发明公开
EP2097985A1 CURRENT CONTROLLED BIASING FOR CURRENT-STEERING BASED RF VARIABLE GAIN AMPLIFIERS 审中-公开
电流型工作项目设置可变增益设置RF放大器

CURRENT CONTROLLED BIASING FOR CURRENT-STEERING BASED RF VARIABLE GAIN AMPLIFIERS
摘要:
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.
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