| 摘要 |
PURPOSE:To reduce noise by identifying and reproducing an electric signal obtained from a digital optical signal through photoelectric conversion, inputting a digital electric signal obtained from the processing, generating a DC voltage different from an external power supply and feeding it back to a photoelectric conversion section. CONSTITUTION:A voltage obtained from the digital optical signal 21 through photoelectric conversion 22 is amplified 23. Its outout is identified by an identification circuit 24, inputted to a power supply circuit 26, subject to current amplification, the result is boosted by a transformer T then subject to voltage doubling and rectifying, and a DC high voltage is fed back to a photoelectric converter 22 via a ripple filter. Thus, a DC-DC converter comprising a low frequency oscillator with much noise is not required so as to improve remarkably the S/N. |
