bcm4750 Broadcom Corp., bcm4750 Datasheet - Page 2

• Manufacturer Part Number: bcm4750
• Description: Bcm4750 - Single-chip Agps Solution
• Manufacturer: Broadcom Corp.

The BCM4750 is a single-chip, single-die GPS receiver IC fabricated on
90-nm RFCMOS technology. The BCM4750 integrates a high-
performance baseband section with a low-noise CMOS radio front end.
It is designed to interface with host processors in mobile phones, PDAs,
personal navigation devices (PNDs), and MP3 players. The BCM4750 is
a host-based GPS IC that delivers the highest positioning performance
yet uses the smallest PCB area in the market today.
Broadcom provides a software library that realizes the GPS navigation
solution in the host using minimum resources and with no real time
requirements. The BCM4750 uses a patent-pending innovative RF
design that improves both current consumption and LNA linearity as
well as allowing for a minimum number of external components used.
Broadcom has pioneered the concept of host-based GPS, where the
functionality is shared between the GPS IC and the host processor, as the
best compromise for cost and size while maintaining performance in
large volume mobile applications. Host-based GPS uses the GPS IC as a
Broadcom
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4750-PB01-R
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11/30/07
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BCM4750
RF Front End
BCM4750 Block Diagram
O V E R V I E W
IF
TCXO
Measurement Engine
High-Sensitivity
hardware accelerator that performs all the signal processing functions
related to the acquisition and tracking of the GPS signals, relieving the
GPS IC of a complete CPU subsystem including ROM, RAM, and other
needed peripherals.
Competing System-on-a-Chip (SOC) solutions often have navigation
algorithms hardcoded in ROM, resulting in products that are quickly
obsolete. Additionally, competing SOCs often use separate flash
memory that call for multi-die system-in-package products that are
bulkier and cost more than single-die solutions such as the BCM4750.
Host-based architectures are ideal for AGPS products where various
forms of aiding are used, since the aiding information typically comes
from the host CPU.
Requirements on the host CPU are minimum (few MIPS), and no real
time requirements are imposed. Communication with the host is done
through standard serial I/O protocols at very low bandwidth (down to 9.6
Kbps).
SERIAL
HOST CPU
GPS NAV
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Web: www.broadcom.com