Variable gain circuit

Details Variable gain circuit Variable gain circuit

2010-06-09

2011-11-29

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S278000

Reexamination Certificate

active

08067984

ABSTRACT:
There is provided a variable gain circuit system which is inductorless and capable of achieving a high gain and a wide band by elements for achieving variable gain to prevent decreasing a gain or deteriorating the band. The variable gain circuit includes: transistors; a resistor connected as a load of each transistor; a voltage source applying a bias voltage to each gate of the transistors; a switch selectively connecting the voltage source or a ground potential to each gate of the transistors in accordance with gain setting; and a current source connected to a common input. A drain of each transistor is connected to an input of a circuit in a subsequent stage.

REFERENCES:
patent: 6175278 (2001-01-01), Hasegawa
patent: 7358816 (2008-04-01), Ryu et al.
patent: 2002/0190796 (2002-12-01), Park et al.
patent: 2006/0022748 (2006-02-01), Udagawa
Ahmed Abd El-Fattah, “Equalizer Implementation for 10 Gbps Serial Data Link in 90 nm CMOS Technology.”, IEEE ICM-Dec. 2007, 4 pages.

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