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Comparator

A technology of comparator and comparison unit, which is applied in the direction of DC level change, pulse shaping, multiple input and output pulse circuits, etc., and can solve problems such as insufficient and difficult

Inactive Publication Date: 2008-06-25
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to install components in order to reduce the relative dispersion of the resistance ratio to less than ±5%.
Moreover, when the resistance ratio has a relatively ±5% dispersion, in the comparator shown in Figure 7, the circuit structure in the worst case, the difference Vo of the input voltage Vinp, Vinn occurs ±20 to 30%. Adding up the dispersion of the reference voltage Vref (about ±10%), the offset voltage Voffset may produce a dispersion of about 30 to 40%.
Therefore, in view of the more and more stringent setting requirements in the future, the structure of the prior art shown in Figure 7 may not be sufficient, and it is necessary to further reduce the dispersion

Method used

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no. 2 Embodiment approach

[0029]

FIG. 2 is a circuit diagram showing a second embodiment of a comparator according to the present invention.

[0030]

As shown in the figure, the comparator of this embodiment includes an offset addition unit 6 and a comparison unit 7 instead of the offset subtraction unit 4 and the comparison unit 5 described above.

[0031]

Therefore, the same reference numerals as those in FIG. 1 are assigned to the same components as in the first embodiment, and the description thereof will not be repeated. The following description will focus on the characteristic part of this embodiment (introduction of the offset addition unit 6).

[0032]

The offset addition unit 6 is means for adding the offset voltage Voffset to the inverted input voltage Vinn, and includes a P-channel type field effect transistor 61 and a resistor 62 (resistance value: R2).

[0033]

In the bias addition unit 6, one end of the resistor 62 is connected to the output terminal of the buffer unit 3 (and f...

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Abstract

A comparator has: an offset setting portion adapted to set an offset voltage; an offset subtracting portion adapted to subtract the offset voltage from a non-inverting input voltage; and a comparing portion adapted to shift the output logic level thereof according to which of the output voltage of the offset subtracting portion and an inverting input voltage is higher.

Description

technical field [0001] The present invention relates to biased comparators. Background technique [0002] In the prior art, according to the difference between the input voltages Vinp and Vinn (Vinp-Vinn) or greater or less than the specified offset voltage Voffset, the output logic COMP-OUT is changed to a high level or a low level. A single biased comparator is used for various purposes (refer to Figure 5). [0003] In addition, as an example of a method for realizing the above-mentioned offset, it is conceived to intentionally break the balance of the differential pair (refer to transistors 104 and 105 in FIG. 6 ) constituting the input stage of the comparator according to the required offset voltage Voffset. . [0004] In addition, as shown in FIG. 7, it is also conceivable to use a subtraction circuit (resistors 203-206 and amplifier 207) to obtain the difference Vo (=Vinp-Vinn) of the input voltages Vinp and Vinn, and input it to the comparison circuit 208, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/08
CPCH03K5/003H03K5/24H03K5/22
Inventor 藤原正勇中村健哉
Owner ROHM CO LTD