CN210075178U - Low-power consumption active filtering amplifying device - Google Patents
Low-power consumption active filtering amplifying device Download PDFInfo
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- CN210075178U CN210075178U CN201920938661.7U CN201920938661U CN210075178U CN 210075178 U CN210075178 U CN 210075178U CN 201920938661 U CN201920938661 U CN 201920938661U CN 210075178 U CN210075178 U CN 210075178U
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Abstract
The utility model discloses a low-power consumption active filtering amplifying device, which comprises a differential filtering amplifying unit and a bias current source unit; the bias current source unit comprises a trigger signal end, a first capacitor, a second capacitor and a first resistor, wherein the trigger signal end is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the second capacitor and one end of the first resistor, the other end of the second capacitor is connected to a first node, and the first node is connected to the differential filtering amplification unit. The utility model discloses a trigger signal drive, simple structure, the stable performance, the consumption of amplification unit is zero and the consumption is extremely low when the developments when static, and the amplification unit is fast to trigger signal's response speed, can catch input signal in real time.
Description
Technical Field
The utility model relates to a filtering and enlarge technical field, more specifically say, relate to a low-power consumption active filtering amplification device.
Background
A terminal node of the narrowband internet of things often needs to use a sensor to sense and detect the change of the environment, and the sensor of the analog output usually needs to use an amplifier and a filter to condition signals and drive an analog input port of an ADC, so that the fidelity of sampled signals is ensured. However, due to the limitation of battery capacity, the narrow-band internet of things terminal node has very strict limitation on the power consumption of each component. The power consumption of the amplifier is usually large, the delay of each start is obvious, and the burst signal is difficult to capture while the low power consumption is ensured.
SUMMERY OF THE UTILITY MODEL
The utility model provides a low-power consumption active filtering amplification device, amplifier consumption is all bigger among the solution prior art, and it is obvious to start delay at every turn, is difficult to catch burst signal's problem when guaranteeing the low-power consumption.
The utility model provides a low power consumption active filtering amplifying device, which comprises a differential filtering amplifying unit and a bias current source unit;
the bias current source unit comprises a trigger signal end, a first capacitor, a second capacitor and a first resistor, wherein the trigger signal end is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the second capacitor and one end of the first resistor, the other end of the second capacitor is connected to a first node, and the first node is connected to the differential filtering amplification unit; and the trigger signal end is connected with a square wave signal to drive the differential filtering amplification unit to capture the signal.
In the low power consumption active filtering amplifying device, the bias current source unit further includes a second resistor, one end of the second resistor is connected to the first node, and the other end of the second resistor is connected to the differential filtering amplifying unit.
In the low power consumption active filter amplifying device of the present invention, the bias current source unit further includes a third resistor, and one end of the third resistor is connected to the first node.
In the low power consumption active filter amplifier device of the present invention, the differential filter amplifier unit comprises a first differential input terminal, a second differential input terminal, a first differential output terminal, a second differential output terminal, a first filter unit, a second filter unit, a third filter unit, a fourth filter unit, a first amplifier unit and a second amplifier unit, wherein a first end of the first amplifier unit is connected to the first differential input terminal through the first filter unit, a second end of the first amplifier unit is connected to the second node, a third end of the first amplifier unit is connected to the third node and one end of the second filter unit, the other end of the second filter unit is connected to the first differential output terminal, a first end of the second amplifier unit is connected to the second differential input terminal through the third filter unit, and a second end of the second amplifier unit is connected to the second node, the third end of the second amplifying unit is connected to a third node and one end of the fourth filtering unit, the other end of the fourth filtering unit is connected to the second differential output end, and the second node is connected to the other end of the second resistor.
In the low power consumption active filtering amplifying device of the present invention, the first filtering unit includes a first inductor and a fourth resistor, one end of the first inductor is connected to the first differential input terminal, and a first end of the first amplifying unit is connected to the other end of the first inductor and one end of the fourth resistor;
the second filtering unit comprises a second inductor and a third capacitor, one end of the second inductor is connected to the third end of the first amplifying unit, and the other end of the second inductor is connected to one end of the third capacitor and the first differential output end;
the third filtering unit comprises a third inductor and a fifth resistor, one end of the third inductor is connected to the second differential input end, and the first end of the second amplifying unit is connected to the other end of the third inductor and one end of the fifth resistor;
the fourth filtering unit comprises a fourth inductor and a fourth capacitor, one end of the second inductor is connected to the third end of the first amplifying unit, and the other end of the second inductor is connected to one end of the third capacitor and the first differential output end.
In the low power consumption active filtering amplifying device of the present invention, the differential filtering amplifying unit further includes a sixth resistor and a seventh resistor;
the sixth resistor is connected between the second end of the first amplification unit and the second node, and the seventh resistor is connected between the second end of the second amplification unit and the second node.
In the low power consumption active filtering amplifying device of the present invention, the differential filtering amplifying unit further includes an eighth resistor and a ninth resistor;
the eighth resistor is connected between the third end of the first amplifying unit and the third node, and the ninth resistor is connected between the third end of the second amplifying unit and the third node.
In the low power consumption active power filter amplifying device, the third node is connected to a predetermined voltage, and the other end of the third resistor is connected to a predetermined reference ground.
In the low power consumption active power filter amplifying device of the present invention, the third node is connected to a predetermined reference ground, and the other end of the third resistor is connected to a predetermined voltage.
In the low power consumption active power filter amplifier device, the first amplifying unit and the second amplifying unit are triodes.
The utility model discloses following beneficial effect has: the trigger signal is adopted for driving, the structure is simple, the performance is stable, the power consumption of the amplifying unit is zero in a static state and is extremely low in a dynamic state, the response speed of the amplifying unit to the trigger signal is high, and the input signal can be captured in real time.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a low power consumption active filtering and amplifying device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a low power consumption active filtering amplifying device according to another embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a low power consumption active filtering amplifying device provided by an embodiment of the present invention, the low power consumption active filtering amplifying device includes a differential filtering amplifying unit 1 and a bias current source unit 2.
The bias current source unit 2 adopts a charge pump design based on an RC high-pass filter structure, the bias current source unit 2 includes a trigger signal terminal Trig, a capacitor C4, a capacitor C3 and a resistor R9, the trigger signal terminal Trig is connected to one end of the capacitor C4, the other end of the capacitor C4 is connected to one end of the capacitor C3 and one end of the resistor R9, the other end of the capacitor C3 is connected to the first node J1, and the first node J1 is a differential filtering amplification unit 1; preferably, the trigger signal terminal Trig is connected to a square wave signal, and becomes a pulse signal after passing through the bias current source unit 2, and drives the differential filtering and amplifying unit 1 to capture the signal, that is, the differential filtering and amplifying unit 1 adopts a current source for pulse output to provide bias, and the continuous working time of the square wave signal differential filtering and amplifying unit 1 after each start-up is reduced to nS level, so that the dynamic power consumption is reduced; because the signal is a square wave signal, when there is no pulse current, the differential filtering and amplifying unit 1 does not consume energy when there is no pulse current bias, and the static power consumption is zero. The trigger signal terminal Trig can also be accessed to other waveforms, the differential filtering amplification unit 1 only works in the process of change of the trigger signal, the faster the jump of the trigger signal is, the shorter the working time of the differential filtering amplification unit 1 is, and the better the transient signal capturing effect is.
Preferably, the bias current source unit 2 further includes a resistor R7, one end of the resistor R7 is connected to the first node J1, and the other end of the resistor R7 is connected to the differential filter amplifier unit 1.
The other end of the resistor R9 is connected to a preset first voltage source VCC or a preset IO port of the MCU, and voltage output is performed through the IO port controlled by the MCU.
The bias current source unit 2 further includes a resistor R8, and one end of the resistor R8 is connected to the first node J1.
The utility model discloses a differential filtering amplification unit 1 have differential amplifier's various characteristics and advantage, such as common mode rejection, balanced input, balanced output etc, differential filtering amplification unit includes first differential input IN +, second differential input IN-, first differential output OUT +, second differential output OUT-, first filter unit 11, second filter unit 12, third filter unit 13, fourth filter unit 14, first amplification unit Q1 and second amplification unit Q2, first amplification unit Q1's first end through first filter unit 11 connect IN first differential input IN +, first amplification unit Q2's second end connect IN second node J2, first amplification unit Q1's third end connect IN third node J3 and the one end of second filter unit 12, the other end of second filter unit 12 connect IN first differential output OUT +, a first terminal of the second amplifying unit Q2 is connected to the second differential input terminal IN-through a third filtering unit 13, a second terminal of the second amplifying unit Q2 is connected to a second node J2, a third terminal of the second amplifying unit Q2 is connected to a third node and one terminal of the fourth filtering unit 14, and the other terminal of the fourth filtering unit 14 is connected to the second differential output terminal OUT-.
The first filtering unit 11 includes an inductor L1 and a resistor R3, the second filtering unit 12 includes an inductor L3 and a capacitor C1, the third filtering unit 13 includes an inductor L2 and a resistor R4, and the fourth filtering unit 14 includes an inductor L4 and a capacitor C2.
The second node J2 is connected to the other end of the resistor R7, and the third node J3 is connected to a preset voltage source VCC or an IO port of a preset MCU, and outputs a voltage through the IO port controlled by the MCU. The signal of the differential filtering amplification unit 1 provided by the embodiment is differentially input from IN +, IN-end; after amplification, the OUT + and OUT-terminals output differentially; i.e. the difference between the voltages at the two inputs is amplified with a fixed gain and provides two outputs.
In this embodiment, the first amplifying unit Q1 and the second amplifying unit Q2 are preferably NPN transistors;
one end of the inductor L1 is connected to the first differential input terminal IN +, a base of the first amplifying unit Q1 is connected to the other end of the first inductor L1, the resistor R1 is connected to a collector of the first amplifying unit Q1 and one end of the inductor L3, the other end of the resistor R1 is connected to the third node J3, an emitter of the first amplifying unit Q1 is connected to the second node J2, and the other end of the inductor L3 is connected to one end of the capacitor C1 and the first differential output terminal OUT +.
One end of the resistor R3 is connected to the base of the first amplifying unit Q1.
The resistor R5 is connected between the emitter of the first amplifying unit Q1 and the second node J2.
One end of an inductor L2 is connected to the second differential input terminal IN-, a base of the second amplifying unit Q2 is connected to the other end of the inductor L2, the resistor R2 is connected to a collector of the second amplifying unit Q2 and one end of the inductor L4, the other end of the resistor R2 is connected to the third node J3, an emitter of the second amplifying unit Q2 is connected to the second node J2, and the other end of the inductor L4 is connected to one end of the capacitor C2 and the second differential output terminal OUT-.
One end of the resistor R4 is connected to the base of the second amplifying unit Q2.
The resistor R6 is connected between the emitter of the second amplifying unit Q2 and the second node J2.
In this embodiment, the third node J3 is connected to a predetermined voltage VCC, and the other end of the resistor R8 is connected to a predetermined reference ground.
Through the arrangement of the resistor R3, the resistor R5, the resistor R4 and the resistor R6, the trigger signal end Trig is connected with the square wave signal, the differential filtering and amplifying unit 1 works in the falling process of the trigger signal (Trig) level, and when the trigger signal is in a stable state and a rising edge state, the input end and the output end of the differential filtering and amplifying unit 1 are in a high impedance state.
The resistor R7, the resistor R5 and the resistor R4 have the following embodiments:
in the first embodiment, the circuit includes a resistor R7, a resistor R5, and a resistor R4.
In the second embodiment, the circuit includes only the resistor R7, and the resistor R5 and the resistor R4 are shorted.
In the third embodiment, the circuit includes a resistor R5 and a resistor R4, and the resistor R7 is short-circuited.
In the above example, the frequency selective element is added to the differential filtering and amplifying unit 1, so that the electromagnetic compatibility is improved, and the performance stability of the circuit is ensured.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a low power consumption active filtering amplifier device according to another embodiment of the present invention, the present invention further provides another embodiment as shown in fig. 2, which is different from the embodiment shown in fig. 1 in that the first amplifying unit Q4 and the second amplifying unit Q3 are PNP type triodes, and the third node J3 is connected to a preset reference ground, the other end of the resistor R8 is connected to a preset voltage VCC, and the resistor R13 and the resistor R14 are also connected to a preset voltage VCC.
In summary, the low-power-consumption active filtering amplification device is controlled and driven by the trigger signal terminal Trig, and has the advantages of simple structure, stable performance, zero static power consumption, extremely low dynamic power consumption, extremely short pulse current establishment time, no start-up delay of the differential filtering amplification unit 1, and capability of capturing input signals in real time. Therefore, the utility model discloses improved differential filtering amplification unit 1's frequency characteristic, it is further, through this low-power consumption active power filter amplification device's output differential signal, adopt the algorithm to discern and rebuild original signal's nonlinear distortion through singlechip etc. that connect again for measurement accuracy and stability have obtained the promotion of essence, and product reliability is obviously superior to prior art's like product.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. A low-power consumption active filtering amplification device is characterized by comprising a differential filtering amplification unit and a bias current source unit;
the bias current source unit comprises a trigger signal end, a first capacitor, a second capacitor and a first resistor, wherein the trigger signal end is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the second capacitor and one end of the first resistor, the other end of the second capacitor is connected to a first node, and the first node is connected to the differential filtering amplification unit; and the trigger signal end is connected with a square wave signal to drive the differential filtering amplification unit to capture the signal.
2. The active filter amplifier apparatus with low power consumption of claim 1, wherein the bias current source unit further comprises a second resistor, one end of the second resistor is connected to the first node, and the other end of the second resistor is connected to the differential filter amplifier unit.
3. The active filter amplifier apparatus with low power consumption of claim 2, wherein the bias current source unit further comprises a third resistor, and one end of the third resistor is connected to the first node.
4. The active filtering amplifier device with low power consumption of claim 3, wherein the differential filtering amplifier unit comprises a first differential input terminal, a second differential input terminal, a first differential output terminal, a second differential output terminal, a first filtering unit, a second filtering unit, a third filtering unit, a fourth filtering unit, a first amplifying unit and a second amplifying unit, a first end of the first amplifying unit is connected to the first differential input terminal through the first filtering unit, a second end of the first amplifying unit is connected to the second node, a third end of the first amplifying unit is connected to a third node and one end of the second filtering unit, the other end of the second filtering unit is connected to the first differential output terminal, a first end of the second amplifying unit is connected to the second differential input terminal through the third filtering unit, the second end of the second amplifying unit is connected to a second node, the third end of the second amplifying unit is connected to a third node and one end of the fourth filtering unit, the other end of the fourth filtering unit is connected to the second differential output end, and the second node is connected to the other end of the second resistor.
5. The active filtering amplifying device with low power consumption according to claim 4, wherein the first filtering unit includes a first inductor and a fourth resistor, one end of the first inductor is connected to the first differential input terminal, and a first end of the first amplifying unit is connected to the other end of the first inductor and one end of the fourth resistor;
the second filtering unit comprises a second inductor and a third capacitor, one end of the second inductor is connected to the third end of the first amplifying unit, and the other end of the second inductor is connected to one end of the third capacitor and the first differential output end;
the third filtering unit comprises a third inductor and a fifth resistor, one end of the third inductor is connected to the second differential input end, and the first end of the second amplifying unit is connected to the other end of the third inductor and one end of the fifth resistor;
the fourth filtering unit comprises a fourth inductor and a fourth capacitor, one end of the second inductor is connected to the third end of the first amplifying unit, and the other end of the second inductor is connected to one end of the third capacitor and the first differential output end.
6. The active filtering and amplifying device with low power consumption of claim 5, wherein the differential filtering and amplifying unit further comprises a sixth resistor and a seventh resistor;
the sixth resistor is connected between the second end of the first amplification unit and the second node, and the seventh resistor is connected between the second end of the second amplification unit and the second node.
7. The active filtering and amplifying device with low power consumption of claim 5, wherein the differential filtering and amplifying unit further comprises an eighth resistor and a ninth resistor;
the eighth resistor is connected between the third end of the first amplifying unit and the third node, and the ninth resistor is connected between the third end of the second amplifying unit and the third node.
8. The active filtering and amplifying device with low power consumption according to any one of claims 4 to 7, wherein the third node is connected to a predetermined voltage, and the other end of the third resistor is connected to a predetermined reference ground.
9. The active filtering and amplifying device with low power consumption according to any one of claims 4 to 7, wherein the third node is connected to a predetermined reference ground, and the other end of the third resistor is connected to a predetermined voltage.
10. The active filtering amplification device with low power consumption of any one of claims 4 to 7, wherein the first amplification unit and the second amplification unit are both transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920938661.7U CN210075178U (en) | 2019-06-20 | 2019-06-20 | Low-power consumption active filtering amplifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920938661.7U CN210075178U (en) | 2019-06-20 | 2019-06-20 | Low-power consumption active filtering amplifying device |
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| Publication Number | Publication Date |
|---|---|
| CN210075178U true CN210075178U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920938661.7U Active CN210075178U (en) | 2019-06-20 | 2019-06-20 | Low-power consumption active filtering amplifying device |
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| CN (1) | CN210075178U (en) |
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Address after: 518000 R & D building 901, block a, building 7, phase I, Wanke Yuncheng phase I, Xili community, Xili street, Nanshan District, Shenzhen City, Guangdong Province (9 / F, whole floor) Patentee after: SHENZHEN HAC TELECOM TECHNOLOGY Co.,Ltd. Address before: Xili Lake Road Shenzhen City, Guangdong province 518000 No. 4227 Nanshan District nine Xiang Ling new industrial district 2 Building 6 floor Patentee before: SHENZHEN HAC TELECOM TECHNOLOGY Co.,Ltd. |