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Operational amplifier output stage and method
   
Document Number
US Patent 7271663
Issued Date
September 18, 2007
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Abstract
An operational amplifier includes an input stage for producing a voltage signal in response to an input signal. An output stage includes an output transistor having a source coupled to a supply voltage and a gate coupled to receive the voltage signal. An output cascode transistor has a source coupled to a drain of the output transistor and a drain coupled to an output conductor. A gate control amplifier includes an input stage including a first input transistor having a control electrode coupled to the source of the output cascode transistor and an active load transistor, the input transistor and the active load transistor being coupled to a gate of the output cascode transistor. The gate control amplifier also includes a feedback amplifier having an input coupled to the source of the output cascode transistor and an output coupled to a control electrode of the active load transistor.
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Number of Claims:
20
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Published
September 18, 2007
Application Number
11/210,036
Filed
August 23, 2005
US Classification
330/311  
Int'l Classification
H03F   1/22   (20060101)  
Examiner
Assistant Examiner
USPTO Field of Search
330/311   330/98   330/99   330/100   330/310   330/133   330/150   330/192   330/267   330/264  
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