Full swing BiCMOS amplifier
US5309042A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1993 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Feb 8, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/09448
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A BiCMOS amplifier provides full swing with fast transitions from V.sub.dd to V.sub.ss and from V.sub.ss to V.sub.dd, and therefore has important applications in low voltage BiCMOS VLSI circuits. A bipolar totem pole output transistor pair is connected between a supply voltage, V.sub.dd and ground, V.sub.ss. A fast output transition from V.sub.dd to V.sub.ss is accomplished by extending the conduction range of the pull down bipolar transistor. An n-channel MOSFET is fabricated to provide a 0 V.sub.t pass transistor. The pass transistor is coupled to a first of the bipolar output transistor pair, the pull up transistor, to inject carriers into the base of the output transistor and extend the transistor's conduction, such that the transistor provides a fast output upswing from V.sub.ss to V.sub.dd.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.