Resistance hybrid, and voltage detection and constant voltage generating circuits incorporating such resistance hybrid
a technology of resistance hybrid and constant voltage generating circuit, which is applied in the direction of adjustable resistors, semiconductor devices, instruments, etc., can solve the problems of increasing the number of fuses to be connected, a certain amount of error, and inability to form set resistance elements beforehand
Inactive Publication Date: 2006-09-07
ITOH KOHZOH
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- Claims
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Benefits of technology
[0030] Accordingly, it is an object of the present disclosure to provide a resistance hybrid, and voltage detection and constant voltage generating circuits incorporating such resistance hybrid as the voltage divider, having most, if not all, of the advantages and features of similar employed circuits, while eliminating many of the aforementioned disadvantages.
[0031] It is another object to provide a resistance hybrid capable of being suitably adjusted the resistance thereof by disconnecting its component resistance element without undue increase in hybrid circuit area, and also to provide voltage detection and constant voltage generating circuits incorporating such resistance hybrid.
[0035] As result, the resistance error possibly caused by the exclusive resistance element can be alleviated. In addition, since the element to be added are only some of the error correction resistance elements in the present hybrid structure, the increase in resistance area can remain to be relatively small.
[0041] Since the dividing resistors incorporated into the circuit are formed of the resistance hybrid disclosed herein, the resistance error, which is possibly caused by disconnection of the exclusive resistance element, can be alleviated. As a result, the voltage error detected by the voltage detection circuit can be reduced.
[0044] Since the dividing resistors incorporated into the circuit are formed of the resistance hybrid disclosed herein, the resistance error, which is possibly caused by the disconnection of exclusive resistance element, can be alleviated. As a result, the error in output voltage from the constant voltage generation circuit can be reduced.
Problems solved by technology
. . , RLm, cannot be neglected, and there arises a certain amount of error.
Therefore, there has been encountered a drawback previously, in which the set resistance elements cannot necessarily be formed beforehand including therein the above mentioned error components.
In addition, if there is a certain error in the resistance hybrid of FIG. 7, this may give rise to another drawback for several circuits such as, for example, constant voltage generating circuit and voltage detection circuit, which utilize the resistance hybrid as a voltage divider.
This gives rise to further drawbacks such as, for example, the increase in, the number of fuses to be connected, and the interval therebetween, and the concomitant increase in the fuse area which is required for securely carrying out the fuse disconnection.
Method used
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[0033] A resistance hybrid disclosed herein includes a plurality of unit resistors connected either in series or in parallel. The unit resistors each consist of a set resistance element, an error correction resistance element, and an exclusive resistance element for disconnection; the set resistance element and the error correction resistance element are connected in series to form a series resistance element, and the series resistance element and the exclusive resistance element for disconnection are connected in parallel, in which the resistance of the error correction resistance element is equal to the combined resistance of the set resistance element, the error correction resistance element, and the exclusive resistance element for disconnection, prior to disconnecting the exclusive resistance element.
[0034] Following the disconnection of the exclusive resistance element, the resistance value of the unit resistor becomes equal to the combined resistance of set resistance eleme...
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A resistance hybrid is disclosed including m+1 unit resistors connected in series, to further be connected in series between two resistance elements, one Rbottom and the other Rtop. Each unit resistor SBn includes an error correction resistance element Rldn and a set resistance element RTn connected in series, and further connected in parallel to a fuse RLn. In addition, the error correction resistance element Rldn is formed such that the combined resistance of the fuse RLn, set resistance element RTn, and error correction resistance element Rldn, is equal to the resistance value of the error correction resistance element Rldn. The value of resistance of the unit resistor SBn after the disconnection increases by the resistance value of set resistance element RTn, to thereby obviating the error possibly caused by the disconnection, which is originated from the resistance value of the fuse RLn. The resistance error caused by the disconnection can be reduced in the present resistance hybrid without appreciable increase in the resistance area, which is particularly advantageous in use for analogue circuits in various semiconductor integrated circuits such as voltage detection and constant voltage generating circuits.
Description
[0001] This document claims priority and contains subject matter related to Japanese Patent Application No. 2001-142873, filed with the Japanese Patent Office on May 14, 2001, the entire contents of which are hereby incorporated by reference. FIELD OF INVENTION [0002] This patent specification relates to a resistance hybrid capable of being suitably adjusted the resistance thereof by disconnecting its component resistance element and to voltage detection and constant voltage generating circuits incorporating such resistance hybrid, which are in use for analogue circuits in various semiconductor integrated circuits. BACKGROUND OF THE INVENTION [0003] With the increase of usefulness of resistance hybrids and various circuits incorporating resistance hybrids in the field of integrated analogue circuitry, precise resistance adjustment in the resistance hybrid without undue increase in hybrid circuit area is of great importance. [0004] As illustrated in FIG. 5, for example, a constant vo...
Claims
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IPC IPC(8): H01C7/00G05F1/565H01L27/08
CPCG05F1/565H01L27/0802
InventorITOH, KOHZOH
OwnerITOH KOHZOH