Voltage multiplier circuit and nonvolatile semiconductor memory device having voltage multiplier
AssigneeKabushiki Kaisha Toshiba
InventorsToru Tanzawa, Tomoharu Tanaka, Hiroshi Nakamura, Yoshiyuki Tanaka
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Abstract
A voltage multiplier circuit for raising an input voltage to a predetermined voltage is characterized in that a plurality of multiplier cells for raising an input voltage to be outputted, and a connection switching circuit for switching a connection state of these multiplier cells are provided, and the connection switching circuit connects multiplier cell groups formed by connecting one or a plurality of the multiplier cells, in parallel to an output, and varies the number of the multiplier cells of the multiplier cell groups and that of the multiplier cell groups.
Claims47
A voltage multiplier circuit comprising:
- a plurality of multiplier cell groups, each multiplier cell group comprising a plurality of multiplier cells connected in series, each of said multiplier cells raising an input voltage to output a multiplied voltage, said multiplier cell groups connected in parallel to an output;
- and
- a connection switching circuit for switching a connection state of said multiplier cell groups and said multiplier cells, and said switching circuit chancing the number of multiplier cell groups of said voltage multiplier circuit and the number of multiplier cells of the multiplier cell groups.
A nonvolatile semiconductor memory device having a voltage multiplier circuit, said voltage multiplier circuit comprising:
- a plurality of multiplier cells for raising an input voltage to output a multiplied voltage, said plurality of multiplier cells divided into multiplier cell groups, said multiplier cell groups connected in parallel or series to an output and having one or a plurality of the multiplier cells connected in series;
- and
- a connection switching circuit for switching a connection state of said multiplier cells, and said switching circuit changing the number of multiplier cells of the multiplier cell groups and the number of multiplier cell groups.
A voltage multiplier circuit comprising:
- a plurality of multiplier cells for raising an input voltage to output a multiplied voltage, each of said plurality of multiplier cells comprising a capacitor for multiplication and a charge transfer gate, said plurality of multiplier cells connected in series to an output, and driven by a plurality of pulse voltages whose phases are set to transfer electrical charges in a direction of said output;
- a plurality of parallel connecting means for directly outputting electrical charges of each of said multiplier cell to the output;
- and
- a number of stages and capacity varying means for varying the number of said multiplier cells in which electrical charges are outputted in series and the number of said multiplier cells in which electrical charges are directly outputted to the output.
A voltage multiplier circuit comprising:
- at least first, second and third multiplier cell groups, each of said multiplier cell groups comprising a plurality of multiplier cells for raising an input voltage to a multiplied voltage;
- said first multiplier cell group comprising a plurality of multiplier cells connected in parallel to an output;
- said second multiplier cell group comprising plural series-connected multiplier cells, said plural series-connected multiplier cells connected in parallel to an output;
- said third multiplier cell group comprising a plurality of multiplier cells being connected in series to an output;
- and
- a connection switching circuit for switching a connection state of said plurality of multiplier cell groups, thereby selecting one of said first, second and third cell groups for raising of the input voltage.
A voltage multiplier circuit comprising:
- a plurality of multiplier cells, each multiplier cell raising an input voltage to output a multiplied voltage, a plurality of said multiplier cells connected in series to an output terminal;
- and
- a connection switching circuit for changing a number of said plurality of multiplier cells connected in series to said output terminal.
A voltage multiplier circuit comprising:
- a plurality of multiplier cells, each multiplier cell raising an input voltage to output a multiplied voltage;
- and
- a connection switching circuit for changing a connection state of said plurality of multiplier cells.
A voltage multiplier circuit comprising:
- a plurality of multiplier cells, each multiplier cell raising an input voltage to output a multiplied voltage;
- and
- a connection switching circuit for switching a connection state of said plurality of multiplier cells,
- wherein said connection switching circuit comprises switching means having a control gate, and means for applying a switching signal to said control gate for turning on/off said switching means,
- wherein the means for applying a switching signal comprises a boosting circuit, an input terminal of said boosting circuit being connected to an output of one said multiplier cell, and said boosting circuit including a logic circuit controlled by said switching signal.
Dependencies are inferred from the claim text.