10.Intermodulation Test SOP

Conducted Intermodulation rejection

1.Test Purpose:

The intermodulation rejection is a measure of the capability of the receiver to receive a wanted modulated signal without exceeding a given degradation due to the presence of two or more unwanted signals with a specific frequency relationship to the wanted signal frequency.

The intermodulation attenuation is the ratio of the power level of the wanted signal to the power level of an intermodulation component. It is a measure of the capability of the transmitter to inhibit the generation of signals in its non-linear elements caused by the presence of the carrier and an interfering signal reaching the transmitter via the antenna, or by non linear combining and amplification of multiple carriers.

2.Instrument for Test:

(1) Universal Radio Communication Tester CMU 200 or Agilent 8960.

(2) DC Power supply - Agilent E3631A or E3642A.

(3) Agilent or R&S signal generator.

3.Test Condition:

Temperature Supple V oltage

NTC 25℃ 3.8 V olt

ETC (L) -20℃ 3.4 V olt

ETC (H) 60℃ 4.2 V olt

I. Manual Settings: ◎ For general part:

(1) Finish the connection of test structure.

(2) Set the power supply voltage to test condition.

(3) Turn on the power of Agilent 8960, power supply and signal generator, wait for at least 15 minutes.

◎ For 8960 part:

(1) Set the compensation loss values: (8960 to MS: Cable Loss 1)

(3) Set BCH parameters:

(4) Set TCH Parameters:

(5) Set IMEI number:

The number is ?001011234567890? or ?001010123456789?.

(6) Establish a call connection:

See Press See

RF IN/OUT Amptd Offset RF IN/OUT Ampted Offset Setup BCH Parameter Cell Power

Cell Band Broadcast Chan

Set BCH Cell Power Set BCH Cell Band

Set BCH Broadcast Channel TCH Parameter Traffic Band Traffic Chan Set TCH Cell Band Set TCH Cell Channel Originate Active Cell

Idle

Active Cell Alerting Set the compensation frequencies and values of Cable Loss 1

Pick up the phone

◎ For signal generator part:

ESG (Modulation)

(1)

Press

(2) Press

(3) Digital modulation setting

Active Cell Connect

Set test power level Set test frequency

(4) Check

(5) Press

ESG (Unmodulation)

(1) Press

(2) Press

(3) Press

(4) Press

◎ Measurement part:

Press

Press

(1) Increasing the power level(dBm) of ESGs until the 8960 BER value is higher than 2.4%, record the maximum power level values which 8960 BER is equal or smaller than 2.4% and check if these two values are all higher than test specification. (2) Change the test frequencies of ESGs and repeat the step (1).

Set test power level Set test frequency BER

Frequency Level

Set test frequency Set test power level

Set to modulation off Set to RF on Set to modulation on Set to RF on

II.

Software Settings:

(1) ESG resource name:

Set the GBIP address of signal generators used to generate the interference signals.

(2) BER Specification:

According to ETSI specification, the limit specification of bit error rate is 2.439%.

(3) Measured times:

At specific cell power level and BER burst counts, if the measured BER value is smaller than the BER specification value, the test program will decrease the cell power one step level and repeat the BER measurement until measured BER value is bigger than the BER specification value. The final passed cell power level is called the sensitivity of the mobile phone under test. The measured times value is the times which BER measurement will be done at the specific cell power level. (4) Type of test:

You can select ?only pass/fail? or ?sensitivity? in this item. If you select ?only pass/fail?, you should set the value of pass/fail margin , the test program should follow the spec. To check the test result is in spec.(Pass) or out of spec.(Fail). Test result would show pass or fail ; ?sensitivity? the test result would only show sensitivity and it?s corresponding sensitivity

values in four supported bands.

(5)The margin value of pass/fail:

According to item (4). If you select ?only Pass/Fail?, you will set the margin value.

(6)TCH setting block:

You can set the TCH (Traffic channel) numbers that you want to test in four supported bands.

(7)Test ETC:

User can select ?Yes? or ?No? in this block. If ?Yes? is selected, the test program will do the voltage and temperature in accordance with the setting of General Setup. If ?No? is selected, the test will be done only under normal voltage and normal temperature.

(8)The loss values setting block:

Compensation values of the path loss including ESG1 to DUT and ESG2 to DUT in four supported bands

6.Test Specification:

(1)EU Band (GSM900 & DCS1800)

(2)US Band (GSM850 & PCS1900)

Some of the levels in table 1 are different to those specified in GSM 05.05 due to the consideration the effect of modulation sideband noise from the second interferer.

Table 1: Intermodulation test signal levels

The error rate measured in this test shall not exceed the test limit error rate values given in table 2.This shall apply under normal condition and under any combination of normal and extreme test voltages and ambient temperature, and with the two interfering signals at either side of the wanted frequency.

Table 2: Limits for intermodulation rejection

7.Notice:

You must check the following items before test:

(1)Compensation loss value of each path at each tested frequency is

correct.

(2)It is recommended that using a 3dB attenuator between the instrument

and the DUT to eliminate the mismatch effect.

(3)If you use auto test program to process this test, you must ensure that

the GPIB address settings of the instrument and the test program are the same.