Patent ID: 7864886

Claim:
A phase calculation apparatus comprising: a quarter surface preprocessor determining the bigger one between an absolute value of I component data and an absolute value of Q component data as horizontal component data and the smaller one as perpendicular component data, and detecting information on a phase region indicating an m th (m=1, through to 8) phase region (the m th phase region is between (mâˆ’1)Ï€/4 and mÏ€/4) in which the I/Q component data are located; a phase representative value detector detecting phase representative values x corresponding to the horizontal component data and the perpendicular component data; a quarter surface postprocessor calculating phase values of the I/Q component data based on the detected information on the phase region and the detected phase representative values x using binary search, wherein the quarter surface postprocessor comprises: a phase representative value storage unit storing phase representative values corresponding to phases of 2 N partial regions into which a first phase region is divided, and outputting phase representative values corresponding to input addresses A N-1 A N-2 through to A 0 among the stored phase representative values; a reference value generator that outputs N reference values, wherein N is an integer greater than one; and an address generator determining, if the perpendicular component data is larger than an n th (n=1, through to N) reference value of the N reference values received from the reference value generator, setting a value of A N-n to a first binary value, and if the perpendicular component data is smaller than or equal to the n th (n=1, through to N) reference value, setting the value of A N-n to a second binary value, and generating an address; wherein the reference value generator provides the address generator with 1/2 of the perpendicular component data as a first reference value of the N reference values, if the value of A N-n is equal to the first binary value and the reference value generator provides the address generator with 3/2 of the perpendicular component as the first reference value of the N reference values if the value of A N-n is equal to the second binary value.