Voltage generation circuit

Abstract

A voltage generation circuit includes a plurality of voltage generation units each configured to include an internal voltage with a reference voltage, generate a detection signal based on a comparison result between the internal voltage and the reference voltage, and adjust the level of the internal voltage in response to an oscillation signal, a control unit configured to generate an oscillation control signal in response to the detection signals, an oscillator configured to generate the oscillation signal in response to the oscillation control signal, and a selective output unit configured to selectively supply the oscillation signal to one or more of the plurality of voltage generation units in response to the detection signals.

What is claimed is: 
     
         1 . A voltage generation circuit, comprising:
 a plurality of voltage generation units each configured to generate an internal voltage in response to an oscillation signal; and   an oscillator shared by the plurality of voltage generation units and configured to generate the oscillation signal,   wherein the oscillation signal is supplied only to a one or more of the plurality of voltage generation units that output internal voltages each deviating from a target level.   
     
     
         2 . The voltage generation circuit according to  claim 1 , further comprises:
 a control unit configured to generate an oscillation control signal in response to detection signals; and   a selective output unit configured to selectively supply the oscillation signal to a part of the plurality of voltage generation units in response to the detection signals.   
     
     
         3 . The voltage generation circuit according to  claim 1 , wherein each of the plurality of voltage generation units comprises:
 a pump configured to adjust a level of the internal voltage in response to the oscillation signal; and   a detector configured to generate detection signals by comparing the internal voltage with a reference voltage.   
     
     
         4 . The voltage generation circuit according to  claim 3 , wherein the detector is configured to compare a division voltage, divided in a proper division ratio so that the internal voltage corresponds to the reference voltage, with the reference voltage and to generate the detection signals. 
     
     
         5 . The voltage generation circuit according to  claim 2 , wherein the control unit is configured to generate the oscillation control signal when any one of the detection signals is enabled. 
     
     
         6 . The voltage generation circuit according to  claim 2 , wherein the selective output unit is configured to supply the oscillation signal to one or more voltage generation units that output enabled detection signals, from the plurality of voltage generation units. 
     
     
         7 . The voltage generation circuit according to  claim 2 , wherein the selective output unit is configured to prevent the oscillation signal from being inputted to one or more voltage generation units that output disabled detection signals, from among the plurality of voltage generation units. 
     
     
         8 . The voltage generation circuit according to  claim 2 , wherein the selective output unit comprises a plurality of selective output units configured to perform an AND operation on each of the detection signals and the oscillation signal. 
     
     
         9 . The voltage generation circuit according to  claim 2 , wherein the control unit comprises a plurality of logic gates configured to perform an OR operation on the detection signals to output a result as the oscillation control signal.