Electronic circuit, semiconductor device, electronic equipment, and timepiece

Abstract

A constant-voltage generation circuit 100 creates a constant voltage. This constant-voltage generation circuit 100 comprises a first voltage creation circuit 110 for creating a reference voltage and a second voltage creation circuit 130 for creating the constant voltage which has a predetermined relationship with the reference voltage. The first voltage creation circuit 110 comprises a first constant-current source 150 - 1 for supplying a constant current and a first voltage-control transistor 112, through which this constant current flows, for outputting the reference voltage on the basis of a predetermined potential. The constant current is set to a value within the saturated operating region of the first voltage control transistor 112.

What is claimed is:  
     
         1 . An electronic circuit comprising: 
 a constant-voltage generation circuit for outputting a predetermined constant voltage; and    a crystal oscillation circuit that is driven to oscillate by said constant voltage supplied from said constant-voltage generation circuit;    wherein the temperature characteristics of an oscillation-stopped voltage of said crystal oscillation circuit and the constant voltage that is output from said constant-voltage generation circuit are set to be the same.    
     
     
         2 . The electronic circuit as defined in    claim 1   , 
 wherein said constant-voltage generation circuit comprises at least one voltage-control transistor supplied with a predetermined constant current, for outputting at least one of a reference voltage and a comparison voltage for controlling said constant voltage to be output; and    wherein said constant current is set to a value such that the total magnitude of voltage variation within a guaranteed operating temperature range of said voltage-control transistor is substantially the same as the magnitude of variation of said oscillation-stopped voltage within the guaranteed operating temperature range.    
     
     
         3 . The electronic circuit as defined in    claim 1   , 
 wherein the absolute value of said constant voltage is equal to or greater than the absolute value of the oscillation-stopped voltage of said crystal oscillation circuit supplied with said constant voltage.    
     
     
         4 . The electronic circuit as defined in    claim 1   , wherein the electronic circuit is provided in a semiconductor device.  
     
     
         5 . The electronic circuit as defined in    claim 1   , wherein the electronic circuit is provided in an electronic equipment and an operating reference signal is generated from an oscillation output of said crystal oscillation circuit.  
     
     
         6 . The electronic circuit as defined in    claim 1   , wherein the electronic circuit is provided in a timepiece and a timepiece reference signal is generated from an oscillation output of said crystal oscillation circuit.  
     
     
         7 . The electronic circuit as defined in    claim 4   , wherein an operating reference signal is generated from an oscillation output of said crystal oscillation circuit.  
     
     
         8 . The electronic circuit as defined in    claim 4   , wherein a timepiece reference signal is generated from an oscillation output of said crystal oscillation circuit.