Differential amplifier with improved operational range

Details Differential amplifier with improved operational range Differential amplifier with improved operational range

1995-09-12

1997-03-25

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

H04F 345

Patent

active

056148658

ABSTRACT:
A variable amplitude type differential amplifier capable of reducing power consumption without lowering the frequency characteristics even when large variations of output amplitude are desired. The differential amplifier includes first and second transistor pairs wherein bases of each transistor are connected to bases of the other transistors in the pair. The emitters of the first transistor and that of the second transistor are common with each other, and an emitter of the third transistor and that of the fourth transistor are common with each other, wherein current sources are connected with each common emitter pair. The current sources activate only one common transistor pair at a time. A resistor is connected between the collector of first transistor and a voltage source. A second resistor is connected between a collector of the second transistor and the voltage source. A further resistor is connected between the collectors of the first and third transistors, and another resistor is connected between the collectors of the second and fourth transistors. The output is taken from the node connecting the further resistor to the third transistor.

REFERENCES:
patent: 4369410 (1983-01-01), Fenk
patent: 5406221 (1995-04-01), Sanani et al.
patent: 5461342 (1995-10-01), Crabtree

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