CN203537370U - Threshold logic circuit based on CMOS operational amplifier - Google Patents
Threshold logic circuit based on CMOS operational amplifier Download PDFInfo
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- CN203537370U CN203537370U CN201320676463.0U CN201320676463U CN203537370U CN 203537370 U CN203537370 U CN 203537370U CN 201320676463 U CN201320676463 U CN 201320676463U CN 203537370 U CN203537370 U CN 203537370U
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- operational amplifier
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- resistance
- threshold
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Abstract
The utility model discloses a circuit capable of realizing threshold logic based on a CMOS operational amplifier. The circuit is constituted by an input resistor array, an operational amplifier, and a phase inverter. A threshold value is determined by a reference voltage and input weights, and the weights of various input ends are only related to a ratio between a feedback resistor and an input resistor, and therefore the strong reconfigurability can be provided, and various different logic functions can be realized. The threshold logic circuit based on the operational amplifier is advantageous in that the structure is simple, the reconfigurability is strong, and the circuit can be used as the basic unit applied in the neutral network and other fields.
Description
Technical field
The utility model relates to technical field of integrated circuits, particularly a kind of threshold logic cirtuic based on cmos operational amplifier.
Background technology
The logic function that voting logic is powerful and significant advantage, once paid close attention to it widely.Voting logic has the logical process more complicated than Boolean logic, so it can more effectively realize logic function.Circuit design based on voting logic, can the function of intensifier circuit and the integrated level of raising circuit.In addition, threshold logic cirtuic can also be applied in the fields such as neural net as an elementary cell.Therefore, the research of threshold logic cirtuic has great importance.
At present, based on the transistorized threshold logic cirtuic of CMOS, mainly comprise capacitor type and current mode.But because these circuit can not be realized the function of voting logic well, the research of voting logic is lowered the temperature gradually.The utility model is attempted effectively to realize voting logic with a kind of circuit based on cmos operational amplifier.
Utility model content
The purpose of this utility model is to provide a kind of threshold logic cirtuic based on cmos operational amplifier, and this circuit has very strong restructural characteristic, only needs to change input resistance, and feedback resistance and reference voltage just can be realized multiple different logic function.
The utility model adopts following scheme to realize: a kind of threshold logic cirtuic based on cmos operational amplifier, is characterized in that: comprise first signal V
1input, secondary signal V
2input, the 3rd signal V
3input and a voltage V
outoutput; Described first signal V
1input is through an input resistance R
1with a feedback resistance R
fone end and the anode of operational amplifier connect; Described secondary signal V
2input is through an input resistance R
2be connected with the anode of described operational amplifier; Described the 3rd signal V
3input is through an input resistance R
3be connected with the anode of described operational amplifier; The negative terminal of described operational amplifier connects a reference voltage; The output of described operational amplifier and described feedback resistance R
fthe other end and the input of an inverter connect; The output of described inverter and described voltage V
outoutput connects.
Threshold logic cirtuic of the present utility model is simple in structure, and only by an input resistance array, an operational amplifier and an inverter form.This circuit has very strong restructural characteristic, only needs to change input resistance, and feedback resistance and reference voltage just can be realized multiple different logic function.In a word, the advantage such as the threshold logic cirtuic based on cmos operational amplifier has simple in structure, and reconfigurability is strong, can be applied to the fields such as neural net as an elementary cell.
Accompanying drawing explanation
Fig. 1 is the threshold logic cirtuic schematic diagram of the utility model based on cmos operational amplifier.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figure 1, the utility model provides a kind of threshold logic cirtuic based on cmos operational amplifier, it is characterized in that: comprise first signal V
1input, secondary signal V
2input, the 3rd signal V
3input and a voltage V
outoutput; Described first signal V
1input is through an input resistance R
1with a feedback resistance R
fone end and the anode of operational amplifier connect; Described secondary signal V
2input is through an input resistance R
2be connected with the anode of described operational amplifier; Described the 3rd signal V
3input is through an input resistance R
3be connected with the anode of described operational amplifier; The negative terminal of described operational amplifier connects a reference voltage; The output of described operational amplifier and described feedback resistance R
fthe other end and the input of an inverter connect; The output of described inverter and described voltage V
outoutput connects.
In order better to allow those skilled in the art understand threshold circuit of the present utility model, below the logical expression of threshold circuit is described.The voting logic operation principle of this threshold logic cirtuic is according to the total input value of weight calculation of input, and total input value and threshold value are compared.If total input value is more than or equal to threshold value, is output as logical one, otherwise is logical zero.Voting logic will be satisfied logical equation be:
（1）
Wherein, w
ifor input x
icorresponding weight, n is the number of input, θ is threshold value.
Please continue referring to Fig. 1, this circuit is by the electric resistance array of one three input, and an operational amplifier and an inverter form.Electric resistance array and operational amplifier are for generation of V
out1, the inverter consisting of CMOS transistor is for generation of V
out.Meanwhile, operational amplifier should have higher gain, makes its input meet the condition of " empty short void is disconnected ".It is as described below that this circuit is realized the derivation of voting logic.
Operational amplifier gain in Fig. 1 is enough large, meets the condition of " empty short void is disconnected ", and positive terminal voltage equates for V with negative terminal voltage
ref, output voltage (V
out1) meet:
Wherein, R
1, R
2, R
3for input resistance, R
ffor feedback resistance, V
reffor reference voltage.V
out1can abbreviation be:
Order
,
,
, formula (3) can turn to:
V
out1after inverter, its value becomes V
out, be expressed as:
Order
, have:
Wherein,
can think the total input value of input voltage after electric resistance array weighting, and
threshold value for this circuit.The weight w of input voltage
1, w
2, w
3ratio by feedback resistance and input resistance determines.By different resistance ratios is set, just can change the weight of input, realize new logic function.
From formula (6), this circuit can be realized the weighted sum to three input voltages, and the total input value obtaining is compared with a threshold voltage, and then obtains final output.The threshold value of circuit is only relevant with input weight with reference voltage, and the weight of each input is determined by the ratio of feedback resistance and input resistance.By changing reference voltage, feedback resistance and input resistance, can change input weight and threshold value.Therefore, this circuit has stronger reconfigurable function.
The foregoing is only preferred embodiment of the present utility model, all equalizations of doing according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (1)
1. the threshold logic cirtuic based on cmos operational amplifier, is characterized in that: comprise first signal V
1input, secondary signal V
2input, the 3rd signal V
3input and a voltage V
outoutput; Described first signal V
1input is through an input resistance R
1with a feedback resistance R
fone end and the anode of operational amplifier connect; Described secondary signal V
2input is through an input resistance R
2be connected with the anode of described operational amplifier; Described the 3rd signal V
3input is through an input resistance R
3be connected with the anode of described operational amplifier; The negative terminal of described operational amplifier connects a reference voltage; The output of described operational amplifier and described feedback resistance R
fthe other end and the input of an inverter connect; The output of described inverter and described voltage V
outoutput connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676463.0U CN203537370U (en) | 2013-10-31 | 2013-10-31 | Threshold logic circuit based on CMOS operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676463.0U CN203537370U (en) | 2013-10-31 | 2013-10-31 | Threshold logic circuit based on CMOS operational amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203537370U true CN203537370U (en) | 2014-04-09 |
Family
ID=50423540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320676463.0U Expired - Fee Related CN203537370U (en) | 2013-10-31 | 2013-10-31 | Threshold logic circuit based on CMOS operational amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203537370U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560781A (en) * | 2013-10-31 | 2014-02-05 | 福州大学 | Threshold logic circuit based on CMOS operational amplifier |
| CN112290931A (en) * | 2020-12-07 | 2021-01-29 | 南京元络芯科技有限公司 | Compound semiconductor-based logic control circuit |
-
2013
- 2013-10-31 CN CN201320676463.0U patent/CN203537370U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560781A (en) * | 2013-10-31 | 2014-02-05 | 福州大学 | Threshold logic circuit based on CMOS operational amplifier |
| CN112290931A (en) * | 2020-12-07 | 2021-01-29 | 南京元络芯科技有限公司 | Compound semiconductor-based logic control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20181031 |