Amplifier circuit

Details Amplifier circuit Amplifier circuit

2011-03-01

2011-03-01

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S288000, C330S296000

Reexamination Certificate

active

07898335

ABSTRACT:
There is provided an amplifier circuit includes: an amplifying transistor; a first transistor having a DC current amplification factor generally equal to the DC current amplification factor of the amplifying transistor and constituting a current mirror circuit in conjunction with the amplifying transistor; and a current source circuit being operable to supply a current to the first transistor and including a second transistor having opposite conductivity type to the conductivity type of the first transistor. The second transistor is operated in a saturation region at a power supply voltage lower than an operating voltage range so that the DC current amplification factor of the amplifying transistor can be detected.

REFERENCES:
patent: 6043714 (2000-03-01), Yamamoto et al.
patent: 7245184 (2007-07-01), Ishikawa et al.
patent: 7477106 (2009-01-01), Van Bezooijen et al.
patent: 09-283576 (1997-10-01), None
patent: 2002-009118 (2002-01-01), None
patent: 2005-057002 (2005-03-01), None

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