Arithmetic operation circuit for finding a square root of a sum

Details Arithmetic operation circuit for finding a square root of a sum Arithmetic operation circuit for finding a square root of a sum

1982-09-03

1985-04-16

Smith, Jerry

Boots, shoes, and leggings

364818, G06G 722

Patent

active

045119910

ABSTRACT:
An arithmetic operation circuit for finding a square root of a sum of squared values having first to fourth transistors is disclosed. The collector of the first transistor is connected to a first current source and the base of the first transistor itself. The collector of the second transistor is connected to the emitter of the first transistor and the base of the second transistor itself, and its emitter is connected to a first power source. The emitter of the third transistor is connected to an output terminal and its base is connected to the collector of the first transistor. The collector of the fourth transistor is connected to the emitter of the third transistor and the base of the fourth transistor itself, and its emitter is connected to a second power source. A difference between the output current flowing into the output terminal and a given current is fed to the collector of the third transistor. A sum of the output current flowing into the output terminal and the given current is fed to the collector of the fourth transistor.

REFERENCES:
patent: 3870871 (1975-03-01), Nead
Stern, T. E. et al., "A Circuit for the Square Root of the Sum of the Squares", Proceedings of the IEEE, 1963, p. 596.
Gilbert, "Translinear Circuits: A Proposed Classification" Electronics Letters, vol. 11, No. 6, (Mar. 20, 1975), p. 136.
Barker et al., "Root-Law Circuit Using Monolithic Bipolar-Transistor Arrays", Electronics Letters, vol. 10, No. 21, (Oct. 17, 1974), pp. 439-440.

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