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. 19, 1991
Filed:
Jul. 02, 1990
M Nghiem Phan, Mesa, AZ (US);
Robert D Berger, Chandler, AZ (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A high speed voltage translator is responsive to an ECL input signal for providing a TTL output signal at an output while clamping the low output voltage thereof to a predetermined value. The ECL input signal is converted to first and second complementary control signals for driving the upper and lower transistors in the output stage, respectively. The second control signal enables a third transistor, the base of which is connected via a serial diode and resistor combination to a second collector of the lower transistor in the output stage. The base-emitter junction potential of the third transistor cancels the potential across the diode whereby the collector of the lower transistor that is the output of the voltage translator is clamped at one base-emitter junction potential less the voltage across the resistor. Furthermore, the current flowing through the resistor is compensated for temperature variation whereby the low output voltage is independent of temperature. The first and second control signals enable separate charge and discharge paths for the upper and lower transistors whereby the associated propagation delays may be controlled so as to inhibit simultaneous conduction through the output stage.