Super source follower output impedance enhancement
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United States of America Patent
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May 17, 2011
Grant Date -
Jul 22, 2010
app pub date -
Jan 21, 2009
filing date -
Jan 21, 2009
priority date (Note) -
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Abstract
A source follower circuit is disclosed with an added amplifier that extends the low input voltage linear range while providing a lower output impedance. The drain of the source follower MOSFET is coupled to a gain stage that drives a second MOSFET (or other type transistor) with its drain coupled to the follower output. High impedance current sources bias the circuitry, and the difference amplifier has a reference voltage at one input. The difference amplifier with the reference voltage provides a feedback mechanism that maintain adequate drain to source voltage across the follower MOSFET to enhance the low input voltage linearity along with reducing the follower output resistance.
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