GPS receiver with extended hot start capability
AssigneeSkytraq Technology, Inc.
InventorYi-Ping Huang
Life of this patent
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Abstract
A global positioning system (GPS) receiver with extended 1-second hot start capability has an RF chip, a baseband chip, a battery and a LDO regulator. When the GPS receiver is turned on, a main supply voltage charges the battery to store backup power. Once the main supply voltage is turned off, the baseband starts a countdown period. During the countdown period, critical portion of the RF chip, the baseband chip and the regulator use the backup power to continue keeping time. If the GPS receiver is restarted during the countdown period, the GPS receiver has retained information to allow 1-second hot start and the GPS receiver generates position fix instantaneously.
Claims6
A global positioning system (GPS) receiver with extended 1-second hot start capability comprising:
- a real time clock unit, a backup SRAM and a power down timer in a first independent power domain (VCC2) within a GPS baseband chip;
- a precise timing control unit in a second independent power domain (VCC3) within the GPS baseband chip;
- a low drop regulator (LDO) controlling power supplied to a temperature-compensated crystal oscillator (TCXO) and the precise timing control unit;
- a radio frequency (RF) chip with a power down mode controlled by signals from the GPS baseband chip.
Dependencies are inferred from the claim text.