Voltage and temperature compensation circuitry for current mode logic
US3970876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1975 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Aug 14, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/14
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved CML (Current Mode Logic) gate having voltage and temperature compensating means for maintaining output levels and input thresholds invariant with fluctations in supply voltage and junction temperature. The output of the compensating means, measured with respect to ground, will track variations in supply voltage on a one-to-one basis except that the output is allowed to vary by one V.sub.be with junction temperature. This output is supplied to the base of the constant-current source transistor which feeds the differential amplifier stage of the CML gate and to the base of a constant current source transistor whose collector is coupled to the base of the non-input transistor of the differential amplifier stage of the CML gate. The compensating circuitry includes an output transistor, resistive means for tracking variations in supply voltage, and a temperature compensation network having a temperature compensation factor of zero, both said resistive means and the output of said temperature compensation network are coupled to the base of the output transistor. The temperature compensation network achieves an overall compensation factor of zero by combining a temperature com…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.