Negative voltage generator
AssigneeEtron Technology, Inc.
InventorJen Shou Hsu
Life of this patent
Estimating the term…
Abstract
A negative voltage generator includes a current mirror unit, a control unit, a resistor, and a switching unit. The current mirror unit receives a first positive voltage from a first positive voltage source and a second positive voltage from a second positive voltage source and determines how to generate a first output current and a second output current according to the difference of a received positive reference voltage and the second positive voltage. The control unit generates a control signal whose value depends on the voltage variation of a negative voltage generated by a negative voltage source, and the on/off state of the switching unit is determined according to the control signal to keep the current passing through the switching unit constant and to generate a first output negative voltage having a constant level.
Claims24
A negative voltage generator, comprising:
- a current mirror unit for receiving a first positive voltage from a first positive voltage source and a second positive voltage from a second positive voltage source and determining how to generate a first output current and a second output current according to a received positive reference voltage and the second positive voltage, wherein the values of the first output current and the second output current are proportional;
- a control unit for receiving the second output current and generating a control signal whose value depends on the voltage variation of a negative voltage generated by a negative voltage source;
- a first resistor connected between the second positive voltage source and a first output node;
- and
- a switching unit connected between the first output node and the negative voltage source, the on/off state of the switching unit being determined according to the control signal to keep the current passing through the switching unit constant and to generate a first output negative voltage having a constant level through the first output node.
A negative voltage generator, comprising:
- a current mirror unit connected to a first voltage source and to a second voltage source, the current mirror unit generating a first output current and a second output current according to a predetermined positive reference voltage and the voltage level provided from the second voltage source, wherein the values of the first output current and the second output current are proportional;
- a control unit for receiving the second output current and generating a control signal whose value depends on the voltage variation of a predetermined negative reference voltage;
- and
- a switching unit connected between a first output node and the control unit, the on/off state of the switching unit being determined according to the control signal to keep the current passing through the switching unit substantially constant and to generate a first output negative voltage having a substantially constant level at the first output node.
A negative voltage generator, comprising:
- a resistance device disposed between a voltage source and a predetermined negative reference voltage;
- a constant current source generating a constant current flowing through the resistance device, wherein a first output negative voltage is generated at one end of the resistance device and the level of the first output negative voltage is independent of the variation of the predetermined negative reference voltage;
- a first negative voltage down converter receiving the first output negative voltage and generating a second output negative voltage at a second output node, wherein the magnitude of the second output negative voltage is higher than that of the first output negative voltage;
- and
- a kick unit connected to the voltage source to drive the first negative voltage down converter according to a trigger signal so as to adjust the level of the second output negative voltage.
Dependencies are inferred from the claim text.