多通道射频接收机测量噪声系数的新方法.PDF

!2008 14 277 多通道射频接收机测量噪声系数的新方法 1 1 2 吴鸣鸣 , 张钦宇, 路雪莲 ( 1. 5 18055; 2. 5 18055) : 噪声系数是多通道射频接收机的一个重要参数传统的噪声系数测量 法对大噪声系数测量存在不足, 且测 量时通道间会有噪声干扰提出一种多通道切换优化测量噪声系数的 法: 通过设计 1 个八选 一的射频开关实现信道切 换, 并引入前置低噪声放大器的控制电路提供冷热噪声源, 优化Y 因子测量噪声系数的 法, 实现对各通道的精确测量由 于接收机前端的相似性, 该 法可推广应用到其他的射频接收机 : 噪声系数; 射频开关; 射频接收机; Y 因子法 : T N851 : B : 1004 373X( 2008) 14 139 03 New Method of Noise Figure Measurement for Multi channel RF Receiver 1 1 2 W U Mingming , Z HA NG Qin u , LU Xuelian ( 1. Communication Engineering Research Center of Shenzhen G raduate School, Harbin Institute of T echnolog , Shenzhen, 5 18055, China; 2. Siemens Mindit M agnetic Resonance Lt d. , Shenzhen, 518055, China) Abstract: Noise figure is crucial for multi channel RF receiver . The measurements used before have some disadvantages when measure w ith big NF , and t here is noise interfere among channels as w ell. Here a new met hod of noise figure measure ment w ith multi- channel sw itch is proposed, in which w e design a SP MT RF sw itch and optimize the Y - factor method b adding the control circuit for LNA t o provide noise source in different temperature. T his method is effective and due to the comparabilit of receiver front ends, it can also be used in other RF receiver . Keyw ords: noise figure; RF switch; RF receiver; Y factor met hod , 1 , , PN , , , , , ,