Topic: Analog Electronics
A unilateral transistor has an output impedance Z_out = (10 - j10) Ω. Value of the series and shunt components of the matching network for complex conjugate match at the output of the device to 50 Ω load are:
- A. X_1 = -j25, X_2 = +j30
- B. X_1 = +j25, X_2 = +j30
- C. X_1 = -j25, X_2 = -j3
- D. X_1 = +j2, X_2 = -j30
Answer: A. X_1 = -j25, X_2 = +j30
Explanation: Z_out = (10 - j10) Ω, Z_L = 50 Ω. In order to match the network for complex conjugate at the output of device to 50 Ω: (Z_out + X_2) || X_1 = 50 Ω* = 50 Ω. This condition is fulfilled with only X_1 = -j25 and X_2 = j30 among various options.