Variable gain amplifier and differential amplifier

Details Variable gain amplifier and differential amplifier Variable gain amplifier and differential amplifier

2006-06-30

2008-03-04

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S252000

Reexamination Certificate

active

07339432

ABSTRACT:
Variable gain amplifier includes signal amplifying transistor, and gain control transistors at output and non-output sides. Emitters or sources of gain control transistors at output and non-output sides are connected to collector or drain of signal amplifying transistor. Output load is connected between collector or drain of gain control transistor at output side and power source side. Load is connected between collector or drain of gain control transistor at non-output side and power source side. Output load and load have the same impedance. Negative feedback path is connected between output end of gain control transistor at output side and input end of signal amplifying transistor. Negative feedback path is also connected between output end of gain control transistor at non-output side and input end of signal amplifying transistor. Two negative feedback paths have the same circuit constant. A differential amplifier is formed of a pair of such variable gain amplifiers.

REFERENCES:
patent: 6600371 (2003-07-01), Cali
patent: 6892062 (2005-05-01), Lee et al.
patent: 7027785 (2006-04-01), Summers et al.
patent: 7031687 (2006-04-01), Kivekas et al.
patent: 2001-007667 (2001-01-01), None
patent: 2002-252532 (2002-09-01), None

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