Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1979-05-04
1981-02-24
Dixon, Harold A.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330 79, 330105, 330293, H03F 345, H03F 108
Patent
active
042530709
ABSTRACT:
An arrangement to provide feedback to amplifier systems incorporating an electrical load. A current transformer in conjunction with a resistor is incorporated to provide a feedback correction signal to an amplifier which corrects for distortion caused by both the amplifier and the inductive load. A first embodiment provides a single-ended amplifier driving a load and incorporates the current transformer between the output of the amplifier and the load. The secondary winding of the transformer is in series with the input to the amplifier, and a resistor is connected across the secondary winding. The transformer determines the frequency bandwidth of the entire amplifier system, and the resistor value determines the gain of the amplifier. Such a configuration provides negative feedback to the amplifier which is directly proportional to changes in current in the load due to distortions caused by the amplifier or load. The second embodiment applies the principles of the present invention to a differential amplifier configuration. The primary winding of the current transformer is connected between the output of the amplifier and one end of the load. A secondary winding of the transformer is connected to the other end of the load and to the negative input of the differential amplifier. A resistor is connected across the secondary winding of the transformer.
REFERENCES:
patent: 1183875 (1916-05-01), Hartley
patent: 2239830 (1941-04-01), Rankin
patent: 2273619 (1942-02-01), Bruck
patent: 3368159 (1968-02-01), Richman
patent: 3435133 (1969-05-01), Gibson
patent: 3885219 (1975-05-01), Vaughn
Dixon Harold A.
Dynamic Compliance, Incorporated
Float Kenneth W.
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