Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

2006-04-04

2006-04-04

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S278000

Reexamination Certificate

active

07023275

ABSTRACT:
A variable gain amplifier includes a current path control circuit which controls a path of a current flow through an amplifying transistor section, so as to control the actual size of transistors which make up the amplifying transistor section, and thereby control the gain and IIP3 (third-order Input Intercept Point). When the size W/L of the transistors is decreased or increased under constant current level maintained in a current path control circuit in the circuit, the transconductance (gain) is decreased or increased and the IIP3 is increased or decreased. According to this principle, there is provided a variable gain amplifier with a small mount area, capable of compensating for a decrease of the gain by an increase of the IIP3.

REFERENCES:
patent: 4795916 (1989-01-01), Liron
patent: 5619169 (1997-04-01), Matsuura
patent: 5945697 (1999-08-01), Kuno et al.
patent: 6021071 (2000-02-01), Otsuka
patent: 6049252 (2000-04-01), Iwata
patent: 6100761 (2000-08-01), Ezell
patent: 6201443 (2001-03-01), Tanji
patent: 6218899 (2001-04-01), Ezell
patent: 6472936 (2002-10-01), Jones
patent: 2003-46352 (2003-02-01), None
Soorapanth, Theerachet “RF Linearity of SHort-Channel MOSFERs” First International Workshop on Design of Mixed-Mode Integrated Circuits and Applications, Jul. 1997, pp. 81-84.

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