| 摘要 |
<p>PURPOSE:To generate a high frequency clock by using a low speed crystal oscillator. CONSTITUTION:In the high frequency clock generating circuit provided with a reference oscillator 1, a phase variable circuit section 2 receiving a reference clock from the reference oscillator 1 and providing an output of (2<n>-1) sets of clocks having a phase difference of pi/2<n> (n=1, 2, 3...) and n-sets of logic circuit sections in cascade connection by n-stages, an m (m=1, 2,...n-1)-th stage logic circuit section receives 2<n+1-m>) sets of clocks having a phase difference of pi/2<n+1-m> each, outputs 2<n-m> sets of clocks having a multiple of frequency of the received clock and having a phase difference of pi/2<n-m> each by comparing the two clocks having a phase difference of pi/2 and 2<n> sets of clocks from the reference oscillator 1 and the phase variable circuit section 2 are inputted to 1st stage logic circuit sections 3-6.</p> |
