Invention Grant
- Patent Title: Wireless device with a non-compensated crystal oscillator
- Patent Title (中): 带无补偿晶体振荡器的无线设备
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Application No.: US11269360Application Date: 2005-11-07
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Publication No.: US08014476B2Publication Date: 2011-09-06
- Inventor: Daniel F. Filipovic , Charles J. Persico , Christopher C. Riddle
- Applicant: Daniel F. Filipovic , Charles J. Persico , Christopher C. Riddle
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM, Incorporated
- Current Assignee: QUALCOMM, Incorporated
- Current Assignee Address: US CA San Diego
- Agent Kenyon S. Jenckes; William M. Hooks
- Main IPC: H04L27/06
- IPC: H04L27/06

Abstract:
A wireless device achieves good performance using a crystal oscillator that is not compensated for temperature. The crystal oscillator provides a reference signal having a temperature dependent frequency error. A control unit estimates the frequency error (e.g., based on a received pilot) and provides a frequency error estimate. A clock generator generates a digital clock, which tracks chip timing, based on the reference signal and the frequency error estimate. A receiver frequency downconverts an input RF signal with a receive LO signal having the frequency error and provides an analog baseband signal. An ADC digitizes the analog baseband signal based on a sampling clock having the frequency error and provides ADC samples. A re-clocking circuit re-clocks the ADC samples based on a digital clock and provides data samples. A digital rotator frequency translates the data samples based on the frequency error estimate and provides frequency-translated samples centered near DC.
Public/Granted literature
- US20070104298A1 Wireless device with a non-compensated crystal oscillator Public/Granted day:2007-05-10
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