Patent ID: 8335290
Filing Date: 2012-12-18
Classification: H03L,H04L

Abstract:
1. A receiving circuit comprising: a clock generation circuit that generates four clock signals having respective pulse periods of 90 degrees, the pulse periods being different from each other by 90 degrees and one cycle being associated with 360 degrees; an integration filter that generates a first storage potential, a second storage potential, a third storage potential, and a fourth storage potential based on potentials of an input signal in the corresponding pulse periods of the clock signals; an arithmetic-operation circuit that generates an arithmetic-operation potential by performing an arithmetic operation on two selected ones of the first storage potential, the second storage potential, the third storage potential, and the fourth storage potential; an analog-to-digital circuit that converts the arithmetic-operation potential into a digital value; and a data determination circuit that determines a logic of the input signal on a basis of the digital value, wherein the arithmetic-operation potential generated by the arithmetic-operation circuit comprises a first arithmetic-operation potential, a second arithmetic-operation potential, a third arithmetic-operation potential, and a fourth arithmetic-operation potential, each arithmetic-operation potential being obtained by performing an arithmetic operation on a combination of two different ones of the first storage potential, the second storage potential, the third storage potential, and the fourth storage potential; the digital value comprises a first arithmetic-operation digital value, a second arithmetic-operation digital value, a third arithmetic-operation digital value, and a fourth arithmetic-operation digital value corresponding to the first arithmetic-operation potential, the second arithmetic-operation potential, the third arithmetic-operation potential, and the fourth arithmetic-operation potential; the receiving circuit further comprises a phase detection circuit that detects a difference of phases of the clock signals relative to a phase of the input signal on a basis of the first arithmetic-operation digital value, the second arithmetic-operation digital value, and the third arithmetic-operation digital value or on a basis of the first arithmetic-operation digital value, the third arithmetic-operation digital value, and the fourth arithmetic-operation digital value and that outputs an information signal having a logic corresponding to the phase difference; and the clock generation circuit adjusts the phases of the clock signals in accordance with the information signal.