| Summary: | 碩士 === 國立中央大學 === 通訊工程研究所 === 93 === Recently, since the booming of wireless communication and multi-media services are getting popular, new applications such as wireless multi-media demands much fast speed and wide bandwidth. RF circuit design is one of the key technologies of the wireless communication system. The key components, such as RF amplifier, filter, mixer, and oscillator, are the most fundamental elements of the wireless system. Thus, the RF circuit technologies play an important role in the development of the wireless system. This thesis divides into two parts. The first part is the VCO design using 2.0mm InGaP HBT and pHEMT 0.15mm processes. The VCO design includes 5.5 /14 GHz voltage controlled oscillator (VCO). The second part is the 2.4 GHz filter on FR4 PCB. Hairpin and Ring-Couple filters are designed and implemented.
The VCO chips were performed on-chip measurement. The 5.5 GHz VCO obtained the phase noise of -85 dBc/Hz at 100 KHz offset, the tuning ranges of 500 MHz, and the output power of –6 dBm. The chips’ area are compact as 1.5×1 . The resulting power consumption is about 90 mW at the 3.5 V power supply. The 14 GHz VCO obtained the phase noise of -80 dBc/Hz at 100 KHz offset, the tuning range of 1000 MHz, and VCO’s output power of -2dBm. The chips area were 1.5×1 . The resulting power consumption is about 120 mW at the 2.2 V power supply.
In second part, S-parameters of the filters were measured using vector network analyzer. From the measurement result, center frequency, return loss and fractional bandwidth are about 2.4 GHz, -10 dB and 10, respectively. The measured results are good agreement with the theoretical predictions.
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