Voltage supply circuit and semiconductor memory
First Claim
1. A voltage supply circuit comprising:
- a first differential amplifier that receives a voltage of an output node and a first voltage as input voltages, and activates its output signal when the voltage of said output node is lower than said first voltage;
a second differential amplifier that receives the voltage of said output node and a second voltage which is higher than said first voltage as input voltages, and activates its output signal when the voltage of said output node is higher than said second voltage;
a first driving circuit that connects said output node to a high power supply line in response to the activation of the output signal of said first differential amplifier, and connects said output node to a low power supply line in response to the activation of the output signal of said second differential amplifier; and
a second driving circuit that connects said output node to said high power supply line in response to the activation of the output signal of said first differential amplifier, and connects said output node to said low power supply line in response to the activation of the output signal of said second differential amplifier, only during an activation period of a drivability control signal, whereineach of said first and second differential amplifiers includesa differential amplifying part that activates the output signal according to a magnitude relation between the input voltages anda current control part that is connected to said differential amplifying part, and increases a bias current in response to the activation of said drivability control signal.
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Accused Products
Abstract
Each of first and second differential amplifiers has a function of increasing a bias current in response to the activation of a drivability control signal. A first driving circuit connects an output node to a high power supply line in response to the activation of an output signal of the first differential amplifier, and connects the output node to a low power supply line in response to the activation of an output signal of the second differential amplifier. Only during the activation period of the drivability control signal, a second driving circuit connects the output node to the high power supply line in response to the activation of the output signal of the first differential amplifier, and connects the output node to the low power supply line in response to the activation of the output signal of the second differential amplifier.
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Citations
7 Claims
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1. A voltage supply circuit comprising:
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a first differential amplifier that receives a voltage of an output node and a first voltage as input voltages, and activates its output signal when the voltage of said output node is lower than said first voltage; a second differential amplifier that receives the voltage of said output node and a second voltage which is higher than said first voltage as input voltages, and activates its output signal when the voltage of said output node is higher than said second voltage; a first driving circuit that connects said output node to a high power supply line in response to the activation of the output signal of said first differential amplifier, and connects said output node to a low power supply line in response to the activation of the output signal of said second differential amplifier; and a second driving circuit that connects said output node to said high power supply line in response to the activation of the output signal of said first differential amplifier, and connects said output node to said low power supply line in response to the activation of the output signal of said second differential amplifier, only during an activation period of a drivability control signal, wherein each of said first and second differential amplifiers includes a differential amplifying part that activates the output signal according to a magnitude relation between the input voltages and a current control part that is connected to said differential amplifying part, and increases a bias current in response to the activation of said drivability control signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor memory comprising:
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a plurality of memory cells; a plurality of pairs of bit lines that are correspondingly connected to said memory cells; a plurality of equalizing circuits that are provided to correspond to said pairs of bit lines; a plurality of precharging circuits that are provided to correspond to said pairs of bit lines in order to connect said pairs of bit lines to a precharging voltage line; a voltage supply circuit whose output node is connected to said precharging voltage line; and a control circuit that activates a drivability control signal to said voltage supply circuit when a current to be supplied to said precharging voltage line by said voltage supply circuit needs to be increased, wherein said voltage supply circuit includes a first differential amplifier that receives a voltage of said output node and a first voltage as input voltages, and activates its output signal when the voltage of said output node is lower than said first voltage, a second differential amplifier that receives the voltage of said output node and a second voltage which is higher than said first voltage as input voltages, and activates its output signal when the voltage of said output node is higher than said second voltage, a first driving circuit that connects said output node to a high power supply line in response to the activation of the output signal of said first differential amplifier, and connects said output node to a low power supply line in response to the activation of the output signal of said second differential amplifier, a first switch circuit that receives an output signal of said first differential amplifier, and transmits the output signal of said first differential amplifier to an output side by turning itself on in response to the activation of said drivability control signal, a second switch circuit that receives the output signal of said second differential amplifier, and transmits the output signal of said second differential amplifier to an output side by turning itself on in response to the activation of said drivability control signal, and a second driving circuit that connects said output node to said high power supply line in response to the activation of an output signal of said first switch circuit, and connects said output node to said low power supply line in response to the activation of an output signal of said second switch circuit, only during an activation period of said drivability control signal, in which each of said first and second differential amplifiers has a differential amplifying part that activates the output signal according to a magnitude relation between the input voltages and a current control part that is connected to said differential amplifying part, and increases a bias current in response to the activation of said drivability control signal.
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Specification