H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/38
H03G 3/20 (2006.01)
Patent
CA 1208711
ABSTRACT: A gain control arrangement comprises a first cur- rent distribution circuit (101) having two transistors whose emitters are connected to a first current source (103) and a second current distribution circuit (102) having two transistors whose emitters are connected to a second current source (104). The bases of the transistors of the first (101) and second (102) current distribution are intercon- nected and a control voltage (ust) is applied between the bases of each current distribution circuit. The collectors of two transistors of the first (101) and second (102) cur- rent distribution circuits which vary in the same sense by the control voltage (ust) are connected to the emitters of two transistors (105,106), between which a first impedance element (107) is arranged. The input signal (ui) of the arrangement is applied between the bases of these transis- tors (105,106), whose collectors are connected to a first (108) and a second (109) resistor. The voltage across these resistors (108,109) is amplified by a first opera- tional amplifier (110), whose output voltage is applied to a converter circuit (120), which converts said voltage into two opposite-phase output currents, which are applied to the interconnected emitters of the first (101) and second (102) current distribution circuits. The collectors of the other two transistors of the first (101) and second (102) current distribution circuits are connected to the emitters of two further transistors (112,113) between which a second impedance element (111) is arranged. The collectors of these transistors (112,113) are connected to a third (114) and a fourth (115) resistor respectively. The voltage across these resistors (114,115) is amplified by a second operational amplifier (116) whose output voltage (uo) is applied between the bases of the two further transistors (112,113). This output voltage (uo) also forms the output voltage of the 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.
484622
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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