Research On Voltage Controlled Oscillators And Frequency Dividers Implemented In Silicon-based Millimeter Wave Frequency Sources

In Millimeter-wave circuit chips,the performance of the frequency source is crucial to the overall system performance.However,there are still many design challenges in high-performance Millimeter-wave frequency source technology based on silicon-based CMOS,which is a key and difficult point in Millimeter-wave circuit design.This thesis focuses on the core modules of the Millimeter-wave phase-locked loop:the Voltage-controlled oscillator and the divider,whose performance directly affects the overall performance of the system.First of all,this thesis provides an overview of the recent research status of voltage-controlled oscillators and dividers in both China and abroad.Next,the basic parameters and principles of voltage-controlled oscillators are then briefly introduced.Based on the phase noise conversion mechanism of the oscillator,this thesis discusses how to optimize the phase noise of the oscillator by employing harmonic tuning technology.This thesis designs the Voltage-controlled oscillator and divider of the 77GHz millimeter-wave radar frequency source,based on the standard 65nm CMOS process.Due to the use of a Voltage-controlled oscillator cascaded with a frequency quadrupler,this thesis designs a Class F₂₃ harmonic tuning Voltage-controlled oscillator with a frequency of 20GHz,which realizes the auxiliary resonance of the second and third harmonics to improve the phase noise performance of the oscillator.At a 1V power supply,the oscillator core consumes the current of 35m A.The oscillator chip achieves a high and low frequency band operation-mode conversion by switching varactors and capacitors.And the measured output frequency ranges of the high and low frequency bands under a tuning voltage of 0.3V-1.5V are 18.36GHz-19.04GHz and 18.75GHz-19.74GHz,respectively.The linearity of the K_VCO of the oscillator is compensated,with a K_VCOvariation of less than 18%,which has a good linearity.Through three bits of PVT-capacitance arrays,the total tuning range of 17.38GHz-19.74GHz is realized,with a relative tuning bandwidth of 12.7%.The phase noise of the output signal is measured to be-110.3 d Bc/Hz@1MHz at 18.59GHz.Finally,based on the current logic mode circuit structure,this thesis designs a millimeter-wave broadband programmable divider chain.The divider chain is composed of a prescaler and a multimode divider cascaded together,this thesis provides a detailed description of their design process and key design principles,and performs tape-out and test analysis of the frequency divider chain chip.The test results show that at an input power of 0d Bm,the frequency division range of the divider chain is greater than 78%（10GHz-23GHz）,achieving a variable division ratio of 256-507.The divider chain chip uses a 1V power supply voltage,and the core power consumption is 13m W.