Patent · US Expired

Ring oscillator

US4771251A · kind A · utility

12Cited by

1References

6Claims

0Family size

Assignee

Control Data Corporation · US

Inventors

David H. Allen · Rochester, US
Michael Maas · Schnorbach, DE

Key dates

Filing date	Oct 23, 1987
Grant date	Sep 13, 1988
Priority date	—
Expiry date	Oct 23, 2007

Classification

Technology area (CPC G)Physics
CPC primaryG01R31/318552
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An improved ring oscillator for VLSI chips is shown, formed at the chip periphery. It may have specific initiation gates and have additional parasitic capacitance added to the ring to enhance accuracy. The circuit elements used for the ring are the same as those used for more centralized circuits.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.