US 2010/0301927 A1Published application

Booster circuit

AssigneesNEC Electronics Corporation, Toyota Jidosha Kabushiki Kaisha

InventorsYoshihiro NAGAI, Masakazu AMANAI, Masahiko KASHIMURA, Masato TAKI, Norihiro HONDA, Kazushi YAMANAKA

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Abstract

Booster circuit comprising: first transistor that is connected to first node; capacitor that has one end connected to first node, and that is charged with voltage of first node when first transistor is activated; and control signal generating circuit that provides control terminal of first transistor with control signal being in accordance with first clock, wherein when first transistor is de-activated, capacitor boosts voltage of first node to first voltage by voltage being applied to or end of capacitor, voltage applied to or end being at least ½ as great as first supply voltage, and control signal generating circuit sets voltage of control signal when first transistor is de-activated to be first voltage of first node, and sets voltage of control signal when first transistor is activated to be voltage, difference between voltage and first voltage being equal to or smaller than value of first supply voltage.

Claims16

Dependent claims

A booster circuit that boosts a first supply voltage to one of a positive prescribed voltage and a negative prescribed voltage, comprising:

a first transistor that is connected to a first node;
a first capacitive element that has one end connected to the first node, and that is charged with a voltage of the first node when the first transistor is activated;
and
a first control signal generating circuit that provides a control terminal of the first transistor with a first control signal being in accordance with a first clock signal, wherein
when the first transistor is de-activated, the first capacitive element boosts a voltage of the first node to one of a positive first voltage and a negative first voltage by a voltage being applied to other end of the first capacitive element, the voltage applied to the other end being at least ½ as great as the first supply voltage, and
the first control signal generating circuit sets a voltage of the first control signal when the first transistor is de-activated to be the first voltage of the first node, and sets a voltage of the first control signal when the first transistor is activated to be a voltage, difference between the voltage and the first voltage being equal to or smaller than a value of the first supply voltage.

3 more elements

Dependencies are inferred from the claim text.