Apparatus and methods for power amplifier bias circuits
US9608576B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 2016 |
| Grant date | Mar 28, 2017 |
| Priority date | — |
| Expiry date | May 2, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods for power amplifier bias circuits are disclosed herein. In certain implementations, a power amplifier bias circuit includes a current source configured to generate a reference current, a plurality of reference bipolar transistors, a selection circuit configured to select one or more selected reference bipolar transistors from the plurality of reference bipolar transistors, and a transimpedance amplifier. The one or more selected reference bipolar transistors have a current therethrough that changes in relation to a power amplifier stage bias voltage, and the transimpedance amplifier is configured to control the power amplifier stage bias voltage based on an error current corresponding to a difference between the reference current and the current through the one or more selected reference bipolar transistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.