Conjugate Match of a Transistor
The scattering and noise parameters of a BJT at 4GHz are:
S11=0.641 ∠−171.3° S12=0.057 ∠16.3° S21=2.058 ∠28.5° S22=0.572 ∠−95.7°
Ref. Gonzalez, Microwave Transistor Amplifiers: Analysis and Design 2nd ed., Prentice Hall, example 3.6.1, p.243
Transistor Characteristics
this.push_element("ref=P1;val=1 Z0=50;x=112;y=128;rot=0;sx=1;sy=1;symbol=powersource") this.push_element("ref=P2;val=1 Z0=50;x=352;y=128;rot=0;sx=1;sy=1;symbol=powersource") this.push_element("ref=S1;val=FET;x=232;y=136;rot=0;sx=1;sy=1;symbol=s2p_nmos") this.push_element("ref=*1;val=*;x=112;y=160;rot=0;sx=1;sy=1;symbol=gnd") this.push_element("ref=.1;val=.SP LIN 1 6G 6G;x=112;y=200;rot=0;sx=1;sy=1;symbol=spice") this.push_element("ref=*2;val=*;x=352;y=160;rot=0;sx=1;sy=1;symbol=gnd") this.push_element("ref=.2;val=.MODEL FET S2P ID=MODEL_S2P;x=112;y=216;rot=0;sx=1;sy=1;symbol=spice") this.push_element("ref=*3;val=*;x=248;y=176;rot=0;sx=1;sy=1;symbol=gnd") this.push_wire("ref=1;solder_start=false;solder_stop=false",[112,104,192,104,192,136,216,136]) this.push_wire("ref=2;solder_start=false;solder_stop=false",[248,104,352,104]) this.push_wire("ref=0;solder_start=false;solder_stop=false",[112,152,112,152]) this.push_wire("ref=0;solder_start=false;solder_stop=false",[352,152,352,152]) this.push_wire("ref=0;solder_start=false;solder_stop=false",[248,168,248,168])
s2p Model
Simulation Results
Matching Network
this.push_element("ref=P1;val=1 Z0=50;x=64;y=112;rot=0;sx=1;sy=1;symbol=powersource") this.push_element("ref=P2;val=1 Z0=50;x=480;y=112;rot=0;sx=1;sy=1;symbol=powersource") this.push_element("ref=S1;val=FET;x=272;y=120;rot=0;sx=1;sy=1;symbol=s2p_nmos") this.push_element("ref=*1;val=*;x=64;y=144;rot=0;sx=1;sy=1;symbol=gnd") this.push_element("ref=.1;val=.SP LIN 21 5G 7G;x=112;y=200;rot=0;sx=1;sy=1;symbol=spice") this.push_element("ref=*2;val=*;x=480;y=144;rot=0;sx=1;sy=1;symbol=gnd") this.push_element("ref=.2;val=.MODEL FET S2P ID=MODEL_S2P;x=112;y=216;rot=0;sx=1;sy=1;symbol=spice") this.push_element("ref=*3;val=*;x=288;y=160;rot=0;sx=1;sy=1;symbol=gnd") this.push_element("ref=T1;val=MS1 Z0=50 L=6.7m;x=160;y=112;rot=90;sx=1;sy=1;symbol=microstrip") this.push_element("ref=.3;val=.MODEL MS1 TL Vf=0.7236;x=112;y=232;rot=0;sx=1;sy=1;symbol=spice") this.push_element("ref=T2;val=MS1 Z0=50 L=2.23m;x=200;y=88;rot=0;sx=1;sy=1;symbol=microstrip") this.push_element("ref=T3;val=MS1 Z0=50 L=6.12m;x=344;y=88;rot=0;sx=1;sy=1;symbol=microstrip") this.push_element("ref=T4;val=MS1 Z0=50 L=6.37m;x=432;y=112;rot=90;sx=1;sy=1;symbol=microstrip") this.push_wire("ref=1;solder_start=false;solder_stop=false",[224,88,240,88,240,120,256,120]) this.push_wire("ref=2;solder_start=false;solder_stop=false",[288,88,320,88]) this.push_wire("ref=0;solder_start=false;solder_stop=false",[64,136,64,136]) this.push_wire("ref=0;solder_start=false;solder_stop=false",[480,136,480,136]) this.push_wire("ref=0;solder_start=false;solder_stop=false",[288,152,288,152]) this.push_wire("ref=3;solder_start=false;solder_stop=false",[64,88,176,88]) this.push_wire("ref=4;solder_start=false;solder_stop=false",[368,88,480,88]) this.push_wire("ref=3;solder_start=true;solder_stop=false",[160,88,160,88]) this.push_wire("ref=5;solder_start=false;solder_stop=false",[160,136,160,136]) this.push_wire("ref=4;solder_start=true;solder_stop=false",[432,88,432,88]) this.push_wire("ref=6;solder_start=false;solder_stop=false",[432,136,432,136])