Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1993-12-14
1995-08-15
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327 72, 327544, 327563, 330257, 330260, H03K 300
Patent
active
054423090
ABSTRACT:
A low distortion, low power output stage comprises a differential amplifier which replaces the source follower and constant current sources found in conventional output stages. Because there is no voltage drop between the inverting and noninverting differential inputs of the amplifier, no voltage drop exists between the input and output of the output stage. Thus, the gain stage or stages which precede the output stage are not required to swing above the output swing of the output stage. Additionally, because the amplifier has a common mode range which allows it to swing nearly rail-to-rail, the output of the output stage also swings nearly rail-to-rail.
REFERENCES:
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patent: 4881045 (1989-11-01), Dillman
patent: 4926068 (1990-05-01), Fujita
patent: 5097223 (1992-03-01), Alexander
patent: 5212458 (1993-05-01), Fitzpatrick et al.
patent: 5349305 (1994-09-01), Hsiao et al.
"A 50-MHz CMOS Variable Gain Amplifier for Magnetic Data Storage Systems," R. Gomez and A. A. Abidi, IEEE Journal of Solid-State Circuits (1992) Jun., No. 6, New York, pp. 935-939.
"Design and Applications of Tunable Analog BiCMOS Circuits," J. Fichtel, et al., IEEE Journal of Solid-State Circuits, (1992) Jul., No. 7, New York, pp. 1101-1104.
Advanced Micro Devices , Inc.
Callahan Timothy P.
Nu Ton My-Trang
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