Calculation method and circuit for obtaining a logarithmic appro

Details Calculation method and circuit for obtaining a logarithmic appro Calculation method and circuit for obtaining a logarithmic appro

1996-10-10

1998-09-01

Ngo, Chuong Dinh

Boots, shoes, and leggings

3647485, G06F 752

Patent

active

058019740

ABSTRACT:
The present invention discloses a calculation method utilizing a circuit and a circuit for obtaining a logarithmic approximation value. The circuit minimizes the error in calculating a logarithmic approximation value by adding a simple circuit. The method includes the steps of obtaining a square value of an input data value, which is greater than or equal to 0 and less than 1. A subtracting step substracts the square value of the input data value from the input data value to obtain a first output result. The first output result is then divided by 4 to obtain a second output result. The input data value is then added to the second output result to obtaining a third output result.

REFERENCES:
patent: 5365465 (1994-11-01), Larson
patent: 5600581 (1997-02-01), Dworkin et al.
patent: 5604691 (1997-02-01), Dworkin et al.
patent: 5629884 (1997-05-01), Pan et al.
patent: 5642305 (1997-06-01), Pan et al.

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