发明名称 |
CURRENT CONTROLLED BIASING FOR CURRENT-STEERING BASED RF VARIABLE GAIN AMPLIFIERS |
摘要 |
<p>An adaptive current control circuit for reduced power consumption and minimized gain shift in a variable gain amplifier. An automatic gain control circuit provides gain control voltages in response to a gain control signal. The gain control voltages are used by the variable gain amplifier to set the gain of the output signal for wireless transmit operations. The adaptive current control circuit receives the same gain control voltages for reducing current to the variable gain amplifier during low gain operation, while providing higher currents during high gain operation. The current that is provided is a hybrid mix of proportional to absolute temperature (PTAT) current and complementary to absolute temperature (CTAT) current for minimizing temperature effects on the gain. The ratio of PTAT current and CTAT current is adjustable for specific temperature ranges to further minimize temperature effects on the gain.</p> |
申请公布号 |
EP2097985(A1) |
申请公布日期 |
2009.09.09 |
申请号 |
EP20070855611 |
申请日期 |
2007.12.20 |
申请人 |
ICERA CANADA ULC |
发明人 |
EMBABI, SHERIF H.K.;BELLAOUAR, ABDELLATIF;FRECHETTE, MICHEL J.G.J.P. |
分类号 |
H04B1/04;H04B7/005 |
主分类号 |
H04B1/04 |
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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