Complex magnitude computation

Details Complex magnitude computation Complex magnitude computation

1983-10-19

1986-07-08

Malzahn, David H.

Boots, shoes, and leggings

364814, G06F 7552

Patent

active

045997012

ABSTRACT:
A digital circuit is disclosed for computing the magnitude of a complex number employing piece-wise linear approximations to achieve precision without the need for iteration. An illustrative implementing circuit employs a first stage for converting the in-phase and quadrature signals to their absolute values. The resultant signals are applied to a selection circuit which selects the maximum and minimum values. The resultant signals are combined with coefficients selected as a function of the operating interval and the resultant products added to yield a signal related to the magnitude of the input complex number.

REFERENCES:
patent: 3829671 (1974-08-01), Gathright
patent: 3858036 (1974-12-01), Lunsford
patent: 3870871 (1975-03-01), Nead
patent: 4481601 (1984-11-01), Heinle
Adams et al, "Magnitude Approximations for Microprocessor Implementations", IEEE Micro, Oct. 1983, pp. 27-31.

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