The S-parameter model has been replaced with a nonlinear model (Spice model) and as a result the DC bias
circuit is needed to ensure the bipolar transistor is biased
to 10mA with a Vce of 8V. The 200-ohm resistor is designed to drop 4V to give a Vce of 8V. The emitter is
grounded via the DC_feed which is a block to all RF.
The base inductor is RF grounded via the 100pF capacitor and this is where the base voltage bias is applied.
The base resistors are set to give a 10mA collector current.
The ‘Oscport’ block will output the closed loop magnitude and phase of the circuit over the frequency range
specified within the Oscport block.
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