Amplifiers – Modulator-demodulator-type amplifier
Patent
1976-04-20
1977-08-02
Mullins, James B.
Amplifiers
Modulator-demodulator-type amplifier
330 28, 330149, H03F 318, H03F 3183
Patent
active
040399656
ABSTRACT:
In an audio frequency transistor amplifier comprising an output amplifier circuit to be coupled to a load, a preceding stage amplifier circuit coupled to the input of the output amplifier circuit, and a negative feedback circuit including a DC blocking electrolytic capacitor or polarized capacitor coupled between the output amplifier circuit and the preceding stage amplifier circuit to feed the output signal of the output amplifier circuit back to the preceding stage amplifier circuit, the electrolytic capacitor, when an audio signal to be amplified is fed back to pass therethrough, generates harmonics of the audio signal due to its nonlinear property, thereby to cause a decrease in the articulation and resolution of reproduced sound. The invention resides in coupling in parallel, in order to eliminate or reduce the harmonic noises generated by the electrolytic capacitor, a nonpolarized capacitor having a much smaller loss than the electrolytic capacitor to the same. For the purpose of raising the harmonic noise eliminating or reducing effect, a plurality of nonpolarized capacitors may be coupled in parallel to the electrolytic capacitor.
Mullins James B.
Tokyo Shibaura Electric Co. Ltd.
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