Controllable gain signal amplifier

Details Controllable gain signal amplifier Controllable gain signal amplifier

H - Electricity

03

G

330/19

H03G 3/30 (2006.01) H03G 1/00 (2006.01) H03G 3/10 (2006.01) H04N 9/68 (2006.01)

Patent

CA 1037571

CONTROLLABLE GAIN SIGNAL AMPLIFIER Abstract of the Disclosure A signal amplifier is supplied with input signals at its base electrode and also is supplied at its emitter with quiescent operating current from a current source. Amplified output signals developed at the collector of the amplifier are coupled to a transistor diode current splitter. The relative division of current in the splitter is controlled by coupling a variable direct current supply to the diode. The latter supply comprises a source of direct voltage, a variable resistive voltage divider coupled across the voltage source, and the combination of a voltage follower stage, a first series resistor coupled between the resistive divider and the input of the voltage follower and a second resistor coupled between the output of the follower and the diode. Gain controlled push-pull output signals may be provided by differentially coupling a second amplifier device to the first and coupling the output of a second current splitter to the second amplifier. The second current splitter is then also controlled by the same current source as the first. -1-

252984

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