ADG901/ADG902

Rev. B | Page 11 of 16

ADG90x EVALUATION BOARD

The ADG90x evaluation board allows designers to evaluate the

high performance wideband switches with a minimum of effort.

To prove that these devices meet user requirements, the user

requires only a power supply and a network analyzer along with

the evaluation board. An application note is available with the

evaluation board and provides complete information on

operating the evaluation board.

The RF1 port (see Figure 23) is connected through a

50 Ω transmission line to the top left SMA Connector J1. RF2 is

connected through a 50 Ω transmission line to the top SMA

Connector J2. J3 is connected to GND. A through transmission

line connects J4 and J5 and this transmission line is used to

estimate the loss of the PCB over the environmental conditions

being evaluated.

The board is constructed of a 4-layer, FR4 material with

a dielectric constant of 4.3 and an overall thickness of

0.062 inches. Two ground layers with grounded planes

provide ground for the RF transmission lines. The trans-

mission lines were designed using a coplanar waveguide

with ground plane model using a trace width of 0.052 inches,

clearance to ground plane of 0.030 inches, dielectric thickness

of 0.029 inches, and a metal thickness of 0.014 inches.

Figure 23. ADG90x Evaluation Board Top View