CN104242831A - Wideband amplification device with low noise - Google Patents
Wideband amplification device with low noise Download PDFInfo
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- CN104242831A CN104242831A CN201410549520.8A CN201410549520A CN104242831A CN 104242831 A CN104242831 A CN 104242831A CN 201410549520 A CN201410549520 A CN 201410549520A CN 104242831 A CN104242831 A CN 104242831A
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- amplifier
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Abstract
The invention discloses a wideband amplification device with low noise. The wideband amplification device comprises a single chip microcomputer, an A/D converter, a filter, a prime amplifier, a final amplifier, a power module and a liquid crystal display. The prime amplifier, the filter, the final amplifier, the A/D converter and the single chip microcomputer are sequentially connected. Input signals are connected with the prime amplifier through a potential-divider network. The final amplifier is further connected with the power module and a load. The value range of the load is within 50-60 ohms, and the single chip microcomputer is further connected with the liquid crystal display and a keyboard. Through the principle, output noise is low, measurement errors are reduced, work can be achieved through low voltage provided by a power source, and performance is more excellent.
Description
Technical field
The present invention relates to back noise amplifier, be specifically related to wideband low noise amplifying device.
Background technology
Wide-band amplifier, the i.e. amplifying circuit of the ratio of upper limit operation frequency and lower limit operating frequency much larger than 1, play very important effect in a communications system, be widely used in the circuit such as A/D converter, D/A converter, active filter, waveform generator, the video amplifier.Low noise amplifier is the amplifier that noise factor is very low, general as the high frequency of all kinds of radio receiver or the amplifying circuit of intermediate-frequency preamplifier and high sensitivity electron detection equipment, for nearly all radio-frequency receiving system, a requisite module is exactly low noise amplifier.The radiofrequency signal amplitude arrived due to system acceptance is usually very weak, and the noise of amplifier self may be very serious to the interference of signal, therefore wishes to reduce unnecessary noise in transmittance process, and provide certain voltage gain, to improve the signal to noise ratio of output.It is comparatively large to there is measure error in low noise amplifier of today, needs to provide larger power supply to work, and causes noise in output signal comparatively large, affects the quality of whole device.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, provide wideband low noise amplifying device, output noise is little, reduces measure error, and power supply provides small voltage also can realize work, and performance is more superior.
For solving above-mentioned technical problem, the present invention is by the following technical solutions: wideband low noise amplifying device, comprise single-chip microcomputer, A/D converter, filter, pre-amplifier, final amplifier, power module and liquid crystal display, described pre-amplifier, filter, final amplifier, A/D converter are connected successively with single-chip microcomputer, and input signal is connected with pre-amplifier by potential-divider network; Described final amplifier also connects power module and load simultaneously, and the magnitude range of load is between 50-60 Europe; Described single-chip microcomputer goes back connecting fluid crystal display and keyboard.
The model of described power module is TPS61087.DC-DC converter TPS61087 is wherein utilized 5 V photovoltaic conversion to be 18 V thus to power for final amplifier, thus realize utilizing small electric source voltage also can realize work, reduce the noise exported on power module, make the signal of output more clear further.
The model of described pre-amplifier is OPA820.Adopt anti-phase input method to improve passband, can by low level signal amplification 12 times.
The model of described final amplifier is THS3091.Adopt unity gain stable low-noise operational amplifier OPA820 as pre-amplifier, filter is also set between pre-amplifier and final amplifier in order to filtering unwanted signal, and then filtered useful signal is amplified again as final amplifier by high speed amplifier THS3091, thus reduce the noise of output signal.Final stage is amplified with high speed amplifier THS3091 realization, and can make frequency band under the prerequisite of 20 Hz ~ 10 MHz, overall gain reaches 140 times, effectively raises the performance of this amplifier.
The model of described single-chip microcomputer is MSP430F449.The measurement of this chip microcontroller peak-to-peak value, and shown by liquid crystal display, observe intuitively more convenient.And the using method of this single-chip microcomputer is identical with prior art using method.
The model of described A/D converter is ADS803.Adopt 12 high-speed a/d converter ADS803 to achieve and measure and the function of numerical monitor amplifier output voltage peak-to-peak value, measure error is reduced.
Compared with prior art, the invention has the beneficial effects as follows:
1, pre-amplifier of the present invention adopts OPA820, and adopts anti-phase input method to improve passband, can by low level signal amplification 12 times; Final stage is amplified with high speed amplifier THS3091 realization, can make frequency band under the prerequisite of 20 Hz ~ 10 MHz, overall gain reaches 140 times, under the prerequisite meeting primary demand, employing two-stage is amplified, and avoids adding too much amplifying stage and can introduce larger noise, reduce measure error, ensure the clear of output signal, performance gets a promotion.
2, the power module model in the present invention is TPS61087,5 V photovoltaic conversion can be 18 V thus power for final amplifier, thus realize utilizing small electric source voltage also can realize work, reduce the noise exported on power module, make the signal of output more clear further, improve performance.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated, and embodiments of the invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, the present invention includes wideband low noise amplifying device, comprise single-chip microcomputer, A/D converter, filter, pre-amplifier, final amplifier, power module and liquid crystal display, described pre-amplifier, filter, final amplifier, A/D converter are connected successively with single-chip microcomputer, and input signal is connected with pre-amplifier by potential-divider network.Described final amplifier also connects power module and load simultaneously, and the magnitude range of load is between 50-60 Europe; Described single-chip microcomputer goes back connecting fluid crystal display and keyboard.The model of described power module is TPS61087.
The present invention is made up of prime amplification, voltage transitions, power amplification and peak detection 4 part.Signal source output signal is become peak-to-peak value 30 mV small-signal by potential-divider network by input.Consider that multistage amplification can introduce larger noise, system only adopts two-stage to amplify.Between pre-amplifier and final amplifier, also arrange filter, reduce output noise, avoid adding too much amplifying stage and can introduce larger noise, reduce measure error, ensure the clear of output signal, performance gets a promotion.
Embodiment 2:
The present embodiment preferred concrete structure on the basis of embodiment 1 is as follows: the model of described pre-amplifier is OPA820.The model of described final amplifier is THS3091.The model of described single-chip microcomputer is MSP430F449.The model of described A/D converter is ADS803.Prime amplifies employing OPA820, and adopts anti-phase input method to improve passband, can by low level signal amplification 12 times.Final stage is amplified with high speed amplifier THS3091 realization, and can make frequency band under the prerequisite of 20 Hz ~ 10 MHz, overall gain reaches 140 times.5 V photovoltaic conversion are that 18 V power to final stage THS3091 power amplifier module by TPS61087 power module.The measurement of peak-to-peak value is realized by program, and passes through liquid crystal display.
Just this invention can be realized as mentioned above.
Claims (6)
1. wideband low noise amplifying device, it is characterized in that: comprise single-chip microcomputer, A/D converter, filter, pre-amplifier, final amplifier, power module and liquid crystal display, described pre-amplifier, filter, final amplifier, A/D converter are connected successively with single-chip microcomputer, and input signal is connected with pre-amplifier by potential-divider network; Described final amplifier also connects power module and load simultaneously, and the magnitude range of load is between 50-60 Europe; Described single-chip microcomputer goes back connecting fluid crystal display and keyboard.
2. wideband low noise amplifying device according to claim 1, is characterized in that: the model of described power module is TPS61087.
3. wideband low noise amplifying device according to claim 1, is characterized in that: the model of described pre-amplifier is OPA820.
4. wideband low noise amplifying device according to claim 1, is characterized in that: the model of described final amplifier is THS3091.
5. wideband low noise amplifying device according to claim 1, is characterized in that: the model of described single-chip microcomputer is MSP430F449.
6. wideband low noise amplifying device according to claim 1, is characterized in that: the model of described A/D converter is ADS803.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410549520.8A CN104242831A (en) | 2014-10-17 | 2014-10-17 | Wideband amplification device with low noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410549520.8A CN104242831A (en) | 2014-10-17 | 2014-10-17 | Wideband amplification device with low noise |
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| Publication Number | Publication Date |
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| CN104242831A true CN104242831A (en) | 2014-12-24 |
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| CN201410549520.8A Pending CN104242831A (en) | 2014-10-17 | 2014-10-17 | Wideband amplification device with low noise |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707205A (en) * | 2017-10-26 | 2018-02-16 | 成都西井科技有限公司 | low-frequency power amplifier |
| CN107809219A (en) * | 2017-10-26 | 2018-03-16 | 成都西井科技有限公司 | The adjustable low-frequency power amplifier of attenuation amplitude |
| CN109471019A (en) * | 2018-12-14 | 2019-03-15 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | A kind of power supply chip low-noise characteristic test device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0279605A (en) * | 1988-09-16 | 1990-03-20 | Matsushita Electric Ind Co Ltd | Audio amplifier |
| CN201691917U (en) * | 2010-05-20 | 2011-01-05 | 西安交通大学 | USB-based portable network household electrocardiogram (ECG) monitor device |
| CN202026282U (en) * | 2011-03-30 | 2011-11-02 | 大连交通大学 | Numerical control gain direct current amplifier |
| CN203071878U (en) * | 2013-03-08 | 2013-07-17 | 滁州学院 | Wideband direct-current amplifier based on voltage-controlled operational amplifier |
| CN204156821U (en) * | 2014-10-17 | 2015-02-11 | 绵阳雷迪创微电子科技有限公司 | Wideband low noise amplifier |
-
2014
- 2014-10-17 CN CN201410549520.8A patent/CN104242831A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0279605A (en) * | 1988-09-16 | 1990-03-20 | Matsushita Electric Ind Co Ltd | Audio amplifier |
| CN201691917U (en) * | 2010-05-20 | 2011-01-05 | 西安交通大学 | USB-based portable network household electrocardiogram (ECG) monitor device |
| CN202026282U (en) * | 2011-03-30 | 2011-11-02 | 大连交通大学 | Numerical control gain direct current amplifier |
| CN203071878U (en) * | 2013-03-08 | 2013-07-17 | 滁州学院 | Wideband direct-current amplifier based on voltage-controlled operational amplifier |
| CN204156821U (en) * | 2014-10-17 | 2015-02-11 | 绵阳雷迪创微电子科技有限公司 | Wideband low noise amplifier |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707205A (en) * | 2017-10-26 | 2018-02-16 | 成都西井科技有限公司 | low-frequency power amplifier |
| CN107809219A (en) * | 2017-10-26 | 2018-03-16 | 成都西井科技有限公司 | The adjustable low-frequency power amplifier of attenuation amplitude |
| CN109471019A (en) * | 2018-12-14 | 2019-03-15 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | A kind of power supply chip low-noise characteristic test device |
| CN109471019B (en) * | 2018-12-14 | 2021-10-19 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | Power chip low noise characteristic testing arrangement |
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Application publication date: 20141224 |