发明申请
- 专利标题: LOW DROPOUT CURRENT SOURCE
- 专利标题(中): 低压差电流源
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申请号: US13155556申请日: 2011-06-08
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公开(公告)号: US20120019322A1公开(公告)日: 2012-01-26
- 发明人: Pradeep Charles Silva , Praveen Varma Nadimpalli , Joseph Hubert Colles
- 申请人: Pradeep Charles Silva , Praveen Varma Nadimpalli , Joseph Hubert Colles
- 申请人地址: US NC Greensboro
- 专利权人: RF MICRO DEVICES, INC.
- 当前专利权人: RF MICRO DEVICES, INC.
- 当前专利权人地址: US NC Greensboro
- 主分类号: H03F3/45
- IPC分类号: H03F3/45 ; G05F1/575
摘要:
Disclosed is a low dropout current source that includes a first field effect transistor (FET), a second FET having a drain that is an output for an output voltage and an output current, and a third FET, wherein a gate of the first FET is coupled to both a gate of the second FET and a drain of the third FET, and wherein a drain of the first FET is coupled to a source of the third FET. A differential amplifier has an inverting input coupled to the drain of the first FET, a non-inverting input coupled to the drain of the second FET and an amplifier output coupled to the gate of the third FET. A current reference is coupled between the drain of the third FET and a fixed voltage node. The current reference provides a reference current that is multiplied and output from the third FET.
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