# Input and Output Impedance of a SAW Filter

I am reading the datasheet of a SAW Filter B39162B4348P810. The datasheet doesn't say much about impedance of Input and Output port. However, on page 5, it considers Terminating source and load impedance for the specifications.

It says:

Temperature range for specification: T = –40 ˚C to +105 ˚C

Terminating source impedance: ZS = 50 Ω

Terminating load impedance: ZL = 50 Ω || 8.2 nH

Shall I consider to add an inductor of 8.2nH value in parallel at the output port?

• Given this is 1,600MHz, the equivalent Cout is about 1.2pF so as to resonate with 0.008 microHenry (8 nanoHenry). This will be very vulnerable to PCB capacitance. – analogsystemsrf Jan 1 '19 at 22:49
• Cout is the output impedance of the OUTPUT pin? I think you are saying that the capacitance of output pin will dependent on layout and hence, the output series inductance required to cancel it out will also vary? – abhiarora Jan 2 '19 at 13:00