Dual loop voltage regulator based on inverter amplifier and voltage regulating method thereof
First Claim
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1. A voltage regulator comprising:
- a pass element having a power input connected to a voltage source, a power output connected to a load, and a control input;
a buffer having an input and having an output connected to the control input of the pass element;
an error amplifier forming a first feedback loop together with the pass element and the buffer and having a positive input connected to a sampled voltage of the power output of the pass element, a negative input connected to a reference voltage, and an output connected to the input of the buffer; and
a fast push-pull driver connected between the power output and the control input of the pass element in an inverter type amplification structure and configured to reduce a negative peak and a positive peak of the power output due to a variation in the load at a speed faster than a voltage regulating speed of the first feedback loop.
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Abstract
A voltage regulator includes a pass element, a buffer, and an error amplifier. The voltage regulator further includes a fast push-pull driver that has an inverter type amplification structure, is connected between a power output and a control input of the pass element, and reduces positive and negative peaks of the power output at a speed faster than a speed of a main feedback loop.
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Citations
20 Claims
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1. A voltage regulator comprising:
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a pass element having a power input connected to a voltage source, a power output connected to a load, and a control input; a buffer having an input and having an output connected to the control input of the pass element; an error amplifier forming a first feedback loop together with the pass element and the buffer and having a positive input connected to a sampled voltage of the power output of the pass element, a negative input connected to a reference voltage, and an output connected to the input of the buffer; and a fast push-pull driver connected between the power output and the control input of the pass element in an inverter type amplification structure and configured to reduce a negative peak and a positive peak of the power output due to a variation in the load at a speed faster than a voltage regulating speed of the first feedback loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A voltage regulator comprising:
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a pass element having a power input connected to a voltage source, a power output connected to a load, and a control input; a buffer having an input and having an output connected to the control input of the pass element; an error amplifier forming a first feedback loop together with the pass element and the buffer and having a positive input connected to a divided voltage of the power output of the pass element, a negative input connected to a reference voltage, and an output connected to an input of the buffer; and a fast push-pull driver connected between the power output and the control input of the pass element in an inverter type amplification structure and configured to regulate the power output at a speed faster than a regulating speed of the first feedback loop while alternating current (AC) coupling the power output when an undershoot and an overshoot of the power output occur due to a variation in the load. - View Dependent Claims (12, 13, 14, 15)
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16. A low drop-out voltage regulator comprising:
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a pass element configured to pass a power input to a power output connected to a load in response to a voltage on a control input; a voltage divider configured to divide the power output according to a designated resistance ratio to generate a division output; a buffer having an input and having an output connected to the control input of the pass element; an error amplifier forming a first feedback loop together with the pass element and the buffer and configured to compare and amplify a voltage of a positive input connected to the division output of the voltage divider and a voltage of a negative input connected to an input reference voltage, an output of the error amplifier being provided as an input of the buffer; and a fast push-pull driver having an inverter type amplification structure and configured to regulate the power output to a target voltage at a speed faster than a voltage regulating speed of the first feedback loop, when a negative peak or a positive peak deviating from the target voltage of the power output occurs due to a variation in the load. - View Dependent Claims (17, 18, 19, 20)
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Specification