发明名称 |
Low noise level shifting circuits and methods and systems using the same |
摘要 |
A driver circuit includes an operational amplifier having an input and an output coupled by a feedback element. A voltage level shifter generates a voltage drop from the operational amplifier output to the operational amplifier input with a current source transistor setting a current controlling the voltage drop across the feedback element. A chopper circuit shifts flicker noise generated by the current source transistor to a higher frequency spectrum.
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申请公布号 |
US6946890(B1) |
申请公布日期 |
2005.09.20 |
申请号 |
US20040798661 |
申请日期 |
2004.03.11 |
申请人 |
CIRRUS LOGIC, INC. |
发明人 |
LEI TOM GONG;RUEGER TIMOTHY THOMAS;HODAPP STEPHEN TIMOTHY |
分类号 |
H03F3/45;H03L5/00;(IPC1-7):H03L5/00 |
主分类号 |
H03F3/45 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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