Time counting circuit, sampling circuit, skew adjusting circuit,

Details Time counting circuit, sampling circuit, skew adjusting circuit, Time counting circuit, sampling circuit, skew adjusting circuit,

1998-06-18

1999-10-26

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327152, 327153, 327155, 327161, 327296, H03L 700

Patent

active

059735236

ABSTRACT:
There is provided a time counting circuit which measures a pulse spacing of a pulse signal with a high accuracy and exhibits high resistance to variations in power-source voltage.
A delay circuit ring consists of a plurality of delay circuits connected in a ring configuration and signal transition is caused to circulate around the delay circuit ring by oscillation. A switch-signal generating circuit outputs first and second switch signals based on the time at which a pulse signal to be measured rises. A row of sampling circuits consists of a plurality of sampling circuits connected to the output terminals of the respective delay circuits and samples the output signals from the delay circuits in response to a direction indicated by the first switch signal. A row of holding circuits consists of a plurality of holding circuits connected to the output terminals of the respective sampling circuits and holds the output signals from the sampling circuits in response to a direction indicated by the second switch signal. An operating circuit calculates the pulse spacing of the pulse signal to be measured based on a logic level signal outputted from the row of holding circuits.

REFERENCES:
patent: 5578946 (1996-11-01), Carberry et al.
patent: 5719511 (1998-02-01), Le Cornec et al.
patent: 5745533 (1998-04-01), Asada et al.
Technical Report of IEICE, "A Time-to-Digital Converter LSI", IDC 93-77, pp. 37-43, 1993-08.

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