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US 12,181,903 B2Granted
Power supply rejection enhancer
AssigneeQUALCOMM Incorporated
InventorsKuan Chuang Koay, Hua Guan, Jize Jiang
Life of this patent
Estimating the term…
Abstract
In certain aspects, a system includes an amplifying circuit having an input and an output, a high-pass filter coupled between a gate of a pass transistor of a low dropout (LDO) regulator and the input of the amplifying circuit, and a metal-oxide-semiconductor (MOS) capacitor coupled between the output of the amplifying circuit and the gate of the pass transistor.
Claims21
A system, comprising:
- an amplifying circuit having an input and an output;
- a high-pass filter coupled between a gate of a pass transistor of a low dropout (LDO) regulator and the input of the amplifying circuit, wherein the high-pass filter comprises
- a capacitor coupled between the gate of the pass transistor and the input of the amplifying circuit, and
- a resistor coupled to the input of the amplifying circuit, wherein the resistor is coupled between the input of the amplifying circuit and a drain of the pass transistor;
- and
- a metal-oxide-semiconductor (MOS) capacitor coupled between the output of the amplifying circuit and the gate of the pass transistor.
3 more elements
A system, comprising:
- an amplifying circuit having an input and an output, wherein the input of the amplifying circuit is coupled to a gate of a pass transistor of a low dropout (LDO) regulator, a source of the pass transistor is coupled to a supply rail, and a drain of the pass transistor is coupled to an output of the LDO regulator, wherein the amplifying circuit comprises
- an amplifier having a first input, a second input, and an output, wherein the output of the amplifier is coupled to the output of the amplifying circuit and the first input of the amplifier is coupled to the input of the amplifying circuit,
- a first resistor coupled between the second input of the amplifier and the output of the LDO regulator, and
- a second resistor coupled between the output of the amplifier and the second input of the amplifier;
- a metal-oxide-semiconductor (MOS) capacitor coupled between the output of the amplifying circuit and the gate of the pass transistor;
- and
- a current-sensing transistor having a gate coupled to the gate of the pass transistor, a source coupled to the supply rail, and a drain coupled to the amplifying circuit.
4 more elements
Dependencies are inferred from the claim text.