Journal of the Japanese Society for Technology Education

Number 1
Volume 40


Design of an Inductance Loaded Amplifier
Kiyonobu KUSANO

This paper demonstrates that the output wave of an inductance-loaded amplifier produces an ellipse on the output characteristics chart, and traces this ellipse clockwise. Using these facts, non-distortion conditions for the output wave are analyzed, which are transformed into

L > (R/(2 p fmin))[(1+R/Ri+R/Ro)(1+R/Ri-R/Ro)/{(R/Ro+R/Ri)(R/Ro-R/Ri)}]1/2

for circuit 1., and

L > (Ri/(2 p fmin))<[>(Ri/Ro+1)(Ri/Ro- 1)]1/2

for circuit 2., where fmin is the lowest frequency of a signal, R is the inner resistance of the inductance (L), Ri is the resistance of a load, Vceo is the bias voltage between emitter and collector, Ico is the collector bias current, and Ro= Vceo/Ico.

Key words : Creation and production of things, 5th and 6th grade students, middle school students, manual dexterity, clumsiness, voluntary movement.