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US 2020/0067467 A1Published application
Voltage Buffer for Input Voltages Above a Supply Voltage or Below Ground Voltage
AssigneeAllegro MicroSystems, LLC
InventorsSoo-Chang Choe, Craig S. Petrie
Life of this patent
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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.
Claims39
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.
(canceled)
A power monitoring circuit to monitor a line voltage associated with a power source, 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.
Apparatus comprising:
- means for controlling a drain current of a source follower in a buffer amplifier to remain substantially constant independent of a load;
- and
- means for controlling an output impedance of the buffer amplifier.
Dependencies are inferred from the claim text.