The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 1988
Filed:
Apr. 22, 1987
Calvin S Winroth, Acton, MA (US);
GenRad, Inc., Concord, MA (US);
Abstract
A time-measurment circuit (10) employs time-expansion circuits (13 and 14) to expand the initial and final portions of the duration of an event so as to measure more precisely those segments of time that typically are not integral numbers of clock periods in length. Each time-expansion circuit (13 and 14) employs a single capacitor (34), which it charges at a rapid rate during the initial or final time segment to be measured and then discharges at a much lower rate. The clock periods that occur during the time required for charging and discharging are counted, so the initial and final segments are measured with greatly enhanced resolution. An emitter-coupled-logic integrated circuit (54) performs the charging of the capacitor (34) by drawing current through its V.sub.CC1 l terminal ( 62).