ECL/CML emitter follower current switch circuit
US4943741A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1989 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | May 24, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/66
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An emitter follower current switch circuit is provided for emitter coupled logic or current mode logic (ECL/CML) circuits having output buffer emitter follower transistor elements which source true and complementary output signals of high and low potential to respective true and complementary outputs of the ECL/CML gate. The emitter follower current switch circuit effectively disconnects the output current sink from and ECL/CML gate output and corresponding output buffer emitter follower transistor element when the corresponding output is at high potential. At each output a current switch transistor element is coupled between the respective output buffer emitter follower transistor element and the output current sink. A control circuit controls the conducting state of the current switch transistor element so that it is on (conducting) or off (non-conducting) for corresponding output signals of low and high potential respectively. Cross control circuits are provided so that the current switch transistor element for the true output is controlled by the complementary output signal potential level and the current switch transistor element for the complementary output is controlled by t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.