GA-Spice Example:  RF Matching Network
RF match schematic

Circuit Topology Description

  • C1 and C2 are tuning capacitors
  • Lbond models bond wire capacitance
  • Cpad models parallel combination of pad and metal trace capacitance
  • Lin is an IC inductor
  • RS1, CS1, RS2, CS2, and Rin model parasitics of IC inductor
  • Cpar2 models metal trace capacitance
  • R3 and C3 are the input impedance of a biasing circuit
  • Rin and Cin model the input impedance of a MOSFET.

Problem Description

  • Determine the values of C1 and C2 to achieve an input impedance of 50 + j 0 ohms at 2.45 GHz.
  • C1& C2 encoded as problem variables using 10 bits each.
  • Solve time approximately 15 minutes on a 200 MHz Pentium II notebook computer.

Results

  • Zin = 50.75 - j 3.5 Ohms at 2.45 GHz
  • C1 = 306 pf
  • C2 = 20 pf

If you would like more details on this problem or further information on the GA-Spice program please send an e-mail to Dr. Ross.

Home Last updated May 8, 2001.