Analog Devices EVAL-ADRF5301, Руководство пользователя

Страница: 3 / 7

User Guide EVAL-ADRF5301
EVALUATION BOARD HARDWARE
analog.com Rev. 0 | 3 of 7
OVERVIEW
The ADRF5301-EVALZ is a connectorized evaluation board assem-
bled with the ADRF5301 device and application circuitry. All compo-
nents are located on the primary side of the ADRF5301-EVALZ.
Figure 5 shows the ADRF5301-EVALZ schematic, and Figure 6
shows the assembly drawing. Table 4 shows the bill of materials for
the ADRF5301-EVALZ components.
BOARD LAYOUT
The ADRF5301-EVALZ is designed using RF circuit design techni-
ques on a 4-layer printed circuit board (PCB). The PCB stack-up is
shown in Figure 2 .
Figure 2. Evaluation Board Stack-Up
The outer copper layers are 1.5 oz (2.2 mil) thick and the inner
layers are 0.5 oz (0.7 mil) thick.
All RF and DC traces are routed on the top copper layer, whereas
the inner and bottom layers are grounded planes that provide
a solid ground for the RF transmission lines. The top dielectric
material is 8 mil Rogers RO4003, offering optimal high-frequency
performance. The middle and bottom dielectric materials provide
mechanical strength. The total board thickness is 62 mil, which
allows 2.4 mm RF edge launch connectors to be placed at the
board edges.
The RF transmission lines are designed using a coplanar wave-
guide (CPWG) model with a width of 14 mil and ground spacing
of 7 mil to have a characteristic impedance of 50 Ω. Ground
via fences is arranged on both sides of a coplanar waveguide to
improve isolation between nearby RF lines and other signal lines.
RF INPUTS AND OUTPUTS
The RF input and output ports (RFC, RF1, and RF2) are connected
through 50 Ω transmission lines to the 2.4 mm RF connectors, as
shown in Table 1 . These high-frequency RF connectors are instal-
led onto the ADRF5301-EVALZ by contact and are not soldered
onto the board.
Table 1. RF Inputs and Outputs
2.4mm Connectors
Description
RFC RF Common Port
RF1 RF Throw Port 1
RF2 RF Throw Port 2
THRU1 Through Line Input and Output
THRU2 Through Line Input and Output
A through line (THRUCAL) is provided for calibration and connects
the unpopulated RF connectors. This transmission line is the trace
loss from the ADRF5301-EVALZ and is used to determine the
device performance at the pins of the IC.
Figure 3. Insertion Loss vs. Frequency