Millimeter-wave Satellite Receiver To Send And Receive Rf Circuit Design

Owing to emergency of frequency spectrum resource crsis nowadays, research about electrical system in the field of communication, radar-guidance, electronic countermeasure and remote sensing has been widely developed in the millimeter wave frequency band. As for millimeter wave communication system, it is generally required to have good performance of frequency stability and spectral purity. In addition, miniaturization is also needed in some given environment. Based on this point, the thesis is just about an attempt of developing the transmitting and receiving equipment used in the satellite communication, which have very low phase noise and spur capability.For the receiver and transmitter in millimeter wave band, local oscillator is always a key problem in communication system and has the direct influence of system. So, it is often realized by using frequency synthesis technology. Because of the harmonic wave and parasitic frequency composition which are difficult to reject, direct frequency synthesis is usually not adopted. Despite being widely used, digital frequency synthesis has to face the problem of upper frequency limit and spur. Therefore, the frequency synthesizer works in millimeter wave band is mostly designed and realized by the way of indirect phase lock frequency synthesis, based on specific integrated circuit. According to the demands of thesis, this paper makes deep study about scheme of current transmitters and receivers firstly. Then the scheme of this thesis is introduced, and the feasibility is also proved, by designing and realizing of local oscillator system of the transmitter.After researching correlative theory particularly, we adopt a kind of new scheme of frequency conversion using single local oscillator to achieve double-conversion as the scheme of transmitter. It simplifies the realization of local oscillator and at the same time retains the advantages of traditional double-conversion system. This scheme is favorable in system miniaturization and integration, in which the two local oscillator are got by making frequency multiplication to a phase-locked oscillator. For very high request of phase noise performance, realization of the phase locking frequency source becomes key issue of thesis. In the process of designing, noise model of phase locked loop (PLL) is analysed; component selection and parameter simulation of submodule are also performed elaborately. Based on reduplicate hardware debugging, the transmitter possesses excellent phase noise capability at last and testing result is achieved at the same time.Finally, the transmitter introduced in this thesis can modulate the signal of 0.95~1.45GHz up to millimeter wave band. The phase noise performances of output signal are better than -81dBc/Hz@1kHz, -88dBc/Hz@10kHz, -103dBc/Hz@100kHz, -115 dBc/Hz@1MHz and spur is lower than -55dBc. At the end of paper, aiming at shortcoming of thesis, some corrective measures are proposed. And together with the design method introduced in paper, there are considerable reference value to future scientific research work.