高稳定度全集成433MHz振荡器的设计
发布时间：2018-11-29 12:41
【摘要】：振荡器是许多电子系统的重要组成部分,广泛应用于微电子系统电路中。电感电容振荡器的面积较大,增加了芯片的成本,且不易集成；环形振荡器的输出频率偏差较大,易受工艺、电源电压以及温度的影响。因此,设计一种能够实现全集成并且输出稳定的CMOS振荡器已经成为研究的热点。论文的主要工作是设计一款以环形振荡器为基础带有闭环自动频率控制电路的全集成振荡器,其频率稳定度取决于频率电压转化器以及参考电压。论文介绍了振荡器的基本工作原理、性能指标,详细分析了全集成振荡器的整体架构。本文设计了一种高精度的频率电压转换器,通过在充电电容和采样开关之间增加源极跟随器以及使用基于运放负反馈的电平移位电路,提高了输出频率稳定度。另一方面,考虑到噪声的影响,需要降低环形振荡器的灵敏度,本文设计了一种以开关电容阵列为负载的环形振荡器结构。论文中提出的高稳定度振荡器减少了电容的使用,达到了片上全集成的目的。本文基于SMIC0.18μmCMOS工艺,完成了电路及版图的设计,并进行了前后仿真验证。后仿真结果表明本文设计的全集成振荡器在电源电压变化范围为1.65-1.95V,温度变化范围为-20～100℃的情况下,其输出频率稳定度可达到433MHz±4MHz,相位噪声小于-98dBc/Hz@1MHz,1.8V的电源电压下消耗的电流小于1.6mA,满足设计指标要求。
[Abstract]:Oscillator is an important part of many electronic systems and is widely used in microelectronic system circuits. The inductance capacitor oscillator has a large area, which increases the cost of the chip and is difficult to integrate. The output frequency deviation of the ring oscillator is large, which is easy to be affected by the process, power supply voltage and temperature. Therefore, the design of a fully integrated and output stable CMOS oscillator has become a hot topic. The main work of this paper is to design a fully integrated oscillator with closed loop automatic frequency control circuit based on ring oscillator. Its frequency stability depends on the frequency voltage converter and the reference voltage. The basic working principle and performance index of the oscillator are introduced in this paper, and the whole architecture of the full integrated oscillator is analyzed in detail. In this paper, a high precision frequency and voltage converter is designed. By adding the source follower between the charging capacitor and the sampling switch and using the level shift circuit based on the negative feedback of the operational amplifier, the output frequency stability is improved. On the other hand, considering the effect of noise, the sensitivity of ring oscillator should be reduced. In this paper, a ring oscillator with switched capacitor array as the load is designed. The high stability oscillator proposed in this paper reduces the use of capacitors and achieves the purpose of full integration on a chip. Based on SMIC0.18 渭 mCMOS process, the circuit and layout are designed and verified by simulation. The simulation results show that the output frequency stability of the fully integrated oscillator can reach 433MHz 卤4 MHz when the voltage range is 1.65-1.95 V and the temperature range is -20 鈩，
本文编号：2365022
[Abstract]:Oscillator is an important part of many electronic systems and is widely used in microelectronic system circuits. The inductance capacitor oscillator has a large area, which increases the cost of the chip and is difficult to integrate. The output frequency deviation of the ring oscillator is large, which is easy to be affected by the process, power supply voltage and temperature. Therefore, the design of a fully integrated and output stable CMOS oscillator has become a hot topic. The main work of this paper is to design a fully integrated oscillator with closed loop automatic frequency control circuit based on ring oscillator. Its frequency stability depends on the frequency voltage converter and the reference voltage. The basic working principle and performance index of the oscillator are introduced in this paper, and the whole architecture of the full integrated oscillator is analyzed in detail. In this paper, a high precision frequency and voltage converter is designed. By adding the source follower between the charging capacitor and the sampling switch and using the level shift circuit based on the negative feedback of the operational amplifier, the output frequency stability is improved. On the other hand, considering the effect of noise, the sensitivity of ring oscillator should be reduced. In this paper, a ring oscillator with switched capacitor array as the load is designed. The high stability oscillator proposed in this paper reduces the use of capacitors and achieves the purpose of full integration on a chip. Based on SMIC0.18 渭 mCMOS process, the circuit and layout are designed and verified by simulation. The simulation results show that the output frequency stability of the fully integrated oscillator can reach 433MHz 卤4 MHz when the voltage range is 1.65-1.95 V and the temperature range is -20 鈩，
本文编号：2365022
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2365022.html
