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Voltage-generating-device

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Voltage generating device

Details

Inventors: Ikeda, Masaharu;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Wong; Peter S.
Assistant Examiner: Berhane; Adolf
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher

A voltage generating device is capable of generating a voltage which does not depend upon temperature even if a power source voltage is not higher than 1.25 V. The device comprises an output terminal thereof, current sources, resistors and a diode like connected transistor. A voltage on the output terminal is obtained by causing a current to flow through series-connected resistors. The current sources are band gap current sources. The current source is assumed as opened. A part of the diode like connected transistor is represented by an equivalent circuit including a voltage source and a resistor. The equivalent circuit and the resistors are represented by an equivalent circuit by using the Thevenin's theorem.

DETAILED DESCRIPTION The present invention aims at solving the above mentioned problems of the prior art.
It is therefore an object of the present invention to provide an excellent voltage generating device which is capable of providing a voltage which is independent of temperature even if a power source voltage is not greater than 1.
25 V.
In order to accomplish the above mentioned object, the present invention provides a voltage generating device comprising: a diode; biasing means for generating a forward voltage across the diode; voltage dividing means for dividing the forward voltage which is generated by the biasing means; and current generating means for causing a current to flow through a divided voltage output of the voltage dividing means; wherein a voltage which is independent of temperature can be obtained even if the power source voltage is equal to or less than 1.
25 V.
In order to accomplish the above mentioned object, the present invention further provides a voltage generating device comprising: a diode; voltage dividing means for dividing a terminal voltage across the diode; and current generating means for causing a current to flow through a divided voltage output of the voltage dividing means; wherein a voltage which is independent of temperature can be obtained even if a power source voltage is equal to or less than 1.
25 V.
Accordingly, in accordance with the former invention, the forward voltage which negatively changes with the temperature which is obtained by causing the forward current to flow through the diode from the biasing means is divided by the voltage dividing means and a voltage which positively changes with temperature is properly superposed upon the divided forward voltage by the current generating means and the voltage dividing means.
Thus, a voltage which is independent of temperature can be obtained even if the power source voltage is equal to or less than 1.
25 V.
If the output voltage Vo is preset equal to or less than 0.
7 V and the current generating means is formed of a low voltage operating type source, as is disclosed in JP-A-60-191508, the power source voltage can be lowered to 0

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