Hello Experts!
I've tried to design a Colpitts oscillator but it's not meeting the Barkhausen criterion and so failed to oscillate. Please take a look into my netlist.
http://rapidshare.com/files/363782008/schematic_colpitts.jpg.html
http://rapidshare.com/files/363782013/Simulation_Colpitts.jpg.html
*******NETLIST using Orcad PSpice********
X_Q1 N06431 N00139 N02241 awb2n2222 PARAMS:
+
R_R1 N06431 N00127 50K TC=0,0
R_R3 0 N00139 100M TC=0,0
R_R4 N00139 N00127 100M TC=0,0
L_L1 N00293 0 0.15e-6
C_C2 N02241 N00293 0.01e-9 IC=7 TC=0,0
C_C1 N00293 N00139 0.1e-6 IC=7 TC=0,0
C_C3 0 N02241 100p IC=7 TC=0,0
V_V_supply N00127 0
+PWL 0 0 1n 5
R_R5 0 N02241 100 TC=0,0
***********************************
I've also specified an initial condition for all capacitors =7 and made these changes into simulation profile RELTOL=0.0001 and ABSTOL=0.001p;
Can you please help me out to identify the problem?
Thanks in advance,
Sudip
I've tried to design a Colpitts oscillator but it's not meeting the Barkhausen criterion and so failed to oscillate. Please take a look into my netlist.
http://rapidshare.com/files/363782008/schematic_colpitts.jpg.html
http://rapidshare.com/files/363782013/Simulation_Colpitts.jpg.html
*******NETLIST using Orcad PSpice********
X_Q1 N06431 N00139 N02241 awb2n2222 PARAMS:
+
R_R1 N06431 N00127 50K TC=0,0
R_R3 0 N00139 100M TC=0,0
R_R4 N00139 N00127 100M TC=0,0
L_L1 N00293 0 0.15e-6
C_C2 N02241 N00293 0.01e-9 IC=7 TC=0,0
C_C1 N00293 N00139 0.1e-6 IC=7 TC=0,0
C_C3 0 N02241 100p IC=7 TC=0,0
V_V_supply N00127 0
+PWL 0 0 1n 5
R_R5 0 N02241 100 TC=0,0
***********************************
I've also specified an initial condition for all capacitors =7 and made these changes into simulation profile RELTOL=0.0001 and ABSTOL=0.001p;
Can you please help me out to identify the problem?
Thanks in advance,
Sudip