| 摘要 |
<p>The invention provides an integrated photo monitor circuit ( 12 ), particularly an integrated photo monitor circuit ( 12 ) for CD and DVD applications, comprising a photo detector ( 14 ), an amplifier ( 16 ) for amplifying an output signal of said photo detector ( 14 ), and sampling circuitry ( 18 ) for sampling an output signal of said amplifier ( 16 ). The invention further provides an optical pickup unit ( 10 ), particularly an optical pickup unit ( 10 ) for CD and DVD applications, comprising means ( 20, 22 ) for emitting light, and means ( 12 ) for generating a sampled feedback signal ( 40 ) correlated to the output power of said means ( 20, 22 ) for emitting light and intended to be evaluated for controlling said output power of said means ( 20, 22 ) for emitting light. By providing the sampling function on the optical pickup unit ( 10 ), especially in an integrated photo monitoring circuit ( 12 ), the necessary bandwidth of a flex connection ( 32 ) between the optical pickup unit ( 10 ) and a printed circuit board ( 42 ) may be reduced compared to solutions where the sampling is done on the printed circuit board ( 42 ).</p> |
