System including an offset voltage adjusted to compensate for variations in a transistor
First Claim
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1. A system, comprising:
- a first transistor having a first control input and configured to regulate an output voltage;
a first capacitor directly connected at one end to the first control input and directly connected at another end to a circuit reference; and
a circuit configured to provide a first voltage to the first control input, wherein the circuit comprises;
a first compensation circuit configured to provide an offset voltage that is part of the first voltage and referenced to the output voltage, wherein the first compensation circuit includes a compensation transistor that is similar to the first transistor such that variations in temperature and process changes affect both the compensation transistor and the first transistor and the compensation transistor is configured to vary the offset voltage to compensate for the variations in temperature and the process changes in the first transistor.
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Abstract
A system including a first transistor, a first capacitor and a circuit. The first transistor has a first control input and is configured to regulate an output voltage. The first capacitor is coupled at one end to the first control input and at another end to a circuit reference. The circuit is configured to provide a first voltage to the first control input, where the first voltage includes an offset voltage that is referenced to the output voltage and adjusted to compensate for variations in the first transistor.
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Citations
22 Claims
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1. A system, comprising:
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a first transistor having a first control input and configured to regulate an output voltage; a first capacitor directly connected at one end to the first control input and directly connected at another end to a circuit reference; and a circuit configured to provide a first voltage to the first control input, wherein the circuit comprises; a first compensation circuit configured to provide an offset voltage that is part of the first voltage and referenced to the output voltage, wherein the first compensation circuit includes a compensation transistor that is similar to the first transistor such that variations in temperature and process changes affect both the compensation transistor and the first transistor and the compensation transistor is configured to vary the offset voltage to compensate for the variations in temperature and the process changes in the first transistor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system, comprising:
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a first transistor having a drain/source path and configured to regulate an output voltage at an output; a capacitor directly connected to one side of the drain/source path of the first transistor and configured to provide current to the output through the first transistor; and a device directly connected to the one side of the drain/source path of the first transistor and configured to dampen current from a power supply to provide dampened current and charge the capacitor with the dampened current, wherein the device is one of a resistor, a transconductance amplifier, and a current source including a current mirror pair of transistors. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for providing an output voltage comprising:
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receiving a first voltage at a first control input of a first transistor; regulating the output voltage via the first transistor; compensating frequency responses via a capacitor directly connected at one end to the first control input and directly connected at another end to a circuit reference; providing the first voltage to the first control input via a circuit that includes a compensation circuit; providing an offset voltage that is part of the first voltage and referenced to the output voltage via the compensation circuit that include a compensation transistor that is similar to the first transistor such that variations in temperature and process changes affect both the compensation transistor and the first transistor; and varying the offset voltage via the compensation transistor to compensate for the variations in temperature and the process changes in the first transistor. - View Dependent Claims (15, 16, 17)
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18. A method for providing an output voltage at an output comprising:
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regulating the output voltage via a first transistor having a drain/source path; dampening current from a power supply via a device, which is one of a resistor, a transconductance amplifier, and a current source including a current mirror pair of transistors, directly connected to one side of the drain/source path of the first transistor to provide dampened current; charging a capacitor directly connected to the one side of the drain/source path of the first transistor with the dampened current; and discharging the capacitor directly connected to the one side of the drain/source path of the first transistor through the first transistor to provide a current to the output. - View Dependent Claims (19, 20, 21, 22)
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Specification