CSR SiRFstarIV Location-Aware Architecture and SiRF GSD4t Receiver

CSR introduced the SiRFstarIV location-aware architecture. SiRFstarIV features SiRFaware self-assisted, micro-power GPS technology that enables consumer devices to always be location aware – without draining batteries and without requiring network aiding. CSR also announced the GSD4t receiver. which is a SiRFstarIV-based solution for enabling mobile phones and other space- and power-constrained devices to have the robust, always-available geo-awareness consumers are demanding. The SiRF GSD4t host-based GPS receiver is available now in sample quantities, with production quantities planned for October.

The SiRFstarIV architecture core consists of a high-performance GPS location engine, smart location sensor interface, adaptive micro-power manager, and active jammer remover.

SiRFstarIV Architecture

  • Twice the search capacity of the industry proven SiRFstarIII architecture, resulting in enhanced sensitivity, reduced time-to-fix and improved positional accuracy
  • Advanced micro-power management and integrated switched-mode regulation that maintains hot-start conditions with minimal energy (50-500 microamperes)
  • Intelligent MEMs sensor support (for accelerometers and other sensors) that improves the location experience, enabling greater contextual awareness, more sophisticated energy management and enhanced indoor positional accuracy
  • Advanced DSP technology that actively searches for jammers and removes them prior to correlation for maximum GPS performance and design troubleshooting

The SiRFstarIV can continually maintain “better-than-hot-start” conditions in the GPS receiver for fast location fixes without having to be kept fully turned on all the time and draining precious battery power. Until now, designers of mobile devices were forced to completely turn off GPS receivers when not in use to conserve power, causing annoying start-up delays when a location application needed to get a new location fix quickly. Through a fusion of multiple innovations, the unique SiRFaware technology overcomes this barrier with or without network aiding while consuming only 50-500 microamperes of current.

The GSD4t host-based platform is optimized for mobile phones and other space and power-sensitive consumer devices. The GSD4t receiver provides industry leading performance, with navigation to -160 dBm, tracking to -163 dBm and excellent pass margins for E911 and 3GPP. It can maintain its full rated -160 dBm acquisition sensitivity without network assistance. A low-power champion, the GSD4t receiver requires only 8 mW in 1-Hz TricklePower mode – two and a half times less than the industry benchmark SiRFstarIII.

SiRFstarIV GSD4t features active jamming removal, single-SAW design, an on-chip LNA, fail-safe I/O, integrated switchers, single supply voltage, simple RF matching, and small size and packaging. It is available in a 42-ball, 0.4 mm pitch wafer level chip scale package (WLCSP).

The GSD4t offers low integration and BOM costs and fast time-to-market, combining RF receiver, baseband, switcher and low-current LDOs on a single chip, and requiring only six to eight external passive components and a single SAW to provide a complete solution that occupies less than 20 square millimeters, including switcher parts.

More information: CSR