发明授权
US07733179B2 Combination trim and CMFB circuit and method for differential amplifiers
有权
差分放大器的组合调整和CMFB电路及方法
- 专利标题: Combination trim and CMFB circuit and method for differential amplifiers
- 专利标题(中): 差分放大器的组合调整和CMFB电路及方法
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申请号: US12288481申请日: 2008-10-21
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公开(公告)号: US07733179B2公开(公告)日: 2010-06-08
- 发明人: Brett E. Forejt
- 申请人: Brett E. Forejt
- 申请人地址: US TX Dallas
- 专利权人: Texas Instruments Incorporated
- 当前专利权人: Texas Instruments Incorporated
- 当前专利权人地址: US TX Dallas
- 代理商 John J. Patti; Wade J. Brady, III; Frederick J. Telecky, Jr.
- 主分类号: H03F3/45
- IPC分类号: H03F3/45
摘要:
A differential amplifier (10-1,2) includes an input stage (7) including first (M1) and second (M2) input transistors and first (4A) and second (4B) load devices. Sources of the first and second input transistors are connected together. Drains of the first and second input transistors are coupled by first (12) and second (13) conductors to the first and second load devices, respectively. Common mode feedback circuitry (6A) including first (M3), second (M4), and third (M5) transistors is combined with offset correction circuitry (8) including the second transistor and the third transistor. Sources of the first, second, and third transistors are coupled to a tail current source (11). Drains of the second and third transistors are coupled to the first and second conductors, respectively. A common mode voltage (VOCM) is applied to a gate of the first transistor. Offset trim voltages are applied to gates of the second and third transistors.
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