Back to results
US 12,699,410 B2Granted
Source/sink LDO with reduced dead band
AssigneeRenesas Electronics America Inc.
InventorRichard Todd Owen
Life of this patent
Estimating the term…
Abstract
A source/sink LDO is provided with a pre-amplifier that pre-amplifies an error voltage equaling a difference between an output voltage and a reference voltage. The resulting pre-amplification reduces the dead band for the source/sink LDO by the gain of the pre-amplifier.
Claims20
A source/sink LDO, comprising:
- an output node for an output voltage;
- a first transistor coupled between the output node and a power supply node for a power supply voltage;
- a second transistor coupled between the output node and ground;
- a pre-amplifier configured to amplify an error signal to form a pre-amplified error signal, wherein the error signal equals a difference between the output voltage and a reference voltage;
- and
- an error amplifier configured to drive a gate of the first transistor and to drive a gate of the second transistor responsive to the pre-amplified error signal and an offset voltage.
3 more elements
A method of operation of a source/sink LDO comprising:
- pre-amplifying a difference between an output voltage and a reference voltage to provide a differential pre-amplified voltage;
- driving a gate of a first transistor coupled between an output node for the output voltage and a power supply node for a power supply voltage responsive to a negative of the differential pre-amplified voltage minus an offset voltage;
- and
- driving a gate of a second transistor coupled between the output node and ground responsive to the differential pre-amplified voltage minus the offset voltage.
1 more element
A source/sink LDO, comprising:
- a pre-amplifier configured to pre-amplify an error voltage into a pre-amplified error voltage having a positive component and a negative component;
- an offset voltage circuit configured to subtract an offset voltage from the negative component to form a first voltage and to add the offset voltage to the negative component to form a second voltage;
- a first differential amplifier configured to amplify a difference between the first voltage and the positive component;
- and
- a second differential amplifier configured to amplify a difference between the positive component and the second voltage.
2 more elements
Dependencies are inferred from the claim text.