Class B power buffer with rail to rail output swing and small deadband
US6710660B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Sep 17, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45676
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit is arranged as a class B amplifier with a rail-to-rail output swing and a small deadband. The circuit has two parallel input stages that each use an amplifier configured as a unity gain voltage follower. The output of each stage drives a high current output transistor. The output transistors are complementary transistors arranged in a common source configuration. The common source configuration operates as a complementary class B amplifier, which conducts no quiescent bias current. An offset voltage is introduced in each input stage, which creates a small deadband in the output voltage as it switches between sinking current and sourcing current. The offset voltage is selected to ensure that the output transistors are not both simultaneously activated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.