Frequency compensation for a low drop-out regulator
First Claim
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1. A regulator for providing a regulated output signal at an output terminal, the regulator comprising:
- an input stage for receiving an input voltage signal and a reference voltage signal and providing an input stage output signal, the input stage output signal being based on a difference between the input voltage signal and the reference voltage signal, the input voltage signal being derived from the regulated output signal at the output terminal;
an inverting stage coupled to the input stage for inverting the input stage output signal and providing an inverter output signal;
an output stage, responsive to the inverter output signal, for providing the regulated output signal; and
a capacitor coupled between the input stage output and the regulated output signal.
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Abstract
A low drop-out voltage regulator is compensated by providing a compensation capacitor across an output terminal of the regulator and an output lead of an input stage which compares a reference voltage and a voltage derived from a regulated output signal at the output terminal. The output from the input stage is inverted without gain before being provided to an output stage. This inversion allows Miller compensation with the compensation capacitor.
92 Citations
25 Claims
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1. A regulator for providing a regulated output signal at an output terminal, the regulator comprising:
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an input stage for receiving an input voltage signal and a reference voltage signal and providing an input stage output signal, the input stage output signal being based on a difference between the input voltage signal and the reference voltage signal, the input voltage signal being derived from the regulated output signal at the output terminal; an inverting stage coupled to the input stage for inverting the input stage output signal and providing an inverter output signal; an output stage, responsive to the inverter output signal, for providing the regulated output signal; and a capacitor coupled between the input stage output and the regulated output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A low drop-out voltage regulator for providing a regulated output signal at an output, the regulator comprising;
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means for deriving an input signal from the regulated output voltage; means for comparing the input voltage and a reference voltage and for providing an error signal based on a difference between the input voltage and the reference voltage at an input stage output; means for inverting the error signal; means for receiving the inverted signal and providing the regulated output signal; and a capacitor coupled to the input stage output and to the regulated output signal for compensating the regulator. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A regulator for providing a regulated output signal at an output terminal, the regulator comprising:
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a transconductance stage that receives an input voltage signal and a reference voltage signal and provides an amplified error signal based on a difference between the input voltage signal and the reference voltage signal at a transconductance stage output lead, the input voltage signal being derived from the regulated output signal at the output terminal; an inverting stage that receives the amplified error signal from the transconductance stage and inverts the amplified error signal to provide an inverted amplified error signal; a first transistor having a control lead that receives the inverted amplified error signal and providing a drive signal; a second transistor having a control lead that receives the drive signal and coupled to the output terminal to provide the regulated output signal; and a capacitor coupled between the output terminal and the transconductance stage output lead. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification