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Rev. 0.2 12/10 Copyright © 2010 by Silico n Laboratories AN414
AN414
EZRADIOPRO® LAYOUT DESIGN GUIDE
1. Introduction
The purpose of this application note is to help users design EZRadioPRO® PCBs using design practices that allow
for good RF performance. This application note also help designers by separating TX and RX concerns.
The RF performance and the critical maximum peak voltage on the output pin strongly depend on the PCB layout
as well as the design of the matching networks. For optimal performance, Silicon Labs recommends the use of the
PCB layout design hints described in the following sections.
2. Design Recommendations when Using EZRadioPRO RF ICs
Extensive testing has been completed using reference designs provided by Silicon Labs. It is recommended to
designers to use the reference designs “as-is” since they minimize detuning effects caused by parasitics,
component placement, and PCB routing.
When layouts cannot be followed as shown by the reference designs (due to PCB size and shape limitations),
the following layout design rules are recommended.
2.1. Guidelines for Layout Design when Using the Si4430/31
The Si4430/31 devices use a Class-E type TX matching network with a typical output power level of +13 dBm at
VDD = 3.3 V. Two basic types of board layout configurations exist at all frequency bands: the Split TX/RX type and
the Direct Tie type. In the Split TX/RX type, the TX and RX paths are separated, and individual SMA connectors are
provided for each path. In the Direct Tie type, the TX and RX paths are connected together directly, without any
additional RF switch. The operating principle of both types and the reference designs with element values are
given in “AN436: Si4030/4031/4430/4431 PA Matching” for wirewound and multilayer type 0402 size SMD
inductances as well.
The Split and Direct Tie type boards have slightly different PCB layouts, which are described in separate sections.
2.1.1. Split Type Matching Network Layout Based upon the 4431-T-B1_B Test Card
(Separate TX and RX Paths with Two Antennas)
Examples shown in this section of the guide are based upon the layout of the 4431-T-B1_B test cards. These cards
contain two separate antennas for the TX and RX paths. This type of test card is best suited for demonstrating the
output power and sensitivity of the EZRadioPRO RFICs. For this purpose, the TX and RX path layouts are
separated and isolated as much as possible to minimize the mutual coupling effects. This type of test card is
recommended for laboratory evaluation and not for range tests because the presence of two closely-spaced
antennas may cause “shadowing” when receiving a radiated signal.
The main layout design concepts are reviewed through this layout to demonstrate the basic principles. However,
for an actual application, the layouts of the test cards with a single antenna (or with antenna diversity) should be
used as references. The schematic of the Split type matching network for Si4431 RevB1 is shown in Figure 1.