FLASH MEMORY WITH READ TRACKING CLOCK AND METHOD THEREOF
First Claim
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1. A flash memory having a read tracking clock, comprising:
- a current detecting circuit detecting a pre-charge time of the flash memory and comprising;
a copy circuit, comprising;
a reference current generator generating a reference current, and having a first terminal and a second terminal connected to a ground;
a first switch having a first terminal receiving a power supply voltage, a second terminal coupled to the first terminal of the reference current generator and generating a first charge current, and a control terminal receiving a first bit line clamping signal; and
a second switch having a first terminal receiving the power supply voltage, a second terminal generating a second charge current being a copy of the first charge current, and a control terminal receiving the first bit line clamping signal;
a mirror circuit reflecting the second charge current to the comparing circuit; and
a comparing circuit comparing the second charge current with a second reference current, and sending out a signal indicating the pre-charge time being accomplished when the second reference current is larger than the second charge current.
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Abstract
The configurations of a flash memory having a read tracking clock and method thereof are provided. The proposed flash memory includes a first and a second storage capacitors, a first current source providing a first current flowing through the first storage capacitor, a second current source providing a second current flowing through the second storage capacitor, and a comparator electrically connected to the first and the second current sources, and sending out a signal indicating a developing time being accomplished when the second current is larger than the first current.
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Citations
15 Claims
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1. A flash memory having a read tracking clock, comprising:
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a current detecting circuit detecting a pre-charge time of the flash memory and comprising; a copy circuit, comprising; a reference current generator generating a reference current, and having a first terminal and a second terminal connected to a ground; a first switch having a first terminal receiving a power supply voltage, a second terminal coupled to the first terminal of the reference current generator and generating a first charge current, and a control terminal receiving a first bit line clamping signal; and a second switch having a first terminal receiving the power supply voltage, a second terminal generating a second charge current being a copy of the first charge current, and a control terminal receiving the first bit line clamping signal; a mirror circuit reflecting the second charge current to the comparing circuit; and a comparing circuit comparing the second charge current with a second reference current, and sending out a signal indicating the pre-charge time being accomplished when the second reference current is larger than the second charge current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A flash memory having a read tracking clock, comprising:
a first tracking circuit detecting a developing time of the flash memory, and comprising; a first storage capacitor; a first storage cell receiving a first bias and coupled to the first storage capacitor; a second storage capacitor; a second storage cell receiving a second bias and coupled to the second storage capacitor, wherein the second bias is the first bias subtracts a predetermined value; a first current source generating a first current flowing through the first storage capacitor when the first storage cell is conductive; a second current source generating a second current flowing through the second storage capacitor when the second storage cell is conductive; and a first comparator having an inverting terminal electrically connected to the first current source, a non-inverting terminal electrically connected to the second current source and an output terminal sending out a signal indicating the developing time being accomplished when the second current is larger than the first current. - View Dependent Claims (9, 10, 11, 12)
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13. A method for a flash memory having a read tracking clock and a charge sharing node, comprising steps of:
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detecting whether a voltage value of the charge sharing node is decreased; and if it is, sending out a signal indicating a charge sharing time being accomplished. - View Dependent Claims (14, 15)
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Specification