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Circuit Description
2-2
- S1M8691X (U200)
The S1M8691X includes an LNA circuit optimized for UMTS-2100 operation. The LNA is separated from all other
receive functions contained within the S1M8691X receiver IC to improve mixer LO to RF isolation a critical parameter
in the Zero-IF architecture.
- S1M8621X (U615)
The S1M8621X provides the Zero-IF receiver signal path, from RF to analog baseband, for UMTS-2100 applications.
The S1M8621X 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.
- RTR6250 (U101)
The RTR6250 supports multi-band, multi-mode phones with two receiver signal paths and three transmitter signal
paths:
1) Receiver paths
- EGSM-900
- DCS-1800
- PCS-1900
2) Transmitter paths
- EGSM-900 (using OPLL technique)
- DCS-1800 (using OPLL technique)
- PCS-1900
- UMTS-2100
Numerous secondary functions are integrated on-chip as well:
3) Phase-locked loop circuits
- PLL#1 and an on-chip VCO supports UMTS Tx
- PLL#2 and an external VCO supports EGSM Rx and Tx, DCS Rx and Tx, DCS Rx and Tx and UMTS Rx
4) Transceiver LO generation and distribution circuits
- EGSM-900 Rx and Tx
- DCS-1800 Rx and Tx
- PCS-1900 Rx and Tx
- UMTS-2100 Tx
