Appendix 5
Wideband Impedance Matching: Dissipative Two-Port Networks
We will now detail the calculations relative to the wideband matching for two types of circuit characteristics of the transistors: the series-RC and the parallel-RC circuits.
A5.1. Series-RC circuit
Consider a series-RC-type circuit as shown in Figure A5.1.
Figure A5.1. RC-series-type load impedance
The reflection coefficient normalized from reference impedance R0 is written as:
A normalized frequency can be defined as:
The variation as a function of the normalized frequency 
is shown in Figure A5.2.
Figure A5.2. Module of the series-RC-type reflection coefficient
The low-frequency matching is obtained thanks to parallel resistance (Figure A5.3).
Figure A5.3. Series-RC resistive matching
The reflection coefficient is written as:
Matching is achieved with gl = l, that is
Figure A5.4 shows variation as a function of ...
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