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2. Circuit Description
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2-1
2-1. SGH-ZV30 RF Circuit Description
- Antenna Switch Module (U106)
The antenna switch module allows multiple operating bands and modes to share the same antenna. A common
antenna connects to one of five paths: 1) UMTS-2100 Rx/Tx, 2) EGSM-900 Rx, 3) EGSM-900 Tx, 4) DCS-1800
Rx, and 5) DCS-1800 Tx. 6) PCS-1900 Tx, 7) PCS-1900 Rx, UMTS operation requires simultaneous reception and
transmission.
- Filter
To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency band.
- GSM Rx FILTER (F100) : For filtering the frequency band between 925 ~ 960 MHz.
- DCS Rx FILTER (F101) : For filtering the frequency band 1805 and 1880 MHz.
- PCS Rx FILTER (F102) : For filtering the frequency band 1930 and 1990 MHz.
- WCDMA Rx FILTER (F201) : For filtering the frequency band 2110 and 2170 MHz.
- WCDMA Tx FILTER (F202) : For filtering the frequency band 1920 and 1980 MHz.
- VCTCXO (OSC201)
To generate the 19.2MHz reference clock to drive the logic and RF.
- Duplexer (F204)
A duplexer splits a single operating band into receive and transmit paths.
- UMTS PAM (U202)
This is a key component in the transmitter chain and must complement the RTR6250 IC precisely; jointly they
dominate the UMTS transmitter performance characteristics. Parameters such as gain, output power level, ACLR,
harmonics, Rx-band noise, and power supply current are critical.
- GSM/DCS/PCS PAM (U105)
The PAM is a key component in any transmitter chain and must complement the rest of the transmitter
precisely.For GSM, DCS, PCS operation, the closed-loop transmit power control functions add even more
requirements relative to the UMTS PA. In addition to gain control and switching requirements, the usual RF
parameters such as gain, output power level, several output spectrum requirements, and power supply current are
critical..
