Balanced variable gain amplifier capable of achieving...

Details Balanced variable gain amplifier capable of achieving... Balanced variable gain amplifier capable of achieving...

2006-11-21

2006-11-21

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

07138867

ABSTRACT:
A balanced gain control amplifier contains first and second transistors differentially connected to each other and having their emitters connected to a first current source. The balanced gain control amplifier also contains third and fourth transistors differentially connected to each other and having their emitters connected to a second constant current source. The collectors of the first and fourth transistors are connected to a power terminal through a common first load resistor, and the collectors of the second and third transistors are connected to the power terminal through a common second load resistor. A signal may be input between the bases of the first and third transistors and the bases of the second and fourth transistors. The current of the second constant current source is variable in a range no more than the current value of the first constant current source.

REFERENCES:
patent: 4528516 (1985-07-01), Hill, III
patent: 6529075 (2003-03-01), Bruck et al.
patent: 2001-007667 (2001-12-01), None
patent: 2001-358546 (2001-12-01), None

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