发明名称 Automatic frequency calibration
摘要 Disclosed is a system and method for providing an oscillating signal of relatively precise frequency without using a signal provided by a crystal as a reference. Disclosed is a feedback oscillator circuit configured to output an oscillating signal having a frequency defined by a reference signal. The oscillating signal can be sent to one or more circuits including at least one frequency sensitive element. The frequency sensitive element produces an output signal which depends on the frequency of the oscillating signal. A controller controls the reference signal in order to cause an attribute of the output signal to have a value within a desired range.
申请公布号 US2008157882(A1) 申请公布日期 2008.07.03
申请号 US20070649966 申请日期 2007.01.03
申请人 APPLE INC. 发明人 KRAH CHRISTOPH HORST
分类号 H03L7/00 主分类号 H03L7/00
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