Electrical audio signal processing systems and devices – With amplifier
Patent
1982-09-23
1984-11-13
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
With amplifier
330264, H03F 316
Patent
active
044830165
ABSTRACT:
An amplifier circuit for a speaker 12. The circuit includes an operational amplifier 16 connected to a supply rail 24 and a supply rail 26 through a regulator 28 and a regulator 30. The circuit is characterized by a P channel MOS-FET 32 having a source 34 connected to the rail 24 and a drain 36 connected to the speaker 12 and a gate 38, and an N channel MOS-FET 40 having a source 42 connected to the rail 26 and a drain 44 connected to the speaker 12 and a gate 46. A NPN stage 48 is responsive to the output 56 of the amplifier 16 for establishing a voltage differential between the gate 38 of the MOS-FET 32 and the rail 24 to drive the MOS-FET 32 into conduction. A PNP stage 50 is responsive to the output 56 of the amplifier 16 for establishing a voltage differential between the gate 46 of the MOS-FET 40 and the rail 26 to drive the MOS-FET 40 into conduction. The stages 48, 50 are connected to ground 52. A feedback circuit 94 interconnects the drain 36 of the MOS-FET 32 and the ground 52 side of the stage 48, and a feedback circuit 96 interconnects the drain 44 of the MOS-FET 40 and the ground 52 side of the stage 50. A feedback circuit 98 interconnects the speaker 12 and the amplifier 16 for returning a portion of the output voltage to the amplifier 16 to cause the output signal to track the signal at the input to the amplifier 16. A PNP transistor 68 has its base 72 connected to the source 34 of the MOS-FET 32 and its emitter 70 connected to the rail 24 and its collector 76 connected to the output 12, and an NPN transistor 82 has its base 84 connected to the source 42 of the MOS-FET 40 and its emitter 87 connected to the rail 24 and its collector 90 connected to the output 12.
REFERENCES:
patent: 3601712 (1971-08-01), Elazer
patent: 3872390 (1975-03-01), Nash
patent: 3924070 (1975-12-01), Seaver
patent: 4015212 (1977-03-01), Miyata
patent: 4031482 (1977-06-01), Tsurushima
patent: 4100502 (1978-07-01), Yamashiro
patent: 4184124 (1980-01-01), Asakawa
patent: 4194165 (1980-03-01), Skulski
patent: 4352073 (1982-09-01), Leuthold
patent: 4390851 (1983-06-01), Higgins et al.
Hochstein Peter A.
Shih Kelvin
Dwyer James L.
Milton Jr. Harold W.
Rubinson Gene Z.
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