Only For Training And Service Purposes - LG KP330 Service Manual

Notes:
1. The analog baseband output pins from RTR6285/6280 are connected to the MSM ICs. Individual trace and load
capacitance should not to exceed 15 pF on the I or Q lines to the MSM. The I and Q load resistance and
capacitance should be equal.
2. Gain values account for unit conversion from the total input power (dBm) to the output voltage (dBV
component (I or Q).
3. Out-of-band jammer (blocker) input power that reduces the in-band output signal power by 1 dB.
4. Test conditions for third-order input intercept point measurements: CW input jammer level = -49 dBm at 800 kHz
offset, CW input jammer level = -49 dBm at 1650 kHz offset.
5. Test conditions for in-band second-order input intercept point measurements: CW input jammer #1 level = -33
dBm at 6000 kHz offset, CW input jammer #2 level = -33 dBm at 6050 kHz offset.
6. Noise figure must be met for 2:1 source VSWR in a 100-ohm system. Noise figure or output noise voltage is
integrated from 100 Hz to 100 kHz.
7. Performance specifications are based on measurements taken using a hybrid power splitter to create two 50-
ohm outputs that are 180 degrees out-of-phase
board connected by two coaxial cables, with calibrated traces to the RTR6285/6280 input and its matching
components. The matching circuit for IC-level testing is different than recommended handset designs. See the
RTR6285/6280 Device User Guide for recommendations. Performance specifications listed in the table include the
matching networks but not the hybrid splitter, coaxial cables, or calibrated PCB traces.
3.2.2 GSM 1800/1900 receive signal path
The GSM1800 receive signal path specifications given in this subsection are based on the test
input described in the
50-ohm single-ended test equipment even though the RTR6285/6280 IC requires a differential
signal at the GSM 1800 input (pins 36 and 37). Handset implementations are expected to
accomplish this single-ended to differential transformation using a SAW filter; the filter,
matching components, and PCB traces must provide adequate amplitude and phase balance
(≤ 1 .5 dB and ≤ 1 5 degrees, respectively).
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

KP330 Operational Description
KP330 Operational Description
KP330 Operational Description
(Figure
Figure 1.2-1
Table 1.2-2 notes. This test input allows measurements using standard
- 25 -
1.2-1). The result is a 100-ohm differential input to the test
3. TECHNICAL BRIEF
) of one
RMS
LGE Internal Use Only