Voltage regulated circuit with well resistor divider

#1. Field of the Invention

#This invention relates to a voltage regulated circuit, more particularly, to a voltage regulated circuit with a well resistor divider. The present invention applies two well resistors act as the voltage regulated circuit to make an output voltage become a stable voltage value.

#2. Description of the Prior Art

#In the accompanying drawing forming a material part of this description, there is shown:

#FIG. 1 shows a diagram of the voltage regulated circuit;

#FIG. 2 shows a diagram in using the well resistor to be the first resistor in the semiconductor circuit;

#The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:

#A voltage regulated circuit is an important circuit in the integrated circuits. Because the voltage regulated circuit can control an output voltage to become a fixed value, several integrated circuits will be kept in the normal operations. When an input voltage is a voltage value whose varied range is fixed, the voltage regulated circuit will absorb the over high input voltage and provide a stable voltage to several circuits

#Referring to FIG. 1, this shows a diagram of the voltage regulated circuit. The voltage regulated circuit comprises the first resistor 100 and the second resistor 200. One end of the first resistor 100 is connected with one end of the second resistor 200 and the first resistor 100 and the second resistor 200 are in the series condition. A source voltage (Vcc) 300 is connected with the other end of the first resistor 100 and a referred voltage (Vref) 400 is pulled from a place, which is connected with the first resistor 100 and the second resistor 200. The resistance of the first resistor 100 is R1 and the resistance of the second resistor 200 is R2. The other end of the second resistor 200 is connected with a ground. Therefore, the referred voltage 400 is equal to the value, which is got from the source voltage and the ratio of the second resistor's resistance to the total resistance (R1+R2) to be multiplied together (Vref=Vcc*(R2/(R1+R2))). If the common resistors are used to be the first resistor 100 and the second resistor 200, the referred voltage 400 value will increase when the source voltage 300 is increased. When the well resistor of the present invention is used to be the first resistor 100, the voltage, which is in the first resistor 100 will be increased and the depletion region of the well resistor will extend to increase the resistance and to deplete the over-high voltage value to make the referred voltage 400 become a stable value when the source voltage 300 is increased.