Patent · US Expired

Asymmetrical differential amplifier as level converter

US4939478A · kind A · utility

19Cited by

1References

14Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Wolfgang Heimsch · Munich, DE
Ernst Muellner · Munich, DE

Key dates

Filing date	Dec 12, 1988
Grant date	Jul 3, 1990
Priority date	—
Expiry date	Dec 12, 2008

Classification

Technology area (CPC H)Electricity
CPC primaryH03K19/017527
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

An asymmetrical differential amplifier as a level converter has two transistors, a constant current source and two resistors, whereby the first transistor is a MOS transistor and the second transistor is a bipolar npn transistor. Input signals having CMOS level can be applied to an input on the input side of the differential amplifier, whereas output signals having ECL level can be taken at an output. In addition to being a differential amplifier, the circuit also produces a level conversion between CMOS level at the input side and ECL level at the output side.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.