SOLID-STATE IMAGE PICKUP DEVICE

摘要

PURPOSE:To obtain a solid-state image pickup device not generating pulse noise from a PLL section by adopting PLL constitution to a drive system of the solid-state image pickup element to select optionally number of picture elements of the solid-state image pickup element. CONSTITUTION:A caption 10 is one input to a phase comparator 12 and a horizontal synchronizing signal (WHD) outputted from a synchronizing signal generator. Further, a frequency of a clock 19 for element drive is 8MHz and a signal subjected to 512-stage shift by a shift register circuit 18 is other input 11 to the phase comparator 12. The said two inputs are inputted to the phase comparator 12. A caption 14 is a low-pass filter extracting a DC potential from an output 13 of the phase comparator 12. The output of the low pass filter 14 is inputted to a voltage controlled oscillator circuit 16 to generate a pulse 17 in frequency 8MHz. The clock pulse 17 is fed back to the phase comparator 12 through the shift circuit 18 as the PLL constitution. Through the constitution above, no count-down at all is attained.