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US 7,598,780 B2Granted
Clock buffer
AssigneeFujitsu Limited
InventorMasaya Kibune
Life of this patent
Estimating the term…
Abstract
A clock buffer has a band-pass frequency characteristic, in which a pass band of the buffer includes a fundamental frequency of a clock and a gain for attenuating signals, that is, a gain of less than 0 dB is provided at frequencies below the pass band.
Claims13
A clock buffer for waveform-shaping a clock, comprising:
- a buffer which, when the clock is input, changes the frequency characteristics;
- an ideal clock output circuit which outputs an ideal clock having an ideal waveform of the clock;
- a waveform detection circuit which detects a difference between a waveform of the clock and a waveform of the ideal clock;
- and
- a frequency characteristic change circuit which changes the frequency characteristics of the buffer according to the difference.
2 more elements
A clock buffer for waveform-shaping a clock, comprising:
- a buffer which, when the clock is input, changes the frequency characteristics;
- a spectrum detection circuit which detects a spectrum of the clock;
- and
- a frequency characteristic change circuit which changes the frequency characteristics of the buffer according to the spectrum.
1 more element
A clock buffer for waveform-shaping a clock, Comprising:
- a buffer which, when the clock is input, changes the frequency characteristics;
- a buffer control circuit which changes the frequency characteristics of the buffer;
- and
- a switching circuit which switches the buffer control circuit either to control the buffer according to the clock inputted to the buffer or to control the buffer according to the clock outputted from the buffer.
1 more element
Dependencies are inferred from the claim text.