Circuit for performing arithmetic operations in a demodulator

Details Circuit for performing arithmetic operations in a demodulator Circuit for performing arithmetic operations in a demodulator

1995-05-04

1997-09-16

Mai, Tan V.

Boots, shoes, and leggings

G06F 738

Patent

active

056687494

ABSTRACT:
A circuit (10) for determining a radius value and a phase value from an in-phase signal I(n) and a quadrature signal Q(n) iteratively approximates the phase value and the radius value based upon initial in-phase signal and quadrature signal preferably using the coordinate rotational digital computer (CORDIC) algorithm. The circuit (10) includes a multi-task arithmetic unit (50), memory (20), and a controller (30). The multi-task arithmetic unit includes registers (12, 14, 16), multiplexers (18, 22), shift registers (24, 25), and an adder (26) to perform various arithmetic operations. The circuit (10) further includes dynamic memory (32) for storing the solutions at different points in time of the radius value and phase value, which are subsequently used in the filtering of radius values and phase values.

REFERENCES:
patent: 4467444 (1984-08-01), Harmon, Jr et al.
patent: 4949292 (1990-08-01), Hoshino et al.
patent: 5388058 (1995-02-01), Yamada

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