H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/23
H03F 3/45 (2006.01) H03G 1/00 (2006.01) H03G 1/04 (2006.01)
Patent
CA 1149028
PHD. 79-154 10 ABSTRACT: A variable-gain differential amplifier comprises a first long-tailed transistor pair between the bases of which the input signal is applied. The emitter-collector paths of the transistors of the first pair are included in the tails of second and third long-tailed transistor pairs respectively and load resistors between the lower termi- nals of which the output signal appears are included in the respective collector circuits of one transistor of each of the second and third pairs, and hence in the collector cir- cuits of the respective transistors of the first pair. The second and third pairs are controlled by a gain control sig- nal thereby diverting a variable proportion of the collector signal currents of the transistors of the first pair away from the load resistors and hence varying the gain of the circuit. In order that variations in the gain control sig- nal should not affect the d.c. level at the amplifier out- put the collectors of the other transistors of the second and third pairs are commoned and connected to the input of a current splitter the two output currents of which are fed to the respective load resistors, whereby compensating for any changes in the standing currents through the load resistors which would otherwise be produced by changes in the gain control voltage.
367096
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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