Amplifiers – With semiconductor amplifying device – Integrated circuits
Patent
1981-10-22
1985-02-19
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Integrated circuits
330 66, H03F 304
Patent
active
045008507
ABSTRACT:
The previously unknown cause of significant non-linear distortion by non-linear discrete and stray capacitances located in portions of an amplifier circuit where Miller effect enhancement of such capacitance occurs is minimized by one or more means, such as utilizing unique discrete capacitor arrangements and positioning of transistor terminal leads, and unique printed circuit board constructions and selectively applied solder mask coatings which minimize or eliminate non-linear stray capacitance effects which were not heretofore considered to be a problem in audio amplifier circuits. Non-linearities in capacitance-voltage characteristics are reduced by the reduction in voltage gradients achieved by connecting two or more capacitors in series to produce the overall desired capacitor value heretofore supplied by only a single capacitor. Distortion producing Miller effect enhanced stray capacity effects between control and load terminals of amplifying transistors or across the discrete capacitors in the multistage negative feeding circuits of audio amplifiers are reduced by modifying the dielectric properties constant of the printed circuit board as by placing apertures therein between the conductive strips to which such transistor terminals and capacitors are connected, or by increasing the distance between points of connections of these terminals to the printed circuit board, generally requiring the extension of one or more of the leads involved parallel to the circuit board.
REFERENCES:
patent: 4403200 (1983-09-01), Davis
Hattis Russell E.
Mullins James B.
Wan G.
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