AN4494 datasheet(28/34 Pages) STMICROELECTRONICS

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Sensitivity test

AN4494

Sensitivity test

9.1

Test case specification identifier

SENSITIVITY_TEST

9.2

Test prerequisite

It is possible to adopt two different hardware configurations for this test:

A signal generator (ex. the Agilent E4438C, controlled through a GPIB interface) as Tx

and the STEVAL-IDB002V1 motherboard connected to the DUT (device under test) as

shown in Figure 1: "UFL connector".

STEVAL-IDB002V1 complete kit as Tx device and STEVAL-IDB002V1 motherboard

connected to the BlueNRG DUT

9.3

Test description

The aim of this test is to verify the sensitivity level of the BlueNRG board.

9.4

Test setup

9.4.1

Hardware

Tx: Agilent E4438C signal generator or STEVAL-IDB002V1 kit

Rx: STEVAL motherboard connected to the BlueNRG DUT board (see Figure 1: "UFL

connector").

9.4.2

Software

ST BlueNRG GUI.

9.5

Test procedure

Two procedures can be used.

9.5.1

Signal generator & BlueNRG

The sensitivity can be evaluated by performing the following steps:

Connect the instrument and the DUT with an RF cable (with no significant loss).

Start Rx on DUT: HCI_LE_RECEIVER_TEST

Make the generator send X packets (well formatted as described in “Direct Test

Mode”, Vol. 6, Part F, and “Host Controller Interface Functional Specification”, VOL. 2,

Part E, in point Section 11: "Reference")

Stop test on DUT: HCI_LE_TEST_END

This will return Y as the number of received packets. PER is 1-Y/X.

If PER is below 0.308 (30.8%), go back to step b and decrease the power of the transmitter

by one step. If PER goes above 0.308, then the level of power emitted by the equipment in

the previous test is the sensitivity of the receiver.

The algorithm can be made more accurate by reducing the power level step when it is

close to the sensitivity level.

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