| 摘要 |
The present invention discloses a circuit for controlling a pulse width including a frequency detection circuit for extracting an operation frequency band by receiving an external clock, delaying the external clock for a different time and comparing a frequency of the external clock with frequencies of the external clocks delayed for the different time, respectively, and outputting a plurality of mode signals according to the operation frequency band; and a pulse generation circuit for generating a pulse having its width varied by the operation frequency, by using a delay time based on the plurality of mode signals from the frequency detection circuit. As a result, the circuit for controlling the pulse width can be applied to a next generation standard DRAM such as a high speed DDR2 or DDR3 as well as a high speed graphic DRAM for supporting various operation frequencies.
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