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High efficiency linear amplifier
   
Document Number
US Patent 7362176
Issued Date
April 22, 2008
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Abstract
A linear amplifier is configured with a current-feedback amplifier followed by a voltage-feedback amplifier to drive a totem-pole output stage. The output stage includes a series arrangement of an npn transistor and a pnp transistor with their emitters coupled in series and to an output node. The voltage amplifier driving the output stage is also configured with totem-pole elements, wherein a conductive path between the voltage-feedback amplifier and an output transistor is included to reduce conduction of the output transistor when the opposing output transistor is driven to increase conduction as a result of a high-frequency input signal. A capacitor may be included between the collector and base of a transistor in the circuit path that drives an output transistor in the output stage to briefly reduce its conduction when the opposing output transistor is driven to increase conduction.
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Number of Claims:
18
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Published
April 22, 2008
Application Number
11/061,332
Filed
February 18, 2005
US Classification
330/267  
Int'l Classification
H03F   3/26   (20060101)  
Assistant Examiner
USPTO Field of Search
330/267   330/273   330/263   330/260   330/265   330/102   330/292  
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