Amplifiers – With amplifier condition indicating or testing means
Patent
1989-07-12
1990-07-31
Mullins, James B.
Amplifiers
With amplifier condition indicating or testing means
330279, H03G 330, G01R 2100
Patent
active
049453149
ABSTRACT:
The invention relates to an amplifier arrangement with load independent saturation detection, including an input stage (7) having a first and a second input terminal (5, 6), an output stage (8) coupled to the input stage (7) and having at least one output transistor (T1, T2), and an output terminal (4) connected to the first input terminal (5) via a coupling network (R1, R2, C). In order to obtain a detection signal when the at least one output transistor (T1, T2) becomes saturated, there is provided a detection device, (16) coupled to the input stage (7) to detect, during operation, an amplitude difference between a signal (V.sub.i) to be amplified, which signal is applied to the second input terminal (6), and a portion (V.sub.t) of the signal (V.sub.o) appearing on the output terminal (4), which portion is applied to the first input terminal (5) via the coupling network (R1, R2, C).
REFERENCES:
patent: 3852669 (1974-12-01), Bowman et al.
patent: 3891933 (1975-06-01), Suzuki et al.
patent: 3949317 (1976-04-01), Crosby
patent: 4048573 (1977-09-01), Evans et al.
patent: 4318853 (1982-03-01), Sondermeyer
patent: 4536717 (1985-08-01), Hauge et al.
Goodman Edward W.
Mullins James B.
U.S. Philips Corporation
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