Amplifier circuit

Details Amplifier circuit Amplifier circuit

2011-08-23

2011-08-23

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

C330S252000

Reexamination Certificate

active

08004365

ABSTRACT:
The invention relates to a circuit arrangement (30, 40, 70, 80, 90) of a low-noise linear input amplifier comprising a parallel circuit of a common-base circuit (20) and a common-emitter circuit (30), the emitters of two first transistors (Q3, Q4) are interlinked and the bases of two second transistors (Q1, Q2) are intercoupled, the collectors are interconnected in parallel with the output, and the source voltage (VG) is interlinked with the emitters of the second transistors (Q1, Q2) and with the bases of the first transistors (Q3, Q4), in which a linearization of the output current (OUTLNA1,2) as a function of the source voltage (VG) is achieved by a linearization of the transfer function, such as the tangential hyperbolic function, of the first and second transistors (Q1, Q2, Q3, Q4).

REFERENCES:
patent: 4277756 (1981-07-01), Kriedt et al.
patent: 6504403 (2003-01-01), Banks et al.
patent: 7057457 (2006-06-01), Irvine et al.
patent: 2001/0004219 (2001-06-01), Bangs et al.
patent: 2005/0068106 (2005-03-01), Irvine
patent: 19736900 (1999-03-01), None
patent: 0893880 (1999-01-01), None
patent: 03/005566 (2003-01-01), None

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