DRAM positive wordline voltage compensation device for array device threshold voltage and voltage compensating method thereof
First Claim
1. A DRAM positive wordline voltage compensation device, comprising:
- a comparator having a first input terminal for receiving a positive wordline voltage feedback signal, a second input terminal for receiving a compensating reference of array device threshold voltage and an output terminal for generating a first enable signal;
an oscillator for receiving the first enable signal and selectively generating an oscillating signal when the first enable signal is active; and
a charge pump having a first input terminal for receiving a second enable signal, a second input terminal for receiving the oscillating signal and an output terminal for generating a positive wordline voltage being a sum of a bitline high voltage, an array device threshold voltage and a voltage margin to compensate for a variation in the array device threshold voltage due to temperature and process variations.
1 Assignment
0 Petitions
Accused Products
Abstract
The configurations of a DRAM positive wordline voltage compensation device and a voltage compensating method thereof are provided in the present invention. The proposed device includes a comparator having a first input terminal receiving a positive wordline voltage feedback signal, a second input terminal receiving a compensating reference of array device threshold voltage and an output terminal generating a first enable signal, an oscillator receiving the first enable signal and generating an oscillating signal when the first enable signal is active and a charge pump having a first input terminal receiving a second enable signal, a second input terminal receiving the oscillating signal and an output terminal generating a positive wordline voltage being a sum of a bitline high voltage, an array device threshold voltage and a voltage margin.
-
Citations
17 Claims
-
1. A DRAM positive wordline voltage compensation device, comprising:
-
a comparator having a first input terminal for receiving a positive wordline voltage feedback signal, a second input terminal for receiving a compensating reference of array device threshold voltage and an output terminal for generating a first enable signal; an oscillator for receiving the first enable signal and selectively generating an oscillating signal when the first enable signal is active; and a charge pump having a first input terminal for receiving a second enable signal, a second input terminal for receiving the oscillating signal and an output terminal for generating a positive wordline voltage being a sum of a bitline high voltage, an array device threshold voltage and a voltage margin to compensate for a variation in the array device threshold voltage due to temperature and process variations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
- 11. A voltage compensation device comprising a charge pump having a first output terminal for generating a positive wordline voltage being a sum of a bitline high voltage, an array device threshold voltage and a voltage margin.
- 13. A voltage compensation device comprising a charge pump having a first output terminal for selectively raising a positive wordline voltage when the positive wordline voltage is less than a sum of a bitline high voltage, an array device threshold voltage and a voltage margin.
-
15. A voltage compensating method comprising a step of providing a charge pump that selectively raising a positive wordline voltage when the positive wordline voltage is less than a sum of a bitline high voltage, an array device threshold voltage and a voltage margin.
- 16. A voltage compensating method comprising a step of providing a charge pump that generating a positive wordline voltage being a sum of a bitline high voltage, an array device threshold voltage and a voltage margin.
Specification