H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/35, 330/38
H03G 3/20 (2006.01) H03G 1/00 (2006.01) H03G 5/00 (2006.01)
Patent
CA 1203584
11 ABSTRACT: A gain control arrangement comprises our current distribution circuits (1,2,3,4) each having two emitter- coupled transistors. The bases of the first (1) and third (3) current distribution circuits are interconnected as well as the bases of the second (2) and fourth (4) current distribution circuits. A control voltage (ust) is applied between the bases of each current distribution circuit. The interconnected emitters of the first (1) and third (3) current distribution circuit are connected to the outputs of a first converter circuit (5) comprising two transistors (51,52) whose emitters are coupled together by means of a first impedance element (50). The circuit (5) converts an input signal (ui) between the bases of the two transistors (51,52) into two opposite phase output currents, which are distributed by the first (1) and third (3) current distri- bution circuits. The interconnected emitters of the second (2) and fourth current distribution circuits are connected to the outputs of a second converter circuit (6) comprising two transistors (61,62) whose emitters are coupled together by means of a second impedance element (60). The outputs of the first () and second (2) current distribution cir- cuits on which output currents appear which are influenced in an opposed manner by the control voltage (ust) are con- nected to a first resistor (8) and the outputs of the third (3) and fourth (4) current distribution circuits on which output currents appear which are influenced in an opposed manner by the control voltage (ust) are connected to a second resistor (9). The voltages across the first (8) and second (9) resistors are applied to a differential ampli- fier (7), whose output voltage (uo) is applied to the in- puts of the second converter circuit (6). The output volt- age (uo) also forms the output voltage of the gain control arrangement. This output voltage (uo) is related to the control voltage (ust) in accordance with an exponential function over a wide range of control voltages without show- ing even harmonics.
420809
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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