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. 16, 1982
Filed:
Jul. 25, 1980
Applicant:
Inventors:
Ramanatha V Balakrishnan, Santa Clara, CA (US);
William R Fowler, Sunnyvale, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
375 36 ; 307270 ; 307263 ; 328127 ;
Abstract
A data bus transceiver reduces self-induced noise by using trapezoidal drive waveforms. A differential receiver stage of the transceiver has a threshold voltage matched to the midpoint voltage of the drive waveform to reduce distortion, and a low-pass filter matched to the slew rate of the drive waveform to reduce noise while causing minimum progation delay. The transceiver has been integrated using back-to-back junction capacitors in the driver and filter circuits and these capacitors have been biased to reduce their variation in capacitance as a function of the voltage applied across them.