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Design of Microwave Active Devices by Jean-Luc Gautier

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Appendix 6

Wideband Amplification: Parallel Resistive Feedback

Let us consider a two-port network with parallel feedback that consists of normalized impedance images its normalized admittance matrix is expressed in its simple form as images

So the scattering matrix of the two-port network with feedback is:

images

If we use the simplified model of the transistor as defined in section 1.5.3.2, the following results are obtained:

images

images

– Resistive feedback

In this case, y = g resistive.

The equations are expressed as:

images

Low-frequency matching is obtained when canceling S11 and S22 when p → 0.

images

Simultaneous matching is only possible if Z0gd images1.

Under these conditions:

As we report this condition in the equations, the low-frequency ...

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