Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1995-09-14
1997-07-08
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
126295, H03F 345, H03F 368
Patent
active
056465750
ABSTRACT:
A composite amplifier is constructed by connecting the respective input terminals of a high-frequency amplifier and a precision amplifier together and by connecting the output of the precision amplifier to the offset trim port of the high-frequency amplifier. The amplifiers are structured such than a pole in the frequency response curve of the high-frequency amplifier cancels a zero in the frequency response curve of the precision amplifier, thereby producing a single pole roll off response curve for the composite amplifier. In the preferred embodiment the high-frequency and precision amplifiers are formed on a single chip and the pole-zero match is therefore maintained at all conditions of temperature and other variables.
REFERENCES:
patent: 3573644 (1971-04-01), Evel
patent: 3757241 (1973-09-01), Kime et al.
patent: 4532479 (1985-07-01), Blauschild
patent: 5045805 (1991-09-01), Schanen
patent: 5345191 (1994-09-01), Tanaka
patent: 5414388 (1995-05-01), Sauer
"IC Preamplifier Challenges Choppers on Drift", National Semiconductor, Application Note 79, Feb. 1993.
Mullins James B.
National Semiconductor Corporation
Steuber David E.
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