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3. TECHNICAL BRIEF
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3.1 General Description
The KS20 supports UMTS-2100, GSM-900, DCS-1800, and PCS-1900 based
GSM/GPRS/EDGE/UMTS. All receivers and the UMTS transmitter use the radioOne
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 or 8-PSK-modulated signal to RF.
1
QUALCOMM’s branded chipset that implements a Zero-IF radio architecture.
3. TECHNICAL BRIEF
[Fig 1.1] Block diagram of RF part
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