CN208386501U - A kind of simple digital control high gain wideband amplifier device - Google Patents
A kind of simple digital control high gain wideband amplifier device Download PDFInfo
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- CN208386501U CN208386501U CN201821633554.5U CN201821633554U CN208386501U CN 208386501 U CN208386501 U CN 208386501U CN 201821633554 U CN201821633554 U CN 201821633554U CN 208386501 U CN208386501 U CN 208386501U
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- amplification circuit
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Abstract
A kind of simple digital control high gain wideband amplifier device, including programme-controlled gain amplifying circuit, pre-amplification circuit, passband selection circuit, power amplification circuit, single chip machine controlling circuit and power module, the programme-controlled gain amplifying circuit includes the voltage-type amplifier OPA690 circuit of two-stage fixed gain 6dB and 20dB, the passband selection circuit includes five rank Butterworth LPFs and seven rank Butterworth LPFs, the power amplification circuit includes current feedback operational amplifier AD811 and high speed current buffer BUF634, the power module includes the adjustable voltage stabilizing chip LM317 in the three ends and adjustable voltage stabilizing chip LM337 in three ends.This simple digital control high gain wideband amplifier device can complete that 0~80dB gain stepping adjustable function in 0~10MHz frequency range, low noise, input impedance be low and the undistorted phenomenon of signal output waveform.
Description
Technical field
The utility model relates to electronic measuring technology fields, and in particular to a kind of simple digital control high-gain broadband amplification
Device device.
Background technique
Amplifier is a kind of device that voltage signal or current signal can be amplified, and be can be realized in electricity
Signal and power amplification are widely used in the various electronic equipments such as communication, broadcast, radar, TV and automatic control.Amplifier
It is also an indispensable part in modern measuring instrument, the sensitivity of instrument is higher, and noise requirements are lower, more needs high increasing
Benefit, high-performance, the amplifier of low noise.By the actual functional capability of instrument and the difference of requirement, the requirement to amplifying circuit is also different
Sample, such as the bandwidth of amplifier, gain height, the height etc. of input and output impedance.Therefore a kind of broadband of high-gain is needed to put
Big device has the characteristics that high gain, input impedance be low and long bandwidth.
Utility model content
The purpose of the utility model is to overcome above-mentioned the deficiencies in the prior art, provide that a kind of high-gain is high, input impedance
The voltage broadband amplifier installation of low, long bandwidth and low noise.
To achieve the goals above, the utility model adopts the technical scheme that
A kind of simple digital control high gain wideband amplifier device, including programme-controlled gain amplifying circuit, preposition amplification electricity
Road, passband selection circuit, power amplification circuit, single chip machine controlling circuit and power module, the programme-controlled gain amplification electricity
Road includes the voltage-type amplifier OPA690 circuit of two-stage fixed gain 6dB and 20dB, and the passband selection circuit includes five ranks
Butterworth LPF and seven rank Butterworth LPFs, the power amplification circuit include current feedback operation
Amplifier AD811 and high speed current buffer BUF634, the power module include the adjustable voltage stabilizing chip LM317 in three ends and three ends
Adjustable voltage stabilizing chip LM337, the programme-controlled gain amplifying circuit, pre-amplification circuit, passband selection circuit and power are put
The input terminal of big circuit is electrically connected with the output end of single chip machine controlling circuit, the output end and single-chip microcontroller of the power module
The input terminal of control circuit is electrically connected.
It is as above-mentioned technical proposal to further describe:
The output end of the programme-controlled gain amplifying circuit and the input terminal of pre-amplification circuit are electrically connected.
It is as above-mentioned technical proposal to further describe:
The output end of the pre-amplification circuit and the input terminal of passband selection circuit are electrically connected.
It is as above-mentioned technical proposal to further describe:
The output end of the passband selection circuit and the input terminal of power amplification circuit are electrically connected.
The beneficial effects of the utility model are as follows:
This simple digital control high gain wideband amplifier device can complete 0~80dB in 0~10MHz frequency range
Gain stepping adjustable function, low noise, input impedance be low and the undistorted phenomenon of signal output waveform.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of simple digital control high gain wideband amplifier device of the utility model；
Fig. 2 is the circuit diagram of program-controlled gain amplifying circuit in the utility model；
Fig. 3 is the circuit diagram of pre-amplification circuit in the utility model；
Fig. 4 is the circuit diagram of passband selection circuit in the utility model；
Fig. 5 is the circuit diagram of power amplification circuit in the utility model；
Fig. 6 is the circuit diagram of power module in the utility model.
Marginal data:
1- programme-controlled gain amplifying circuit, 2- pre-amplification circuit, 3- passband selection circuit, 4- power amplification circuit, 5-
Single chip machine controlling circuit, 6- power module.
Specific embodiment
Referring to Fig. 1-6, a kind of simple digital control high gain wideband amplifier device, including programme-controlled gain amplifying circuit 1,
Pre-amplification circuit 2, passband selection circuit 3, power amplification circuit 4, single chip machine controlling circuit 5 and power module 6, it is program-controlled
Gain amplifying circuit 1 includes the voltage-type amplifier OPA690 circuit of two-stage fixed gain 6dB and 20dB, passband selection circuit 3
Including five rank Butterworth LPFs and seven rank Butterworth LPFs, power amplification circuit 4 includes current feedback
Type operational amplifier AD811 and high speed current buffer BUF634, power module 6 include the adjustable voltage stabilizing chip LM317 in three ends and
Three ends are adjustable voltage stabilizing chip LM337, programme-controlled gain amplifying circuit 1, pre-amplification circuit 2, passband selection circuit 3 and power
The input terminal of amplifying circuit 4 is electrically connected with the output end of single chip machine controlling circuit 5, the output end and monolithic of power module 6
The input terminal of machine control circuit 5 is electrically connected.
The output end of the programme-controlled gain amplifying circuit 1 and the input terminal of pre-amplification circuit 2 are electrically connected；It is described preposition
The output end of amplifying circuit 2 and the input terminal of passband selection circuit 3 are electrically connected；The output of the passband selection circuit 3
End and the input terminal of power amplification circuit 4 are electrically connected.
In the present embodiment, referring to fig. 2, in programme-controlled gain amplifying circuit 1, inverting input terminal of the input signal from VCA810
Input, resistance R1 is used for impedance matching, while meeting the requirement of 50 Ω of input resistance, in order to inhibit Zero drift in main amplifier,
VCA810 non-inverting input terminal is returned to zero with potentiometer R2；After power supply is filtered by magnetic bead, using 10uF capacitor and 0.1uF capacitor
Parallel connection is filtered, and 10uF capacitor utmostly reduces for filtering out low-frequency noise, 0.1uF capacitor for filtering out high-frequency noise
Influence of the power supply to circuit controls the conducting of triode Q1 by single-chip microcontroller to control relay U3, it is manual to can choose gain
Continuously adjustable or stepping is adjustable；When selection is continuously adjustable manually, voltage gain is adjusted by adjusting the size of R8；It is elected
Select stepping can timing, DC voltage is exported by the DAC of single-chip microcontroller, voltage follower is first passed around and carries out impedance transformation, by DAC
Output impedance become low output impedance, then pass through level-one subtraction circuit, the output voltage of DAC be subjected to dipole inversion, will
The positive voltage of DAC output is transformed to -2V~0V negative voltage to control the voltage gain of VCA810.
In the present embodiment, referring to Fig. 3, in pre-amplification circuit 2, after VCA810 programming amplifying, two-stage is devised
The pre-amplification circuit of fixed gain 6dB and 20dB, circuit constitute reverse amplification circuit by voltage-type amplifier OPA690 and form, the
Level-one amplification factor by R13 and R11 determine circuit voltage gain be R11/R13=2 times, i.e. 6dB, second level amplification factor by
R14 and R12 determines that the voltage gain of circuit is R12/R14=10 times, i.e. 20dB；With 1 class of programme-controlled gain amplifying circuit of prime
Seemingly, it also joined drift compensating circuit, by adjusting the size of potentiometer R3 and R6, the null offset that can solve circuit is asked
Topic.
In the present embodiment, referring to fig. 4, passband selection circuit 3 uses two relays in order to preset passband, system
Device U1 and U2 realize the switching of passband, 50 Ω resistors match of filter, so via filtering net for switching filter network
The signal of network has the decaying of 6dB.
In the present embodiment, referring to Fig. 5, power amplification circuit 4 is by current feedback operational amplifier AD811 and high speed electric current
Buffer BUF634 is constituted, and ± 18V power supply power supply both can be used, wherein current feedback operational amplifier AD811 has
The high pressure Slew Rate of 2500V/ μ s is able to satisfy required output voltage requirement, current feedback operational amplifier in the design completely
Fixed 10 times of the amplification of AD811, bandwidth at this time are up to 100MHz, and the bandwidth of high speed current buffer BUF634 is 30MHz, pressure pendulum
Rate is also up to 2000V/ μ s, and output electric current is 250mA, in order to realize high output voltage and drive 50 Ω load resistances, the circuit
It is in parallel using 4 high speed current buffer BUF634.
In the present embodiment, referring to Fig. 6, which is D.C. regulated power supply, and alternating voltage after transformer via inputting
To rectifier bridge D3, then positive voltage is input to the input terminal of the adjustable voltage stabilizing chip LM317 in three ends, and it is adjustable that negative voltage is input to three ends
The input terminal of voltage stabilizing chip LM337, the capacitor in figure is filter capacitor, and inductance is filter inductance, and resistance R3 and R4 are respectively used to
Adjust positive negative output voltage size.
The utility model uses core device of the MSP430G2553 as control core, using VCA810 as programme-controlled gain
Part, core devices of the high speed current buffer BUF634 as power amplification realize output voltage amplitude requirement；
The utility model mainly includes six module compositions: programme-controlled gain amplifying circuit 1, pre-amplification circuit 2, passband
Selection circuit 3, power amplification circuit 4, single chip machine controlling circuit 5 and power module 6.The gain adjustment range of system are as follows: 0~
80dB, wherein the programme-controlled gain amplifying circuit 1 being made of VCA810 is able to achieve -40dB~40dB adjustable range；Preposition amplification
Circuit 2 is made of OPA690, fixed amplification 26dB；Passband selection circuit 3 is made of two Butterworth filters, for selecting
Select the passband of system；Power amplification circuit 4 amplifies 20dB by current feedback operational amplifier AD811 is fixed, then by multi-disc
High speed current buffer BUF634 parallel output, for expanding output electric current；Power module provides power supply to whole system；Monolithic
Control core of the machine control circuit 5 as system, can be by the gain size and passband of key prewired circuit, and passes through liquid crystal
It shows.
The above is only the preferred embodiment of the utility model, and the protection scope of the utility model is not limited merely to
Above-described embodiment, technical solution belonging to the idea of the present invention belong to the protection scope of the utility model.It should refer to
Out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and
Retouching, these improvements and modifications also should be regarded as the protection scope of the utility model.
Claims (4)
1. a kind of simple digital control high gain wideband amplifier device, including programme-controlled gain amplifying circuit (1), preposition amplification electricity
Road (2), passband selection circuit (3), power amplification circuit (4), single chip machine controlling circuit (5) and power module (6), it is special
Sign is that the programme-controlled gain amplifying circuit (1) includes the voltage-type amplifier OPA690 electricity of two-stage fixed gain 6dB and 20dB
Road, the passband selection circuit (3) include five rank Butterworth LPFs and seven rank Butterworth LPFs, institute
Stating power amplification circuit (4) includes current feedback operational amplifier AD811 and high speed current buffer BUF634, the power supply
Module (6) includes the adjustable voltage stabilizing chip LM317 in the three ends and adjustable voltage stabilizing chip LM337 in three ends, the programme-controlled gain amplifying circuit
(1), the input terminal of pre-amplification circuit (2), passband selection circuit (3) and power amplification circuit (4) with single-chip microcontroller control
The output end of circuit (5) processed is electrically connected, the output end of the power module (6) and the input terminal of single chip machine controlling circuit (5)
It is electrically connected.
2. a kind of simple digital control high gain wideband amplifier device according to claim 1, it is characterised in that: described
The output end of programme-controlled gain amplifying circuit (1) and the input terminal of pre-amplification circuit (2) are electrically connected.
3. a kind of simple digital control high gain wideband amplifier device according to claim 1, it is characterised in that: described
The output end of pre-amplification circuit (2) and the input terminal of passband selection circuit (3) are electrically connected.
4. a kind of simple digital control high gain wideband amplifier device according to claim 1, it is characterised in that: described
The output end of passband selection circuit (3) and the input terminal of power amplification circuit (4) are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821633554.5U CN208386501U (en) | 2018-10-09 | 2018-10-09 | A kind of simple digital control high gain wideband amplifier device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821633554.5U CN208386501U (en) | 2018-10-09 | 2018-10-09 | A kind of simple digital control high gain wideband amplifier device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208386501U true CN208386501U (en) | 2019-01-15 |
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ID=64961593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821633554.5U Expired - Fee Related CN208386501U (en) | 2018-10-09 | 2018-10-09 | A kind of simple digital control high gain wideband amplifier device |
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|---|---|
| CN (1) | CN208386501U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110812693A (en) * | 2019-09-27 | 2020-02-21 | 中国科学院心理研究所 | Multichannel high-frequency non-invasive accurate positioning nerve stimulation system |
| CN111323828A (en) * | 2020-04-02 | 2020-06-23 | 中国海洋大学 | Program-controlled gain type ocean electric field signal acquisition method, system, device and application |
-
2018
- 2018-10-09 CN CN201821633554.5U patent/CN208386501U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110812693A (en) * | 2019-09-27 | 2020-02-21 | 中国科学院心理研究所 | Multichannel high-frequency non-invasive accurate positioning nerve stimulation system |
| CN110812693B (en) * | 2019-09-27 | 2021-08-03 | 中国科学院心理研究所 | Multichannel high-frequency non-invasive accurate positioning nerve stimulation system |
| CN111323828A (en) * | 2020-04-02 | 2020-06-23 | 中国海洋大学 | Program-controlled gain type ocean electric field signal acquisition method, system, device and application |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190115 Termination date: 20191009 |
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| CF01 | Termination of patent right due to non-payment of annual fee |