| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an amplifier with high linearity and low distortion. <P>SOLUTION: A modified derivative superposition low noise amplifier includes a main current path and a cancel current path. Third-order distortion in the cancel path is used to cancel third-order distortion in the main path. In one novel aspect, there is a separate source degeneration inductor for each of the two current paths, thereby facilitating tuning of one current path without affecting the other current path. In a second novel aspect, a deboost current path is provided that does not pass through an LNA load. The deboost current allows negative feedback to be increased without generating headroom problems. In a third novel aspect, the cancel current path and/or deboost current path is programmably disabled to reduce power consumption and improve noise figure in operational modes that do not require high linearity. <P>COPYRIGHT: (C)2013,JPO&INPIT |
