BALANCERET FORSTAERKERUDGANGSTRIN

PCT No. PCT/SE80/00114 Sec. 371 Date Jan. 4, 1981 Sec. 102(e) Date Dec. 23, 1980 PCT Filed Apr. 21, 1980 PCT Pub. No. WO80/02488 PCT Pub. Date Nov. 13, 1980.A balanced amplifier output stage preferably intended to be used in a telephone instrument and which has its current supply from the telephone...

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Bibliographic Details
Main Author BENGT OLOF BERG
Format Patent
LanguageDanish
Published 29.09.1986
Edition4
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
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Summary:PCT No. PCT/SE80/00114 Sec. 371 Date Jan. 4, 1981 Sec. 102(e) Date Dec. 23, 1980 PCT Filed Apr. 21, 1980 PCT Pub. No. WO80/02488 PCT Pub. Date Nov. 13, 1980.A balanced amplifier output stage preferably intended to be used in a telephone instrument and which has its current supply from the telephone line includes two transistor amplifiers connected to parallel each having a top (T1, T2) and a bottom (T3, T4) transistor with series connected emitter-collector-circuits. Equally located transistors (e g T1, T2) in the series connections are driven in push-pull. To stabilize the current sum (I) passing through the two transistor amplifiers (T1, T3; T2, T4) connected in parallel there is a regulation circuit (T5) which compares the current sum (I) with a reference quantity (Vref) and feeds a correction signal in equal phase inputs of the amplifiers connected in parallel.
Bibliography:Application Number: DK19810000014