AN3021
PIN Diodes for Microwave Switch Designs
Rev. V2
Schematic 5: SP2T Series-Shunt, 40 dB Isolation Design with +5 V Supply
+5V
+5V
J1
+5V
+5V
+5V
330 Ω
B3 Series
Bias
330 Ω
B2 Series
Bias
330 Ω
SN7406
Open Collector
+ 5V TTL Driver
SN7406
Open Collector
+ 5V TTL Driver
B0
J3
Voltage
J2
B3 Shunt
B2 Shunt
Bias
Bias
+5V
+5V
330 Ω
+5V
+5V
330 Ω
SN7406
Open Collector
+ 5V TTL Driver
SN7406
Open Collector
+ 5V TTL Driver
Schematic 5: D.C. Bias to RF Truth Table
RF State
B2 Series Bias B2 Shunt Bias B3 Series Bias
J1-J2 Low Loss &
J1-J3 Isolation
J1-J3 Low Loss &
J1-J2 Isolation
+0.5 V @ 11 mA
+1.4 V @ +11 mA
(To J2 Shunt Diode)
+5 V @ 0 mA
+0.5 V @ +11 mA
+1.4 V @ +11 mA
(To J3 Shunt Diode)
+0.5 V @ +10 mA
Notes:
1. Forward Bias Diode ∆Vf @ 10 mA ~ +0.9 V
2. Reverse Bias Series Diode = (+1.4 V - +1.4 V) = 0 V
3. Reverse Bias Shunt Diode = (+0.5 V - +5.0 V) = -4.5 V
B3 Shunt Bias
+0.5 V @ +11 mA
+5 V @ 0 mA
B0 Voltage
+1.4 V
+1.4 V
9
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