Design Of Wide Tuned Digitally Controlled Oscillator And Injection-locked Frequency Divider In Millimeter-Wave Band

With the rapid development of the technologies such as satellite communication and automotive radar,millimeter-wave communication technology has broad application prospects in various fields of military and civilian use.The millimeter-wave frequency synthesizer is a key module in the millimeter-wave communication system,and its performance directly determines the quality of the communication.In the frequency synthesizer based on all-digital phase-locked loop,the digitally controlled oscillator and its frequency divider are the core modules,and they are the premise and key for the frequency synthesizer to provide high-quality local oscillator signal for the whole communication system.In this paper,the millimeter-wave digitally controlled oscillator with wide tuning range and the frequency divider with wide locking range are studied.The electromagnetic simulation of passive components such as inductors and capacitors is researched and the phase noise and the structure of millimeter-wave digitally controlled oscillators with wide tuning range are mainly studied.Besides,the frequency locking range and input sensitivity of the millimeter-wave frequency divider are discussed.The main work of this paper can be summarized as follows:1.Based on electromagnetic theory,the electromagnetic simulation and modeling of passive components such as inductors and capacitors are deeply studied.With the electromagnetic simulation software,the inductor model with high precision which is suitable for millimeter-wave band is discussed and based on DiCAD(digital controlled artificial dielectric)technology,a variable capacitor model with a wide tuning range is proposed.2.Based on 40 nm CMOS technology,a digitally controlled oscillator applied to the millimeter-wave all-digital phase-locked loop is designed.The variable capacitors based on DiCAD technology is established for the tuning capacitance of digitally control oscillator.The post-simulation results show that the frequency range of the digitally controlled oscillator is 79.28 GHz-89.6 GHz and the tuning range is higher than 12.2% at a power supply voltage of 0.9V.The frequency tuning resolution of 2.6 MHz is achieved by using transformer technology.The best phase noise is-95.6dBc/Hz at 1MHz offset.The circuit area is approximately 0.33mm×0.66 mm.In addition,the test of the digitally control oscillator sample chip is completed.The test results show that the frequency range is 76.61 GHz-84.51 GHz,and the phase noise of the 1 MHz frequency offset at the highest frequency is-86.47 dBc/Hz.3.Based on the 40 nm CMOS technology,an injection-locked frequency divider for millimeter-wave frequency synthesizers is designed.The LC tank has been optimized to raise the frequency performance.Without the injected signal,the frequency of the LC resonant network is 39.5GHz.By studying the mathematical model of the locking range of the injection-locked frequency divider,the size and quality factor of the inductors are optimized based on the electromagnetic simulation software to expand the locking range.The pre-simulation,layout design and post-simulation of the circuit are completed.According to the post-simulation,the input sensitivity and lcoking range are given.When the power of the injected signal is 0 dBm,the frequency divider has a locking range of 72GHz-91 GHz.The core chip area is about 0.12mm×0.14mm?...