| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 91 === In this thesis, we focus on the intermediate frequency module and multiplier module development for the receivers of AMiBA radio astronomy telescope.
The intermediate frequency module is composed of two 2~18 GHz broadband amplifiers and two equalizers. The equalizer is used to compensate for the frequency response in overall receivers. The output of intermediate frequency module is transmitted to correlator for signal processing.
The multiplier module mainly consists of doubler, amplifier, power divider, and 90 degrees phase shifters. There are one input port and two output ports in the multiplier module. The 21GHz local oscillation signal is sent to the input of multiplier module. This signal is then multiplied and amplified to 42GHz signal by the doubler and 42GHz amplifier. A 42GHz power divider is used in order to provide two signals for the two sub-harmonic mixers in each AMiBA receiver. After the power divider, the 42GHz signal is sent to two 90 degrees phase shifters. The phase switching control is conducted by the TTL signal from the system control computer. The two outputs of multiplier are finally sent to two sub-harmonic mixers for mixing the two received RF polarized signals.
Seven intermediate frequency modules and multiplier modules will be integrated and tested with AMiBA receivers. By the end of 2003, the 7-element AMiBA receivers are planned to be installed in Hawaii, USA.
|
|---|
