Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1983-12-05
1985-06-25
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
H03F 304
Patent
active
045256837
ABSTRACT:
A current mirror circuit comprising a first current mirror circuit with a first error correction transistor connected between the base and collector of the first transistor of the first current mirror; a second error correction transistor connected to the first error correction transistor and a second current mirror circuit connected to an input current source and the base of the second error correction transistor. The second error correction transistor samples the signal from the collector of first error correction transistor and feeds its base current, which is almost equivalent to the base current of the first error correction transistor, to the input of the second current mirror circuit. The second current mirror circuit combines the input current source current with the base current of the second error correction transistor and generates a current which is fed to the collector of the first transistor of the first current mirror circuit. The value and polarity of the current is such as to offset the base error current of the first error correction transistor, thus improving the relationship of input current to output current of the first current mirror circuit by a factor of .beta.+1. This improvement is especially significant when using lateral PNP transistors which typically have very low betas.
REFERENCES:
patent: 3855541 (1974-12-01), Leidich
patent: 3886466 (1975-05-01), Wheatly, Jr.
patent: 3962592 (1976-06-01), Thommen et al.
patent: 4166971 (1979-09-01), Schneider
patent: 4217539 (1980-08-01), Okada
patent: 4238738 (1980-12-01), Komori
patent: 4278946 (1981-07-01), Kaplan
patent: 4297646 (1981-10-01), Lo Cascio
patent: 4311967 (1982-01-01), Schade, Jr.
patent: 4317082 (1982-02-01), Gross
Analog Integrated Circuit Design, Alan B. Grebene, pp. 50, 51, 56-59, 112, 113.
"A Simple Three-Terminal IC Bandgap Reference", A. Paul Brokaw, IEEE J. Solid State Circuits, vol. SC-9, pp. 388-393, Dec. 1974.
High Performance Operational Amplifier, uA741.
Basic Integrated Circuit Engineering, Hamilton and Howard, pp. 308-316.
"A Highly Stable VCO for Application in Monolithic Phase Locked Loops", Robert R. Cordell and William G. Garrett, IEEE J. Solid State Circuits, pp. 480-485, vol. SC-10, No. 6, Dec. 1975.
Gillman James W.
Motorola Inc.
Motsinger F. John
Mottola Steven J.
Mullins James B.
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