CN216252677U - Differential amplification circuit - Google Patents
Differential amplification circuit Download PDFInfo
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- CN216252677U CN216252677U CN202122820599.1U CN202122820599U CN216252677U CN 216252677 U CN216252677 U CN 216252677U CN 202122820599 U CN202122820599 U CN 202122820599U CN 216252677 U CN216252677 U CN 216252677U
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- 230000003321 amplification Effects 0.000 title claims abstract description 26
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 89
- 239000011324 bead Substances 0.000 claims description 42
- 230000001052 transient effect Effects 0.000 claims description 18
- 102100031650 C-X-C chemokine receptor type 4 Human genes 0.000 claims description 9
- 101000922348 Homo sapiens C-X-C chemokine receptor type 4 Proteins 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 2
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- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a differential amplification circuit, which comprises a filtering unit, a voltage stabilizing unit and a signal amplification unit, wherein the filtering unit, the voltage stabilizing unit and the signal amplification unit are sequentially connected, and the filtering unit receives a signal of a current sensor; the utility model has the advantages that: and weak signals are amplified, so that signal acquisition is facilitated.
Description
Technical Field
The utility model relates to the field of signal processing, in particular to a differential amplification circuit.
Background
The differential amplifier circuit is also called as a differential amplifier circuit, and when the voltages at two input ends of the differential amplifier circuit are different, the output voltage changes, so the differential amplifier circuit is called as a differential. The differential amplifying circuit is evolved from an amplifying circuit with stable static operating point. When signal acquisition is carried out, weak signals are difficult to acquire without amplification, so that the differential amplification circuit is necessary to be designed.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the present invention is to provide a differential amplifier circuit to amplify weak signals, which is convenient for signal acquisition.
The utility model solves the technical problems through the following technical means: the differential amplification circuit comprises a filtering unit, a voltage stabilizing unit and a signal amplification unit, wherein the filtering unit, the voltage stabilizing unit and the signal amplification unit are sequentially connected, and the filtering unit receives signals of a current sensor.
The utility model provides a differential amplification circuit, wherein the input end of the differential amplification circuit receives a signal of a current sensor, and the signal is amplified and output after passing through a filtering unit, a voltage stabilizing unit and a signal amplification unit, so that a weak signal is amplified, and the signal acquisition is facilitated.
Further, the filtering unit includes a common mode inductor L-COM7, a magnetic bead FB27, and a magnetic bead FB28, a first end and a fourth end of the common mode inductor L-COM7 receive signals of the current sensor, one end of the magnetic bead FB27 is connected to the fourth end of the common mode inductor L-COM7, the other end of the magnetic bead FB27 is connected to the third end of the common mode inductor L-COM7, one end of the magnetic bead FB28 is connected to the first end of the common mode inductor L-COM7, and the other end of the magnetic bead FB28 is connected to the second end of the common mode inductor L-COM 7.
Furthermore, the voltage stabilizing unit comprises a transient diode TVS14, a transient diode TVS15, a resistor R191, a resistor R193, a resistor R192, a diode D19 and a diode D15, the third terminal of the common-mode inductor L-COM7, one terminal of the transient diode TVS14 and one terminal of the resistor R191 are connected, the second terminal of the common-mode inductor L-COM7, one terminal of the transient diode TVS15 and one terminal of the resistor R193 are connected, and the other terminal of the transient diode TVS14 and the other terminal of the transient diode TVS15 are grounded; the other end of the resistor R191, the cathode of the diode D19, and the anode of the diode D15 are connected, the anode of the diode D19, the other end of the resistor R193, one end of the resistor R192, and the cathode of the diode D15 are connected, and the other end of the resistor R192 is grounded.
Furthermore, the signal amplification unit comprises a capacitor C256, a chip U36, a resistor R165, a resistor R173, a capacitor C242, a resistor R137, a capacitor C75, and a resistor R143, wherein an anode of the diode D15, a second pin of the chip U36, one end of the resistor R137, and one end of the resistor R143 are connected, a cathode of the diode D15 is connected with a third pin of the chip U36, a fourth pin of the chip U36 and one end of the capacitor C256 are connected with the power supply VN8P _ AV in parallel, and the other end of the capacitor C256 is grounded; the other end of the resistor R143 is connected with one end of a capacitor C75, the other end of the capacitor C75, the other end of the resistor R137 and a sixth pin of a chip U36 are connected and used as a signal output port, one end of the capacitor C242, one end of the resistor R173, one end of the resistor R165 and a seventh pin of the chip U36 are connected and connected with a power supply V8P _ AV, the other end of the resistor R165 is connected with an eighth pin of the chip U36, and the other end of the resistor R173 is connected with a first pin of the chip U36.
Furthermore, the current sensor is connected with a current sensor power supply circuit, the current sensor power supply circuit comprises a magnetic bead FB21, a capacitor C88-C93, a resistor R258, a capacitor C275, a chip U38, an inductor L5, a diode D29, a resistor R197, a resistor R198, a magnetic bead FB22, a capacitor C96 and a capacitor C278, the model of the chip U38 is TPS61170DRV, one end of the magnetic bead FB21 and one end of the capacitor C90 are connected with a power supply V5P _ VDD in parallel, the other end of the magnetic bead FB21, one end of the capacitor C88, one end of the capacitor C89, a sixth pin of the chip U38, a fifth pin of the chip U38 and one end of the inductor L5 are connected, and the other end of the capacitor C90, the other end of the capacitor C88 and the other end of the capacitor C89 are grounded; one end of the resistor R258 is connected with a second pin of the chip U38, and the other end of the resistor R258 is grounded through the capacitor C275; the other end of the inductor L5, the anode of the diode D29 and the fourth pin of the chip U38 are connected, the cathode of the diode D29, one end of the resistor R198, one end of the capacitor C92, one end of the capacitor C91 and one end of the magnetic bead FB22 are connected, the other end of the resistor R198, the first pin of the chip U38 and one end of the resistor R197 are connected, the other end of the resistor R197, the other end of the capacitor C92 and the other end of the capacitor C91 are connected and grounded, the other end of the magnetic bead FB22, one end of the capacitor C96, one end of the capacitor C278 and one end of the capacitor C93 are connected and serve as a power output interface CT _ VDD, and the other end of the capacitor C96, the other end of the capacitor C278 and the other end of the capacitor C93 are connected and grounded.
Further, the model of the chip U36 is OP07 CSZ.
Furthermore, the model of the common mode inductor L-COM7 is DLW5BSM501TQ 2.
The utility model has the advantages that: the utility model provides a differential amplification circuit, wherein the input end of the differential amplification circuit receives a signal of a current sensor, and the signal is amplified and output after passing through a filtering unit, a voltage stabilizing unit and a signal amplification unit, so that a weak signal is amplified, and the signal acquisition is facilitated.
Drawings
FIG. 1 is a schematic diagram of a differential amplifier circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power supply circuit of a current sensor in a differential amplifier circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a differential amplification circuit includes a filtering unit, a voltage stabilizing unit and a signal amplifying unit, wherein the filtering unit, the voltage stabilizing unit and the signal amplifying unit are connected in sequence, and the filtering unit receives a signal of a current sensor. The filter unit comprises a common-mode inductor L-COM7, a magnetic bead FB27 and a magnetic bead FB28, the voltage stabilizing unit comprises a transient diode TVS14, a transient diode TVS15, a resistor R191, a resistor R193, a resistor R192, a diode D19 and a diode D15, and the signal amplifying unit comprises a capacitor C256, a chip U36, a resistor R165, a resistor R173, a capacitor C242, a resistor R137, a capacitor C75 and a resistor R143. The model of the chip U36 is OP07CSZ, and the model of the common mode inductor L-COM7 is DLW5BSM501TQ 2. The common-mode inductor L-COM7 and the magnetic bead FB27 and the magnetic bead FB28 belong to compatible design, the common-mode inductor L-COM7 or the magnetic bead FB27 and the magnetic bead FB28 are adopted in practical application, and the magnetic bead FB27 and the magnetic bead FB28 are adopted in the utility model.
The first end and the fourth end of the common-mode inductor L-COM7 receive signals of the current sensor 10, one end of a magnetic bead FB27 is connected with the fourth end of the common-mode inductor L-COM7, the other end of the magnetic bead FB27, the third end of the common-mode inductor L-COM7, one end of the transient diode TVS14 and one end of the resistor R191 are connected, one end of the magnetic bead FB28 is connected with the first end of the common-mode inductor L-COM7, the other end of the magnetic bead FB28, the second end of the common-mode inductor L-COM7, one end of the transient diode TVS15 and one end of the resistor R193 are connected, and the other end of the transient diode TVS14 and the other end of the transient diode TVS15 are grounded; the other end of the resistor R191, the cathode of the diode D19, the anode of the diode D15, the second pin of the chip U36, one end of the resistor R137 and one end of the resistor R143 are connected, the anode of the diode D19, the other end of the resistor R193, one end of the resistor R192, the cathode of the diode D15 and the third pin of the chip U36 are connected, and the other end of the resistor R192 is grounded; a fourth pin of the chip U36 is connected with one end of the capacitor C256 and connected with the power supply VN8P _ AV, and the other end of the capacitor C256 is grounded; the other end of the resistor R143 is connected with one end of a capacitor C75, the other end of the capacitor C75, the other end of the resistor R137 and a sixth pin of a chip U36 are connected and used as a signal output port, one end of the capacitor C242, one end of the resistor R173, one end of the resistor R165 and a seventh pin of the chip U36 are connected and connected with a power supply V8P _ AV, the other end of the resistor R165 is connected with an eighth pin of the chip U36, and the other end of the resistor R173 is connected with a first pin of the chip U36.
As shown in fig. 2, the current sensor is connected to a current sensor power supply circuit, the current sensor power supply circuit includes a magnetic bead FB21, a capacitor C88 to a capacitor C93, a resistor R258, a capacitor C275, a chip U38, an inductor L5, a diode D29, a resistor R197, a resistor R198, a magnetic bead FB22, a capacitor C96, and a capacitor C278, the model of the chip U38 is TPS61170DRV, one end of the magnetic bead FB21 and one end of the capacitor C90 are connected to and connected to a power supply V5P _ VDD, the other end of the magnetic bead FB21, one end of the capacitor C88, one end of the capacitor C89, a sixth pin of the chip U38, a fifth pin of the chip U38, and one end of the inductor L5 are connected, and the other end of the capacitor C90, the other end of the capacitor C88, and the other end of the capacitor C89 are grounded; one end of the resistor R258 is connected with a second pin of the chip U38, and the other end of the resistor R258 is grounded through the capacitor C275; the other end of the inductor L5, the anode of the diode D29 and the fourth pin of the chip U38 are connected, the cathode of the diode D29, one end of the resistor R198, one end of the capacitor C92, one end of the capacitor C91 and one end of the magnetic bead FB22 are connected, the other end of the resistor R198, the first pin of the chip U38 and one end of the resistor R197 are connected, the other end of the resistor R197, the other end of the capacitor C92 and the other end of the capacitor C91 are connected and grounded, the other end of the magnetic bead FB22, one end of the capacitor C96, one end of the capacitor C278 and one end of the capacitor C93 are connected and serve as a power output interface CT _ VDD, and the other end of the capacitor C96, the other end of the capacitor C278 and the other end of the capacitor C93 are connected and grounded.
According to the technical scheme, the input end of the differential amplification circuit receives the signal of the current sensor, and the signal is amplified and output after passing through the filtering unit, the voltage stabilizing unit and the signal amplification unit, so that a weak signal is amplified, and signal acquisition is facilitated.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The differential amplification circuit is characterized by comprising a filtering unit, a voltage stabilizing unit and a signal amplification unit, wherein the filtering unit, the voltage stabilizing unit and the signal amplification unit are sequentially connected, and the filtering unit receives signals of a current sensor.
2. The differential amplifier circuit according to claim 1, wherein the filter unit comprises a common-mode inductor L-COM7, a magnetic bead FB27, and a magnetic bead FB28, a first end and a fourth end of the common-mode inductor L-COM7 receive signals of the current sensor, one end of the magnetic bead FB27 is connected to the fourth end of the common-mode inductor L-COM7, the other end of the magnetic bead FB27 is connected to the third end of the common-mode inductor L-COM7, one end of the magnetic bead FB28 is connected to the first end of the common-mode inductor L-COM7, and the other end of the magnetic bead FB28 is connected to the second end of the common-mode inductor L-COM 7.
3. The differential amplifier circuit according to claim 2, wherein the voltage regulator unit comprises a transient diode TVS14, a transient diode TVS15, a resistor R191, a resistor R193, a resistor R192, a diode D19 and a diode D15, the third terminal of the common-mode inductor L-COM7, one terminal of the transient diode TVS14 and one terminal of the resistor R191 are connected, the second terminal of the common-mode inductor L-COM7, one terminal of the transient diode TVS15 and one terminal of the resistor R193 are connected, and the other terminal of the transient diode TVS14 and the other terminal of the transient diode TVS15 are grounded; the other end of the resistor R191, the cathode of the diode D19, and the anode of the diode D15 are connected, the anode of the diode D19, the other end of the resistor R193, one end of the resistor R192, and the cathode of the diode D15 are connected, and the other end of the resistor R192 is grounded.
4. The differential amplifier circuit according to claim 3, wherein the signal amplifying unit comprises a capacitor C256, a chip U36, a resistor R165, a resistor R173, a capacitor C242, a resistor R137, a capacitor C75 and a resistor R143, wherein the anode of the diode D15, the second pin of the chip U36, one end of the resistor R137 and one end of the resistor R143 are connected, the cathode of the diode D15 is connected with the third pin of the chip U36, the fourth pin of the chip U36 and one end of the capacitor C256 are connected and connected with the power supply VN8P _ AV, and the other end of the capacitor C256 is grounded; the other end of the resistor R143 is connected with one end of a capacitor C75, the other end of the capacitor C75, the other end of the resistor R137 and a sixth pin of a chip U36 are connected and used as a signal output port, one end of the capacitor C242, one end of the resistor R173, one end of the resistor R165 and a seventh pin of the chip U36 are connected and connected with a power supply V8P _ AV, the other end of the resistor R165 is connected with an eighth pin of the chip U36, and the other end of the resistor R173 is connected with a first pin of the chip U36.
5. The differential amplification circuit of claim 4, wherein the current sensor is connected with a current sensor power supply circuit, the current sensor power supply circuit comprises a magnetic bead FB21, a capacitor C88 to a capacitor C93, a resistor R258, a capacitor C275, a chip U38, an inductor L5, a diode D29, a resistor R197, a resistor R198, a magnetic bead FB22, a capacitor C96 and a capacitor C278, the model of the chip U38 is TPS61170DRV, one end of the magnetic bead 21 and one end of the capacitor C90 are connected with a power supply V5P _ VDD, the other end of the magnetic bead FB21, one end of the capacitor C88, one end of the capacitor C89, a sixth pin of the chip U38, a fifth pin of the chip U38 and one end of the inductor L5 are connected, and the other end of the capacitor C90, the other end of the capacitor C88 and the other end of the capacitor C89 are grounded; one end of the resistor R258 is connected with a second pin of the chip U38, and the other end of the resistor R258 is grounded through the capacitor C275; the other end of the inductor L5, the anode of the diode D29 and the fourth pin of the chip U38 are connected, the cathode of the diode D29, one end of the resistor R198, one end of the capacitor C92, one end of the capacitor C91 and one end of the magnetic bead FB22 are connected, the other end of the resistor R198, the first pin of the chip U38 and one end of the resistor R197 are connected, the other end of the resistor R197, the other end of the capacitor C92 and the other end of the capacitor C91 are connected and grounded, the other end of the magnetic bead FB22, one end of the capacitor C96, one end of the capacitor C278 and one end of the capacitor C93 are connected and serve as a power output interface CT _ VDD, and the other end of the capacitor C96, the other end of the capacitor C278 and the other end of the capacitor C93 are connected and grounded.
6. The differential amplifier circuit as claimed in claim 5, wherein the chip U36 has a model number OP07 CSZ.
7. The differential amplification circuit of claim 5, wherein the common mode inductor L-COM7 is model DLW5BSM501TQ 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122820599.1U CN216252677U (en) | 2021-11-17 | 2021-11-17 | Differential amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122820599.1U CN216252677U (en) | 2021-11-17 | 2021-11-17 | Differential amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216252677U true CN216252677U (en) | 2022-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122820599.1U Withdrawn - After Issue CN216252677U (en) | 2021-11-17 | 2021-11-17 | Differential amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216252677U (en) |
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2021
- 2021-11-17 CN CN202122820599.1U patent/CN216252677U/en not_active Withdrawn - After Issue
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