CN217363030U - High-resistance input single-power-supply broadband amplifying circuit - Google Patents
High-resistance input single-power-supply broadband amplifying circuit Download PDFInfo
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- CN217363030U CN217363030U CN202122595871.0U CN202122595871U CN217363030U CN 217363030 U CN217363030 U CN 217363030U CN 202122595871 U CN202122595871 U CN 202122595871U CN 217363030 U CN217363030 U CN 217363030U
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Abstract
The utility model discloses a high-resistance input single-power-supply broadband amplifying circuit, which comprises a signal input end, a protection circuit, a first-stage amplifying circuit, a second-stage amplifying circuit, a high-pass filter circuit, a third-stage amplifying circuit, a fourth-stage amplifying circuit and a signal output circuit which are connected in sequence; the first-stage amplifying circuit is a field effect transistor amplifying circuit, the second-stage amplifying circuit and the third-stage amplifying circuit are both three-stage transistor amplifying circuits, the fourth-stage amplifying circuit is an operational amplifying circuit, the positive input end of the operational amplifying circuit is connected with the third-stage amplifying circuit through a voltage division circuit, and the output end of the operational amplifying circuit is connected with the signal output circuit. The high-resistance input single-power-supply broadband amplifying circuit adopting the structure adopts the single power supply to supply power, is convenient to use, adopts a multi-stage amplification mode, improves the amplification factor and has flexible amplification factor.
Description
Technical Field
The utility model belongs to the technical field of the signal processing technique and specifically relates to a high resistance input single power supply broadband amplifier circuit is related to.
Background
At present, in an electric power system, various signals are required to be acquired for monitoring the state of a system or equipment, the signals acquired by the existing sensor need to be processed by a subsequent circuit, and the existing signal amplification circuit generally adopts a dual-power supply mode, so that the subsequent use is inconvenient. Meanwhile, the flexibility of the amplification factor of the existing amplification circuit is poor, so that the existing amplification circuit cannot be applied to the existing signal processing circuit, and the design cost of the circuit is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high resistance input single power supply broadband amplifier circuit adopts single power supply, and convenient to use adopts multistage amplified mode, improves the magnification, and the magnification is nimble.
In order to achieve the above object, the present invention provides a high-impedance input single-power-supply broadband amplifying circuit, which comprises a signal input terminal, a protection circuit, a first-stage amplifying circuit, a second-stage amplifying circuit, a high-pass filter circuit, a third-stage amplifying circuit, a fourth-stage amplifying circuit and a signal output circuit, which are connected in sequence;
the first-stage amplifying circuit is a field effect transistor amplifying circuit, the second-stage amplifying circuit and the third-stage amplifying circuit are both three-stage transistor amplifying circuits, the fourth-stage amplifying circuit is an operational amplifying circuit, the positive input end of the operational amplifying circuit is connected with the third-stage amplifying circuit through a voltage division circuit, and the output end of the operational amplifying circuit is connected with the signal output circuit.
Preferably, the protection circuit comprises an overvoltage protection resistor and a protection diode, one end of the protection diode is grounded, the other end of the protection diode is connected with one end of the overvoltage protection resistor, and the other end of the overvoltage protection resistor is connected with the signal input end.
Preferably, the high-pass filter circuit comprises two capacitors connected in series and an inductor, one end of the inductor is connected between the two capacitors, and the other end of the inductor is grounded.
Preferably, the voltage dividing circuit includes two voltage dividing resistors connected in series, and a collector of the third-stage amplifying circuit and a positive input end of the operational amplifier amplifying circuit are both connected between the two voltage dividing resistors.
Preferably, the signal output circuit comprises an output protection resistor, an output coupling capacitor and an output inductor, one end of the output inductor is connected with the positive electrode, the other end of the output inductor is connected with one end of the output coupling capacitor, the other end of the output coupling capacitor is connected with one end of the output protection resistor, and the other end of the output protection resistor is connected with the output end of the operational amplifier circuit.
Preferably, the operational amplifier circuit and the second-stage amplifier circuit are both connected with a decoupling capacitor.
Therefore, the utility model adopts the above structure a high resistance input single power supply broadband amplifier circuit has following beneficial effect:
(1) the positive input end of the operational amplifier circuit is connected with the third-stage amplifier circuit through a voltage division circuit, and the output end of the operational amplifier circuit is connected with the signal output circuit, so that power supply of a single power supply is realized, and subsequent connection is facilitated.
(2) The multistage amplification is realized through the first-stage amplification circuit, the second-stage amplification circuit, the third-stage amplification circuit and the fourth-stage amplification circuit, the amplification factor is improved, the amplification factor of each stage is changed according to actual requirements, the adjustment of the whole amplification factor is realized, and the amplification factor is flexible.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic diagram of the high-resistance input single-power-supply broadband amplifying circuit of the present invention.
Detailed Description
Examples
Fig. 1 is the utility model relates to a high resistance input single power supply broadband amplifier circuit schematic diagram, as shown in the figure, a high resistance input single power supply broadband amplifier circuit, including signal input part, protection circuit, first order amplifier circuit, second level amplifier circuit, high pass filter circuit, third level amplifier circuit, fourth level amplifier circuit and the signal output circuit who connects gradually.
The signal input end is connected with a protection circuit, the protection circuit comprises an overvoltage protection resistor R2 and a protection diode D2, one end of the protection diode D2 is grounded, and the protection diode is used for protecting a subsequent circuit from damage of reverse voltage current. The other end of the protection diode D2 is connected with one end of an overvoltage protection resistor R2, the other end of the overvoltage protection resistor R2 is connected with a signal input end, and the overvoltage protection resistor R2 avoids the damage of a subsequent circuit caused by overlarge signal voltage.
The first-stage amplifying circuit is a field effect transistor amplifying circuit, and the field effect transistor Q1 has the advantages of high input impedance, low output impedance, low noise, low power consumption and the like. The second-stage amplifying circuit and the third-stage amplifying circuit are both triode amplifying circuits, the high-pass filter circuit comprises two capacitors (C7 and C11) which are connected in series and an inductor L2, one end of the inductor L2 is connected between the two capacitors, and the other end of the inductor L2 is grounded.
The fourth-stage amplifying circuit is an operational amplifying circuit, the positive input end of the operational amplifying circuit is connected with the third-stage amplifying circuit through a voltage dividing circuit, the voltage dividing circuit comprises two voltage dividing resistors (R15 and R17) which are connected in series, and the collector electrode of the third-stage amplifying circuit and the positive input end of the operational amplifying circuit are both connected between the two voltage dividing resistors, so that power supply of a single power supply is realized, and subsequent connection is facilitated. The output end of the operational amplifier circuit is connected with the signal output circuit. The signal output circuit comprises an output protection resistor R19, an output coupling capacitor C12 and an output inductor L3, one end of the output inductor L3 is connected with the positive electrode, the other end of the output inductor L3 is connected with one end of the output coupling capacitor C12, the other end of the output coupling capacitor C12 is connected with one end of the output protection resistor R19, and the other end of the output protection resistor R19 is connected with the output end of the operational amplifier amplifying circuit.
The operational amplifier circuit and the second-stage amplifier circuit are both connected with decoupling capacitors (C5 and C15) to prevent the influence of current fluctuation formed in the power supply circuit on the normal operation of the circuits when the current of the front and rear circuits changes, and the parasitic coupling between the circuits is eliminated.
Therefore, the utility model adopts the above structure a high resistance input single power supply broadband amplifier circuit adopts single power supply, and convenient to use adopts multistage enlarged mode, improves the magnification, and the magnification is nimble.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the technical solution of the present invention can still be modified or replaced by other equivalent means, and the modified technical solution can not be separated from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. A high-resistance input single-power-supply broadband amplifying circuit is characterized in that: the protection circuit comprises a signal input end, a protection circuit, a first-stage amplification circuit, a second-stage amplification circuit, a high-pass filter circuit, a third-stage amplification circuit, a fourth-stage amplification circuit and a signal output circuit which are connected in sequence;
the first-stage amplifying circuit is a field effect transistor amplifying circuit, the second-stage amplifying circuit and the third-stage amplifying circuit are both three-stage transistor amplifying circuits, the fourth-stage amplifying circuit is an operational amplifying circuit, the positive input end of the operational amplifying circuit is connected with the third-stage amplifying circuit through a voltage division circuit, and the output end of the operational amplifying circuit is connected with the signal output circuit.
2. The high-impedance input single-power-supply wide-band amplifier circuit according to claim 1, wherein: the protection circuit comprises an overvoltage protection resistor and a protection diode, one end of the protection diode is grounded, the other end of the protection diode is connected with one end of the overvoltage protection resistor, and the other end of the overvoltage protection resistor is connected with a signal input end.
3. The high-resistance input single-power-supply broadband amplification circuit according to claim 1, characterized in that: the high-pass filter circuit comprises two capacitors and an inductor which are connected in series, one end of the inductor is connected between the two capacitors, and the other end of the inductor is grounded.
4. The high-impedance input single-power-supply wide-band amplifier circuit according to claim 1, wherein: the voltage division circuit comprises two voltage division resistors connected in series, and a collector of the third-stage amplification circuit and a forward input end of the operational amplification circuit are connected between the two voltage division resistors.
5. The high-impedance input single-power-supply wide-band amplifier circuit according to claim 1, wherein: the signal output circuit comprises an output protection resistor, an output coupling capacitor and an output inductor, one end of the output inductor is connected with the positive electrode, the other end of the output inductor is connected with one end of the output coupling capacitor, the other end of the output coupling capacitor is connected with one end of the output protection resistor, and the other end of the output protection resistor is connected with the output end of the operational amplifier circuit.
6. The high-impedance input single-power-supply wide-band amplifier circuit according to claim 1, wherein: the operational amplifier amplifying circuit and the second-stage amplifying circuit are both connected with decoupling capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122595871.0U CN217363030U (en) | 2021-10-27 | 2021-10-27 | High-resistance input single-power-supply broadband amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122595871.0U CN217363030U (en) | 2021-10-27 | 2021-10-27 | High-resistance input single-power-supply broadband amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217363030U true CN217363030U (en) | 2022-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122595871.0U Active CN217363030U (en) | 2021-10-27 | 2021-10-27 | High-resistance input single-power-supply broadband amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217363030U (en) |
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2021
- 2021-10-27 CN CN202122595871.0U patent/CN217363030U/en active Active
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