The detection process for demodulation of amplitude-modulated radio carrier excitation was modeled in terms of the second-order nonlinear transfer functions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1980
- Accession Number
- ADA093491
Entities
People
- Charles J. Boardman
- James W. Graham
- William Welch