NOISE-OPTIMIZATION TECHNIQUES FOR LINEAR TRANSISTOR AMPLIFIERS,
Abstract
Methods of minimizing the effects of internally generated noise in transistor amplifiers are described. From a transistor noise model, analytical expressions are formulated giving the operating point and source resistance that will optimize the noise performance of an amplifier. Both audio and RF amplifiers are considered. At audio frequencies, the work is primarily experimental and emphasis is on developing a simplified optimization procedure. For the RF amplifier, formulas are derived that describe the effect of source reactance on amplifier noise performance. Formulas giving noise figures of the transformer-coupled transistor amplifier are included and analytical expressions are formulated to arrive at the emitter current and transformer turns ratio that minimize the effects of internally generated noise. A theoretical and experimental study of temperature and its effect on noise performance is included, in which temperatures from 77 to 320 K are considered and a wide range of source resistances are used. Equations describing the degradation in noise performance produced by resistive stabilizing components are given, as well as an analytical description of the methods used to obtain noise-factor measurements. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1963
- Accession Number
- AD0424751
Entities
People
- Aldo Gene Di Loreto
Organizations
- Naval Air Weapons Station China Lake