Voltage converter system and method having a stable output voltage
AssigneeMicron Technology, Inc.
InventorsChristophe J. Chevallier, Dumitru Cioaca
Life of this patent
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Abstract
An apparatus and method for compensating for a decreasing internal voltage that is generated from a higher external voltage. In response to the internal voltage decreasing in excess of a voltage margin, the amount by which the higher external voltage is reduced in generating the internal voltage is adjusted to raise the internal voltage.
Claims26
A compensation circuit for a voltage converter that converts a first voltage applied to an input voltage node to an output voltage provided at an output voltage node, the output voltage having a lower voltage than the first voltage based on the voltage of a control signal applied to a control terminal of a voltage controlled impedance device coupled between the input and output voltage nodes, the compensation circuit comprising:
- a switch coupled between the input voltage node and the control terminal of the voltage controlled impedance device and having a control terminal, the switch coupling the input voltage node to the control terminal in response to the output voltage decreasing in excess of a voltage difference;
- and
- a voltage divider having load elements coupled between the input node and ground and further having a bias node coupled to the control terminal of the switch and the output node, the voltage divider maintaining a voltage at the control terminal of the switch to isolate the input node and the control terminal of the voltage controlled impedance device until the voltage of the output voltage decreases in excess of the voltage difference.
A compensation circuit for a voltage converter that converts a first voltage applied to an input voltage node to an output voltage provided at an output voltage node, the output voltage having a lower voltage than the first voltage based on the voltage of a control signal applied to a control terminal of a voltage controlled impedance device coupled between the input and output voltage nodes, the compensation circuit comprising:
- a switch coupled between the input voltage node and the control terminal of the voltage controlled impedance device and having a control terminal, the switch coupling the input voltage node to the control terminal in response to the output voltage decreasing in excess of a voltage difference;
- a voltage divider having load elements coupled between the input node and ground and further having a bias node coupled to the control terminal of the switch and the output node;
- and
- a capacitor having a first terminal coupled to the output node and a second terminal coupled to the bias node.
A compensation circuit for a voltage converter that converts a first voltage applied to an input voltage node to an output voltage provided at an output voltage node, the output voltage having a voltage based on the voltage of a control signal applied to a control terminal of a first transistor coupled between the input and output voltage nodes, the compensation circuit comprising:
- a voltage divider coupled between the input node and ground, the voltage divider further having a bias node coupled to the output voltage node;
- and
- a second transistor coupled between the input voltage node and the control terminal of the first transistor, the second transistor having a control terminal coupled to the bias node of the voltage divider, the voltage divider maintaining a voltage at the control terminal of the second transistor to isolate the input node and the control terminal of the first transistor until the difference between the output voltage and the first voltage exceed a voltage difference.
A compensation circuit for a voltage converter that converts a first voltage applied to an input voltage node to an output voltage provided at an output voltage node, the output voltage having a voltage based on the voltage of a control signal applied to a control terminal of a voltage controlled impedance device coupled between the input and output voltage nodes, the compensation circuit comprising:
- an inverter coupled between the input node and ground, the inverter having an input node coupled to the output voltage node and further having an output node;
- and
- a capacitor having a first node coupled to the output node of the inverter and further having a second node coupled to the control terminal of the voltage controlled impedance device.
A method for compensating for an internal voltage that is decreasing, the internal voltage generated from an external voltage, the method comprising:
- in response to the internal voltage decreasing relative to the external voltage in excess of a voltage difference, applying the external voltage to adjust an amount by which the external voltage is transferred in generating the internal voltage.
Dependencies are inferred from the claim text.