Bias circuit for supplying a bias current to a RF power amplifier
US10141892B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2017 |
| Grant date | Nov 27, 2018 |
| Priority date | — |
| Expiry date | Jul 31, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/0202
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A bias circuit for supplying a bias current to a RF power amplifier by using at least two voltage reference circuits coupled between the base terminal of a bipolar transistor and a voltage supply for generating a bias current to the RF power amplifier, wherein each of the at least two voltage reference circuits respectively clamps to a reference voltage at a corresponding terminal node of the voltage reference circuit on a conductive path having a current flowing from the voltage supply to the base terminal of the bipolar transistor, wherein when the current flowing out of the voltage supply increases, the current flowing through each of the at least two voltage reference circuits will also increases, so that the variation range of the bias current to the RF power amplifier will be kept in a smaller range compared with the variation range of the current flowing out of the power supply, thereby increasing the linearity of the RF power amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.