随着近几年无线通讯系统的蓬勃发展,推动了无线收发机的研究与开发。振荡器是无线收发机的关键模块,作为收发机中的本地振荡源进行频率转换和信道选择。相位噪声是振荡器的重要性能指标,对振荡器有着至关重要的影响。近些年,大多研究的是1/f区域的相位噪声,而对1/f2区域的相位噪声则很少涉及。在Hajimiri和Lee提出的线性时变模型的基础上,推导由基极电阻热噪声引起的相位噪声表达式,并通过仿真验证该方法的可行性。 With the vigorous development of wireless communication systems in recent years, the research and development of wireless transceivers have been promoted. An oscillator is a key module of a wireless transceiver that performs frequency conversion and channel selection as a local oscillator source in a transceiver. Phase noise is an important oscillator performance indicator, the oscillator has a crucial impact. In recent years, most studies have focused on phase noise in 1 / f regions, whereas phase noise on 1 / f2 regions has rarely been addressed. Based on the linear time-varying model proposed by Hajimiri and Lee, the expression of phase noise caused by thermal resistance of base resistance is deduced. The feasibility of this method is verified by simulation.