Time counting circuit, sampling circuit, skew adjusting circuit,

Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude

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327 93, 327 94, 327 95, 327 96, 327 77, H03K 190175

Patent

active

059202092

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: 5410269 (1995-04-01), Ohie et al.
patent: 5481212 (1996-01-01), Shima
patent: 5625304 (1997-04-01), Azadet et al.
patent: 5659497 (1997-08-01), Ueno et al.
patent: 5666075 (1997-09-01), Schinzel
Technical Report of Ieice, "A Time-to-Digital Converter LSI", IDC 93-77, pp. 37-43, 1993-08.

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