H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/23
H03G 3/30 (2006.01) H03F 3/45 (2006.01) H03G 1/00 (2006.01) H03G 3/00 (2006.01)
Patent
CA 1139850
14.11.78 PHN 9068 ABSTRACT: "Amplifier arrangement with variable gain factor." An amplifier arrangement with variable gain factor comprising a first and a second emitter-coupled transistor and a third and a fourth emitter-coupled transistor. The collector electrodes of the first and third transistor lead to an output of the amplifier arrangement. Between the interconnected base electrodes of the first and the fourth transistor and the inter- connected base electrodes of the second and the third transistor a control signal can be applied. A signal current is applied to the interconnected emitter elec- trodes of the first and the second transistor and the interconnected emitter electrodes of the third and the fourth transistor by means of a first and a second voltage-current converter respectively, at least one of the two converters comprising a signal input and both converters having negative feedback to the output of the amplifier arrangement.
323252
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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