PMOS-output LDO with full spectrum PSR
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United States of America Patent
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Oct 25, 2022
Grant Date -
Jul 22, 2021
app pub date -
Apr 6, 2021
filing date -
Oct 16, 2018
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Abstract
A PMOS-output LDO with full spectrum PSR is disclosed. In one implementation, a LDO includes a pass transistor (MO) having a source coupled to an input voltage (Vin); a noise cancelling transistor (MD) having a source coupled to the Vin, a gate coupled to a drain and a gate of the pass transistor; a source follower transistor (MSF) having a source coupled to a drain of the pass transistor, a drain coupled to the drain and gate of the noise cancelling transistor; a current sink coupled between the drain of the source follower transistor and ground; and an error amplifier having an output to drive the gate of the source follower transistor.
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