Dynamic information storage or retrieval – Specific detail of information handling portion of system – Mechanical modification or sensing of storage medium
Patent
1982-08-25
1985-04-16
Faber, Alan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Mechanical modification or sensing of storage medium
330260, 330311, G11B 300, H03F 345
Patent
active
045120080
ABSTRACT:
A small signal amplifying circuit suitable for use in a system such as a disc player-amplifier system in which metal contact portions such as connectors are used between a signal source and an amplifier. The small signal amplifying circuit according to the invention is an improvement of a circuit which is designed to eliminate distortion caused by the metal contact portions by transmitting a signal in a state in which the signal is superposed on a direct current. The circuit according to the invention includes a first transistor provided in a signal source and a second transistor provided in an amplifier which constitutes a differential amplifier with the first transistor. By negative feeding-back the output of the amplifier to the base of the second transistor, distortion factor, signal-to-noise ratio and stability in characteristics are remarkably improved.
REFERENCES:
patent: 3522390 (1970-07-01), Wieder
patent: 3624315 (1971-11-01), Broce
patent: 4274058 (1981-06-01), Suzuki
patent: 4293823 (1981-10-01), Hochberg
patent: 4296383 (1981-10-01), Jeandot
patent: 4328573 (1982-05-01), Kurtin
G.E. Transistor Manual, .COPYRGT.1969, pp. 111, 115-117.
Faber Alan
Nippon Gakki Seizo Kabushiki Kaisha
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