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Reference-voltage-generating-circuit-and-A-D-and-D-A-converters-using-the-same

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Reference voltage generating circuit, and A/D and D/A converters using the same

Details

Inventors: Hosotani, Shiro; Miki, Takahiro;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Williams; Howard L.
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Price, LeBlanc & Becker

A reference voltage generating circuit is disclosed which generates a plurality of linear analog voltages and is desirably applied to A/D and D/A converters. As the reference voltage generating circuit itself or a resistor network comprised therein, a resistor network is employed which comprises a plurality of resistor elements connected in series between two power sources and resistor networks (or resistor elements) connected to all the other nodes than the two nodes closest to the two power sources, respectively, out of the nodes between the former resistor elements. The above-mentioned plurality of resistor elements have the same resistance value r and the output impedance (or resistance value) of the resistor networks (or resistor elements) connected to all the nodes above is set to a value twice the resistance value r of the above-mentioned resistor elements, or 2r. Accordingly, output impedance at any of the nodes between said plurality of resistor elements represents 2.multidot.r/3. A a result, inequality of output impedances between the output terminals of the reference voltage generating circuit can be improved.

DETAILED DESCRIPTION An object of the present invention is to provide a reference voltage generating circuit having a low output impedance.
Another object of the present invention is to provide a reference voltage generating circuit in which difference of output impedances between all output terminals are reduced.
Still another object of the present invention is to provide a reference voltage generating circuit superior in its circuit accuracy.
A further object of the present invention is to provide a reference voltage generating circuit which is superior in its circuit accuracy and has an output impedance at least as low as that of a conventional reference voltage generating circuit and approximately the same impedance at all output terminals.
A still further object of the present invention is to provide a reference voltage generating circuit which can enhance performance of an A/D converter.
A further object of the present invention is to provide a reference voltage generating circuit which can enhance performance of a D/A converter.
Another object of the present invention is to provide an A/D converter which has an enhanced operation speed.
Still another object of the present invention is to provide a D/A converter which has an enhanced operation speed.
In order to obtain the objects described above, a reference voltage generating circuit according to the present invention comprises a first reference voltage receiving terminal for receiving a first reference voltage, a second reference voltage receiving terminal for receiving a second reference voltage, a plurality of resistor elements connected in series between the first and second reference voltage receiving terminals and having the same resistance value r, and resistor networks provided corresponding to all the other nodes than the two nodes closest to the first and second reference voltage receiving terminals, respectively, out of the plurality of resistor elements.
Each resistor network is constituted of first and second resistor elements connected in series between the first and second reference voltage receiving terminals and having a composite impedance of 2

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