| 摘要 |
By providing differential resistors in common emitters of pairs of differential transistor and differentially taking out signals from collectors, a circuit excellent in low noise property and linearity was obtained. Further, a ring type voltage controlled oscillation circuit is provided comprising n number of stages of variable delay circuits, a control signal generation circuit weighting n+1 outputs taken out of the voltage controlled oscillation circuit by a phase control signal voltage and controlling the phase, and a phase locked loop means for locking the phase by comparing the output of the voltage controlled oscillation circuit and an external pixel clock.
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