A/D conversion circuit and optical disk drive

Details A/D conversion circuit and optical disk drive A/D conversion circuit and optical disk drive

2007-09-21

2009-06-02

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Detecting analog signal peak

C369S059170, C341S155000

Reexamination Certificate

active

07541955

ABSTRACT:
An A/D conversion circuit converts an asymmetric analogue signal into a digital signal. In an A/D conversion circuit of a parallel type, a central value of a reference voltage is adjusted by means of an average of an input analogue signal, such as a reproduced RF signal from an optical disk, or the like. The average value of the input analogue signal is detected by means of a low-pass filter (LPF). Respective comparators compare the input analogue signal with the reference voltage, and encodes a result of comparison by means of an encoder. An A/D conversion characteristic determined by voltage values from a maximum value Vref1to an average value and another A/D conversion characteristic determined by voltage values from the average value to a minimum value Vref2become nonlinear, thereby becoming able to address asymmetry of the input analogue signal.

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