Amplifiers with enhanced power supply rejection ratio at the output stage
First Claim
1. An amplifier circuit receiving a first supply voltage and a second supply voltage, comprising:
- a detection circuit, detecting disturbances occurring in the first supply voltage and providing detection results to a control amplifier circuit;
the control amplifier circuit, coupled to the detection circuit and controlling a first voltage provided to a first control node and a second voltage provided to a second control node in response to the detected results; and
an output stage circuit, comprising;
a first output power transistor, coupled to the control amplifier circuit at the first control node; and
a second output power transistor, coupled to the control amplifier circuit at the second control node,wherein the first voltage and the second voltage are controlled differently when a disturbance is detected to have occurred.
1 Assignment
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Accused Products
Abstract
An amplifier circuit is disclosed. The amplifier circuit includes a detection circuit, a control amplifier circuit and an output stage. The detection circuit detects disturbances occurring in a first supply voltage and provides detection results. The control amplifier circuit controls a first voltage provided to a first control node and a second voltage provided to a second control node in response to the detection results. The output stage circuit includes a first output power transistor coupled to the control amplifier circuit at the first control node and a second output power transistor coupled to the control amplifier circuit at the second control node. The first voltage and the second voltage are controlled differently when a disturbance is detected to have occurred.
4 Citations
18 Claims
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1. An amplifier circuit receiving a first supply voltage and a second supply voltage, comprising:
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a detection circuit, detecting disturbances occurring in the first supply voltage and providing detection results to a control amplifier circuit; the control amplifier circuit, coupled to the detection circuit and controlling a first voltage provided to a first control node and a second voltage provided to a second control node in response to the detected results; and an output stage circuit, comprising; a first output power transistor, coupled to the control amplifier circuit at the first control node; and a second output power transistor, coupled to the control amplifier circuit at the second control node, wherein the first voltage and the second voltage are controlled differently when a disturbance is detected to have occurred. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An amplifier circuit, comprising:
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an output stage circuit, providing an output signal of the amplifier according to a first voltage and a second voltage; a control amplifier circuit, providing the first voltage and the second voltage to the output stage circuit; a detection circuit, detecting disturbances occurring in a first supply voltage and providing detection results to the control amplifier circuit; wherein the control amplifier circuit only adjusts the first voltage in response to the detected disturbance occurring in the first supply voltage, and wherein when a disturbance is detected to have occurred in the first supply voltage, the amount of change in the first voltage correlates with an amount of change in the first supply voltage. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification