3 1. In the circuit of FIGURE 1, the two-port network TPq\r can be represented by the z-parameters: Zll \Z21 ,„ 7 1? Z22 l XXXXXXXXXX) 5Q 5.c FIG. 1 (a) Represent the complete circuit by a z-parameter...

3
1. In the circuit of FIGURE 1, the two-port network TPq\r can be represented by the z-parameters:
Zll \Z21 ,„ 7 1? Z22 l (2 1 10)
5Q 5.c
FIG. 1
(a) Represent the complete circuit by a z-parameter matrix.
440 (b) State if the complete circuit is: (i) reciprocal (ii) symmetrical.
*so
2. Determine the value of Zo for the symmetrical fl-circuit shown in FIGURE 2.
60!20° 12
30° Q '303°
FIG. 2
3. A T-attenuator is required to be inserted between an amplifier and a transmission line. The power level to the line is required to be restricted to —3 dB. The gain of the amplifier is fixed at 24 dB and its maximum input signal is at a level of —1.0 dB.
Sketch a block diagram of the arrangement and calculate* suitable values of pad resistance if both the amplifier and the line have a characteristic impedance of 600 52.
*Whilst you are encouraged to check your answer using an `attenuator calculator', please show all working!