发明名称 |
SLEW RATE ENAHNCEMENT CIRCUITRY FOR FOLDED CASCODE AMPLIFIER |
摘要 |
A folded-cascode operational amplifier including a differential input stage (19) and a class AB output stage (20) includes a first slew boost current mirror (13) and a second slew boost current mirror (14) having inputs connected to drains of the input transistors, respectively. Each current mirror amplifies excess tail current steered into it as a result of a large, rapid input signal transition. The amplified excess tail current is used to boost the slew rate of the class AB output stage. in accordance with a first polarity of the difference between the first (Vin+) and second (Vin-) input voltages. The drains of the input transistors are maintained at a voltage less than a transistor threshold voltage above the ground except during slewing operation of the operational amplifier to effectively isolate the current mirrors except during slewing operation.
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申请公布号 |
WO2006005040(A3) |
申请公布日期 |
2006.06.15 |
申请号 |
WO2005US23698 |
申请日期 |
2005.06.28 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED;JONES, MARK, A. |
发明人 |
JONES, MARK, A. |
分类号 |
H03F3/45;H03F3/04;H03F3/10;H03F3/30 |
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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