Designs Of Frequency Dividers In Millimeter-Wave All-Digital Phase Locked Loops

With the rapid development of technologies such as satellite communication and automotive radar,millimeter wave communication technology has broad application prospects in various fields such as military and civil.The millimeter wave frequency synthesizer is a key module in the millimeter wave communication system,and its performance directly determines the level of communication quality.The millimeter wave broadband frequency divider is one of the key modules in the millimeter wave digital frequency synthesizer.Its function is to divide the output signal of the DCO and obtain a stable local oscillator signal.The frequency divider is one of the most critical parts of the millimeter wave frequency synthesizer,its performance has a great impact on the entire frequency synthesizer,especially the performance of the operating speed,frequency division range,frequency division ratio,power consumption and phase noise.In this design,the frequency divider in the millimeter wave frequency synthesizer is the research topic.The integer frequency division of the mode 80 is designed for the millimeter wave frequency synthesizer: injection locked frequency divider,current mode logic frequency divider and a mode twenty integer frequency divider composed of dual-mode frequency divider and asynchronous frequency divider.The main work of this dissertation can be summarized as follows:(1)By studying the mathematical model of the locking range,the resonant cavity of the ordinary direct injected injection locked frequency divider is improved: the single resonant cavity is changed to the coupling mode of the two resonant cavity to reduce the equivalent capacitance value,and get higher frequency and wider bandwidth than direct injection divider.Based on the electromagnetic simulation software,the size and quality factor of the passive inductor are independently designed and optimized.The test results show that the free oscillation frequency of its LC resonance network is 39 GHz.When the power of the injected signal is 0d Bm,it can reach the frequency division range of 68-88 GHz.The core circuit chip area is 0.12 mm × 0.14 mm,and the phase noise does not exceed-110.19 d Bc / Hz at a frequency deviation of 1MHz.(2)The logic structure of different dynamic current modes and select the frequency divider of Razavi structure is analyzed and chosen as the second-stage frequency divider.And by optimizing the circuit size and using pseudo-symmetric layout design for the first time,without using any passive components such as peaking inductors,the working frequency of the Razavi structure twofrequency divider is increased to above 45 GHz.The test results show that the Razavi structure dynamic current mode logic frequency divider in this design achieves a high-performance millimeter wave broadband frequency division with a working frequency of 19-48 GHz,an input sensitivity of-35 d Bm,and a maximum DC current of 9.34 m A.(3)Inspired by the common dual-mode frequency divider based on trigger and logic control,a mode 20-degree frequency divider was designed.It replaces the synchronous twisted ring counter type frequency divider with complicated circuit structure.Through the research and design of the logic principle of the dual-mode frequency divider and the asynchronous frequency divider,the mode 20 frequency with high frequency division frequency and wide frequency division range.Test results indicate that normal frequency division can be achieved at 17-22 GHz.