Wide-bandwidth linear regulator
First Claim
1. A linear regulator comprising:
- a first feedback loop characterized by a first bandwidth and a first gain, the first feedback loop including a first amplifier characterized by an output impedance which is significantly reduced in order to maximize the bandwidth of the first feedback loop when driving the capacitance of a control input of a series pass element; and
a second feedback loop characterized by a second bandwidth and a second gain, the second feedback loop including a second amplifier that controls the current in the first amplifier in the first feedback loop, wherein the first amplifier and the second amplifier receive a same reference voltage level, and wherein the second amplifier of the second feedback loop controlling the current in the first amplifier in the first feedback loop acts to correct gain error resulting from the first gain in the first feedback loop,wherein, the first amplifier is a low gain, high bandwidth amplifier and the second amplifier is a high gain, low bandwidth amplifier.
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Abstract
A linear regulator and a method of regulating a supply voltage are provided. Embodiments include a linear regulator with a first feedback loop and a second feedback loop. The first feedback loop is characterized by a first bandwidth and a first gain. The first feedback loop includes a first amplifier characterized by an output impedance which is significantly reduced in order to maximize the bandwidth of the first feedback loop when driving the capacitance of a control input of a series pass element. The second feedback loop is characterized by a second bandwidth and a second gain. The second feedback loop includes a second amplifier that controls the current in the first amplifier in the first feedback loop.
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Citations
12 Claims
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1. A linear regulator comprising:
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a first feedback loop characterized by a first bandwidth and a first gain, the first feedback loop including a first amplifier characterized by an output impedance which is significantly reduced in order to maximize the bandwidth of the first feedback loop when driving the capacitance of a control input of a series pass element; and a second feedback loop characterized by a second bandwidth and a second gain, the second feedback loop including a second amplifier that controls the current in the first amplifier in the first feedback loop, wherein the first amplifier and the second amplifier receive a same reference voltage level, and wherein the second amplifier of the second feedback loop controlling the current in the first amplifier in the first feedback loop acts to correct gain error resulting from the first gain in the first feedback loop, wherein, the first amplifier is a low gain, high bandwidth amplifier and the second amplifier is a high gain, low bandwidth amplifier. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of regulating a supply voltage, the method comprising:
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regulating, by a first feedback loop of a linear regulator, the output voltage of the linear regulator, the first feedback loop including a first amplifier characterized by an output impedance which is significantly reduced in order to maximize the bandwidth of the first feedback loop when driving the capacitance of a control input of a series pass element; and regulating, by a second feedback loop of the linear regulator, the output voltage of the linear regulator, the second feedback loop characterized by a second bandwidth and a second gain, the second feedback loop including a second amplifier that controls the current in the first amplifier in the first feedback loop, wherein the first amplifier and the second amplifier receive a same reference voltage level, and wherein the second amplifier of the second feedback loop controlling the current in the first amplifier in the first feedback loop acts to correct gain error resulting from the first gain in the first feedback loop, wherein, the first amplifier is a low gain, high bandwidth amplifier and the second amplifier is a high gain, low bandwidth amplifier. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification