# solution10 - Solutions for Problems of Chapter 10(1 A SPST...

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0 Z d Z 0 Z s V L V L I Figure 1. Series configuration Solutions for Problems of Chapter 10 (1) A SPST switch is designed using PIN diodes with following characteristics: pF C j 1 . 0 = = 1 f R = 4 r R nH L 3 . 0 int = The center frequency of the design is 3GHz, calculate and plot the switch performance over the frequency range of 2 to 4GHz (a) Series configuration (b) Shunt configuration Solution: Forward: int L j R Z f f ω + = Reverse: ] 1 [ int j r r C L j R Z + = (a) Series configuration: 0 0 10 2 2 log 20 Z Z Z IL f + = Isolation= 0 0 10 2 2 log 20 Z Z Z r + (b) Shunt configuration: r r Z Z Z IL 2 2 log 20 0 10 + = Isolation= f f Z Z Z 2 2 log 20 0 10 + 2E+009 2.5E+009 3E+009 3.5E+009 4E+009 Frequency (Hz) 0.09 0.095 0.1 0.105 0.11 0.115 0.12 I n s e r t i o L ( d B ) 12 13 14 15 16 17 18 19 l a 2E+009 2.5E+009 3E+009 3.5E+009 4E+009 Frequency (Hz) 0.005 0.01 0.015 0.02 0.025 11 12 13 14 15 16 17 0 Z d Z 0 Z s V L V L I I Figure 2. Shunt Configuration Figure 3. Performance of series configuration Figure 4. Performance of shunt configuration

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+ = 100 100 j Z 50 50 50 50 S j Y 02 . 0 02 . 0 + = (a) (b) Figure 5 (2) Derive the phase shift and attenuation for the circuits shown in Figure 5 (a) (b) Solution:
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solution10 - Solutions for Problems of Chapter 10(1 A SPST...

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