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3. TECHNICAL DESCRIPTION
3.1.16 A-GPS
GT500 supports A-GPS operation using Broadcom BCM4750 A-GPS module.
The BCM4750 is a single chip, single die AGPS receiver that combines a high-performance RF front end with
an adaptive baseband processor. The BCM4750’s small footprint and minimal parts count provide significant
reductions in the design, layout, manufacturing, and testing resources required to integrate AGPS
technology with mobile handsets and portable devices.
The BCM4750 uses a host-based integration architecture that splits processing functions between the GPS
chip and the CPU on the host system. Host-based architecture enables a simplified IC design that can be
executed in a much smaller and less expensive package than competing System on Chip solutions which
require an onchip CPU subsystem and flash memory in addition to the RF and baseband blocks. Demands
on the host CPU are minimal and no real time requirements are imposed.
Feature
• Fully integrated GPS RF front-end and baseband processor on a single CMOS die
• Supports UART, I2C, and SPI host interfaces
• Industry-leading power consumption efficiency
• Synchronization input, PPS output
• Fractional-N Synthesizer supports reference frequencies from 10 to 40 MHz
• Companion software driver supports Assisted, Autonomous, and Enhanced Autonomous operating mode
Figure 3-1-16. Functional Block Diagram of BCM4750
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