Method for Improving Power-Supply Rejection
First Claim
1. An electronic circuit comprising:
- an output node;
a first input transistor having;
a first channel terminal configured to draw a first portion of a first current generated from a supply voltage; and
a control terminal configured to receive a reference input;
a second input transistor having;
a first channel terminal configured to draw a second portion of the first current; and
a control terminal configured in a feedback loop with the output node;
a first output transistor having;
a first channel terminal coupled to the output node and configured to draw a second current generated from the supply voltage;
a second channel terminal coupled to a second channel terminal of the first input transistor; and
a control terminal configured to receive a biasing signal;
a second output transistor having;
a first channel terminal configured to draw a third current generated from the supply voltage;
a second channel terminal coupled to a second channel terminal of the second input transistor; and
a control terminal configured to receive the biasing signal;
a third output transistor having;
a first channel terminal coupled to the second channel terminal of the first output transistor;
a second channel terminal coupled to a reference voltage; and
a control terminal coupled to a control node;
a fourth output transistor having;
a first channel terminal coupled to the second channel terminal of the second output transistor;
a second channel terminal coupled to the reference voltage; and
a control terminal coupled to the control node; and
a capacitor coupled between the supply voltage and the control node to prevent the first and second transistors from turning off during a rising edge of the supply voltage, to prevent an output voltage generated at the output node from rising during the rising edge of the supply voltage.
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Abstract
An electronic circuit may comprise an input stage powered by a supply voltage and configured to receive a reference signal. The circuit may further comprise an output stage powered by the supply voltage and coupled to the input stage, and configured to generate an error signal based on: the reference signal, and a feedback signal based on an output signal. The circuit may also include a pass transistor powered by the supply voltage and configured to generate the output signal based on the error signal. A capacitor coupled between the supply voltage and the output stage may increase the current flowing in the output stage, resulting in the output stage conducting current even during a rising edge of the supply voltage, preventing the output signal from reaching the level of the supply voltage during the rising edge of the supply voltage.
100 Citations
20 Claims
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1. An electronic circuit comprising:
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an output node; a first input transistor having;
a first channel terminal configured to draw a first portion of a first current generated from a supply voltage; and
a control terminal configured to receive a reference input;a second input transistor having;
a first channel terminal configured to draw a second portion of the first current; and
a control terminal configured in a feedback loop with the output node;a first output transistor having;
a first channel terminal coupled to the output node and configured to draw a second current generated from the supply voltage;
a second channel terminal coupled to a second channel terminal of the first input transistor; and
a control terminal configured to receive a biasing signal;a second output transistor having;
a first channel terminal configured to draw a third current generated from the supply voltage;
a second channel terminal coupled to a second channel terminal of the second input transistor; and
a control terminal configured to receive the biasing signal;a third output transistor having;
a first channel terminal coupled to the second channel terminal of the first output transistor;
a second channel terminal coupled to a reference voltage; and
a control terminal coupled to a control node;a fourth output transistor having;
a first channel terminal coupled to the second channel terminal of the second output transistor;
a second channel terminal coupled to the reference voltage; and
a control terminal coupled to the control node; anda capacitor coupled between the supply voltage and the control node to prevent the first and second transistors from turning off during a rising edge of the supply voltage, to prevent an output voltage generated at the output node from rising during the rising edge of the supply voltage. - View Dependent Claims (4, 5, 6, 7, 8)
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2. The electronic circuit of claim 2, further comprising a pass transistor having a control terminal coupled to the first channel terminal of the first output transistor;
- and a channel coupled between the supply voltage and the output node.
- View Dependent Claims (3)
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9. A voltage regulator comprising:
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a regulator output configured to provide a regulated voltage; an error amplifier powered by a supply voltage, and having a first input configured to receive a reference signal; a pass transistor having a control terminal coupled to an output of the error amplifier; and
a channel coupled between the supply voltage and the regulator output;wherein the regulator output is coupled to a second input of the error amplifier to form a feedback control loop; wherein the error amplifier comprises an output stage configured to provide an output signal at the output of the error amplifier; and wherein the error amplifier is configured to control the output stage of the error amplifier to conduct current during a rising edge of the supply voltage to prevent the regulated output voltage from rising during the rising edge of the supply voltage. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of operating an electronic circuit, the method comprising:
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providing a supply voltage to the electronic circuit; providing a reference signal to the electronic circuit; generating an output signal based on the supply voltage, the reference signal, and an error signal; generating a feedback signal based on the output signal; an output stage of the electronic circuit generating the error signal based on the supply voltage, the reference signal, and the feedback signal; and controlling the output stage from within the electronic circuit to have the output stage continue to conduct current during a rising edge of the supply voltage to prevent the output signal from rising to the level of the supply voltage during the rising edge of the supply voltage. - View Dependent Claims (16, 17)
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18. An electronic circuit comprising:
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an input stage powered by a supply voltage and configured to receive a reference signal; an output stage powered by the supply voltage and coupled to the input stage, and configured to generate an error signal based on;
the reference signal, and a feedback signal based on an output signal;a pass transistor powered by the supply voltage and configured to generate the output signal based on the error signal; and a capacitor coupled between the supply voltage and the output stage to increase current flowing in the output stage to have the output stage conduct current even during a rising edge of the supply voltage to prevent the output signal from reaching the level of the supply voltage during the rising edge of the supply voltage. - View Dependent Claims (19, 20)
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Specification