CN203775145U - Wideband power amplifier based on T-type feedback network - Google Patents
Wideband power amplifier based on T-type feedback network Download PDFInfo
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- CN203775145U CN203775145U CN201320750761.XU CN201320750761U CN203775145U CN 203775145 U CN203775145 U CN 203775145U CN 201320750761 U CN201320750761 U CN 201320750761U CN 203775145 U CN203775145 U CN 203775145U
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- operational amplifier
- resistance
- input end
- signal output
- wideband power
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- 230000003321 amplification Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000003412 degenerative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Abstract
The utility model discloses a wideband power amplifier based on a T-type feedback network. The wideband power amplifier comprises a first operational amplifier OP1, a second operational amplifier OP2 and the T-type feedback resistance network. A voltage input end Ui is connected with the inverted input end of the first operational amplifier OP1 through a resistor R1, the in-phase input end of the first operational amplifier OP1 is connected to the ground through a fifth resistor R5, the signal output end of the first operational amplifier OP1 is connected with the inverted input end of the first operational amplifier OP1 through the T-type feedback resistance network, the signal output end of the first operational amplifier OP1 is further connected with the inverted input end of the second operational amplifier OP2 through a sixth resistor R6, a resistor R8 is connected between the signal output end and the inverted input end of the second operational amplifier OP2, and the in-phase input end of the second operational amplifier OP2 is connected to the ground. Temperature drift errors are effectively reduced, a circuit is simple in structure, the wideband power amplifier has larger amplification factors compared with a traditional power amplifier, and the signal fidelity factor of the wideband power amplifier is higher in the transmission process.
Description
Technical field
The utility model relates to a kind of wideband power amplifer based on T-shaped feedback network.
Background technology
Electronic information technology has almost been dominated the development of whole electrical apparatus industry, and along with the development of electronic technology, the design of power amplifier is also constantly updated.The application of power amplifier in household electrical appliances, digital product is also more and more extensive, with our daily life close relation.But traditional power amplifier exists following deficiency when small-signal processing: (1), in order to obtain the amplifier feedback resistance that designs larger resistance compared with large input resistance and multiplication factor, the feedback resistance of larger resistance can produce the larger drift temperature difference; (2) in the process of signal transmission, ground wire can be subject to signal and disturb generation disturbance, and signal can produce serious harmonic wave after traditional amplifier, and output distortion rate is large.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and the wideband power amplifer based on T-shaped feedback network that a kind of distortion rate is low is provided, and in obtaining larger multiplication factor and higher input resistance, can reduce temperature error.
The purpose of this utility model is achieved through the following technical solutions: based on the wideband power amplifer of T-shaped feedback network, it comprises the first operational amplifier OP1, the second operational amplifier OP2 and T-shaped feedback resistive network, voltage input end Ui is connected with the inverting input of the first operational amplifier OP1 by the first resistance R 1, the in-phase input end of the first operational amplifier OP1 is connected with ground by the 5th resistance R 5, the signal output part of the first operational amplifier OP1 is connected with the inverting input of the first operational amplifier OP1 by T-shaped feedback resistive network, the signal output part of the first operational amplifier OP1 is also connected with the inverting input of the second operational amplifier OP2 by the 6th resistance R 6, between the inverting input of the signal output part of the second operational amplifier OP2 and the second operational amplifier OP2, be connected with the 8th resistance R 8, the in-phase input end ground connection of the second operational amplifier OP2, voltage output end Uo is connected with the signal output part of the second operational amplifier OP2.
Described T-shaped feedback resistive network comprises the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, one end of the second resistance R 2 is connected with the inverting input of the first operational amplifier OP1, the other end of the second resistance R 2 is connected with the signal output part of the first operational amplifier OP1 by the 3rd resistance R 3 of series connection, and the common port of the second resistance R 2 and the 3rd resistance R 3 is connected with ground by the 4th resistance R 4.
Further, the utility model also comprises that one end of the 7th resistance R 7, the seven resistance R 7 is parallel on the points of common connection of the 6th resistance R 6 and the second operational amplifier OP2 inverting input, other end ground connection.
The beneficial effects of the utility model are:
1) adopt T-shaped feedback resistive network to replace traditional feedback resistance, in meeting the input resistance and multiplication factor of signal processing requirement, all resistance in T-shaped feedback resistive network are all less than 1M Ω, have effectively reduced temperature drift error;
2) circuit structure is simple, adopts the amplifier of T-shaped feedback resistive network to have larger multiplication factor than the amplifier that adopts traditional feedback resistance.
3) inverting input of the second operational amplifier OP2 is connected with ground by the 7th resistance R 7, and ground signal is fed back to the second operational amplifier OP2, and ground, as the input signal of R7, plays degenerative effect to the second operational amplifier OP2; The in-phase input end of the second operational amplifier OP2 is connected with ground, earth signal is directly introduced in-phase input end, the second operational amplifier OP2 is there is to the effect of positive feedback, ground signal is cancelled out each other to the positive and negative feedback of the second operational amplifier OP2, reduce interference that ground wire the is subject to impact on signal, effectively reduced the harmonic wave that signal produces in transmitting procedure, signal distortion rate is low.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection range of the present utility model is not limited to the following stated.
As shown in Figure 1, based on the wideband power amplifer of T-shaped feedback network, it comprises the first operational amplifier OP1, the second operational amplifier OP2 and T-shaped feedback resistive network, voltage input end Ui is connected with the inverting input of the first operational amplifier OP1 by the first resistance R 1, the in-phase input end of the first operational amplifier OP1 is connected with ground by the 5th resistance R 5, the signal output part of the first operational amplifier OP1 is connected with the inverting input of the first operational amplifier OP1 by T-shaped feedback resistive network, the signal output part of the first operational amplifier OP1 is also connected with the inverting input of the second operational amplifier OP2 by the 6th resistance R 6, between the inverting input of the signal output part of the second operational amplifier OP2 and the second operational amplifier OP2, be connected with the 8th resistance R 8, the in-phase input end ground connection of the second operational amplifier OP2, voltage output end Uo is connected with the signal output part of the second operational amplifier OP2.
T-shaped feedback resistive network described in the utility model comprises the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, one end of the second resistance R 2 is connected with the inverting input of the first operational amplifier OP1, the other end of the second resistance R 2 is connected with the signal output part of the first operational amplifier OP1 by the 3rd resistance R 3 of series connection, the common port of the second resistance R 2 and the 3rd resistance R 3 is connected with ground by the 4th resistance R 4, adopt T-shaped feedback resistive network to replace traditional feedback resistance, in meeting the input resistance and multiplication factor of signal processing requirement, all resistance in T-shaped feedback resistive network are all less than 1M Ω, effectively reduce temperature drift error.
The utility model also comprises that one end of the 7th resistance R 7, the seven resistance R 7 is parallel on the points of common connection of the 6th resistance R 6 and the second operational amplifier OP2 inverting input, other end ground connection.
The inverting input of the utility model the second operational amplifier OP2 is connected with ground by the 7th resistance R 7, and ground signal is fed back to the second operational amplifier OP2, and ground, as the input signal of R7, plays degenerative effect to the second operational amplifier OP2; The in-phase input end of the second operational amplifier OP2 is connected with ground, earth signal is directly introduced in-phase input end, the second operational amplifier OP2 is there is to the effect of positive feedback, ground signal is cancelled out each other to the positive and negative feedback of the second operational amplifier OP2, reduce interference that ground wire the is subject to impact on signal, effectively reduced the harmonic wave that signal produces in transmitting procedure, signal distortion rate is low.
The above is only preferred implementation of the present utility model, be to be understood that the utility model is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, amendment and environment, and can, in contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not depart from spirit and scope of the present utility model, all should be in the protection range of the utility model claims.
Claims (3)
1. the wideband power amplifer based on T-shaped feedback network, it is characterized in that: it comprises the first operational amplifier OP1, the second operational amplifier OP2 and T-shaped feedback resistive network, voltage input end Ui is connected with the inverting input of the first operational amplifier OP1 by the first resistance R 1, the in-phase input end of the first operational amplifier OP1 is connected with ground by the 5th resistance R 5, the signal output part of the first operational amplifier OP1 is connected with the inverting input of the first operational amplifier OP1 by T-shaped feedback resistive network, the signal output part of the first operational amplifier OP1 is also connected with the inverting input of the second operational amplifier OP2 by the 6th resistance R 6, between the inverting input of the signal output part of the second operational amplifier OP2 and the second operational amplifier OP2, be connected with the 8th resistance R 8, the in-phase input end ground connection of the second operational amplifier OP2, voltage output end Uo is connected with the signal output part of the second operational amplifier OP2.
2. the wideband power amplifer based on T-shaped feedback network according to claim 1, it is characterized in that: described T-shaped feedback resistive network comprises the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, one end of the second resistance R 2 is connected with the inverting input of the first operational amplifier OP1, the other end of the second resistance R 2 is connected with the signal output part of the first operational amplifier OP1 by the 3rd resistance R 3 of series connection, and the common port of the second resistance R 2 and the 3rd resistance R 3 is connected with ground by the 4th resistance R 4.
3. the wideband power amplifer based on T-shaped feedback network according to claim 1, it is characterized in that: it also comprises the 7th resistance R 7, one end of the 7th resistance R 7 is parallel on the points of common connection of the 6th resistance R 6 and the second operational amplifier OP2 inverting input, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320750761.XU CN203775145U (en) | 2013-11-25 | 2013-11-25 | Wideband power amplifier based on T-type feedback network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320750761.XU CN203775145U (en) | 2013-11-25 | 2013-11-25 | Wideband power amplifier based on T-type feedback network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203775145U true CN203775145U (en) | 2014-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320750761.XU Expired - Lifetime CN203775145U (en) | 2013-11-25 | 2013-11-25 | Wideband power amplifier based on T-type feedback network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203775145U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533371A (en) * | 2016-12-09 | 2017-03-22 | 国网江西省电力公司电力科学研究院 | Transconductance current power amplifier |
-
2013
- 2013-11-25 CN CN201320750761.XU patent/CN203775145U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533371A (en) * | 2016-12-09 | 2017-03-22 | 国网江西省电力公司电力科学研究院 | Transconductance current power amplifier |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140813 |