Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-03-30
1994-03-01
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, 330257, H03F 345
Patent
active
052911497
ABSTRACT:
An operational amplifier includes differential amplification circuitry and current mirror circuitry. The differential amplification circuitry includes first and second differential amplification circuits disposed symmetrically in the upper and lower parts of a circuit diagram, and the current mirror circuitry includes first and second current mirror circuits disposed symmetrically in the upper and lower parts of the circuit diagram. The input ends of the first and second differential amplification circuits are connected to a non-inverting input terminal and a inverting input terminal, respectively. Output ends of the first and second differential amplification circuits on the sides of the respective non-inverting inputs are independently connected to the input ends of the first and second current mirror circuits Output ends of the first and second differential amplification circuits on the sides of the respective inverting inputs are independently connected to a positive power supply and a negative power supply, respectively. Output ends of the first and second current mirror circuits are connected together to a load impedance.
REFERENCES:
patent: 4360785 (1982-11-01), Schade, Jr.
patent: 4377789 (1983-03-01), Hoover
patent: 4636743 (1987-01-01), Cotreau
Mullins James B.
Murata Manufacturing Co. Ltd.
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