CMOS class AB amplifier for driving capacitive and resistive loads
US5504458A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Sep 30, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/3001
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The class AB amplifier is configured to provide low quiescent current while achieving high internal switching rates. The buffer is connected to a large external capacitance which provides external compensation. The amplifier includes an input stage which converts differential voltages to current. An output stage provides an output current and also provides a feedback current into the input stage. A biasing network provides voltage for biasing various nodes within the amplifier. Cross-coupling is provided within the output stage for achieving a low quiescent current. A pair of current limiting circuits, one for p-channel element and another for n-channel elements, is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.