Are there any cases where DC blocking capacitors are required for RF switches not needing DC blocking capacitors connected to the RF terminals?
- * This FAQ mainly explains GaAs products using GaAs substrates and RF CMOS products using SOI technology.
RF DeviceHow to use
For products described as "unless DC is biased externally" with the above description in the datasheet, the RF switches may not operate normally when DC voltage is applied externally to the RF terminals.
In the case, please connect DC blocking capacitors to the RF terminals. The capacitance value should be selected according to the frequency of the RF signal to be used.
Reasons DC Blocking Capacitors Are Needed
Connected component example |
General switch |
Switch with negative voltage generating circuit |
Switch with Integrated capacitor |
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Example of the RF devices |
etc. |
etc. |
etc. |
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DC bias status |
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Requirement of DC blocking capacitors depending on connected components. |
a) Connected to DC ground |
Required |
Not required |
Not required |
|
b) Connected to DC biased component |
Required | Required | Not required |
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c) connected to SAW filter* |
Not required |
Not required |
Not required |
- * SAW filter blocks DC bias in nature. However, please note the maximum ratings of the SAW filters to be used.
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