TUBE CIRCUIT DESIGN USING THE 'G' CURVE TECHNIQUE.
BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD
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The report presents the fundamental physical relations at the current stream within a tube and their relations to the external circuit. The simple amplifier formula is derived in this section. The techniques of use of the simple equation are discussed. The suggested method of presentation of tube characteristic curves to permit exact evaluation of tube voltage amplification at specific points is presented. This consists of inclusion of contours of constant transconductance and constant plate conductance. It is shown that use of the appropriate load line in conjunction with the mentioned curves permits evaluation of voltage amplification on a point-by-point basis. From this information distortion can be evaluated directly. In addition design techniques having particular application to design of oscillators are discussed. Determination of output amplitude and also the shift of frequency from an assumed approximate frequency is possible by techniques explained. A resume is presented of a large variety of types of circuits which can be studied in this manner. The equations found most useful in performing designs are included as well as some details on their use. Oscillator applications are given special attention since complete design of circuits in this field are relatively little discussed in the current literature and the textbooks. In addition, a set of nomographs is explained in Section D, which can be used to simplify routine calculations and consequently aid the user. Author
- Electrical and Electronic Equipment