发明名称 |
APPARATUS AND METHODS FOR POWER AMPLIFIER BIAS CIRCUITS |
摘要 |
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. |
申请公布号 |
US2016248386(A1) |
申请公布日期 |
2016.08.25 |
申请号 |
US201615144515 |
申请日期 |
2016.05.02 |
申请人 |
SKYWORKS SOLUTIONS, INC. |
发明人 |
Lam Lui |
分类号 |
H03F1/30;H04W52/52;H03F3/21;H03F3/19;H03F1/34 |
主分类号 |
H03F1/30 |
代理机构 |
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代理人 |
|
主权项 |
1. A power amplifier system comprising:
a power amplifier stage configured to receive a bias voltage that biases the power amplifier stage; 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, the one or more selected reference bipolar transistors having a current therethrough that changes in relation to the bias voltage; and a transimpedance amplifier configured to control the 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. |
地址 |
Woburn MA US |