Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1995-05-23
1996-11-12
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
330299, 330310, H03F 3343
Patent
active
055744036
ABSTRACT:
A simple high speed precision transconductance amplifier circuit having a low offset. The circuit uses as an input stage two substantially identical transistors of a first conductivity type connected in series so as to have the same current there through, neglecting base currents. A second stage uses two substantially identical transistors of a second conductivity type connected in series, with the output of the amplifier being a current mirrored from the second stage. The offset is maintained low by maintaining the V.sub.BE of the transistors in the two stages substantially identical by connecting together the base and collector of one of the transistors in one stage and coupling the resulting V.sub.BE of the transistor so coupled to one of the transistors of opposite conductivity type in the other stage. Various embodiments and variations are disclosed.
REFERENCES:
patent: 4420725 (1983-12-01), Sueyoshi et al.
patent: 5245222 (1993-09-01), Carobolante
patent: 5311146 (1994-05-01), Brannon et al.
Maxim Integrated Products
Mullins James B.
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