Patent ID: 11888499
Assignee: SEIKO EPSON CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 7:
8. The time-to-digital converter according to claim 6, wherein
the trigger signal is defined as a first trigger signal,
the state information is defined as first state information,
the time-digital value is defined as a first time-digital value,
the ring oscillator circuit starts to oscillate, based on a second trigger signal,
the transition-state acquisition section
acquires and holds second state information including the signal output from the ring oscillator circuit and the signal output from the state machine, synchronously with the reference signal after the second trigger signal is input to the ring oscillator circuit,
the internal-state calculation section
calculates the internal state corresponding to a number of changes in state of the ring oscillator circuit, based on the second state information held by the transition-state acquisition section, and
the calculator section
calculates a number of transitions in the internal state and calculates a second time-digital value corresponding to a time event of the second trigger signal, based on the number of transitions, and
calculates a difference between the first time-digital value and the second time-digital value.