| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 101 === This thesis composed of two parts. One is a power amplifier with low phase modulation variation for an Envelope Elimination and Restoration transmitter. The other is a power amplifier with high output power for a k-band high-power system. With a power-combining transformer, the limited output power of a power amplifier in CMOS process can be increased.
The frequency of the first power amplifier is 2.4 GHz, which is the same with the frequency of Bluetooth systems. In order to fix the phase modulation variation problem in the most power amplifiers in EER systems, two varactors are adapted to compensate the variation of the parasitic capacitor. The parameters are measured as below: The maximum output power is 18.03 dBm. The peak power-added efficiency is 40.04 %. The variation of output phase is 3.1 degrees.
The frequency of the second power amplifier is 24 GHz, which is the operating frequency of automotive radar system. The structure of the class-AB power amplifier is cascode and differential. In order to increase the output power, the output power of two power amplifier is combined with a transformer-based power combiner. The combiner structure is novel “Figure 8” structure, which is capable of combining the power, converting a differential signal to a single-ended signal, transforming the load impedance, and supplying the drain bias. The parameters are simulated as below: The saturated output power is 22.83 dBm, which is higher than the most published works. The peak power-added efficiency is 11.96 %. The gain is 16.37 dB.
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