User's Manual

TiWi-C-W Module

USER GUIDE

The information in this document is subject to change without notice.

5.4 Module Integration Considerations - Circuit Implementation

It is recommended that all connection PCB (printed circuit board) traces to the power supply and

digital control terminal be as short as possible. Though not necessarily required in all cases, it

is a best practice to provide an optional shunt capacitor placement at the module pin on all

active and routed power supply and digital control lines. Further, a series damping resistor

placement should be incorporated between the module pin/shunt capacitor node and the

source/sink of the digital control signals. This provides for effective bypassing and decoupling

of digital lines from the radio module, in the event that the application circuit has longer power

supply and digital routing.

5.5 Module Integration Considerations - Top Assembly

In addition to the recommendations given for the antenna systems and the module placement

onto a product PCB, it is recommended that all wiring and interconnect systems within the

product be not routed anywhere close the module and its associated circuitry on the PCB, doing

so could change the emission characteristics of the module.

5.6 Testing Requirements for End-Product

Once the module is integrated and the product realized in a mobile or portable configuration, the

product must be tested and follow the verification process for Unintentional Conducted and

Radiated Emissions in accordance to the FCC and IC guidelines. The module needs to be

powered and placed in the receive mode for this test. The receiver must be tuned to its lowest

frequency channel, mid-frequency channel, and highest frequency channel. The supporting test

data does not need to be submitted to the FCC or IC.

5.7 Design and Production Validation

Applications of the WLAN transceiver are supported by a specific set of antenna sub-systems:

chip antennas driven through PCB traces and matching networks, and external cabled antennas

driven through U.FL connectors. The antenna subsystem designs are validated in initial

engineering tests prior to production release. Throughout the production life of the module, both

AQL (Acceptable Quality Level) and sample tests are performed to check process stability of the

modules’ conducted performance. The antenna subsystems are periodically sampled on an

AQL basis and checked for performance stability over the production process. Both the initial

engineering design validation and the production sampling use the same procedure, techniques,

and equipment.

The antenna subsystems are tested at a 50 Ohm test point reference plane for the driving point

reflection parameters (1-port S-parameters) to characterize the return and mismatch losses.

The module is placed in a special engineering/production only CW mode and the output power

is measured at various frequencies of interest (low, middle, high channels) to normalize

consequent antenna Effective Radiated Power (ERP) pattern measurements to obtain antenna

power gain in dBi (decibels above isotropic). The power gain patterns are analyzed for peak

and average gain, and are monitored for statistical stability or stationarity.

This process is again performed for both initial design validation and production sample-basis

test and validation.