发明授权
- 专利标题: Amplifier unit and optical disc drive
- 专利标题(中): 放大器单元和光盘驱动器
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申请号: US11430241申请日: 2006-05-09
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公开(公告)号: US07391265B2公开(公告)日: 2008-06-24
- 发明人: Shinichi Miyamoto , Yousuke Kuroiwa , Masaya Ueda , Hideo Fukuda , Hiroshi Yamaguchi , Masaki Taniguchi
- 申请人: Shinichi Miyamoto , Yousuke Kuroiwa , Masaya Ueda , Hideo Fukuda , Hiroshi Yamaguchi , Masaki Taniguchi
- 申请人地址: JP Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Steptoe & Johnson LLP
- 优先权: JP2005-139189 20050512; JP2006-027813 20060206
- 主分类号: H03F3/45
- IPC分类号: H03F3/45 ; H03F3/08
摘要:
An amplifier unit is provided, with which the need for manufacturing a photoelectric conversion IC in Bi-CMOS process is eliminated, and relatively low process cost of the photoelectric conversion IC is achieved. The input section of a buffer (the base of a transistor Q5) is connected with a plurality of patterns of phase compensation circuits each including a resistor and a capacitor connected in series. A bipolar transistor (Q6) is interposed between a positive power supply line and a capacitor (C2) forming a capacitance of the phase compensation circuit. By switching on/off the bipolar transistor (Q6), the capacitance value and resistance value of the phase compensation circuit are switched. Since the bipolar transistor (Q6) is interposed between the capacitor (C2) and the positive power supply line, base current (Isw) acting as a switch signal does not affect the amplifier unit.
公开/授权文献
- US20060202761A1 Amplifier unit and optical disc drive 公开/授权日:2006-09-14