发明申请
US20050264357A1 Gain boosted operational amplifier having a field effect transistor with a well biasing scheme
失效
增益升压运算放大器具有具有阱偏置方案的场效应晶体管
- 专利标题: Gain boosted operational amplifier having a field effect transistor with a well biasing scheme
- 专利标题(中): 增益升压运算放大器具有具有阱偏置方案的场效应晶体管
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申请号: US11123121申请日: 2005-05-06
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公开(公告)号: US20050264357A1公开(公告)日: 2005-12-01
- 发明人: Sandeep Gupta
- 申请人: Sandeep Gupta
- 申请人地址: US CA Irvine
- 专利权人: Broadcom Corporation
- 当前专利权人: Broadcom Corporation
- 当前专利权人地址: US CA Irvine
- 主分类号: H03F1/30
- IPC分类号: H03F1/30 ; H03F3/45
摘要:
A biasing scheme for a MOSFET that mitigates the MOSFET body effect. The biasing scheme can be realized replicating the voltage at the source terminal of a MOSFET and applying this replicated voltage to the body terminal. In this manner, the effect of the body transconductance, at high frequencies, becomes a function of the ratio of the well-to-substrate capacitance of the MOSFET to the sum of the well-to-substrate capacitance and the source-to-body capacitance of the transistor. At high frequencies, the biasing scheme mitigates the reduction in gain of a source follower caused by the body effect of a driven MOSFET within the source follower, improves the stability of a feedback network established by a gain boosting amplifier and the driven MOSFET by contributing a negative half plane zero to the transfer function of the feedback network, and reduces the power consumed by the gain boosting amplifier.
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