Amplifiers – Combined with automatic amplifier disabling switch means
Patent
1995-12-11
1997-12-16
Mullins, James B.
Amplifiers
Combined with automatic amplifier disabling switch means
330148, 330258, 330301, H03F 368, H03F 3183
Patent
active
056990138
ABSTRACT:
First and second amplifiers are coupled together to provide complementary output signals at respective output terminals in response to application of operating potentials to first and second supply terminals of each amplifier and application of an input signal to at least the first amplifier. A switching circuit, responsive to a first level of a tri-state control signal supplied thereto, applies the operating potentials individually to the first and second supply terminals of each amplifier and concurrently couples the input signal to the input of the first amplifier and, responsive to a second level of the tri-state control signal, isolates all of the amplifier supply terminals and decouples the input signal. Transient disturbances are minimized by AC coupling the input signal and applying a common mode signal from a common mode source to the AC coupling, to a reference input of each amplifier and to the output terminal of each amplifier.
REFERENCES:
patent: 4581645 (1986-04-01), Beyers, Jr.
patent: 4647973 (1987-03-01), Deiss
patent: 5014017 (1991-05-01), Ishiguro et al.
patent: 5448311 (1995-09-01), White et al.
Graeme, Jerald G. Applications Of Operational Amplifiers Third Generation Techniques, McGraw-Hill, Pub. 1973, pp. 50-53.
"Schematic diagram of stereo, selected audio and Hi-Fi outputs", Television Chassis No. CTC-179, mfg. by Thomson Consumer Electronics, Inc., Nov. 1995 .
Emanuel Peter M.
Liao Frank Y.
Mullins James B.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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