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2. Circuit Description
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2-1
2-1. SGH-Z150 RF Circuit Description
- Antenna Switch Module (U600)
The antenna switch module allows multiple operating bands and modes to share the same antenna. A common
antenna connects to one of seven 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 (F600)
→
For filtering the frequency band between 925 and 960 MHz.
· DCS Rx FILTER (F601)
→
For filtering the frequency band between 1805 and 1880 MHz.
· PCS Rx FILTER (F602)
→
For filtering the frequency band between 1930 and 1990 MHz.
· WCDMA Rx FILTER (F700)
→
For filtering the frequency band between 2110 and 2170 MHz.
· WCDMA Tx FILTER (F701)
→
For filtering the frequency band between 1920 and 1980 MHz.
- VCTCXO (TCX700)
To generate the 19.2MHz reference clock to drive the logic and RF.
- Duplexer (F702)
A duplexer splits a single operating band into receive and transmit paths.
- WCDMA PAM (PAM702)
This is a key component in the transmitter chain and must complement the RTR6200 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 (PAM602)
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.
- GSM/DCS/PCS Dual Tx VCO (VCO600)
The dual Tx VCO outputs, one for EGSM and one for DCS/PCS, drive a resistive network that splits the active
signal into two signals: 1) the input to the active PAM which is the low loss path, and 2) the OPLL feedback signal.
- RFR6250 (U701)
The RFR6250 provides the Zero-IF receiver signal path, from RF to analog baseband, for UMTS-2100 applications.
The RFR6250 includes an LNA circuit optimized for UMTS-2100 operation and a VCO which generate UMTS Rx LO
signal. The RFR6250 accepts its UMTS input signal from the handset RF front-end design. The UMTS input is
configured differentially to optimize second-order inter-modulation and common mode rejection performance, and
implements MSM-controlled gain adjustments to extend the receiver dynamic range.