Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1988-12-23
1990-02-20
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
049029843
ABSTRACT:
An improved differential amplifier having circuitry to enhance the slew rate and to provide a means for nulling the offset voltage during fabrication of the amplifier as an integrated circuit. The differential amplifier comprises an input stage connected to a current mirror. A slew rate enhancement circuit injects current into selected points of the circuit when the input voltage exceeds a predetermined threshold. An offset trim circuit injects a selected amount of current into the current mirror to alter the current flow between the input stage and the current mirror, thereby reducing the offset voltage. The selected amount of current is dictated by diodes which may be permanently shorted at various stages during fabrication, both before and after the amplifier is enclosed in an IC package.
REFERENCES:
patent: 3668538 (1972-06-01), Hearn
patent: 4002993 (1977-01-01), van de Plassche
patent: 4075575 (1978-02-01), Robe
patent: 4240040 (1980-12-01), Saari
patent: 4616190 (1986-10-01), van de Plassche
patent: 4636743 (1987-01-01), Cotreau
patent: 4636744 (1987-01-01), King et al.
Flink John A.
Vinn Charles L.
Mottola Steven
Raytheon Company
Sharkansky Richard M.
Walsh Edmund J.
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