Phase Shifter Design TutorialSheet 1 of 12
Phase Shifter Design Tutorial Introduction Phase shifters are devices used to adjust transmission phase in a system, they can be fixed phase digital phase shifters or analogue variable types. Switched-Line Phase shifter These phase shifters are similar to their attenuator equivalent where two SPDT switches are used to switch two line lengths, one of which is X degrees longer in electrical length than the other. The circuit is shown in Figure 1.
Vcontrol
Line length 2
Line length 1
Figure 1 Switched-line phase shifter. Line length 2 has a longer electrical length than line length 1 so when switched in line will cause an in-line phase shift φ=β(l2-l1).
Required phase shift φ = β(l 2 l 1 ) Where β =
ω
Vp
and Vp =
1
ε eff
Example Design a switched-line phase shifter wit……
