Reference timer for frequency measurement in a mic

专利名称：Reference timer for frequency measurement

in a microprocessor

发明人：Douglas R. Parker,Keng Wong申请号：US09607770申请日：20000630公开号：US06587800B1公开日：20030701

专利附图：

摘要：A timer on a microprocessor includes a vibrator formed by a comparator, acapacitor, three reference voltages, and switched current sources, which charge anddischarge the capacitor. The vibrator oscillates at two different amplitudes to generate

two timing windows, one at high amplitude and the other at low amplitude. A countercounts incoming clocks and times out after a fixed number of vibrator oscillations. Logicstarts the timing windows and subtracts incoming clock measurements taken during thetwo timing windows. The logic subtraction cancels errors accumulated from the multipleramps of the capacitor in the vibrator. The subtraction allows more precise measurementof incoming clocks. If the clocks counted exceed a threshold value, the microprocessorshuts down due to over clocking.

申请人：INTEL CORPORATION

代理机构：Blakely, Sokoloff, Taylor & Zafman LLP

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