The Research And Design Of Low Power And Noise LC Oscillator Based On 65nm CMOS Process

The rapid development of the integrated circuit industry bring an unprecedented wealth of communications products to the market, while consumers are becoming more Critical about the wireless communication terminals, and the design of a faster, more secure, lower-power products are becoming more and more challenging Voltage controlled oscillators are the core of Bluetooth 4.2 wireless transceiver frequency sources. The design standards of VCOs are gradually becoming more stringent. Power and phase noise, the two most important parameters of the oscillator have always been concerned with the goal of the designers. Based on SMIC65nm CMOS process, two versions of the voltage voltage controlled oscillators used in Bluetooth 4.2 standards are analysised and well designed.After introducing the important components of oscillators and the startup condition,the paper emphatically analyzed the three calculation LC-VCO phase noise white noise model.Then the paper make a summary of the current two possible way that can cause MOS transistor flicker noise convert to output phase, and analyzes several designs that can reduce the oscillator phase noise. Firstly,this paper calculated how much the differential LC oscillator common-mode point of the second harmonic contribute to phase noise due to AM-PM conversions the way of calculating low-frequency noise output of the mixer. It verify that the existence of the parasitic capacitance of the transistor caused by the nonlinear oscillator can deteriorate phase noise,in the filter VCOs,by the post-simulation. Simulation results show that under IV supply voltage, voltage-controlled oscillator only consumes 0.6mW and;the phase noise is-124dBc/Hz@ 1MHz and-77dBc/Hz@ 10kHz,;FOM is 194; the oscillation frequency range is 2.32-2.65GHz and linear tuning range of is about 13%,Firstly the paper Analysises the relationship between the size of circuit parameters and the current reuse oscillator output amplitude and it solve the traditional problem of asymmetric output amplitude theoretically then it analyze the relationship between current efficiency and current oscillator conduction angle resulting the Class-C oscillator having a higher current efficiency. A low-power feedback amplitude class C LC-VCO is designed, solving the class-C start-up and optimum operating point bias problem, based on this theory. Finally, the Class-C current-reuse VCO simulation results can be obtained at 1.2V supply voltage, it consumes 1.1mW,with the phase noise of -126dBc/Hz@ 1MHz; FOM is 193, the oscillation frequency is 2.3～2.6GHz, tuning range of is about 12%. its Overall performance is a competitive selection...