Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1981-11-23
1984-01-31
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
044292848
ABSTRACT:
A differential amplifier stage is disclosed which utilizes opposed pairs of complementary transistors. The emitter electrodes of the complementary transistors of each pair are connected via matched resistors. A second matched pair of resistors are connected between the emitter electrodes of the input transistor of each complementary transistor pair. The interconnection of the second match pairs of resistors is connected to the base electrodes of the other transistors of each complementary transistor pair by a diode. A constant bias current is applied to the diode-transistor interconnection to provide current to the second pair of resistors to develop like potentials. These potentials establish floating bias potentials across the matched resistors in the emitter circuits of the complementary transistor pairs and thereby establish bias current in the transistors.
REFERENCES:
patent: 3649926 (1972-03-01), Hill
patent: 3828268 (1974-08-01), Nishio
patent: 4059808 (1977-11-01), Sakamoto et al.
D.A.T.A. Linear Integrated Circuit, 20th Edition, 1979, pp. 173 and 221.
National Semiconductor Linear Databook (1978), LM101 Operational Amplifier, pp. 3-60 & 3-65.
Herrmann E. P.
Mullins James B.
RCA Corporation
Tripoli J. S.
Whitacre E. M.
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