Patent ID: 6628276
Filing Date: 2003-09-30
Classification: G09G,H03L,H04N

Abstract:
A system for high precision measurement of a phase difference between two signals, the system comprising:a first input for receiving a first signal with a first edge; a second input for receiving a second signal with a second edge; a first delay chain comprising a first at least one delay element, the first delay chain electrically coupled to the first input such that the first signal is delayed across the first at least one delay element, each of the first at least one delay element comprising an output tap; a second delay chain comprising a second at least one delay element, the second delay chain electrically coupled to the second input such that the second signal is delayed across the second at least one delay element, each of the second at least one delay element comprising an output tap; and at least one set of symmetrical combinational logic gates arranged as a symmetrical Flip-Flop, each of the at least one Flip-Flop including a first and second input electrically coupled to an output tap of each of the first and second at least one delay element, respectively, such that an output of each of the at least one Flip-Flop indicates which of the first edge of the first signal from the output tap of one of the first at least one delay element and the second edge of the second signal from the output tap of one of the second at least one delay element arrived first at the respective first and second input of the at least one Flip-Flop.