公开(公告)号：US20110298642A1

公开(公告)日：2011-12-08

申请号：US13210863

申请日：2011-08-16

申请人： Daisuke NOMASAKI ,  Takeshi OKUMOTO

发明人： Daisuke NOMASAKI ,  Takeshi OKUMOTO

IPC分类号： H03M1/10 ,  H03K17/687

CPC分类号： H03F3/345 ,  G05F3/26 ,  H03F2200/252 ,  H03F2200/417 ,  H03F2203/45136 ,  H03F2203/45646 ,  H03M1/1019 ,  H03M1/44

摘要： A current is generated from a reference voltage using an operational amplifier. The current is mirrored by a current mirror circuit to obtain a reference current. For example, the current mirror circuit includes a plurality of PMOS transistors. Based on the result of measurement of the reference current by an external monitor, the connection destination of the gate voltage of each of a plurality of mirror destination current source transistors is switched by an analog switch circuit between a power supply and the gate of a mirror source current source transistor, thereby changing the number of mirror destination current source transistors which are turned on, to change a current minor ratio. Thus, the current can be trimmed.

摘要翻译： 使用运算放大器从参考电压产生电流。 电流由电流镜电路镜像，以获得参考电流。 例如，电流镜电路包括多个PMOS晶体管。 基于由外部监视器测量参考电流的结果，多个镜像目的电流源晶体管中的每一个的栅极电压的连接目的地由电源和镜的栅极之间的模拟开关电路切换 源电流源晶体管，从而改变导通的镜像目的电流源晶体管的数量，以改变当前较小的比率。 因此，可以修剪电流。