公开(公告)号：US07126889B2

公开(公告)日：2006-10-24

申请号：US10314821

申请日：2002-12-09

申请人： Koyu Yamanoi ,  Hironobu Murata ,  Aoe Takashi

发明人： Koyu Yamanoi ,  Hironobu Murata ,  Aoe Takashi

IPC分类号： G11B7/00

CPC分类号： G11B7/131 ,  G11B7/0901 ,  G11B7/0903 ,  G11B7/0943

摘要： A circuit to improve the SN characteristic of a tracking error signal. This tracking error detection circuit is formed as a push-pull system utilizing a quadrant type photo-detector and provided with 4 gain control amplifiers 20, 22, 24, and 26, 4 bottom envelope circuits 28, 30, 32, and 34, a pair of subtracting circuits 36 and 38, adding (subtracting) circuit 40, offset circuit 42, and gain control circuit 44. Bottom envelope circuits 28, 30, 32, and 34 are configured with a capacitor-type peak-hold circuit, for example, whereby bottom envelopes of RF signals SA, SB, SC, and SD given from light receiving areas A, B, C, and D of a photo-detector via gain control amplifiers 20, 22, 24, and 26 are detected, and bottom envelope signals SAbtm, SBbtm, SCbtm, and SDbtm representing the waveforms of the respective bottom envelopes are output.

摘要翻译： 一种提高跟踪误差信号的SN特性的电路。 该跟踪误差检测电路形成为利用象限型光检测器并具有4个增益控制放大器20,22,24和26,4个底包络电路28,30,32和34的推挽系统， 一对减法电路36和38，添加（减）电路40，偏移电路42和增益控制电路44.底包络电路28,30,32和34由电容器型峰保持电路构成，例如 ，由此检测通过增益控制放大器20,22,24和26从光电检测器的光接收区域A，B，C和D给出的RF信号SA，SB，SC和SD的底部信封，并且底部 输出表示相应底部信封的波形的包络信号SAbtm，SBbtm，SCbtm和SDbtm。