Power supply circuit
AssigneeSTMicroelectronics (Grenoble 2) SAS
InventorLaurent Simony
Life of this patent
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Abstract
In accordance with an embodiment, a power supply circuit includes: a first transistor device comprising a first gate associated with a first transconductance and a second gate associated with a transconductance greater than the first transconductance; and a second transistor device including a third gate associated with a second transconductance and a fourth gate associated with a transconductance greater than the second transconductance. The second transistor device is configured to supply power to at least one load, the first and the third gates are controlled by a closed regulation loop, and the second and the fourth gates are controlled by a sampled reference voltage.
Claims24
A power supply circuit comprising:
- a first transistor device comprising a first gate associated with a first transconductance and a second gate associated with a transconductance greater than the first transconductance;
- and
- a second transistor device comprising a third gate associated with a second transconductance and a fourth gate associated with a transconductance greater than the second transconductance, wherein the second transistor device is configured to supply power to at least one load, wherein the first and the third gates are controlled by a closed regulation loop, and the second and the fourth gates are controlled by a sampled reference voltage.
A load powering method, comprising:
- controlling a first gate of a first transistor device with a closed regulation loop;
- controlling a second gate of the first transistor device with a sampled reference voltage, the first gate being associated with a first transconductance and the second gate being associated with a transconductance greater than that associated with the first gate;
- controlling a third gate of a second transistor device with the closed regulation loop;
- controlling a fourth gate of the second transistor device with the sampled reference voltage, the third gate being associated with a second transconductance and the fourth gate being associated with a transconductance greater than the second transconductance;
- and
- providing power to at least one load via the second transistor device.
A voltage regulator comprising:
- a first sample and hold circuit having an input coupled to a first reference node configured to provide a first reference voltage;
- a second sample and hold circuit having an input coupled to a second node configured to provide a second reference voltage;
- a replica transistor having a front gate coupled to an output of the first sample and hold circuit;
- a power transistor having a front gate coupled to an output of the first sample and hold circuit, and an output node configured to be coupled to a load;
- and
- a first operational amplifier having a first input coupled to an output node of the replica transistor, a second input coupled to an output of the second sample and hold circuit, and an output coupled to a back gate of the replica transistor, and a back gate of the power transistor.
Dependencies are inferred from the claim text.