发明名称 |
APPARATUS AND METHODS FOR MULTI-MODE LOW NOISE AMPLIFIERS |
摘要 |
Apparatus and methods for multi-mode low noise amplifiers (LNAs) are provided herein. In certain configurations, a radio frequency (RF) system includes a multi-mode LNA including at least a first amplification stage and a second amplification stage electrically connected in a cascade. The RF system further includes a mode control circuit, which receives a mode selection signal and controls the biasing of the first and second amplification stages based on the mode selection signal. The mode control circuit operates the multi-mode LNA in one of a plurality of modes including both a first mode in which the LNA operates with higher gain and better noise figure and a second mode in which the LNA operates with lower gain and higher linearity. Controlling the mode of the multi-mode LNA using the mode selection signal allows the multi-mode LNA to advantageously achieve both the benefits of low noise figure and high linearity. |
申请公布号 |
US2016248378(A1) |
申请公布日期 |
2016.08.25 |
申请号 |
US201514752552 |
申请日期 |
2015.06.26 |
申请人 |
ANALOG DEVICES, INC. |
发明人 |
Zhang Cemin |
分类号 |
H03F1/02;H03F3/19;H03F1/56 |
主分类号 |
H03F1/02 |
代理机构 |
|
代理人 |
|
主权项 |
1. A low noise amplification system comprising:
a multi-mode low noise amplifier (LNA) comprising two or more amplification stages, wherein the two or more amplification stages comprises a first amplification stage and a second amplification stage electrically connected in a cascade; and a mode control circuit configured to receive a mode selection signal, wherein the mode control circuit is configured to control the multi-mode LNA to a selected mode chosen from a plurality of modes based on a state of the mode selection signal, wherein the plurality of modes includes a first mode and a second mode, wherein the multi-mode LNA operates with lower noise figure and greater total gain in the first mode relative to the second mode, and wherein the multi-mode LNA operates higher linearity in the second mode relative to the first mode. |
地址 |
Norwood MA US |