RF Electronics Chapter 2: Computer Simulation Page 36
2022, C. J. Kikkert, James Cook University, ISBN 978-0-6486803-9-0.
component value variables evaluated from the equations in the Global Definitions
window.
Figure 2.43. Bandpass T equations in Global Definitions window.
Figure 2.44 uses a voltage controlled voltage source to implement the impedance of the
source and is only included to show the complex source impedance of transistor can be
realised. The Voltage Controlled Voltage Source, resistor R1 and inductor L1, provide
the same impedance as the transistor. Figure 2.45 implements that complex impedance as
part of port 1. The component values are calculated to be Lbt = 17.61 nH, Cbt1 = 46.92
pF and Cbt2 = 37.22 pF. In addition, the components were assigned typical Q values of
100 for the inductor and 300 for the capacitors. Figure 2.46 shows the resulting frequency
response of the network of figure 2.45. The impedance match is very good at 150 MHz
and is better if ideal elements are used.
Figure 2.44. Calculated Bandpass T matching network with VCVS impedance matching.
Figure 2.45. Calculated Bandpass T matching network with Port source impedance matching.
RF Electronics: Design and Simulation
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