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:
Mar. 01, 1994
Filed:
Jan. 12, 1993
Travis N Blalock, Santa Clara, CA (US);
Thomas Hornak, Portola Valley, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A bucket brigade analog delay line with voltage limiting feedback includes an input stage for receiving an input signal and a series of delay stages coupled to the input stage for propagating the input signal through the line. Each delay stage contains a storage capacitor for holding either a signal charge or a reference charge, a transfer device for transferring charge from one stage to another at regular clock intervals, and a tap circuit for allowing external sampling of the propagated input signal. Each delay stage also includes a negative feedback amplifier for maintaining the drain terminal of the transfer device at a constant potential during charge transfer, thereby eliminating errors caused by finite output impedance of the transfer device. The negative feedback amplifier also prevents overvoltage conditions which could result in failure of the charge transfer devices.