低噪声放大器设计VIP专享VIP免费

低噪声放大器设计线性仿真内容说明设计一个低噪声放大器（LNA）元件特性测试稳态电路调节输入、输出匹配电路调节LNA总电路特性测试技术指标工作频率：5GHz增益：＞10dB噪声系数：＜1.2dB稳定性：无特别要求器件测试创建原理图，命名为Device在元件库选择器件，富士FHX35LG，则自动导入S参数及噪声数据依次添加电路图、图表、测量参数添加端口参数S11、S22，增益参数S21、MSG添加稳态参数K、B1，噪声参数NF、NFmin添加元件12SUBCKTNET=ID="FHX35LG"S1说明:添加元件后，数据文件自动导入，可在工程浏览页查看。编辑元件符号123SUBCKTNET=ID="FHX35LG"S1说明:双击打开元件属性对话窗。改变接地点类型：重设符号，选择FET类型：说明:此时仅显示3节点的元件符号。添加端口123SUBCKTNET=ID=FHX35LGS1PORTZ=P=50Ohm1PORTZ=P=50Ohm2设置频率0.1GHz～20GHz，步长0.1GHz：说明:必须要点击Apply才能设定好频率。查看元件数据在晶体管符号上点右键，选opensubcircuit，可查看线性s参数、噪声数据等说明:参数都是可以编辑的，注意！测量端口参数S11、S22创建图表：Inputport，Outputport01.01.0-1.010.010.0-10.05.05.0-5.02.02.0-2.03.03.0-3.04.04.0-4.00.20.2-0.20.40.4-0.40.60.6-0.60.80.8-0.8OutportPortSwpMax20GHzSwpMin0.1GHzS[2,2]Device01.01.0-1.010.010.0-10.05.05.0-5.02.02.0-2.03.03.0-3.04.04.0-4.00.20.2-0.20.40.4-0.40.60.6-0.60.80.8-0.8InputPortSwpMax20GHzSwpMin0.1GHzS[1,1]Device测量增益参数创建图表：TwoPortGain，测S21、MSG重设频率坐标：取消Auto，设起始值为005101520Frequency(GHz)TwoPortGain010203040DB(|S[2,1]|)DeviceDB(MSG)Device测量噪声参数创建图表：TwoPortNoiseParameters，测NF、NFmin，测量类型为noise重设频率坐标：设起始值为005101520Frequency(GHz)TwoPortNoiseParameters00.511.522.53DB(NF)DeviceDB(NFMin)Device测量噪声参数创建图表：TwoPortNoiseParameters，测K、B1，测量类型为linear在K参数曲线上标注出K＝1的频点05101520Frequency(GHz)StabilityData00.511.511.763GHz1B1DeviceKDevice说明:不要选dBs单位。创建稳态电路创建原理图：StableDevice，调节RESR=ID=450OhmR1RESR=ID=300OhmR2RESR=ID=20OhmR3TLINF0=EL=Z0=ID=5GHz90Deg75.4OhmTL1123SUBCKTNET=ID="FHX35LG"S1PORTZ=P=50Ohm1PORTZ=P=50Ohm2说明:R1、R2、R3为可调电阻。调节结果01.01.0-1.010.010.0-10.05.05.0-5.02.02.0-2.03.03.0-3.04.04.0-4.00.20.2-0.20.40.4-0.40.60.6-0.60.80.8-0.8InputPortSwpMax20GHzSwpMin0.1GHzS[1,1]StableDevice工作点，5GHz05101520Frequency(GHz)TwoPortNoiseParameters012345678910DB(NF)StableDeviceDB(NFMin)StableDevice05101520Frequency(GHz)StabilityData-10123456789B1StableDeviceKStableDevice圆图测量测量噪声系数圆NFCIR，稳定性圆SCIR1,测量类型为circle。InputPortSwpMax20GHzSwpMin0.2GHzNFCIR[1,0.45]StableDeviceSCIR1StableDevice说明:可重设频点的范围、步长，以减少显示的曲线数。潜在不稳定区输入匹配添加输入匹配电路：Inputmatchingcircuit，频率设为5GHzRESR=ID=450OhmR1RESR=ID=300OhmR2RESR=ID=20OhmR3TLINF0=EL=Z0=ID=5GHz90Deg75.4OhmTL1123SUBCKTNET=ID="FHX35LG"S1PORTZ=P=50Ohm1PORTZ=P=50Ohm212SUBCKTNET=ID=StableDeviceS112SUBCKTNET=ID=InputMatchingCircuitS2PORTZ=P=50Ohm1PORTZ=P=50Ohm2INDL=ID=2.5nHL1INDL=ID=4.37nHL2CAPC=ID=100pFC1PORTZ=P=50Ohm1PORTZ=P=50Ohm2L1、L2为可调受限变量，设置如下：说明:元件属性设置与变量调节器是相互对应的。01.01.0-1.010.010.0-10.05.05.0-5.02.02.0-2.03.03.0-3.04.04.0-4.00.20.2-0.20.40.4-0.40.60.6-0.60.80.8-0.8InputPortOfDeviceSwpMax5GHzSwpMin5GHzNFCIR[2,0.5]StableDeviceGAC_MAX[1,2]StableDeviceS[2,2]InputMatchingCircuit调节L1、L2，在噪声、增益、匹配之间找个平衡点噪声圆增益圆INDL=ID=2.18nHL1CAPC=ID=100pFC1PORTZ=P=50Ohm1PORTZ=P=50Ohm2添加输出匹配电路：Outputmatchingcircuit，调节使得增益值最大。输出匹配LNA总电路12SUBCKTNET=ID=StableDeviceS112SUBCKTNET=ID=InputMatchingCircuitS212SUBCKTNET=ID=OutputMatchingCircuitS3PORTZ=P=50Ohm1PORTZ=P=50Ohm2INDL=ID=2.18nHL1CAPC=ID=100pFC1PORTZ=P=50Ohm1PORTZ=P=50Ohm2RESR=ID=450OhmR1RESR=ID=300OhmR2RESR=ID=20OhmR3TLINF0=EL=Z0=ID=5GHz90Deg75.4OhmTL1123SUBCKTNET=ID="FHX35LG"S1PORTZ=P=50Ohm1PORTZ=P=50Ohm2INDL=ID=2.33nHL1INDL=ID=2.73nHL2CAPC=ID=100pFC1PORTZ=P=50Ohm1PORTZ=P=50Ohm205101520Frequency(GHz)GainAndMatch-40-30-20-1001020DB(|S[2,1]|)AmplifierDB(|S[1,1]|)AmplifierDB(|S[2,2]|)Amplifier05101520Frequency(GHz)Noise012345678910DB(NF)Amplifier最终结果将频率再设回最初的宽频带：0.1～20GHz增益，匹配，噪声结果：Done!