Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1980-10-31
1983-04-19
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
323316, H03F 318
Patent
active
043807402
ABSTRACT:
A current amplifier having a gain factor substantially independent of the common emitter forward current gain (beta) of its component transistors uses a cascade arrangement of current mirror amplifiers (CMA's) to compensate for variations in beta. The output of a first CMA, which current transfer ratio thereof decreases as beta decreases, is connected to the input of a second CMA, which current transfer ratio thereof increases as beta decreases. The composite current gain of the combined first and second CMA's therefore tends to remain constant as the respective betas vary.
REFERENCES:
patent: Re29910 (1979-02-01), Ahmed
patent: 3952257 (1976-04-01), Schade, Jr.
patent: 4258330 (1981-03-01), Kaneko et al.
Radovsky, "Current-Mirror Amplifiers Having Current Gains Less Influenced by the Base Currents of Component Transistors", RCA Technical Note No. 949, Dec. 31, 1973.
Schade, Jr., "Current-Mirror Amplifiers Having Current Gains Less Influenced by the Base Currents of Component Transistors", RCA Technical Note 990, Dec. 26, 1974.
Emanuel Peter M.
Mullins James B.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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