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    • 66. 发明授权
    • Semiconductor memory device
    • 半导体存储器件
    • US06847561B2
    • 2005-01-25
    • US10652920
    • 2003-08-28
    • Kiyokazu HashimotoHiroshi Furuta
    • Kiyokazu HashimotoHiroshi Furuta
    • G11C16/06G11C7/06G11C7/14G11C16/04G11C16/08G11C16/28G11C7/00
    • G11C16/349G11C7/062G11C7/067G11C7/14G11C16/28
    • A semiconductor memory device includes (a) a plurality of reference cells, (b) a plurality of memory cells, data stored in a selected reference cell among the reference cells being compared to data stored in a selected memory cell among the memory cells, (c) an address transition detector for detecting transition in input of addresses by which a memory cell is selected among the memory cells, and transmitting an address transition detecting signal indicative of the detected transition, (d) a counter for counting the address transition detecting signals, and (e) a reference cell decoder for selecting a reference cell among the reference cells in accordance with an output transmitted from the counter.
    • 半导体存储器件包括:(a)多个参考单元,(b)多个存储器单元,存储在所述参考单元中的所选择的参考单元中的数据与存储在所述存储单元中的所选存储单元中的数据进行比较; c)地址转换检测器,用于检测存储器单元中选择存储单元的地址的转换,以及发送表示检测到的转移的地址转变检测信号,(d)用于对地址转变检测信号进行计数的计数器 ,以及(e)参考单元解码器,用于根据从计数器发送的输出来在参考单元中选择参考单元。
    • 67. 发明授权
    • Tracking error signal detector
    • 跟踪误差信号检测器
    • US06704258B2
    • 2004-03-09
    • US10148529
    • 2002-05-29
    • Eiji UedaYasumori HinoTakashi InoueHideki OhyamaKiyokazu Hashimoto
    • Eiji UedaYasumori HinoTakashi InoueHideki OhyamaKiyokazu Hashimoto
    • G11B700
    • G11B7/0938G11B7/0901G11B7/0904
    • A tracking error signal detector includes: a photodetector (103) for detecting reflected light from an optical recording medium having a servo area provided with a first wobble mark and a second wobble mark; an amplifier (104) for producing a summation signal of the reflected light; a sampling portion (105) for sampling the summation signal; a first arithmetic portion (106) for calculating an extremum of the summation signal in the vicinity of reproduction timing for each of the first and second wobble marks from the sampling values so as to produce first and second extremums; and a second arithmetic portion (107) for producing a tracking error signal that corresponds to a difference between the first and second extremum. The tracking error signal detector can produce a high-accuracy tracking error signal even if sampling is performed with an asynchronous clock relative to the summation signal.
    • 跟踪误差信号检测器包括:用于检测来自具有设置有第一摆动标记和第二摆动标记的伺服区域的光学记录介质的反射光的光电检测器(103) 用于产生反射光的求和信号的放大器(104); 采样部分(105),用于对所述求和信号进行采样; 第一算术部分(106),用于根据所述采样值计算所述第一和第二摆动标记中的每一个的再现定时附近的求和信号的极值,以产生第一和第二极值; 以及用于产生对应于第一和第二极值之间的差的跟踪误差信号的第二运算部分(107)。 即使采用相对于求和信号的异步时钟进行采样,跟踪误差信号检测器也可产生高精度跟踪误差信号。