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1. 发明申请

US20110260796A1 BIAS CIRCUIT, POWER AMPLIFIER, AND CURRENT MIRROR CIRCUIT 有权
标题翻译：偏置电路，功率放大器和电流反射器电路
公开(公告)号：US20110260796A1
公开(公告)日：2011-10-27
申请号：US13089454
申请日：2011-04-19
申请人： Satoshi TANAKA , Fuminori MORISAWA , Makoto TABEI
发明人： Satoshi TANAKA , Fuminori MORISAWA , Makoto TABEI
IPC分类号： H03F3/04
CPC分类号： H03F1/301 , G05F3/262 , H03F3/193 , H03F2200/18
摘要： There is provided a bias circuit that can operate even at low voltage and control a current reflecting a change in drain voltage. A first current mirror circuit for feeding back a drain terminal current of an FET which receives an output of an operational amplifier at a gate terminal to an input terminal of the operational amplifier and a second current mirror circuit are coupled in parallel. A variable voltage is coupled to the first current mirror circuit, and a fixed voltage is coupled to the second current mirror circuit. Even if the variable voltage becomes lower than the threshold voltage of FETs configuring the first current mirror circuit, the second current mirror circuit feeds back the current to the input terminal of the operational amplifier with reliability.
摘要翻译：提供了即使在低电压下也能够工作并且控制反映漏极电压变化的电流的偏置电路。用于将接收栅极端的运算放大器的输出的FET的漏极端子电流反馈到运算放大器的输入端的第一电流镜电路和第二电流镜电路并联。可变电压耦合到第一电流镜电路，并且固定电压耦合到第二电流镜电路。即使可变电压变得低于构成第一电流镜电路的FET的阈值电压，第二电流镜电路可靠地将电流反馈到运算放大器的输入端。

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