LG KU250 Service Manual - Page 16

Technical Brief

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3. TECHNICAL BRIEF 3. TECHNICAL BRIEF 3.1 General Description The U250/KU250 supports UMTS-2100, GSM-900, DCS-1800, and PCS-1900 based GSM/GPRS/UMTS. All receivers and the UMTS transmitter use the radio One1Zero-IF architecture to eliminate intermediate frequencies, directly converting signals between RF and baseband. The quadband GSM transmitters use a baseband-to-IF upconversion followed by an offset phase-locked loop that translates the GMSK-modulated signal to RF. UMTS (2100) GSM (900, 1800, 1900) Bluetooth 1. RTR6275 for GSM Tx and WCDMA Tx 2. RTR6275 for GSM Rx and WCDMA Rx 3. Bluetooth RF module 4. PM6650 for power management [Fig 1.1] Block diagram of RF part 1 QUALCOMM's branded chipset that implements a Zero-IF radio architecture. - 17 -

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3. TECHNICAL BRIEF
- 17 -
3.1 General Description
The U250/KU250 supports UMTS-2100, GSM-900, DCS-1800, and PCS-1900 based
GSM/GPRS/UMTS. All receivers and the UMTS transmitter use the radio One
1
Zero-IF architecture to
eliminate intermediate frequencies, directly converting signals between RF and baseband. The quad-
band GSM transmitters use a baseband-to-IF upconversion followed by an offset phase-locked loop
that translates the GMSK-modulated signal to RF.
UMTS (2100)
GSM (900, 1800, 1900)
Bluetooth
1. RTR6275 for GSM Tx
and WCDMA Tx
2. RTR6275 for GSM Rx
and WCDMA Rx
3. Bluetooth RF module
4. PM6650 for power
management
1
QUALCOMM’s branded chipset that implements a Zero-IF radio architecture.
3. TECHNICAL BRIEF
[Fig 1.1] Block diagram of RF part