| 摘要 |
<p>A linear power amplifier utilizes active feedback pre-distortion linearization. The power amplifier is a two-stage amplifier which includes a pre-distortion active feedback driver amplifier and a power amplifier. The driver amplifier provides gain expansion and insertion phase decrease as input power is increased, which compensates for the output power amplifier's gain compression and insertion phase increase with input power, resulting in a two-stage amplifier with relatively higher linear power output power capability and associated power-added efficiency. The two-stage linear power amplifier in accordance with the present invention provides improved linear efficiency which can be mass-produced in high volume with excellent repeatability. A voltage bias circuit with an external voltage post enables the two-stage amplifier to be tuned with an external voltage for optimum performance. <IMAGE></p> |
