Patent ID: 9104181
Filing Date: 2015-08-11
Classification: G04F,H03L,H03M

Abstract:
1. A time-to-digital converter comprising: a first gated ring oscillator comprising a plurality of first delay cells connected in a cyclic structure, the first delay cells operating in response to an enable signal; a second gated ring oscillator comprising a plurality of second delay cells connected in a cyclic structure, the second delay cells operating in response to the enable signal; a phase adjusting unit configured to adjust a phase of a second circulation signal circulating in the second gated ring oscillator so as for the second circulation signal to have a predetermined phase difference with respect to a first circulation signal circulating in the first gated ring oscillator; and a digital converter unit configured to sample output signals of the first delay cells and the second delay cells to output a digital value corresponding to duration of the enable signal.