发明名称 |
SMART LINEARIZED POWER AMPLIFIER AND RELATED SYSTEMS AND METHODS |
摘要 |
A power amplifier subsystem that includes a first stage amplifier and a second stage amplifier. A first bias circuit is coupled to the first stage amplifier, and the first bias circuit has a variable impedance that increases with radio frequency (RF) power. A second bias circuit is coupled to the second stage amplifier, and the second bias circuit has impedance relatively fixed with respect to radio frequency (RF) power. According to an embodiment of the invention, the first bias circuit comprises a transistor having a collector current that increases as radio frequency (RF) power increases. The second bias circuit can have a relatively fixed impedance. A method of designing an amplifier subsystem, where transistor size and resistor values are selected to obtain the desired bias and linearity characteristics, or transistor size and resistor values are selected to operate within a selected range, and amplifier performance is adjusted by changing the bias control voltage. |
申请公布号 |
WO2004105231(A3) |
申请公布日期 |
2008.11.20 |
申请号 |
WO2004US15856 |
申请日期 |
2004.05.19 |
申请人 |
EPIC COMMUNICATIONS, INC.;YUEN, CINDY;LAURSEN, KIRK;CHU, DUC |
发明人 |
YUEN, CINDY;LAURSEN, KIRK;CHU, DUC |
分类号 |
H03G5/16;H03F1/02;H03F1/32 |
主分类号 |
H03G5/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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