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A quad-band GSM/GPRS power amplifier module is designed with a built-in ability of RF power transmitting control. Within the RF power transmitting control loop, a RF power detecting circuit with another reference circuit are embedded together onto the same InGaP/GaAs HBT power amplifier chip to achieve a good temperature compensation. Such power chips are then assembly with a silicon CMOS comparative...
A precise modeling method for thermal memory effect has been proposed. The proposed method consists of a multi-stage thermal RC-ladder network, which has been replaced from heat diffusion equation. Different from conventional method, the proposed method is valid for both steady state solutions and transient solutions. As examples, output voltage transient phenomena and 3rd order inter modulation distortion...
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