ADRF5721

Data Sheet

Rev. 0 | Page 16 of 17

PROBE MATRIX BOARD

The probe matrix board is a 4-layer board. Similar to the evaluation

board, the probe matrix board also uses a 12 mil Rogers RO4003

dielectric. The top and bottom copper layers are 0.5 oz (0.7 mil)

plated to 1.5 oz (2.2 mil). The RF transmission lines are designed

using a CPWG model with a width of 16 mil and ground

spacing of 6 mil to have a characteristic impedance of 50 Ω.

Figure 31 and Figure 32 show the cross sectional view and the

top view of the board, respectively. Measurements are made

using GSG probes at close proximity to the RF pins (ATTIN

and ATTOUT). Unlike the evaluation board, probing reduces

reflections caused by mismatch arising from connectors, cables,

and board layout, resulting in a more accurate measurement of

the device performance.

Figure 31. Probe Matrix Board (Cross Sectional View)

Figure 32. Probe Matrix Board Layout (Top View)

The probe matrix board includes a thru reflect line (TRL)

calibration kit, allowing board loss de-embedding. The actual

board duplicates the same layout in matrix form to assemble

multiple devices at one time. Figure 33 is a detailed image of

the trace to pin transition with corresponding dimensions. All

S parameters were measured on this board.

Figure 33. Probe Board Layout Dimensions (Top View)

RO4003

1.5oz Cu (2.2mil)

1.5oz Cu (2.2mil)

0.5oz Cu (0.7mil)

0.5oz Cu (0.7mil)

1.5oz Cu (2.2mil)

1.5oz Cu (2.2mil)

W = 16mil

G = 6mil

T = 2.2mil

H = 12mil

8mil

16mil