Semiconductor device with resistor element

Abstract

A semiconductor device includes first, second, third and fourth resistor elements. The first to fourth resistor elements have first ends commonly connected to a first node, and operate in one of first and second operation modes which are switchable. The first and second resistor elements have second ends connected to a second node and a third node, respectively. The third and fourth resistor elements have second ends connected to a fourth node and a fifth node via a first switch and a second switch, respectively. The first and second switches are opened in the first operation mode, and are closed in the second operation mode.

1 - 21 . (canceled)  
   
   
       22 . A semiconductor device comprising: 
 a first power supply terminal and a second power supply terminal;    a first charging circuit having one end connected to the first power supply terminal and the other end connected to one end of a resistor element;    a discharging circuit having one end connected to the other end of the resistor element, and the other end connected to the second power supply terminal;    a capacitor having one end connected to said one end of the resistor element, and the other end connected to the second power supply terminal; and    a second charging circuit having one end connected to the first power supply terminal, and the other end connected to said other end of the resistor element.    
   
   
       23 . The semiconductor device according to  claim 22 , wherein the first power supply terminal is a positive power supply terminal, the second power supply terminal is a ground terminal, each of the first and second charging circuits includes a PMOS transistor, and the discharging circuit includes an NMOS transistor.  
   
   
       24 . The semiconductor device according to  claim 22 , further comprising a third charging circuit having one end connected to the first power supply terminal, and the other end connected to a middle point of the resistor element.  
   
   
       25 . The semiconductor device according to  claim 22 , further comprising a plurality of auxiliary charging circuits each having one end commonly connected to the first power supply terminal, and the other end connected to an associated one of a plurality of intermediate points of the resistor element.  
   
   
       26 . The semiconductor device according to  claim 22 , wherein the first power supply terminal is a ground terminal, the second power supply terminal is a positive power supply terminal, each of the first and second charging circuits includes an NMOS transistor, and the discharging circuit includes a PMOS transistor.  
   
   
       27 . The semiconductor device according to  claim 26 , further comprising a third charging circuit that includes an NMOS transistor having one end connected to the first power supply terminal, and the other end connected to a middle point of the resistor element.  
   
   
       28 . The semiconductor device according to  claim 27 , further comprising a plurality of auxiliary charging circuits that include NMOS transistors each having one end connected to the first power supply terminal, and the other end connected to an associated one of a plurality of intermediate points of the resistor element.  
   
   
       29 . The semiconductor device according to  claim 22 , wherein the first charging circuit and the second charging circuit include substantially equal driving performances.