Hi
I am playing with a simple LC oscillator (Credits: @Danko )
Here is the spice netlist.
The simulation (LTSpice) does not give the correct output if uic is not used. It just shows a steady dc voltage as output without uic.
I understand that the uic parameter tells spice to use the initial conditions on components like caps and inductors.
But isn't an LC oscillator like "self starting". Does it not start up without any noise/disturbance ?
I am playing with a simple LC oscillator (Credits: @Danko )
Here is the spice netlist.
Code:
* LC oscillator
.model bjt_npn npn
V1 nPower gnd dc 12
C_sink nQ1Base gnd 1u
R_bias nPower nQ1Base 50k
C_tank1 nPower nVout 1u
L_tank nPower nVout 27m
C_tank2 nVout 5 0.05u
C_tank3 5 gnd 0.1u
Q1 nVout nQ1Base 4 bjt_npn
R_feedback 5 4 510
R_E 4 gnd 100
* Note: circuit does not oscillate without uic
.tran 1u 1 uic
.plot nVout
.end
I understand that the uic parameter tells spice to use the initial conditions on components like caps and inductors.
But isn't an LC oscillator like "self starting". Does it not start up without any noise/disturbance ?
Last edited: