| The development of broadband wireless system and millimeter-wave radar have raised the Monolithic Microwave Integrated Circuits(MMICs) technology advancement. MMIC technology can reduce costs, improve performance and system stability, which make it very attractive. Therefore, the technology of Monolithic Microwave Integrated Circuits(MMICs) have been widely used in radar, communication, electronic warfare and smart weapon. Power amplifier was a key component in millimeter-wave communication system, several monolithic power amplifiers which demonstrated very good millimeter-wave performance for such applications.were developed.Microwave integrated amplifiers mainly have two categories: monolithic microwave integrated circuit (MMIC) amplifiers and hybrid microwave integrated (HMIC) amplifiers. Compared with the HMIC amplifiers, monolithic millimeter-wave integrated circuits (MMICs) offer a better potential to reduce cost, enhance performance, and improve the reliability of systems, but MMIC amplifiers which possess small size, high yield also lead to its limited topological structure, increase matching losses,make the performance worse and so on. However, in millimeter-wave band, due to machining accuracy and other reasons, HMIC amplifiers in performance and reliability are usually poor, even not allowed to use, while MMIC amplifiers can often get better performance and reliability.With the development of millimeter-wave band of communication system, high frequency, high stability and good phase characteristics of millimeter-wave system sources are the keys to success, several millimeter-wave oscillators using frequency multipliers have tight frequency. Compared with millimeter-wave oscillators, millimeter-wave multipliers could provide better reliability and accuracy, generate lower phase noise, better fundamental rejection isolation, they offer signal source with high quality for millimeter-wave system. Many high-performance millimeter-wave frequency multipliers have been developed.This paper focuses on the design of power amplifiers and frequency doublers operating in microwave frequency ranges and a power amplifer operating in U band and a doubler operating in W band were designed. The power amplifer was consisted of three stages. More than 11dB power gain and not less than 12dB 1dB Compression point and less than -11dB Input/Output Return Loss were achieved over the 37GHz to 49GHz frequency band for 6dBm input power, and 27.9% relative bandwidth and 1.90mm×1.21mm size were achieved. In order to reject the fundamental and third harmonic signal over a broadband frequency range, a passive balun was employed in the broadband frequency doubler which has resulted in fundamental signal and third harmonics signal rejection better than 20dBc from 36.5GHz to 49GHz input frequency for 18.5dBm input power, the typical conversion loss is approximately 8dB, and 27.9% relative bandwidth and 1.30mm×1.29mm size are gained. The design was accomplished on 0.15um GaAs PHEMT MMIC process. |
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