Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1981-09-08
1983-03-29
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330258, 330259, H03F 345
Patent
active
043785298
ABSTRACT:
A pair of common base connected transistors have their emitters coupled to provide the input terminals of a differential amplifier. The collectors are coupled to a current mirror that provides a small current bias that operates the transistors at equal current densities. The common bases are coupled to a node that is driven to a level that causes the bases to track the emitters with a one V.sub.BE offset that will therefore automatically adjust to conform to the applied current. When a remotely grounded transducer is coupled to the amplifier input it can operate at a common mode potential outside of the span of the power supply that operates the amplifier.
REFERENCES:
patent: 3786362 (1974-01-01), Marsh et al.
patent: 3895307 (1975-07-01), Furuhashi
patent: 3938055 (1976-02-01), Buhler
patent: 4059808 (1977-11-01), Sakamoto et al.
Jaeger, "High Performance Differential Amplifier Input Stage", IBM Technical Disclosure Bulletin, vol. 20, No. 2, Jul. 1977, pp. 812, 813.
Buhler, "Differential Amplifier", IBM Technical Disclosure Bulletin, vol. 13, No. 12, May 1971, p. 3717.
Mullins James B.
National Semiconductor Corporation
Schulte Neil B.
Winters Paul J.
Woodward Gail W.
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