发明授权
US06696894B1 Operational amplifier with independent input offset trim for high and low common mode input voltages
有权
具有独立输入偏移微调的运算放大器,用于高和低共模输入电压
- 专利标题: Operational amplifier with independent input offset trim for high and low common mode input voltages
- 专利标题(中): 具有独立输入偏移微调的运算放大器,用于高和低共模输入电压
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申请号: US10192189申请日: 2002-07-08
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公开(公告)号: US06696894B1公开(公告)日: 2004-02-24
- 发明人: Yuhong Huang
- 申请人: Yuhong Huang
- 主分类号: H03F345
- IPC分类号: H03F345
摘要:
An operational amplifier provides independent trimming of Vos for both high and low common mode input voltages. The amplifier includes complementary input pairs, and employs a steering circuit which provides a tail current Itail to one pair when Vcm is less than a threshold voltage Vth, and provides Itail to the other pair when Vcm>Vth. The input pairs drive a load stage which includes one or more trim inputs that enable Vos to be varied with one or more trim signals applied to the trim inputs. A first trim signal generating circuit provides a first trim signal only when Vcm Vth. This allows the input offset voltages at high and low Vcm to be adjusted independently.