Voltage buffer for input voltages above a supply voltage or below ground voltage
First Claim
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1. Apparatus, comprising:
- a buffer amplifier comprising a source follower and a feedback amplifier, the feedback amplifier configured to control a drain current of the source follower to remain substantially constant independent of a load, wherein the buffer amplifier is coupled to an input voltage based upon a line voltage and to a supply voltage derived from the input voltage.
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Abstract
A buffer amplifier comprises a source follower and a feedback amplifier. The feedback amplifier may be configured to control a drain current of the source follower to remain substantially constant independent of a load.
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Citations
37 Claims
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1. Apparatus, comprising:
a buffer amplifier comprising a source follower and a feedback amplifier, the feedback amplifier configured to control a drain current of the source follower to remain substantially constant independent of a load, wherein the buffer amplifier is coupled to an input voltage based upon a line voltage and to a supply voltage derived from the input voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A power monitoring circuit to monitor a line voltage associated with a power source, comprising:
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a buffer amplifier comprising a source follower and a feedback amplifier, the feedback amplifier configured to control a drain current of the source follower to remain substantially constant independent of a load; and a chopper circuit coupled to an input of the buffer amplifier. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. Apparatus comprising:
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means for controlling a drain current of a source follower in a buffer amplifier to remain substantially constant independent of a load, wherein the buffer amplifier is coupled to an input voltage based upon a line voltage and to a supply voltage derived from the input voltage; and means for controlling an output impedance of the buffer amplifier. - View Dependent Claims (34, 35, 36, 37)
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Specification