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SGH-Z100 Circuit Description
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10. RFL6200 (U201)
The RFL6200 includes an LNA circuit optimized for UMTS-2100 operation. The LNA is separated from all other receive
functions contained within the RFR6200 receiver IC to improve mixer LO to RF isolation – a critical parameter in the
Zero-IF architecture.
11. RFR6200 (U202)
The RFR6200 provides the Zero-IF receiver signal path, from RF to analog baseband, for UMTS-2100 applications. The
RFR6200 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.
12. RTR6200 (U101)
The RTR6200 supports multi-band, multi-mode phones with two receiver signal paths and three transmitter signal paths:
1) Receiver paths
- EGSM-900
- DCS-1800
2) Transmitter paths
- EGSM-900 (using OPLL technique)
- DCS-1800 (using OPLL technique)
- 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, and UMTS Rx
4) Transceiver LO generation and distribution circuits
- EGSM-900 Rx and Tx
- DCS-1800 Rx and Tx
- UMTS-2100 Tx
2. Baseband Circuit description of SGH-Z100
1. PM6050
1.1. Power Management
Ten low-dropout regulators designed specifically for GSM applications power the terminal and help ensure optimal system
performance and long battery life. It provides seven LDO support for 2.6V, 2.8V while a self-resetting, electronically
fused switch supplies power to external accessories. Ancillary support functions, such as RTC module and RTC charger,
Clock Buffer, aid in reducing both board area and system complexity.
SBI BUS serial interface provides access to control and configuration registers. This interface gives
full control of the
MSM6200 and enables system designers to maximize both standby and talk times.
Supervisory functions. including a reset generator, an input voltage monitor, and a ADC Conertte support reliable system
design. These functions work together to ensure proper system behavior during start-up or in the event of a fault
condition(low microprocessor voltage, insufficient battery energy, or excessive die temperature).
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