Source: http://www.google.com/patents/US5410278?dq=U.S.+Patent+No.+4,528,643
Timestamp: 2014-03-11 08:12:53
Document Index: 314411217

Matched Legal Cases: ['art.\n7', 'art 12', 'art 13', 'art 12', 'art 12', 'art 12']

Patent US5410278 - Ring oscillator having a variable oscillating frequency - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA ring oscillator includes a plurality of inverters, a leakage current generating part, and a current controlling part. The current controlling part supplies the inverters with a source current in accordance with a value of a leakage current generated from the leakage current generating part. The leakage...http://www.google.com/patents/US5410278?utm_source=gb-gplus-sharePatent US5410278 - Ring oscillator having a variable oscillating frequencyAdvanced Patent SearchPublication numberUS5410278 APublication typeGrantApplication numberUS 07/992,579Publication dateApr 25, 1995Filing dateDec 18, 1992Priority dateDec 19, 1991Fee statusPaidPublication number07992579, 992579, US 5410278 A, US 5410278A, US-A-5410278, US5410278 A, US5410278AInventorsMakoto Ihara, Nobuhiko ItohOriginal AssigneeSharp Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Non-Patent Citations (2), Referenced by (59), Classifications (16), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetRing oscillator having a variable oscillating frequencyUS 5410278 AAbstract A ring oscillator includes a plurality of inverters, a leakage current generating part, and a current controlling part. The current controlling part supplies the inverters with a source current in accordance with a value of a leakage current generated from the leakage current generating part. The leakage current generated from the leakage current generating part is correlated with a leakage current generated from a memory cell. The oscillating frequency of the ring oscillator can be varied in accordance with the leakage current generated from the leakage current generating part.
7. A ring oscillator according to claim 6, wherein the n-type diffusion region is formed as an n.sup.+ well.
8. A ring oscillator according to claim 6, wherein the n-type diffusion region is formed as an n.sup.- well.
As is shown in FIG. 2a, the leakage current generating part 12 comprises a p-type semiconductor substrate 12a and an n-type diffusion region 12b. A voltage is applied in a reverse direction to the n-type diffusion region 12b via the current controlling part 13. The n-type diffusion region 12b is connected to a node 13d where the potential is detected via a node 15 where the charge is stocked. A leakage current generated from the leakage current generating part 12 is correlated with a leakage current generated from a memory cell. The leakage current generated from the leakage current generating part 12 flows in a direction from the n-type diffusion region 12b to the p-type semiconductor substrate 12a. The correlation between the leakage current (IL1) generated from the leakage current generating part 12 and the leakage current (IL2) generated from the memory cell is shown in FIG. 2b. The n-type diffusion region 12b is preferably formed as an n.sup.+ well or n.sup.- well.
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StoiberRing based impedance control of an output driverUS20110101998 *Nov 3, 2009May 5, 2011Arm LimitedOperating parameter monitoring circuit and method* Cited by examinerClassifications U.S. Classification331/57, 365/227, 365/222, 331/65International ClassificationH03K3/03, H03K3/354, H03K3/011, G11C11/406Cooperative ClassificationG11C11/406, H03K3/011, H03K3/354, H03K3/0315European ClassificationH03K3/03D, H03K3/011, G11C11/406, H03K3/354Legal EventsDateCodeEventDescriptionSep 29, 2006FPAYFee paymentYear of fee payment: 12Aug 29, 2002FPAYFee paymentYear of fee payment: 8Oct 19, 1998FPAYFee paymentYear of fee payment: 4Aug 22, 1995CCCertificate of correctionDec 18, 1992ASAssignmentOwner name: SHARP KABUSHIKI KAISHA, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:ITOH, NOBUHIKO;IHARA, MAKOTO;REEL/FRAME:006365/0995Effective date: 19921202RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google