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:
Nov. 17, 1992
Filed:
Oct. 18, 1990
Richard A Summe, Kokomo, IN (US);
Delco Electronics Corporation, Kokomo, IN (US);
Abstract
This invention relates to a waveshaping circuit for producing a bus output voltage signal having a substantially sinusoidal rising transition from a low voltage level to a high voltage level in response to the rising edge of a data input signal, and a substantially sinusoidal falling transition from said high voltage level to said low voltage level, in response to the falling edge of said data input signal. The circuit uses AC coupling to control the waveshaping. This allows the circuit to operate with a large ground offset voltage difference between circuit ground and bus ground. An exponential current source provides a current to a regulator bus driver which charges and discharges a capacitor in response to the the rising edge or falling edge on the data input signal. The current increases exponentially in response to the rising or falling edge on the data input signal and then decreasing exponentially when the bus output signal reaches one-half of its intended full voltage swing or falls below one-half the full voltage swing to respectively produce the sinusoidal rising and falling voltage at the bus output. The regulator bus driver regulates the voltage at the bus output when the voltage reaches the intended full voltage. The regulator bus driver circuit creates it own regulated high voltage level over supply variations from 9-16 volts.