Internal power supply voltage generation circuit

Abstract

Provided is an internal power supply voltage generation circuit, with which a through current that flows during the operation of a logic circuit can be prevented from being excessive due to fluctuations in threshold voltage of a P-type transistor and an N-type transistor forming the logic circuit, and current consumption can be suppressed. Provided is an internal power supply voltage generation circuit for generating an internal power supply voltage at an internal power supply terminal and supplying the internal power supply voltage to a logic circuit, the internal power supply voltage generation circuit including a transistor having a source follower configuration for outputting a voltage applied to a gate thereof. A value of the internal power supply voltage is given based on the sum of an absolute value of a threshold voltage of an N-type transistor and an absolute value of a threshold voltage of a P-type transistor.

Description

technical field [0001] The present invention relates to an internal power supply voltage generation circuit for generating an internal power supply voltage of an internal power supply terminal and supplying the internal power supply voltage to a logic circuit. Background technique [0002] A conventional internal power supply voltage generating circuit will be described. Figure 7 It is a block diagram showing a conventional internal power supply voltage generating circuit. [0003] The saturation-connected transistor 701 uses a source follower structure to step down the voltage VDD given to the gate to the internal power supply voltage DVDD and output it. The logic circuit 702 operates depending on the internal power supply voltage DVDD and the ground voltage VSS. [0004] Examples of the logic circuit 702 include a circuit that outputs a high-level or low-level signal, such as an oscillation circuit, a counter that counts the number of input pulses, and the like. [0005...

AI Technical Summary

Problems solved by technology

[0010] Therefore, there is a problem that when the absolute value of the threshold voltage of the P-type transistor and the N-type transistor constituting the logic circuit 702 deviates slightly, the through current when the logic circuit 702 operates becomes too large, resulting in an increase in current consumption.

[0011] That is, the through current when the logic circuit 702 supplied with the internal power supply voltage DVDD operates depends on the threshold voltages of the P-type transistor and the N-type transistor constituting the logic circuit, resulting in an increase in current consumption.

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