Abstract
ABSTRACT For the military radar, rapid detection and reaction are the primary purpose. traditional mechanical scanning radar needs to rotate the way, limited information update rate can be reached, so now the mainstream radar can use electronic control phased array radar, using the changed waveform phase manner, the formation of object orientation constructive interference radar, accurate and effective targeted. This paper presents a CMOS chip design can use phase-locked loop for digital signal control mechanisms phase, this group of digital signals to digital-to-analog converter generates an analog control signals to control the voltage controlled oscillator plus a variable capacitor, When this set of variable capacitance change capacitance, the loop to lock back to the original frequency, will change the original VCO control voltage change leisurely loop control variable value, where the use of this change of control voltage to move phase, using exclusive-OR gate to cause the mobile phase. Because of the design it is to belong to the active phased array radar, so there will be phase-locked loop and power amplifier on a CMOS wafer simultaneously, thus being in the loop, in order to avoid the mutual influence of the two, to avoid being in a phase-locked loop harmonic frequency power amplifier, so in addition to using a frequency divider-by-1.5, and the design of such frequency divider unable to reach a 50% duty cycle, so before the first exclusive or gate to the phase frequency detector to compare the frequency, the purpose of changing the phase is completed. This paper is divided into five chapters, the first chapter introduces the research motivation of this article, the sub-circuit principle ministries and analysis of the second chapter of the phase-locked loop, the third chapter describes 35GHz current pump type phase-locked loop of the actual design and simulation results and circuit design and simulation circuit layout, the fourth chapter was added linear phase shift of the phase-locked loop; and finally make a conclusion in the fifth chapter, and summarizes proposed future prospects.