CN212588305U - Power amplification circuit and detection terminal - Google Patents
Power amplification circuit and detection terminal Download PDFInfo
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- CN212588305U CN212588305U CN202120138693.6U CN202120138693U CN212588305U CN 212588305 U CN212588305 U CN 212588305U CN 202120138693 U CN202120138693 U CN 202120138693U CN 212588305 U CN212588305 U CN 212588305U
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Abstract
The utility model discloses a power amplification circuit and detection terminal, it includes power amplifier, first system power source node and first voltage follower, the input and the first system power source node of first voltage follower are connected, the output of first voltage follower is connected with power amplifier's first power end, it directly gives the mode of power amplifier power supply to be distinguished from among the prior art system power supply, its system power is for the power supply of voltage follower, and then provide unsteady adjustable power supply for power amplifier according to actual output, when keeping current circuit structure and parameter, the exportable signal that surpasss chip supply voltage restriction itself, according to the amplitude of incoming signal under the condition that does not change the circuit structure who designs, reach the purpose of wide output.
Description
Technical Field
The utility model belongs to the technical field of signal power amplification, concretely relates to power amplification circuit and detection terminal.
Background
A power amplifier, referred to as "power amplifier" for short, refers to an amplifier that can generate maximum power output to drive a load under a given distortion rate. The power amplifier is mainly used for amplifying weak analog signals which are directly acquired or converted by the high-precision digital-to-analog converter DAC, and then generating enough current to drive loads, such as a loudspeaker in a sound device, a pixel point diode in an OLED screen and the like.
The existing power amplifier circuit design idea is to set the amplification gain and the parameter configuration of the circuit around the power amplifier according to the input and the output, so as to achieve the purpose of obtaining the specified output. However, according to the data manual of the power amplifier, the output voltage of the power amplifier cannot be higher than the power voltage range, and especially when the ac signal is output, the output range of the power amplifier is limited by the influence of the power supply and is narrow, so the slew rate of the output signal is relatively small.
SUMMERY OF THE UTILITY MODEL
To the above defect or the improvement demand of prior art, the utility model provides a power amplification circuit aims at solving current power amplifier's output range and can be subject to power supply's influence and narrower technical problem.
To achieve the above object, according to an aspect of the present invention, there is provided a power amplifier circuit, which includes a power amplifier, a first system power node and a first voltage follower, wherein an input terminal of the first voltage follower is connected to the first system power node, and an output terminal of the first voltage follower is connected to a first power terminal of the power amplifier.
As a further improvement of the utility model, the power amplification circuit still includes second system power supply node and second voltage follower, and the input and the second system power supply node of second voltage follower are connected, and the output and the second power end of power amplifier of second voltage follower are connected.
As a further improvement of the utility model, the power amplification circuit further comprises a first circuit protection module, and the first circuit protection module is connected with the drainage end of the first voltage follower.
As a further improvement of the utility model, this power amplification circuit still is provided with first partial pressure subassembly, and first system power supply node, first circuit protection module and system output node are connected respectively to the three-terminal of first partial pressure subassembly.
As a further improvement of the utility model, the power amplification circuit still includes second system power supply node, second voltage follower and second circuit protection module, the input and the second system power supply node of second voltage follower are connected, the output and the second power end of power amplifier of second voltage follower are connected, and second circuit protection module is connected with the drainage end of second voltage follower.
As a further improvement, the power amplifier circuit is further provided with a second voltage division component, and the three ends of the second voltage division component are respectively connected with a power node of a second system, a protection module of a second circuit and an output node of the system.
As a further improvement of the present invention, the power amplification circuit further includes a filter for the signal input terminal of the series connection system and the signal input terminal of the power amplifier.
As a further improvement of the present invention, the filter is one of a high-pass filter, a low-pass filter and a band-pass filter.
As a further improvement of the present invention, the power amplifier circuit further includes a compensation resistor, and the compensation resistor is used for the signal output terminal and the system signal output terminal of the series connection power amplifier.
To achieve the above object, according to another aspect of the present invention, there is provided a detection terminal including the above power amplification circuit.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, has following beneficial effect:
the utility model discloses a power amplification circuit and detection terminal, provide dynamic adjustable power supply for power amplifier through first voltage follower, be different from the mode that system power supply directly supplied power for power amplifier among the prior art, its system power is for the power supply of voltage follower, and then provide unsteady adjustable power supply for power amplifier according to actual output, when keeping current circuit structure and parameter, the exportable signal that surpasss the power supply voltage restriction of chip itself, both can break through the power amplifier chip power supply restriction on the one hand, on the other hand also can break through the parameter restriction that power amplification circuit set for in advance, according to input signal's amplitude, under the condition that does not change the circuit structure who designs, reach the purpose of wide output.
The utility model discloses a power amplification circuit and test terminal, the power amplifier that its adopted can be the power amplifier of low price relatively, two poles of the earth power end for power amplifier provides dynamic adjustable power supply through first voltage follower and second voltage follower, when its input signal is alternating current signal, its signal frequency is in the bandwidth scope, the amplitude is higher, the slew rate of signal is just also higher, therefore can reach the output high pressure slew rate equally, wide output, the purpose of the signal of strong driving force, can reduce the hardware cost greatly like this, and then improve the recessive income of product.
The utility model discloses a power amplification circuit and detection terminal constitutes power amplification circuit with single power amplifier and compares, if the demand changes, need not to change the hardware architecture, only changes pin and can satisfy the demand to the chip of pin or adjustment system power input voltage, can make circuit design tend to modularization, standardization like this, has improved the range of application.
The utility model discloses a power amplification circuit and test terminal can also be as required newly-increased compensation resistance, further lift system driving force, lift system's area load capacity and stability through the mode that increases compensation resistance.
The utility model discloses a power amplification circuit and detection terminal through setting up the first circuit protection module that acts on first voltage follower respectively, act on the second circuit protection module of second voltage follower, when power amplification circuit's load is overweight or power loss is too big, can reduce power amplifier's load through circuit protection module to reduce palirrhea influence that causes the voltage follower.
Drawings
Fig. 1 is a schematic structural diagram of a power amplifier circuit according to the technical solution of the present invention;
fig. 2 is a schematic structural diagram of a specific embodiment of the technical solution of the present invention;
in all the figures, the same reference numerals denote the same features, in particular:
100-power amplifier, 101-filter, 102-compensation resistor, 200-first voltage follower, 201-first system power supply node, 202-first circuit protection module, 203-first voltage division component, 300-second voltage follower, 301-second system power supply node, 302-second circuit protection module, 303-second voltage division component, 400-system input node, 500-system output node.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to the following embodiments.
The technical terms related to the utility model are explained as follows:
a voltage follower: an emitter follower, i.e., a common collector amplifier circuit, is a widely used circuit, and mainly functions to amplify an alternating current to improve the load carrying capability of the entire amplifier circuit. In practical circuits, it is generally used as an output stage or an isolation stage. The amplifier is characterized in that the input impedance is high, the output impedance is low, so that the current required by a signal source is small and the load capacity is strong, and the amplifier is commonly used for an input stage and an output stage of a multi-stage amplifying circuit; it can also be used to connect two circuits, reducing the influence caused by direct connection between the circuits and playing a role of buffering.
Slew rate: refers to the average value of the time rate of change of the output voltage of the closed loop amplifier when the input is a step signal.
In one embodiment, a power amplification circuit is provided, which specifically includes a power amplifier, a first system power node, and a first voltage follower, an input terminal of the first voltage follower is connected to the first system power node, and an output terminal of the first voltage follower is connected to a first power terminal of the power amplifier, where the first power terminal may be a positive power terminal or a negative power terminal of the power amplifier, and the first voltage follower may be composed of the power amplifier with an amplification gain of 1 and a peripheral device, as an example. The power amplifier is different from the conventional design that the power supply of the power amplifier circuit directly supplies power to the power end of the power amplifier, but adopts the mode that the power supply of the system supplies power to the voltage follower, can realize that the floating adjustable power supply is provided for the power amplifier according to the actual output of the system, and can output signals exceeding the limit of the power supply voltage of the power amplifier chip when the structure and parameters of the existing circuit are maintained.
Preferably, the power amplification circuit further comprises a first circuit protection module, and the first circuit protection module is connected with the current-leading end of the first voltage follower. The voltage follower is mainly used for providing a power supply for the power amplifier, when the load of the power amplifying circuit is too heavy or the power loss is too large, the voltage follower is pulled down, then the current in the circuit may flow in a reverse direction to damage the voltage follower, the load of the power amplifier can be reduced through the first circuit protection module, so that the influence of the reverse flow on the first voltage follower is reduced, for example, the circuit protection module can be a schottky diode, and of course, the corresponding circuit protection module can be set according to the requirement.
Preferably, the power amplifying circuit further includes a second system power node and a second voltage follower, an input terminal of the second voltage follower is connected to the second system power node, and an output terminal of the second voltage follower is connected to a second power terminal of the power amplifier, wherein a polarity of the second power terminal is opposite to a polarity of the first power terminal, and if the first power terminal is an anode power terminal of the power amplifier, the second power terminal is a cathode power terminal of the power amplifier; when the first power supply end is the negative power supply end of the power amplifier, the second power supply end is the positive power supply end of the power amplifier. As an example, the first voltage follower may be constituted by a power amplifier having an amplification gain of 1 and peripheral devices. Through the arrangement, for the amplification of the alternating current signal, a floating adjustable power supply can be better provided for the power amplification circuit applied to the alternating current signal, and for the amplified alternating current signal, the higher the amplitude value in the bandwidth is, and the higher the slew rate is.
Preferably, the power amplification circuit further comprises a second circuit protection module, and the second circuit protection module is connected with the current-leading end of the second voltage follower. The voltage follower is mainly used for providing power for the power amplifier, when the load of the power amplification circuit is too heavy or the power loss is too large, the voltage follower is pulled down, then the current in the circuit can flow reversely to damage the voltage follower, the load of the power amplifier can be reduced through the second circuit protection module, and therefore the influence of reverse flow on the second voltage follower is reduced.
Preferably, the power amplifier circuit further comprises a filter for connecting the system signal input terminal and the signal input terminal of the power amplifier in series, and for the signal from the system signal input terminal, the filter characteristic of the filter can be utilized, in combination with the frequency characteristic of the useful signal, to filter noise within the bandwidth range of the power amplifier, to retain the useful signal to be amplified, and further to amplify the useful signal by the power amplifier.
Preferably, the power amplifying circuit further comprises a compensation resistor, the compensation resistor is used for connecting the signal output end of the power amplifier and the system signal output end in series, when the load driven by the output node is a capacitive load, the circuit system can oscillate due to the input alternating current signal, but if the compensation resistor is added outside the loop, together with the load resistor, the zero position of the time domain dynamic response can be changed, so that the oscillation in the circuit is compensated, and the capacity of the system for driving the capacitive load is enhanced.
Fig. 1 is a schematic structural diagram of a power amplification circuit according to the technical solution of the present invention. As shown in fig. 1, as a preferred embodiment, a power amplification circuit includes a system input node 400, a filter 101, a power amplifier 100, a first voltage follower 200, a first system power supply node 201, a first circuit protection module 202, a second voltage follower 300, a second system power supply node 301, a second circuit protection module 302, a compensation resistor 102, and a system output node 500. The signal to be amplified is input through the system input node 400, and the signal input through the system input node 400 may be a direct current signal or an alternating current signal.
As an example, the first system power supply node 201 is a positive power supply input of the entire power amplification circuit, connected to the power supply terminal anode of the first voltage follower 200, for a forward operation voltage required for the operation of the first voltage follower 200; the first circuit protection module 202 is connected to the output terminal of the first voltage follower 200, and is used for protecting the amplifier in the first voltage follower 200 from being damaged by reverse current; the output terminal of the second voltage follower 300 is connected to the negative terminal of the power supply terminal of the power amplifier 100 for providing the power amplifier with a negative power supply required for operation.
The second system power supply node 301 is a negative power supply input of the entire power amplification circuit, connected to the power supply terminal negative electrode of the second voltage follower 300, and configured to provide a negative working voltage required for the operation of the second voltage follower 300; the second circuit protection module 302 is connected to the output terminal of the second voltage follower 300, and is used for protecting the amplifier in the second voltage follower 300 from being damaged by reverse current; the compensation resistor 102 is connected between the output terminal of the power amplifier 100 and the system output node 500, and is used for improving the loading capacity of the system. The compensation resistor is taken as an example of an annular feedback network, the position of the feedback resistor can be changed according to the type of system output, when the signal is direct current, the feedback resistor can be placed in an annular, the feedback network can compensate the voltage drop generated by the direct current signal on the compensation resistor, and further the loading capacity of the direct current signal is enhanced, when the signal is alternating current, the feedback resistor can be placed outside the annular and acts with a load, the oscillation in a circuit is reduced, and the capacity of driving the load is improved.
Fig. 2 is a schematic structural diagram of a specific embodiment of the technical solution of the present invention. As a preferable scheme, the system is further provided with a first voltage division component 203, wherein three terminals of the first voltage division component 203 are respectively connected with a first system power supply node 201 (also an input terminal of the first voltage follower), a first circuit protection module 202 and a system output node 500 (also an output terminal of the compensation resistor 102), and by the above arrangement, a forward input of the first voltage follower 200 is obtained by a positive power supply and an output through the first voltage division component 203, and a feedback network is formed, so that the forward input power supply of the first voltage follower is adjusted according to the system output voltage and the power supply requirement of the power amplifier. With the above arrangement, in combination with the output, the power supply of the first voltage follower can be automatically adjusted, but in order to reduce the heat loss of the power amplifier due to an excessive voltage difference, the input power supply is usually adjusted by a small amplitude under the control of software according to the output.
The system is further provided with a second voltage division component 303, wherein three ends of the second voltage division component 303 are respectively connected with a second system power supply node 301 (also an input end of the second voltage follower), a second circuit protection module 302 and a system output node 500 (also an output end of the compensation resistor 102), and through the arrangement, negative input of the second voltage follower 300 is obtained by a negative power supply and output through the second voltage division component 303, and a negative input power supply of the second voltage follower is adjusted according to the system output voltage and the power supply requirement of the power amplifier by forming a feedback network. Similarly, by the above arrangement, in combination with the output, the power supply of the second voltage follower can be automatically adjusted, but in order to reduce the heat consumption of the power amplifier due to the excessive voltage difference, the input power supply is usually adjusted by a small amplitude under the control of software according to the output.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A power amplification circuit is characterized by comprising a power amplifier, a first system power supply node and a first voltage follower, wherein the input end of the first voltage follower is connected with the first system power supply node, and the output end of the first voltage follower is connected with a first power supply end of the power amplifier.
2. A power amplifying circuit according to claim 1, wherein the power amplifying circuit further comprises a second system power supply node and a second voltage follower, an input terminal of the second voltage follower being connected to the second system power supply node and an output terminal of the second voltage follower being connected to the second power supply terminal of the power amplifier.
3. A power amplifier circuit according to claim 1 or 2, wherein the power amplifier circuit further comprises a first circuit protection block, the first circuit protection block being connected to the drain terminal of the first voltage follower.
4. A power amplifier circuit according to claim 3, wherein the power amplifier circuit is further provided with a first voltage divider, and three ends of the first voltage divider are respectively connected to the first system power node, the first circuit protection module and the system output node.
5. A power amplifier circuit according to claim 1, wherein said power amplifier circuit further comprises a first circuit protection module, a second system power node, a second voltage follower and a second circuit protection module, said first circuit protection module is connected to a drain terminal of said first voltage follower, said second voltage follower has an input terminal connected to said second system power node, said second voltage follower has an output terminal connected to a second power terminal of said power amplifier, and said second circuit protection module is connected to a drain terminal of said second voltage follower.
6. The power amplifier circuit according to claim 5, wherein the power amplifier circuit is further provided with a second voltage-dividing component, and three ends of the second voltage-dividing component are respectively connected to a second system power node, a second circuit protection module and a system output node.
7. A power amplifying circuit according to claim 1 or 2, wherein the power amplifying circuit further comprises a filter for connecting the system signal input and the signal input of the power amplifier in series.
8. A power amplifying circuit according to claim 7, wherein the filter is one of a high pass filter, a low pass filter and a band pass filter.
9. A power amplifying circuit according to claim 1 or 2, wherein the power amplifying circuit further comprises a compensation resistor for connecting the signal output terminal of the power amplifier and the system signal output terminal in series.
10. A detection terminal, characterized in that it comprises a power amplification circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120138693.6U CN212588305U (en) | 2021-01-19 | 2021-01-19 | Power amplification circuit and detection terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120138693.6U CN212588305U (en) | 2021-01-19 | 2021-01-19 | Power amplification circuit and detection terminal |
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| CN212588305U true CN212588305U (en) | 2021-02-23 |
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| CN202120138693.6U Active CN212588305U (en) | 2021-01-19 | 2021-01-19 | Power amplification circuit and detection terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113520407A (en) * | 2021-07-14 | 2021-10-22 | 深圳英智科技有限公司 | Electroencephalogram amplifier |
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2021
- 2021-01-19 CN CN202120138693.6U patent/CN212588305U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113520407A (en) * | 2021-07-14 | 2021-10-22 | 深圳英智科技有限公司 | Electroencephalogram amplifier |
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