CN110321597B - Differential input operation circuit based on memristor - Google Patents

Differential input operation circuit based on memristor Download PDF

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CN110321597B
CN110321597B CN201910491724.3A CN201910491724A CN110321597B CN 110321597 B CN110321597 B CN 110321597B CN 201910491724 A CN201910491724 A CN 201910491724A CN 110321597 B CN110321597 B CN 110321597B
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memristor
diode
capacitor
input
circuit
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丁芝侠
胡蝶
陈冲
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Wuhan Institute of Technology
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Abstract

The invention relates to the technical field of digital analog circuits, and discloses a differential input operation circuit based on a memristor. The low-pass filter circuit is applied to an effective and accurate differential dual-input circuit, has a simple structure, can realize the amplification function of a low-frequency signal through two inputs with opposite polarities, and has the advantages of small signal amplification, strong anti-interference, simpler structure, wide application prospect and the like.

Description

Differential input operation circuit based on memristor
Technical Field
The invention relates to the technical field of digital analog circuits, in particular to a differential input operation circuit based on a memristor.
Background
Memristors (Memristor) were proposed in anticipation from a symmetry perspective by professor of the american scientist begonia (leon.o.chua) at berkeley division, university of california, 1971. The real-meaning physical memristor is manufactured for the first time by the Hewlett packard laboratory in the United states until 2008. At present, memristors are emerging microscopic circuit devices, research on memristors at home and abroad is still in the beginning stage, the first memristor in the world comes under a severe experimental environment, so that at present, laboratories capable of directly carrying out experimental research on the memristors are few and few, and therefore, realization of the memristors still has many difficulties.
The memristor represents the relationship between the charge and the magnetic flux, which is a dynamic element, and is a fourth basic element besides the resistance, the capacitance, and the inductance. Experiments show that the influence of the memristor on the oscillating circuit is smaller and smaller along with the increase of the working frequency of the memristor, in other words, the memristor has better memristor characteristics when working at low frequency.
In a traditional analog filter circuit, in order to realize adjustable cut-off frequency, a potentiometer is generally selected to replace a resistor in the circuit, the cut-off frequency in the filter circuit is indirectly adjusted by manually adjusting the resistance value of the potentiometer, and dynamic control is not easy to realize; in addition, the temperature stability of the potentiometer is not high, and the zero drift phenomenon caused by the influence of temperature is serious.
Disclosure of Invention
Based on the above problems, the differential input operation circuit based on the memristor provided by the invention applies the low-pass filter circuit to an effective and accurate differential dual-input circuit, can realize the amplification function of a low-frequency signal through two inputs with opposite polarities, and has the advantages of small signal amplification, strong interference resistance, wide application prospect and the like.
In order to solve the technical problems, the invention provides a memristor-based differential input operation circuit which comprises a differential proportion amplifying circuit, wherein the differential proportion amplifying circuit comprises two input ends and an output end, the output end and the two input ends of the differential proportion amplifying circuit are both connected with a memristor low-pass filter circuit, and input signals of the two input ends are signals with opposite polarities.
Further, the differential proportional amplifying circuit comprises an operational amplifier A with a positive phase input end, a negative phase input end and an output end, wherein the negative phase input end of the operational amplifier A is connected with a memristor Rm 2 And a capacitor C 2 Composed memristive filter LB 2 Memristor Rm 2 Is passed through a resistor R 1 A capacitor C connected to the inverting input signal source 2 One end and memristor Rm 2 Is connected to the output terminal of the capacitor C 2 The other end of the first and second electrodes is grounded; the positive phase input end of the operational amplifier A is connected with a memristor Rm 3 And a capacitor C 3 Composed memristive filter LB 3 Memristor Rm 3 Is passed through a resistor R 2 A capacitor C connected to the positive input signal source 3 One end and memristor Rm 3 Is connected to the output terminal of the capacitor C 3 The other end of the first and second electrodes is grounded; output end of operational amplifier A and memristor Rm 0 And a capacitor C 1 Composed memristive filter LB 1 Connected to memristor Rm 0 Is connected with the output signal terminal of the operational amplifier A, and a capacitor C 1 And memristor Rm 0 Is connected with the signal output terminal of the capacitor C 1 The left end of (2) is grounded; memristive filter LB 1 The output end of the differential input circuit is used as the output end of the differential input circuit; the non-inverting input end of the operational amplifier A passes through a resistor R 3 A memristor Rm is connected between the inverting input end and the output end of the operational amplifier A in parallel 1 。
Further, the memristor Rm 1 Memristor Rm 2 Memristor Rm 3 And memristor Rm 0 All comprise a diode D 1 Diode D 2 Diode D 3 And a diode D 4 The electric bridge formed by end-to-end connection is connected with a capacitor C 0 And a resistance R 0 Are connected in parallel; the diode D 1 Diode D 2 Diode D 3 And a diode D 4 The Venturi bridge function is realized, and the capacitor and the resistor form an RC oscillating circuit;
the Venturi bridge is a diode D 4 Cathode and diode D 1 The crossing point of the anode connection is the input end, and a diode D is used 3 Cathode of and diode D 2 The intersection point of the positive electrode connection is a single-input single-output circuit of the output end; diode D 4 Anode of (2) and diode D 3 Anode connected, diode D 1 Cathode and diode D 2 The negative electrodes are connected; capacitor C 0 Resistance R 0 Are all connected in parallel to the diode D 1 Cathode and diode D 2 Point of intersection of negative electrode connections and diode D 4 Anode and diode D 3 Between the intersections of the positive connections.
Compared with the prior art, the invention has the beneficial effects that: the low-pass filter circuit is applied to an effective and accurate differential motion double-input circuit, has a simple structure, can realize the amplification function of a low-frequency signal through two inputs with opposite polarities, and has the advantages of small signal amplification, strong anti-interference, simpler structure, wide application prospect and the like.
Drawings
FIG. 1 is a circuit diagram of a memristor-based differential input arithmetic circuit in embodiment 2;
FIG. 2 is a schematic view of a diode Venturi bridge in embodiment 2;
FIG. 3 is a schematic diagram of a memristive element in example 2;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
the differential input operation circuit based on the memristor comprises a differential proportion amplifying circuit, wherein the differential proportion amplifying circuit comprises two input ends and an output end, the output end and the two input ends of the differential proportion amplifying circuit are both connected with a memristor low-pass filter circuit, and input signals of the two input ends are signals with opposite polarities.
In this embodiment, two input signals of the differential proportional amplifying circuit are inputs after being filtered and compensated by the memristor filter circuit, and the output of the differential proportional amplifying circuit is also an output after being filtered and compensated by the memristor filter circuit; the memristive low-pass filter circuit can control the dynamic expansion range of a pass band and compensate the frequency drift phenomenon of an input signal when the frequency of a low-frequency band of the input signal is unstable; the differential proportional amplifying circuit can effectively suppress zero drift phenomena such as temperature and the like, and can suppress common-mode signals and interference signals. The memristor low-pass filter circuit is applied to an effective and accurate differential dual-input circuit, can realize the amplification function of a low-frequency signal through two inputs with opposite polarities, and has the advantages of capability of amplifying a tiny signal, strong interference resistance, wide application prospect and the like.
Example 2
Referring to fig. 1, 2 and 3, the differential input operational circuit based on the memristor comprises a differential proportional amplifying circuit, wherein the differential proportional amplifying circuit comprises an operational amplifier A with a positive phase input end, an inverse phase input end and an output end, and the inverse phase input end of the operational amplifier A is connected with a memristor Rm 2 And a capacitor C 2 Composed memristive filter LB 2 Memristor Rm 2 Is passed through a resistor R 1 A capacitor C connected to the inverting input signal source 2 One end and memristor Rm 2 Is connected to the output terminal of the capacitor C 2 The other end of the first and second electrodes is grounded; the positive phase input end of the operational amplifier A is connected with a memristor Rm 3 And a capacitor C 3 Composed memristive filter LB 3 Memory resistorRm 3 Is passed through a resistor R 2 A capacitor C connected to the positive input signal source 3 One end and memristor Rm 3 Is connected to the output terminal of the capacitor C 3 The other end of the first and second electrodes is grounded; output end of operational amplifier A and memristor Rm 0 And a capacitor C 1 Composed memristive filter LB 1 Connected to memristor Rm 0 Is connected with the output signal terminal of the operational amplifier A, and a capacitor C 1 And memristor Rm 0 Is connected to the signal output terminal of the capacitor C 1 The left end of (2) is grounded; memristive filter LB 1 The output end of the differential input circuit is used as the output end of the differential input circuit; the non-inverting input terminal of the operational amplifier A passes through a resistor R 3 A memristor Rm is connected between the inverting input end and the output end of the operational amplifier A in parallel 1 . Memristor Rm 1 Memristor Rm 2 Memristor Rm 3 And memristor Rm 0 All comprise a diode D 1 Diode D 2 Diode D 3 And a diode D 4 The electric bridge formed by end-to-end connection is connected with a capacitor C 0 And a resistance R 0 Are connected in parallel; the diode D 1 Diode D 2 Diode D 3 And a diode D 4 The Venturi bridge function is realized, and the capacitor and the resistor form an RC oscillating circuit; the Venturi bridge is a diode D 4 Cathode and diode D 1 The crossing point of the anode connection is the input end, and a diode D is used 3 Cathode of and diode D 2 The intersection point of the positive electrode connection is a single-input single-output circuit of the output end; diode D 4 Anode and diode D 3 Anode connected, diode D 1 Cathode and diode D 2 The negative electrodes are connected; capacitor C 0 And a resistor R 0 Are all connected in parallel to the diode D 1 Cathode and diode D 2 Point of intersection of negative electrode connections and diode D 4 Anode and diode D 3 Between the intersections of the positive connections.
In the embodiment, a substitute circuit of a memristor is adopted, and belongs to a generalized memristor circuit capable of realizing a memristor function, so that the memristor is represented byThe same structure. The memristor is composed of a diode, a capacitor and a resistor, the diode realizes the function of a Venturi bridge, and the capacitor and the resistor form an RC oscillation circuit; the diode D 1 Anode of (D) is connected with diode 4 The common terminal is connected with the input end of the memristor, and a diode D 1 Negative electrode of (D) is connected with diode 2 The common terminal of the negative electrode is connected with a capacitor C 0 One terminal of (D), diode D 2 Anode of (D) is connected with diode 3 The common terminal is connected with the output end of the memristor, and a diode D 3 Anode of (D) is connected with diode 4 The common terminal of the anode is connected with a capacitor C 0 And the other end of the diode D, and is grounded 4 Anode of (D) is connected with diode 1 The common terminal is connected with the input end of the memristor and the capacitor C 0 And a resistor R 0 Connected in parallel with a diode D 3 Anode and diode D 4 The common terminal of the anodes of (1) is commonly grounded. The following relationship is obtained from the circuit of the diode venturi bridge:
the input voltage and the current at two ends of the memristor simulated by the Wien bridge are respectively set to be V m And I m (ii) a Capacitor C 0 Voltage at both ends is V 0 Is equivalent to a memristor Rm 0 The potential of the negative terminal; the mathematical model obtained is:
Figure GDA0003853674280000041
wherein, I s N and V T Respectively representing the reverse saturation current, the emission coefficient and the thermal voltage of the diode,
Figure GDA0003853674280000042
from this, it can be deduced that the reactance expression of the memristor is:
Figure GDA0003853674280000043
the differential input operational circuit based on the memristor consists of three resistors, one memristor and an operational amplifier AThe negative input end of the operational amplifier A passes through a resistor R 1 Connected to the input of an inverter circuit via a memristor Rm 1 The output end and the negative input end of the operational amplifier A are connected, and the positive input end of the operational amplifier A passes through a resistor R 2 Connected with the input of a forward circuit, the positive input end of which passes through a resistor R 3 Grounded, negative input terminal U of operational amplifier A i1 The positive input end of the operational amplifier A is connected with U i2 (ii) a Negative power supply termination V of operational amplifier A 0 (ii) a Separately and independently acting according to the positive input and the negative input respectively to obtain the following relational expression:
set positive input U i2 Negative input U i1 ；
When the negative input acts alone
Figure GDA0003853674280000051
When the positive input is acted on alone
Figure GDA0003853674280000052
Obtaining an output:
Figure GDA0003853674280000053
the above is the embodiment of the present invention. The embodiments and specific parameters in the embodiments are only for the purpose of clearly illustrating the verification process of the invention and are not intended to limit the scope of the invention, which is defined by the claims, and all equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be covered by the scope of the present invention.

Claims (2)

1. A differential input circuit based on a memristor comprises a differential proportional amplifying circuit, and is characterized in that: the differential proportional amplifying circuit comprises two input ends and an output end, the output end and the two input ends of the differential proportional amplifying circuit are both connected with a memristor low-pass filter circuit, and input signals of the two input ends are signals with opposite polarities;
the differential proportional amplifying circuit comprises an operational amplifier A with a positive phase input end, an inverse phase input end and an output end, wherein the inverse phase input end of the operational amplifier A is connected with a memristor Rm 2 And a capacitor C 2 Composed memristive filter LB 2 The memristor Rm 2 Is passed through a resistor R 1 Connected with an inverting input signal source, the capacitor C 2 One end and the memristor Rm 2 Is connected to the output terminal of the capacitor C 2 The other end of the first and second electrodes is grounded; the positive phase input end of the operational amplifier A is connected with a memristor Rm 3 And a capacitor C 3 Composed memristive filter LB 3 The memristor Rm 3 Is passed through a resistor R 2 Connected with a positive phase input signal source, the capacitor C 3 One end of the memristor Rm 3 Is connected to the output terminal of the capacitor C 3 The other end of the first and second electrodes is grounded; the output end of the operational amplifier A and the memristor Rm 0 And a capacitor C 1 Composed memristive filter LB 1 Connected to the memristor Rm 0 Is connected with the output signal terminal of the operational amplifier A, and the capacitor C 1 And the memristor Rm 0 Is connected to the signal output terminal of the capacitor C 1 The left end of (2) is grounded; the memristive filter LB 1 As an output terminal of the differential input circuit; the positive phase input end of the operational amplifier A passes through a resistor R 3 A memristor Rm is connected between the inverting input end and the output end of the operational amplifier A in parallel 1 。
2. A memristor-based differential input circuit as defined in claim 1, wherein: the memristor Rm 1 Memristor Rm 2 Memristor Rm 3 And memristor Rm 0 All comprise a diode D 1 Diode D 2 Diode D 3 And a diode D 4 The electric bridge formed by end-to-end connection is connected with a capacitor C 0 And a resistance R 0 Are connected in parallel; the second mentionedPolar tube D 1 Diode D 2 Diode D 3 And a diode D 4 The function of a Venturi bridge is realized, and the capacitor and the resistor form an RC oscillating circuit;
the Venturi bridge is a diode D 4 Cathode and diode D 1 The crossing point of the anode connection is the input end, and the diode D 3 Cathode and diode D 2 The intersection point of the positive electrode connection is a single-input single-output circuit of the output end; diode D 4 Anode and diode D 3 Anode connected to diode D 1 Cathode and diode D 2 Is connected with the cathode; the capacitor C 0 The resistor R 0 Are all connected in parallel to the diode D 1 Cathode of and diode D 2 Point of intersection of negative electrode connections and diode D 4 Anode and diode D 3 Between the intersections of the positive connections.
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