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
Example of the RF devices			NJG1801K75 NJG1816K75 NJG1804K64 etc.	NJG1681MD7 NJG1682MD7 NJG1684ME2 etc.	NJG1815K75 NJG1818K75 etc.
DC bias status (SPDT switch cases)
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
	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.