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:
Dec. 27, 2005
Filed:
Jun. 18, 2004
Nikhil K. Srivastava, Woodland Hills, CA (US);
Gopal Raghavan, Thousand Oaks, CA (US);
Carl W. Pobanz, Topanga, CA (US);
Nikhil K. Srivastava, Woodland Hills, CA (US);
Gopal Raghavan, Thousand Oaks, CA (US);
Carl W. Pobanz, Topanga, CA (US);
Inphi Corporation, Westlake Village, CA (US);
Abstract
An output buffer for driving a capacitively-terminated transmission line produces a waveform which comprises a first portion during which the waveform transitions from a voltage Vto a voltage V; a second portion during which it remains fixed at V; a third portion during which it transitions to a voltage V; and a fourth portion during which it remains fixed at V. The waveform is created within a unit interval whenever successive data bits transition between logic states. The first and second portions are generated with circuitry arranged such that Vis maximized by reducing the buffer's output impedance. The fourth portion is generated with circuitry which has a non-zero output impedance preferably equal to the transmission line's characteristic impedance, to absorb transitions reflected back to the source circuitry by the capacitive termination.