| 摘要 |
PROBLEM TO BE SOLVED: To easily recalculate and remeasure propagation delay and also to easily deal with the dispersion or secular change of an analog element by monitoring the propagation of the inputted arbitrary data at an output point of a signal propagation system, detecting the delay between input and output and processing digitally this delay to calculate the delay time of the signal propagation system. SOLUTION: An optional pattern transfer circuit 1 sends an arbitrary pattern to a switch 7. A switch 6 cuts a path set between a signal input terminal 99 and a circuit 8 that is to be measured by means of the switch signal sent from a control circuit 5. A clock circuit (CLK) 4 inputs a time reference clock signal to a time measuring circuit 3 and starts the measurement of time, in response to the start signal of a pattern detection circuit 2. The circuit 2 keeps its operation until it detects the pattern that is transferred from the circuit 1 and notifies the circuit 3 of the end of the measurement, when the pattern is detected. The circuit 3 counts the input frequency of the time reference clock signal and obtains the value that is proportional to the propagation delay time of the circuit 8. |
