Circuit system for realizing small signal conversion processing

Abstract

The invention relates to a circuit system for realizing small signal conversion processing, which comprises a blocking capacitor, a large-resistance resistor and a phase inverter, the blocking capacitor is connected with the input end of the phase inverter, the large-resistance resistor is connected in parallel between the input end and the output end of the phase inverter, and the output end of the phase inverter outputs square wave signals. The circuit system for achieving small signal conversion processing has a simple topological structure, the number of used devices is small, signal processing devices such as operational amplifiers or triodes and additional circuits do not need to be used, cost is greatly reduced, the circuit system has the advantage of being easy to integrate, and integration is easy and convenient due to the fact that the circuit area is extremely small. The circuit is simple and practical in structure, and the design cost and the implementation area are effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical design, in particular to the field of signal processing circuit, and more particularly to a circuit system for realizing small signal conversion processing. BACKGROUND

[0002] Most signals in real life are analog signals. In order to process these signals digitally, the analog signals must be converted into digital signals, and then into data streams for digital filtering, spectral analysis and other digital processing. The signal generated by the transmitting end circuit in the digital circuit system is very weak after transmission, and its amplitude may not reach the threshold requirement of the receiving logic gate circuit, so it cannot be recognized by the logic gate circuit. After processing, a square wave signal with an amplitude meeting the requirement can be generated for subsequent processing.

[0003] In signal processing, the processing circuit for small signals often uses a circuit composed of operational amplifiers or transistors. The use of operational amplifiers or transistor amplification circuits for processing may cause delay and high power consumption. These circuits have high cost or are complex to implement, and there are problems such as signal distortion, which have certain limitations. SUMMARY

[0004] The present application overcomes the shortcomings of the prior art and provides a circuit system for realizing small signal conversion processing, which is simple, low in cost and widely applicable.

[0005] To achieve the above purpose, the circuit system for realizing small signal conversion processing of the present application is as follows:

[0006] The circuit system for realizing small signal conversion processing mainly comprises a blocking capacitor, a high-resistance resistor and an inverter. The blocking capacitor is connected to the input end of the inverter. The high-resistance resistor is connected in parallel between the input end and the output end of the inverter. The output end of the inverter outputs a square wave signal.

[0007] Preferably, the system further comprises an inductor, a second resistor and a grounding capacitor. One end of the inductor is connected to one end of the second resistor. The other end of the inductor is connected to a 5V power supply. The other end of the second resistor is connected to the power supply pin of the inverter. One end of the grounding capacitor is connected to the power supply pin of the inverter, and the other end of the grounding capacitor is grounded.

[0008] Preferably, the capacitance of the blocking capacitor is 10nF, and the resistance of the high-resistance resistor is 120kΩ.

[0009] Preferably, the model of the inverter is 74LVC2G04.

[0010] The circuit system for realizing small signal conversion processing of the present application has simple topological structure, and uses very few devices, without using signal processing devices such as operational amplifier or triode and additional circuit, greatly reducing cost, and having the characteristics of easy integration, and extremely small circuit area for realizing simple and convenient integration. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The circuit schematic diagram of the circuit system for realizing small signal conversion processing of the present application.

[0012] Figure 2 The circuit schematic diagram of the circuit system for realizing small signal conversion processing of the present application. DETAILED DESCRIPTION

[0013] In order to more clearly describe the technical content of the present application, further description will be made in combination with specific embodiments.

[0014] The circuit system for realizing small signal conversion processing of the present application, wherein the direct current blocking capacitor is connected with the input end of the inverter, the high resistance resistor is connected in parallel between the input end and the output end of the inverter, and the output end of the inverter outputs square wave signal.

[0015] As the preferred embodiment of the present application, the system further comprises inductor, second resistor and grounding capacitor, one end of the inductor and one end of the second resistor are connected, the other end of the inductor is connected with 5V power supply, the other end of the second resistor is connected with the power supply pin of the inverter, one end of the grounding capacitor is connected with the power supply pin of the inverter, and the other end of the grounding capacitor is grounded.

[0016] As the preferred embodiment of the present application, the capacitance value of the direct current blocking capacitor is 10nF, and the resistance value of the high resistance resistor is 120kΩ.

[0017] As the preferred embodiment of the present application, the model of the inverter is 74LVC2G04.

[0018] In the specific embodiment of the present application, aiming at the problem of small signal processing circuit, the present application proposes a small signal conversion processing circuit with simple circuit and low cost.

[0019] The small signal processing circuit of the present application comprises the following steps:

[0020] The small signal processing circuit of the present application is as shown in the accompanying drawings. Figure 1As shown, including a DC blocking capacitor, a large resistance, NAND (inverter) composition; small signal through a DC blocking capacitor, into the inverter input, inverter input and output between a large resistance parallel, signal from the inverter output end output final square wave signal. Small signal through the circuit structure will produce a stable square wave signal for subsequent signal processing.

[0021] The circuit structure of the application is composed of a DC blocking capacitor, a large resistance and a NAND, which is not a complex circuit structure, only embodies the conversion function from a small signal to a square wave signal, and the processing circuit of the square wave signal is determined according to the actual situation.

[0022] The schematic diagram is as shown in Figure 1 The small signal is input from the input pin of the inverter 74LVC2G04 chip 1 port through the DC blocking capacitor C1, a large resistance R1 is connected between the input pin 1 and the output pin 6 of the inverter chip, the power supply pin 5 of the chip is connected to a 5V power supply through an inductor L1, a second resistor R2 and a grounding capacitor C2, and the small signal after conversion is output from the output pin 6 of the chip as a square wave signal.

[0023] After a series of processing of the input signal, the signal frequency received by the receiving end is 5MHz, the peak-to-peak value is 264mv, the signal amplitude is too low, the signal has been attenuated to not meet the amplitude requirement of the subsequent gate circuit, at this time the signal needs to be converted to a square wave signal after amplification processing and can be processed by the subsequent circuit, and the amplification multiple of the specific frequency signal and a series of parameters need to be debugged by using the operational amplifier or the triode, which needs a certain test time and cost, and the result has the problems of time delay and large power consumption, while the processing circuit designed in the application only needs a NAND and a resistor capacitor to realize the processing of the small signal, the small signal passes through the circuit, and can be converted into a square wave signal which can be processed by the subsequent circuit, and the square wave signal output after passing through the circuit is a 5MHz square wave signal with a peak-to-peak value of 5V, which can reach the square wave signal threshold requirement of the subsequent gate circuit.

[0024] The small signal processing circuit is as shown in Figure 2 As shown, including a DC blocking capacitor, a large resistance, NAND (inverter) composition; small signal source in series with a 10nF DC blocking capacitor C1, and then in series with the input end of the inverter U1, a 120k large resistance R1 is connected between the input end and the output end of the inverter U1, and the final square wave signal is output from the output end of the inverter U1,

[0025] Figure 2 It is a circuit structure used in practical application, the NAND is selected from 74LVC2G04, and the above test results are obtained by testing the circuit.

[0026] The circuit structure described in the application is to convert small signal into processable square wave signal by using capacitor resistance and inverter, and the innovation of the application is that it does not use the traditional three-stage tube and other single-chip circuit structures, that is, there is no delay and large power consumption problem that may occur in the three-stage tube circuit, and the problems such as high circuit cost and the possibility of distortion of complex signals are avoided.

[0027] The circuit design of the application is different from the commonly used small signal amplification circuit structure, and does not use a transistor or other single-chip microcomputer and complex circuit structure. In the selection of the chip, the circuit of the application only selects an inverter chip, and only needs a DC blocking capacitor and a large resistor in the circuit structure except the power supply, which is different from the circuit structure in the second comparative document, and the circuit structure is simpler, can save cost, and is easier to realize integration.

[0028] The specific implementation scheme of the embodiment can be referred to the related description in the above embodiment, which will not be repeated here.

[0029] It can be understood that the same or similar parts in the above embodiments can be mutually referred to, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0030] It should be noted that in the description of the application, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, in the description of the application, unless otherwise specified, "a plurality of" means at least two.

[0031] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application. In the description of the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The circuit system for converting and processing small signal by using the application has a simple topology structure, and the number of devices used is very small, without using signal processing devices such as operational amplifier or triode and additional circuit, which greatly reduces the cost and has the characteristics of easy integration, and realizes simple and convenient integration with very small circuit area. The circuit structure is simple and practical, which effectively reduces the design cost and implementation area.

[0033] In this specification, the application has been described with reference to specific embodiments thereof. It is apparent, however, that various modifications and changes can be made thereto without departing from the spirit and scope of the application. Therefore, the description and drawings should be regarded in an illustrative rather than a restrictive sense.

Claims

1. Circuitry implementing small signal conversion processing, characterized by, The system comprises a blocking capacitor, a high resistance resistor and an inverter, the blocking capacitor is connected with the input end of the inverter, the high resistance resistor is connected in parallel between the input end and the output end of the inverter, and the output end of the inverter outputs a square wave signal.

2. The circuitry implementing small signal conversion processing according to claim 1, wherein, The system further comprises an inductor, a second resistor and a grounding capacitor, one end of the inductor and one end of the second resistor are connected, the other end of the inductor is connected with a 5V power supply, the other end of the second resistor is connected with a power supply pin of the inverter, one end of the grounding capacitor is connected with the power supply pin of the inverter, and the other end of the grounding capacitor is grounded.

3. The circuitry implementing small signal conversion processing according to claim 1, wherein, The capacitance of the blocking capacitor is 10nF, and the resistance of the high resistance resistor is 120kΩ.

4. The circuitry implementing small signal conversion processing according to claim 1, wherein, The model of the inverter is 74LVC2G04.

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