Amplifiers – With amplifier condition indicating or testing means
Patent
1997-11-18
1999-10-26
Pascal, Robert
Amplifiers
With amplifier condition indicating or testing means
330124R, 381120, H03F 368
Patent
active
059735554
ABSTRACT:
In a power amplifier apparatus comprising four amplifiers, each amplifier is adapted to amplify the half-wave output signal of a first differential amplifier by means of second and third output amplifiers (2, 3) to drive load (4) by their output amplifying signals and add the output amplifying signals by means of a non-linear circuit (5) in order to control the output DC voltage with the output signal of a second differential amplifier (6) according to the difference between the signal obtained by the non-linear addition and reference value Vref. Feedback signals X and Y of the left front first differential amplifier (1LF) and feedback signals X' and Y' of the right rear first differential amplifier (1RR) are applied to a single clip detection circuit 9 so that any clip in the output signal of the first and second output amplifiers can be detected by means of the feedback signals X, Y, X' and Y'.
REFERENCES:
patent: 5175508 (1992-12-01), Gingrich et al.
patent: 5255324 (1993-10-01), Brewer et al.
Kilian, von Ernst August and Henning Zierau, "Ein Neues Verstarkerkonzept fur Autoradios," Funkschau. Munchen: 65(1993) Apr. 16, No. 9, pp. 79-79.
Kokubo Kenichi
Taira Takayuki
Nguyen Khanh Van
Pascal Robert
Sanyo Electric Co,. Ltd.
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