Frequency Synthesizer Circuit & Spurious Radiation Suppression Circuit - Samsung SCH-A302 Service Manual

2. Spurious Radiation Suppression Circuit
The spurious signal from antenna is suppressed at the duplexer. The duplexer has a flat characteristics to
the receive signal and a high attenuation characteristics to the harmonic signal of transmission.
So it suppress the spurious radiation
Table: The characteristic of CDMA duplexer filter(F302)
PARAMETER
Center Frequency
Bandwidth
Insertion Loss at BW
VSWR at BW
Input power
Attenuation
Ripple at BW
Center Frequency
Bandwidth
Insertion Loss at BW
VSWR at BW
Input power
Attenuation
Ripple at BW
Isolation
SCH-A302 Frequency Synthesizer circuit & Spurious radiation suppression circuit
T X
R X
T X to R X
SAMSUNG Proprietary-Contents may change without notice
836.5 MHz (F )
T
F ± 12.5 MHz
T
3.0 dB Max
1.8 Max
3.0 W Max
869 ~ 894 MHz 40 dB Min
1.6 dB Max
881.5 MHz (F )
R
F ± 12.5 MHz
R
4.0 dB Max
1.8 Max
1 W Max
824 ~ 849 MHz 56 dB Min
2.0 dB Max
824 ~ 849 MHz 55 dB Max
869 ~ 894 MHz 49 dB Max
4-2
VALUE