发明名称 |
Operational amplifier with less offset |
摘要 |
A differential amplifier includes an input stage circuit including a first differential pair and a second differential pair which are complementary to each other; a first current mirror circuit connected with the first differential pair and configured to function as an active load; a second current mirror circuit connected with the second differential pair and configured to function as an active load; an output stage circuit having a pair of output transistors connected in series between a higher power supply and a lower power supply; an operation point setting circuit configured to set an operation point of the output transistors; and a floating constant current source connected between an input terminal of the first current mirror circuit and an input terminal of the second current mirror circuit, and configured to supply a constant current. The first current mirror circuit and the second current mirror circuit supply superimpose an output of the input stage circuit on a current corresponding to the constant current by the floating constant current source to supply to the operation point setting circuit.
|
申请公布号 |
US7405622(B2) |
申请公布日期 |
2008.07.29 |
申请号 |
US20060398546 |
申请日期 |
2006.04.06 |
申请人 |
NEC ELECTRONICS CORPORATION |
发明人 |
NISHIMURA KOUICHI;SHIMATANI ATSUSHI;ICHIMURA MOTOYASU |
分类号 |
H03F3/26 |
主分类号 |
H03F3/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|