Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1981-04-06
1983-10-25
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
323316, H03F 304
Patent
active
044121865
ABSTRACT:
A current mirror circuit having high accuracy in its current mirror transfer ratio .lambda. even when constructed of P-N-P transistors. The circuit includes two stages each having three transistors of one conductivity type and a fourth transistor of a different conductivity type. Two of the like transistors of each stage have a common base electrode and the third like transistor is connected between the common electrode and a reference potential. The fourth transistor of each stage has its base connected to an individual one of the collectors of the base-connected transistors and its emitter connected both to a current source and the base of the third like transistor. The emitters of the base-connected transistors of the first stage and the collectors of the fourth transistors of each stage are connected to a power supply. The emitters of the base-connected transistors of the second stage are connected to the collectors of the base-connected transistors of the first stage. The collector of one of the base-connected transistors of the second stage is connected to a current source as an input and the collector of the other base-connected transistor of the second stage is connected to a load as the output.
REFERENCES:
patent: 3936725 (1976-02-01), Schneider
patent: 4166971 (1979-09-01), Schneider
Radovsky, "Current-Mirror Amplifiers Having Current Gains Less Influenced by the Base Currents of Component Transistors," RCA Technical Notes, TN No. 949, Dec. 31, 1973.
Wilson, G. R., "A Monolithic Junction FET-n-p-n Operational Amplifier," IEEE Journal of Solid-State Circuits, vol. SC-3, No. 4, 1968.
Frederiksen, T. M., et al., "A New Current-Differencing Single-Supply Operational Amplifier," IEEE Journal of Solid-State Circuits, vol. SC-6, No. 6, 1971.
Hart, B. L., et al., "D.C. Matching Errors in the Wilson Current Source, "Electronics Letters, vol. 12, No. 15, pp. 389-390, 1976.
Mullins James B.
Tokyo Shibaura Denki Kabushiki Kaisha
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