●●● Microwave and RF ●●●● ●●● ●●0 ●●● ●●● Design of Wireless ●●00 ● Systems Chapter 8 Transistor Oscillators And Frequency Synthesizers Dr.Xian Qi Lin 7
Microwave and RF Design of Wireless Systems Transistor Oscillators And Frequency Synthesizers Chapter 8 Dr. Xian Qi Lin 7
●●● ●●●● ●●●心 ●●●● Functions:Proving precisely controlled sources for ●●●●0 ●●●● frequency conversion and carrier generation. ●●●● ●● Simple transistor oscillator:lack the frequency stability and low-noise performance.简单的晶体管振荡器频率稳定度 和低噪声性能差。 Require: Frequency stability:0.5~2 PPM PPM:10-6△f/f;(PPb:10-9:PPt:10-12) Phase noise:-80~-110dBc/Hz @10kHz Crystal controlled oscillators with high frequency stability and low phase noise are often used to provide accurate frequency reference.晶体控制的振荡器具有高的频率稳 定度和低的相位噪声，因而常常用来提供精确的频率参考 8
Functions: Proving precisely controlled sources for frequency conversion and carrier generation. Simple transistor oscillator: lack the frequency stability and low-noise performance.简单的晶体管振荡器频率稳定度 和低噪声性能差。 Frequency stability: 0.5~2 PPM PPM: 10-6Δf/f; (PPb: 10-9; PPt: 10-12) Phase noise:-80~-110dBc/Hz @10kHz Require: Crystal controlled oscillators with high frequency stability and low phase noise are often used to provide accurate frequency reference.晶体控制的振荡器具有高的频率稳 定度和低的相位噪声，因而常常用来提供精确的频率参考 8
●●● ●●●● ●●●●● ●●●0 ●●●●0 ●●●● ●●●● ●● §8.1 RF Oscillators射频振荡器 §8.2 Microwave Oscillators微波振荡器 8.3 Frequency Synthesis Methods 频率合成方法 8.5 Oscillator Phase Noise 振荡器相位噪声 9
§8.1 RF Oscillators射频振荡器 §8.2 Microwave Oscillators微波振荡器 §8.3 Frequency Synthesis Methods 频率合成方法 §8.5 Oscillator Phase Noise 振荡器相位噪声 9
●●● ●●●● ●●●●● §8.1 RF Oscillators ●●●● ●●●●0 ●●●● ●●●● Oscillator is a nonlinear circuit that converts DC ●● power to an AC waveform providing sinusoidal output in wireless systems.振荡器是一个非线性电路，它把 直流的功率变成交流，并且在无线系统中提供正弦输出 Vi(@) Vo(w) Vo(@)=AV;(@)+H(@)AV(@) A 、',(o) H(@) Vo(@)=]-AH(@) If 1-AH(@)=0,when Vi(@)=0,Vo (@)t0,oscillate. The frequency of oscillator depends on the network H(@). 振荡器的频率依赖于网络的传输函数 10
§8.1 RF Oscillators Oscillator is a nonlinear circuit that converts DC power to an AC waveform providing sinusoidal output in wireless systems.振荡器是一个非线性电路，它把 直流的功率变成交流，并且在无线系统中提供正弦输出 If 1-AH () =0, when Vi () =0, V0 () ≠0, oscillate. The frequency of oscillator depends on the network H (). 振荡器的频率依赖于网络的传输函数 ( ) 1 ( ) ( ) 0 Vi AHA V 0 o () () () () V AV H AV i 10
●●● ●●●● 1.General Analysis ●●●●● ●●●0 ●●●●0 ●●●0 Device of oscillator:BJT,FET ●●●● Circuit: Common emitter,common base,common collector. ● Common source,common gate,common drain. 基极/摄极 集电极/漏极 SY G 8m(Y-V2) 0◆V2 发射极/源极 发射极/源极 ·Common emitter:V2=0 反馈网络 双极结型晶体普 或场效应晶体管 「(Y1+Y3+G) -(Y十G) -Y3 0 7 -(Y1 +Gi+gm)(Y1+Y2+Gi+Go+8m) -Y2 -Go =0 -Y3 -Y2 (Y2+Y) 0 8m -(G。+gm） 0 Go 11
Common emitter: V2=0 1. General Analysis Circuit: Common emitter, common base, common collector. Common source, common gate, common drain. Device of oscillator: BJT, FET 11