Symmetrical analog power amplifier
US6057734A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1999 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Jan 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/72
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A symmetrical analog power amplifier employing CMOS technology comprising an input stage and an improved output stage having a pull up/down arrangement to provide improved operating characteristics. The amplifier includes a pair of input transistors that receive an input signal and a node on which a first output voltage is generated. The amplifier further includes an improved output stage comprising an intermediate current source circuit that includes a first current source transistor, a control transistor and a second current source transistor connected in series. A first output voltage is generated on a node interconnecting the control transistor and the second current source transistor. A second output voltage, which is responsive to the first output voltage, is generated on a node connecting the first current source transistor and the control transistor. The output stage further includes a first output transistor responsive to the first output voltage and a second output transistor responsive to the second output voltage. A third output voltage, which is the output voltage of the amplifier, is generated on an output node interconnecting the first and second output transistors. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.