AN3021
PIN Diodes for Microwave Switch Designs
Rev. V2
Schematic 3: SP2T All Shunt, 30 dB Isolation Design using π, C-L-C Lumped Element 90°
Transformer
B3
J1
B2
J3
J2
θ = 90 Deg
θ = 90 Deg
L
L
C
C
C
C
L = Zo / (2π * Fo)
C = 1 / (2π *Fo * Zo)
Fo = (Fmin* Fmax) 1/2
Schematic 3: D.C. Bias to RF Truth Table
RF State
B2 Bias
Low Loss J1-J2 & Isolation J1-J3
-V @ 0 mA
Low Loss J1-J3 & Isolation J1-J2
+1 V @ +20 mA
B3 Bias
+1 V @ +20 mA
-V @ 0 mA
7
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