发明授权
US5854574A Reference buffer with multiple gain stages for large, controlled
effective transconductance
失效
具有多个增益级的参考缓冲器，用于大的，受控的有效跨导
- 专利标题： Reference buffer with multiple gain stages for large, controlled effective transconductance
- 专利标题（中）： 具有多个增益级的参考缓冲器，用于大的，受控的有效跨导
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申请号： US639208申请日： 1996-04-26
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公开(公告)号： US5854574A公开(公告)日： 1998-12-29
- 发明人: Lawrence Singer , Todd L. Brooks
- 申请人： Lawrence Singer , Todd L. Brooks
- 申请人地址： MA Norwood
- 专利权人： Analog Devices, Inc.
- 当前专利权人： Analog Devices, Inc.
- 当前专利权人地址： MA Norwood
- 主分类号： H03F3/30
- IPC分类号： H03F3/30 ; H03F3/45 ; H03F1/34 ; H03F1/42
摘要：
A reference buffer suitable for driving switched-capacitor or resistive load circuits provides a very low output impedance. The reference buffer utilizes an amplifier with a very large and controlled transconductance configured in feedback and compensated by a load capacitance. Cascaded gain stages are used to provide a large, controlled transconductance. In one embodiment, a reference buffer amplifier includes a plurality of voltage gain amplifiers connected in cascade and at least one transconductance amplifier connected to a last-connected of the plurality of voltage gain amplifiers. The amplifier may further include at least one current mirror amplifier connected to the at least one transconductance amplifier. In another embodiment, the reference buffer amplifier includes at least one transconductance amplifier and at least one current mirror amplifier cascade-connected to the at least one transconductance amplifier. The amplifiers can be differential or single-ended.
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