Invention Grant
- Patent Title: Clock generator
- Patent Title (中): 时钟发生器
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Application No.: US11822749Application Date: 2007-07-10
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Publication No.: US07642869B2Publication Date: 2010-01-05
- Inventor: Hiroshi Fujii
- Applicant: Hiroshi Fujii
- Applicant Address: JP Kariya
- Assignee: DENSO CORPORATION
- Current Assignee: DENSO CORPORATION
- Current Assignee Address: JP Kariya
- Agency: Posz Law Group, PLC
- Priority: JP2006-201049 20060724
- Main IPC: H03K3/03
- IPC: H03K3/03

Abstract:
A clock generator includes a ring oscillator for outputting a basic signal, a divide-by-N frequency divider for dividing the basic signal by a division ratio N to generate a clock signal having a target frequency, a divide-by-two frequency divider for dividing the clock signal by two when an enable signal is on, a counter for counting the number of pulses of the basic signal for a predetermined period of time, a calculator for calculating the division ratio N, and a comparator for comparing a count value of the counter with a threshold value. When the count value of the counter is less than the threshold value, the comparator turns on the enable signal. Thus, when a temperature of the ring oscillator increases, the frequency of the clock signal is reduced to half the target frequency.
Public/Granted literature
- US20080018374A1 Clock generator Public/Granted day:2008-01-24
Information query
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