CN207218648U - Adaptive amplifying circuit based on reception signal detection - Google Patents
Adaptive amplifying circuit based on reception signal detection Download PDFInfo
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Abstract
The utility model discloses a kind of adaptive amplifying circuit based on reception signal detection, it is related to ranging receiving circuit technical field.The adaptive amplifying circuit includes single-ended signal to differential signal translation circuit, and the input of single-ended signal to differential signal translation circuit is the input of adaptive amplifying circuit；Single-ended signal connects to the differential signal outputs of differential signal translation circuit and the differential signal input of gain-changeable amplifier circuit；The differential signal outputs of gain-changeable amplifier circuit are divided into two-way, the first via is connected with the input of differential signal to single-ended signal translation circuit, second tunnel is connected with the input of broadband demodulation and translation circuit, the control terminal connection of the output end and gain-changeable amplifier circuit of broadband demodulation and translation circuit, the output end of differential signal to single-ended signal translation circuit are the output end of adaptive amplifying circuit.The adaptive amplifying circuit have the advantages that gain adjustment range is big, precision is high, noise is low, with roomy.
Description
Technical field
Ranging receiving circuit technical field is the utility model is related to, more particularly to it is a kind of based on the adaptive of reception signal detection
Answer amplifying circuit.
Background technology
Ranging receiving circuit mainly includes adaptive amplification circuit module, low-pass filter circuit module and high speed sampling circuit
Module forms, for completing adaptive amplification, noise suppressed and high-speed data to weak echo signal in electro-optical distance measurement system
Sampling, technical support is provided for location algorithm.During the operation of receiver of reality, if measured signal is too small, do not reach
The 1/3 of ADC converter ranges, can lose certain precision, and be unfavorable for observing, and therefore, must there is high-performance in circuit
Amplifying element.On the other hand, because the attenuation coefficient of front end passive attenuation network is fixed, transkit attenuation often occurs
The problem of, it is also desirable to the amplifying element.In order under conditions of high range accuracy is ensured, realize Larger Dynamic scope ranging, it is necessary to
Using echo（Main ripple）The automatic growth control of signal.The general relatively low and gain control of amplifying circuit control accuracy of the prior art
Mode processed is dumb.
Utility model content
Technical problem to be solved in the utility model is how to provide that a kind of control accuracy is high, gain control mode is flexible
The adaptive amplifying circuit based on reception signal detection.
In order to solve the above technical problems, technical solution adopted in the utility model is：One kind is based on reception signal detection
Adaptive amplifying circuit, it is characterised in that：Including single-ended signal to differential signal translation circuit, variable gain amplifier electricity
Road, differential signal to single-ended signal translation circuit and broadband demodulation and translation circuit, the single-ended signal to differential signal become
The input for changing circuit is the input of the adaptive amplifying circuit, and the single-ended signal is used for differential signal translation circuit
The single-ended signal of input is converted into differential signal to be exported；The difference of the single-ended signal to differential signal translation circuit is believed
Number output end is connected with the differential signal input of the gain-changeable amplifier circuit, and the gain-changeable amplifier circuit is used
Signal is amplified under wide dynamic range of gains control in realizing；The differential signal of the gain-changeable amplifier circuit is defeated
Go out end and be divided into two-way, the first via is connected with the input of the differential signal to single-ended signal translation circuit, the second tunnel with it is described
The input of broadband demodulation and translation circuit is connected, and the output end of the broadband demodulation and translation circuit is put with the variable gain
The control terminal connection of big device circuit, the output end of the differential signal to single-ended signal translation circuit is the adaptive amplification electricity
The output end on road, the differential signal to single-ended signal translation circuit enter for the differential signal of input to be converted into single-ended signal
Row output, the broadband demodulation and translation circuit are used to directly examine the differential output signal of gain-changeable amplifier circuit
Ripple, and according to the gain of the data of detection control gain-changeable amplifier circuit.
Further technical scheme is：The single-ended signal drives to differential signal translation circuit including AD8131 molded breadths band
Dynamic chip, 1 pin of the AD8131 are grounded through resistance R1, the 2 foot meridian capacitor C1 ground connection of the AD8131, and the 3 of the AD8131
Pin is divided into four tunnels, and the first via is grounded through electric capacity C2, and the second tunnel is grounded through electric capacity C3, and the 3rd tunnel is grounded through electric capacity C4, the 4th tunnel with+
5V power supplys connect, and 4 pin of the AD8131 export for a differential signal of the single-ended signal to differential signal translation circuit
End, 5 pin of the AD8131 are another differential signal outputs of the single-ended signal to differential signal translation circuit, described
AD8131 6 pin are divided into four tunnels, and the first via is grounded through electric capacity C5, and the second tunnel is grounded through electric capacity C6, and the 3rd tunnel is grounded through electric capacity C7,
4th tunnel is connected with -5V power supplys, and 7 pin of the AD8131 are hanging, and 8 pin of the AD8131 are divided into two-way, and the first via is described
To the input of differential signal translation circuit, the second tunnel is grounded single-ended signal through resistance R2.
Further technical scheme is：The gain-changeable amplifier circuit includes AD8330 type amplification chips, described
AD8330 OFST is grounded after drawing foot meridian capacitor C8；The ENBL pins of the AD8330 are divided into two-way, and the first via connects through electric capacity C9
Ground, the second tunnel are connected through resistance R3 with 5V power supplys, VPOS the and VPS1 pins of the AD8330 and the ENBL of the AD8330
Pin connects, and the INHI pins of the AD8330 are a differential signal input of the gain-changeable amplifier circuit, should
Differential signal input is connected through electric capacity C19 with 4 pin of the AD8131, and the INLO pins of the AD8330 are the variable increasing
Another differential signal input of beneficial amplifier circuit, 5 pin of the differential signal input through electric capacity C20 Yu the AD8131
Connection, the MODE pins ground connection of the AD8330, the VDBS pins of the AD8330 are the gain-changeable amplifier circuit
One control signal input, CMGN, COMM and CMOP pin ground connection of the AD8330, the VMAG pins of the AD8330
For another control signal of the gain-changeable amplifier circuit, the OPLO pins of the AD8330 are the variable gain
One differential signal outputs of amplifier circuit, the OPHI pins of the AD8330 are the gain-changeable amplifier circuit
Another differential signal outputs, the VPSO pins of the AD8330 are divided into two-way, and the first via is grounded through electric capacity C10, the second tunnel
5V power supplys are connect through resistance R4, the CNTR pins of the AD8330 connect 2.5V power supplys.
Further technical scheme is：The broadband demodulation and translation circuit include AD8362 type detection chips, described
AD8362 1 pin ground connection, the 2 foot meridian capacitor C11 ground connection of the AD8362,3 pin of the AD8362 connect 2.5V power supplys, described
AD8362 4 pin are a differential signal input of the broadband demodulation and translation circuit, and the differential signal input meets institute
AD8330 OPHI pins are stated, 5 pin of the AD8362 are defeated for another differential signal of the broadband demodulation and translation circuit
Enter end, the differential signal input connects the OPLO pins of the AD8330, and 6 pin of the AD8362 connect 2.5V power supplys, described
AD8362 7 pin are divided into two-way, and the first via connects 2.5V power supplys, the second tunnel ground connection through electric capacity C12, and 8 pin of the AD8362 are grounded,
The 9 foot meridian capacitor C13 of the AD8362 are connected with 10 pin of the AD8362, the 10 pin ground connection of the AD8362, described
AD8362 11 pin are grounded after resistance R5, resistance R6 successively after being connected with 12 pin, and the VDBS pins of the AD8330 connect described
Resistance R5 and resistance R6 node, 13 pin of the AD8362 are divided into two-way, and the first via connects 5V power supplys, the second road warp through resistance R7
Electric capacity C14 is grounded, and 14 pin of the AD8362 are connected after being connected with 15 pin with the VMAG pins of the AD8330, the AD8362
16 pin ground connection.
Further technical scheme is：The differential signal includes two AD8056 to single-ended signal translation circuit and amplified
Device chip, the OPHI that a differential signal input of the differential signal to single-ended signal translation circuit meets the AD8330 draw
Pin, the differential signal input are divided into two-way after electric capacity C15 and resistance R8 successively, and the first via is anti-with first AD8056's
Phase signals input is connected, and output end of second tunnel with first AD8056 after resistance R9 is connected；The differential signal is to singly
Another differential signal input of end signal translation circuit connects the OPLO pins of the AD8330, the differential signal input according to
Secondary to be divided into two-way after electric capacity C16 and resistance R10, the first via is connected with first AD8056 in-phase signal input, the
Two tunnels are grounded through resistance R11；First AD8056 second AD8056 of output termination in-phase input end, second AD8056
Output end be divided into three tunnels, the first via is connected with second AD8056 inversion signal input, and the second tunnel connects through resistance R12
Ground, the 3rd tunnel are output end of the differential signal to single-ended signal translation circuit.
Further technical scheme is：One differential signal of the differential signal to single-ended signal translation circuit inputs
End is divided into two-way after electric capacity C17, and first via ground connection, the second tunnel becomes after electric capacity C18 with the differential signal to single-ended signal
Change another differential signal input of circuit.
It is using beneficial effect caused by above-mentioned technical proposal：The adaptive amplifying circuit arrives including single-ended signal
Differential signal translation circuit, gain-changeable amplifier circuit, differential signal to single-ended signal translation circuit and broadband demodulation and
Translation circuit, the single-ended signal to differential signal translation circuit are used to the single-ended signal of input being converted to differential signal progress
Output；The broadband demodulation and translation circuit are used to directly examine the differential output signal of gain-changeable amplifier circuit
Ripple, and according to the gain of the data of detection control gain-changeable amplifier circuit；The differential signal converts electricity to single-ended signal
Road is exported for the differential signal of input to be converted into single-ended signal, and the adaptive amplifying circuit has Gain tuning model
Enclose big, precision is high, noise is low, with it is roomy the advantages that.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the theory diagram of adaptive amplifying circuit described in the utility model embodiment；
Fig. 2 is the schematic diagram of adaptive amplifying circuit described in the utility model embodiment；
Fig. 3 is the schematic diagram of adaptive amplifying circuit described in the utility model embodiment（With numerical value）；
Fig. 4 is the output noise of AD8330 in the utility model embodiment with gain-controlled voltage VDBSGraph of a relation.
Embodiment
With reference to the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu, it is fully described by, it is clear that described embodiment is only part of the embodiment of the present utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Many details are elaborated in the following description in order to fully understand the utility model, but this practicality is new
Type can also be different from other manner described here using other to be implemented, and those skilled in the art can be without prejudice to this reality
With doing similar popularization in the case of new intension, therefore the utility model is not limited by following public specific embodiment.
As shown in figure 1, the utility model embodiment discloses a kind of adaptive amplifying circuit based on reception signal detection,
Including single-ended signal to differential signal translation circuit, gain-changeable amplifier circuit, differential signal to single-ended signal translation circuit
And broadband demodulation and translation circuit.The input of the single-ended signal to differential signal translation circuit is the adaptive amplification
The input of circuit, the single-ended signal to differential signal translation circuit are used to the single-ended signal of input being converted to differential signal
Exported；Differential signal outputs and variable gain amplifier electricity of the single-ended signal to differential signal translation circuit
The differential signal input connection on road, it is right under wide dynamic range of gains control that the gain-changeable amplifier circuit is used for realization
Signal is amplified；The differential signal outputs of the gain-changeable amplifier circuit are divided into two-way, the first via and the difference
The input of signal to single-ended signal translation circuit connects, and the second tunnel connects with the input of the broadband demodulation and translation circuit
Connect, the output end of the broadband demodulation and translation circuit is connected with the control terminal of the gain-changeable amplifier circuit, the difference
The output end of sub-signal to single-ended signal translation circuit is the output end of the adaptive amplifying circuit, and the differential signal is to singly
End signal translation circuit is exported for the differential signal of input to be converted into single-ended signal, the broadband demodulation and conversion electricity
Road is used to carry out the differential output signal of gain-changeable amplifier circuit direct detection, and variable according to the control of the data of detection
The gain of gain amplifier circuit.
The basic composition of gain control circuit based on variable gain amplifier AD8330, principle as shown in Figure 1-Figure 3, electricity
Pressure amplifying circuit use AD8330 variable gain amplifiers, it have the characteristics that gain adjustment range greatly, low noise, wide bandwidth,
The key technical indexes is as shown in table 1.
The major parameter of the AD8330 amplifying circuits of table 1
AD8330 gain is with controlling the relation of terminal voltage：。
VDBSFor gain control end voltage, input range 0 ~ 1.5V, corresponding AD8330 gain are 0 ~ 50dB,
AD8330 output noise is with gain-controlled voltage VDBSRelation it is as shown in Figure 4.It can be seen that with gain control
Voltage V processedDBSIncrease, the exponential increase of output noise.In order to ensure signal to noise ratio, general gain-controlled voltage when using is not
1.2V is can exceed that, corresponding gain is within 100 dB.Because AD8330 is the amplifier of Differential Input, difference output, so
Forward and backward level carries out single-ended-to-difference, differential-to-single-ended conversion using AD8131 and AD8056.
AD8330 requires single supply (+5V) power supply, Differential Input, difference output.Need first to be converted into single-ended signal
Then differential signal accesses AD8330 and is amplified again.In the process, in order to obtain enough dynamic ranges, it is also necessary to by difference
The common-mode voltage of sub-signal is arranged on 2.5V, that is, is set in the midpoint of AD8330 supply voltages.
AD8131 is a difference or single ended input, the broad-band driver of difference output, only needs two equivalent external electricals
Hinder the level shifting circuit with regard to unit gain can be obtained.AD8131 has good pass band performance, and-three dB bandwidth can reach
400MHz, the small harmonic distortion of noise are low.Its outstanding advantages are that input form is flexible, it is possible to achieve single ended input difference is defeated
Go out, and the common-mode voltage of differential output signal can be conveniently set up, therefore the application selects AD8131 as single-ended variation
The driver divided.
Specifically, as shown in Fig. 2 the single-ended signal includes AD8131 molded breadths band driving core to differential signal translation circuit
Piece, 1 pin of the AD8131 are grounded through resistance R1, the 2 foot meridian capacitor C1 ground connection of the AD8131,3 pin point of the AD8131
For four tunnels, the first via is grounded through electric capacity C2, and the second tunnel is grounded through electric capacity C3, and the 3rd tunnel is grounded through electric capacity C4, the 4th tunnel and+5V electricity
Source connects, and 4 pin of the AD8131 are the single-ended signal a to differential signal outputs of differential signal translation circuit, institute
5 pin for stating AD8131 are another differential signal outputs of the single-ended signal to differential signal translation circuit, described
AD8131 6 pin are divided into four tunnels, and the first via is grounded through electric capacity C5, and the second tunnel is grounded through electric capacity C6, and the 3rd tunnel is grounded through electric capacity C7,
4th tunnel is connected with -5V power supplys, and 7 pin of the AD8131 are hanging, and 8 pin of the AD8131 are divided into two-way, and the first via is described
To the input of differential signal translation circuit, the second tunnel is grounded single-ended signal through resistance R2.
This application claims in the range of tested low level signal amplification to 1Vpp, to meet the input model of rear end ADC converters
Enclose, highest-gain needs 45dB or so.It is usually to be used in the case where small-signal inputs in view of highest-gain, now inputs
The amplitude of signal is in the range of several millivolts to tens millivolts, and the random noise in circuit can produce to signal quality in this case
Large effect, it requires that amplifier has higher signal to noise ratio.In addition, should be consistent with approximation under different gains
Frequency characteristic.Otherwise, when carrying out change in gain, same signal has different amplification results.General amplifier has constant
Gain bandwidth product, when gain is larger, pass band can decline, thus amplifying circuit design when need reserve enough
Surplus make to remain under higher gain to meet bandwidth requirement, therefore conventional method need to typically use multistage amplification, by larger increasing
Beneficial value is assigned to multistage amplifier circuit to realize.
The AD8330 chips of ADI companies are a DC to 150MHz adaptive-bandwidth gain amplifiers, gain ranging be 0dB extremely
50dB, gain linearity degree representative value is within ± 0.1dB.One outstanding advantages of the chip are its passbands under all gains
Width is all substantially constant at 150MHz, is adapted to require answering for fully differential signal path, low noise, explication gain and low distortion
With.Peak-to-peak value Differential Input dynamic range is ± 2V, it is allowed to which the sine wave of 1V root mean square (rms) is with well-to-do headroom work
Make, difference output resistance is 150 Ω, therefore main enlarging function coincident circuit design objective is theoretically realized using AD8330
It is required that.
Fig. 2 gives the specific type of attachment of the gain-changeable amplifier circuit.AD8330 output signals gain (with
DB is unit) with the voltage linear function on AD8330 VDBS pins, when MODE pins are hanging or connect high level,
And when gain-controlled voltage changes in the range of 0V to 1.5V, yield value is increased continuously to 50dB from 0dB, its linear relationship
Slope is 30mV/dB.When MODE pins are grounded, and when gain-controlled voltage changes in the range of 0V to 1.5V, yield value
It is continuously reduced from 50dB to 0dB, its slope is -30mV/dB, and the application have selected the former control mode.It is larger in order to ensure
Dynamic range, the common-mode voltage of its output difference signal have been arranged on the half of supply voltage by CNTR pins（2.5V）, core
Piece enable pin ENBL is fixed on high level.Input stage has carried out good decoupling with output stage power supply, and in circuit board wiring
When input, output pin also isolated by property-line, with prevent output signal to input small-signal crosstalk.
AD8330 gain is mainly by two pin controls of VDBS and VMAG, and VDBS is logarithm majorzation pin, and VMAG is line
Property controlling switch.Mode of operation pin MODE high level, log gain adjustment pin VDBS and gain positive correlation, 0~1.5V pairs
0~50 dB wide dynamic gain modification scope is answered, and the Effective Regulation voltage range of VMAG pins is between 0.015~5V.
By the co- controlling to two pins of VDBS and VMAG, the main wide dynamic range for putting the dB of -30dB~70 can be realized
Gain controls.AD8330 output voltage range is determined by the voltage Vmag of Vmag control terminals, always between 0 ~ 2Vmag, is
Make the signal voltage that AD8330 is exported remote and closely all bigger, it is impossible to VMAG is selected as control terminal, and
The voltage of VMAG control terminals is sufficiently large.On the other hand, the voltage of VMAG control terminals is higher, AD8330 permission input voltage model
Enclose it is smaller, otherwise signal can saturation, so choose VMAG control terminals voltage to consider.Cause because target range changes
Reception signal excursion it is bigger, fixed VMAG may be selected, and the gain of whole circuit is adjusted by changing VDBS.
Specifically, as shown in Figures 2 and 3, the gain-changeable amplifier circuit includes AD8330 type amplification chips, described
AD8330 OFST is grounded after drawing foot meridian capacitor C8；The ENBL pins of the AD8330 are divided into two-way, and the first via connects through electric capacity C9
Ground, the second tunnel are connected through resistance R3 with 5V power supplys, VPOS the and VPS1 pins of the AD8330 and the ENBL of the AD8330
Pin connects, and the INHI pins of the AD8330 are a differential signal input of the gain-changeable amplifier circuit, should
Differential signal input is connected through electric capacity C19 with 4 pin of the AD8131, and the INLO pins of the AD8330 are the variable increasing
Another differential signal input of beneficial amplifier circuit, 5 pin of the differential signal input through electric capacity C20 Yu the AD8131
Connection, the MODE pins ground connection of the AD8330, the VDBS pins of the AD8330 are the gain-changeable amplifier circuit
One control signal input, CMGN, COMM and CMOP pin ground connection of the AD8330, the VMAG pins of the AD8330
For another control signal of the gain-changeable amplifier circuit, the OPLO pins of the AD8330 are the variable gain
One differential signal outputs of amplifier circuit, the OPHI pins of the AD8330 are the gain-changeable amplifier circuit
Another differential signal outputs, the VPSO pins of the AD8330 are divided into two-way, and the first via is grounded through electric capacity C10, the second tunnel
5V power supplys are connect through resistance R4, the CNTR pins of the AD8330 connect 2.5V power supplys.
AD8362 is a kind of 60dB, 0 ~ 2.7GHz rms microwave detectors.AD8330 and AD8362 mutual cooperation, will
AD8362 is used for the direct detection to AD8330 differential output signals, and AD8362 detection output signal is used to control AD8330
Gain.Fig. 3 is the schematic diagram of automatic gain amplifying circuit, and according to circuit map parameter, 33mV/dB gain control can be achieved
System.In AD8362 peripheral circuit, time domain response uses 10nF capacitor, can correspond to the μ V ~ 1V of input range 10 rms.
It is pointed out that the gain-changeable amplifier circuit in Fig. 3 is for being also applicable when input signal is pulse signal.Cause
For, when input signal be discrete pulsed signal and echo pulse signal within the non-continuous time when, now may amplifier
Gain is very high, but AD8330 differential output signal is mainly what is be made up of common-mode voltage, and the difference amplifier through output stage becomes
For single-ended voltage signal when, range value or very little.
Specifically, as shown in Fig. 2 the broadband demodulation and translation circuit include AD8362 type detection chips, it is described
AD8362 1 pin ground connection, the 2 foot meridian capacitor C11 ground connection of the AD8362,3 pin of the AD8362 connect 2.5V power supplys, described
AD8362 4 pin are a differential signal input of the broadband demodulation and translation circuit, and the differential signal input meets institute
AD8330 OPHI pins are stated, 5 pin of the AD8362 are defeated for another differential signal of the broadband demodulation and translation circuit
Enter end, the differential signal input connects the OPLO pins of the AD8330, and 6 pin of the AD8362 connect 2.5V power supplys, described
AD8362 7 pin are divided into two-way, and the first via connects 2.5V power supplys, the second tunnel ground connection through electric capacity C12, and 8 pin of the AD8362 are grounded,
The 9 foot meridian capacitor C13 of the AD8362 are connected with 10 pin of the AD8362, the 10 pin ground connection of the AD8362, described
AD8362 11 pin are grounded after resistance R5, resistance R6 successively after being connected with 12 pin, and the VDBS pins of the AD8330 connect described
Resistance R5 and resistance R6 node, 13 pin of the AD8362 are divided into two-way, and the first via connects 5V power supplys, the second road warp through resistance R7
Electric capacity C14 is grounded, and 14 pin of the AD8362 are connected after being connected with 15 pin with the VMAG pins of the AD8330, the AD8362
16 pin ground connection.
Preceding to have addressed, AD8330 differential output impedance is 150 ohm, when directly driving ADC converters, due to ADC
Low pass filter is formed as capacitive load and the output resistance, and then pass band can be had a strong impact on.If other ADC is single-ended
Input mode is also required to AD8330 differential output signal being converted into single-ended signal.Therefore, it is provided with the application circuit
Differential signal is converted to Single-end output, Ran Houjin by one out drive stage, the circuit by difference scaling circuit first
Row follows improves driving force to reduce its output impedance.In order to ensure enough bandwidth, the application have selected AD8056 works
For output driver chip.AD8056 small-signal pass band is up to 400MHz, has relatively low DC error and less defeated
Go out impedance, differential signal is finally become single-ended signal and improves output driving ability by following.
Specifically, as shown in Figures 2 and 3, the differential signal to single-ended signal translation circuit is put including two AD8056
Big device chip, a differential signal input of the differential signal to single-ended signal translation circuit meet the OPHI of the AD8330
Pin, the differential signal input are divided into two-way after electric capacity C15 and resistance R8 successively, and the first via is with first AD8056's
Inversion signal input is connected, and output end of second tunnel with first AD8056 after resistance R9 is connected；The differential signal arrives
Another differential signal input of single-ended signal translation circuit connects the OPLO pins of the AD8330, the differential signal input
It is divided into two-way after electric capacity C16 and resistance R10 successively, the first via is connected with first AD8056 in-phase signal input,
Second tunnel is grounded through resistance R11；First AD8056 second AD8056 of output termination in-phase input end, second
AD8056 output end is divided into three tunnels, and the first via is connected with second AD8056 inversion signal input, and the second tunnel is through resistance
R12 is grounded, and the 3rd tunnel is output end of the differential signal to single-ended signal translation circuit.
Further, in order to ensure the stability of input end signal, in the differential signal to single-ended signal translation circuit
Input be provided with filter capacitor, specifically, as shown in Fig. 2 the differential signal is to one of single-ended signal translation circuit
Differential signal input is divided into two-way after electric capacity C17, first via ground connection, the second tunnel after electric capacity C18 with the differential signal
To another differential signal input of single-ended signal translation circuit.
To sum up, by single-ended signal to differential signal translation circuit, gain-changeable amplifier circuit, differential signal to single-ended
The mutual cooperation of signal conversion circuit and broadband demodulation and translation circuit so that the adaptive amplifying circuit has gain tune
Whole scope is big, precision is high, noise is low, with it is roomy the advantages that.
Claims (6)
- A kind of 1. adaptive amplifying circuit based on reception signal detection, it is characterised in that：Including single-ended signal to differential signal Translation circuit, gain-changeable amplifier circuit, differential signal to single-ended signal translation circuit and broadband demodulation and translation circuit, The input of the single-ended signal to differential signal translation circuit is the input of the adaptive amplifying circuit, the single-ended letter Number it is used to the single-ended signal of input is converted into differential signal exported to differential signal translation circuit；The single-ended signal arrives The differential signal outputs of differential signal translation circuit are connected with the differential signal input of the gain-changeable amplifier circuit, The gain-changeable amplifier circuit is used to realize to be amplified under wide dynamic range of gains control to signal；The variable increasing The differential signal outputs of beneficial amplifier circuit are divided into two-way, the first via and the differential signal to single-ended signal translation circuit Input is connected, and the second tunnel is connected with the input of the broadband demodulation and translation circuit, the broadband demodulation and translation circuit Output end be connected with the control terminal of the gain-changeable amplifier circuit, the differential signal to single-ended signal translation circuit Output end is the output end of the adaptive amplifying circuit, and the differential signal to single-ended signal translation circuit is used for input Differential signal is converted to single-ended signal and exported, and the broadband demodulation and translation circuit are used for gain-changeable amplifier circuit Differential output signal carry out direct detection, and according to the data of detection control gain-changeable amplifier circuit gain.
- 2. the adaptive amplifying circuit based on reception signal detection as claimed in claim 1, it is characterised in that：The single-ended letter Number include AD8131 molded breadths band driving chip to differential signal translation circuit, 1 pin of the AD8131 is grounded through resistance R1, described AD8131 2 foot meridian capacitor C1 ground connection, 3 pin of the AD8131 are divided into four tunnels, and the first via is grounded through electric capacity C2, and the second tunnel is through electricity Hold C3 ground connection, the 3rd tunnel is grounded through electric capacity C4, and the 4th tunnel is connected with+5V power supplys, and 4 pin of the AD8131 are the single-ended signal To a differential signal outputs of differential signal translation circuit, 5 pin of the AD8131 are believed for the single-ended signal to difference Another differential signal outputs of number translation circuit, 6 pin of the AD8131 are divided into four tunnels, and the first via is grounded through electric capacity C5, Second tunnel is grounded through electric capacity C6, and the 3rd tunnel is grounded through electric capacity C7, and the 4th tunnel is connected with -5V power supplys, and 7 pin of the AD8131 hang Sky, 8 pin of the AD8131 are divided into two-way, and the first via is input of the single-ended signal to differential signal translation circuit, the Two tunnels are grounded through resistance R2.
- 3. the adaptive amplifying circuit based on reception signal detection as claimed in claim 2, it is characterised in that：The variable increasing Beneficial amplifier circuit includes AD8330 type amplification chips, and the OFST of the AD8330 is grounded after drawing foot meridian capacitor C8；It is described AD8330 ENBL pins are divided into two-way, and the first via is grounded through electric capacity C9, and the second tunnel is connected through resistance R3 with 5V power supplys, described AD8330 VPOS and VPS1 pins are connected with the ENBL pins of the AD8330, and the INHI pins of the AD8330 are described One differential signal input of gain-changeable amplifier circuit, the differential signal input is through electric capacity C19 and the AD8131 The connection of 4 pin, the INLO pins of the AD8330 are another differential signal input of the gain-changeable amplifier circuit, The differential signal input is connected through electric capacity C20 with 5 pin of the AD8131, the MODE pins ground connection of the AD8330, described AD8330 VDBS pins are a control signal input of the gain-changeable amplifier circuit, the AD8330's CMGN, COMM and CMOP pin are grounded, and the VMAG pins of the AD8330 are the another of the gain-changeable amplifier circuit Individual control signal, the OPLO pins of the AD8330 export for a differential signal of the gain-changeable amplifier circuit End, the OPHI pins of the AD8330 are another differential signal outputs of the gain-changeable amplifier circuit, described AD8330 VPSO pins are divided into two-way, and the first via is grounded through electric capacity C10, and the second tunnel connects 5V power supplys through resistance R4, described AD8330 CNTR pins connect 2.5V power supplys.
- 4. the adaptive amplifying circuit based on reception signal detection as claimed in claim 3, it is characterised in that：The broadband inspection Involving translation circuit includes AD8362 type detection chips, the 1 pin ground connection of the AD8362, the 2 foot meridian capacitor C11 of the AD8362 Ground connection, 3 pin of the AD8362 connect 2.5V power supplys, and 4 pin of the AD8362 are one of the broadband demodulation and translation circuit Differential signal input, the differential signal input connect the OPHI pins of the AD8330, and 5 pin of the AD8362 are the width With another of detection and translation circuit differential signal input, the OPLO that the differential signal input meets the AD8330 draws Pin, 6 pin of the AD8362 connect 2.5V power supplys, and 7 pin of the AD8362 are divided into two-way, and the first via connects 2.5V electricity through electric capacity C12 Source, the second tunnel ground connection, the 8 pin ground connection of the AD8362, the 9 foot meridian capacitor C13 and the AD8362 of the AD8362 10 pin Connection, the 10 pin ground connection of the AD8362,11 pin of the AD8362 are followed by through resistance R5, resistance R6 successively after being connected with 12 pin Ground, the VDBS pins of the AD8330 connect the resistance R5 and resistance R6 node, and 13 pin of the AD8362 are divided into two-way, the Connect 5V power supplys through resistance R7 all the way, the second tunnel is grounded through electric capacity C14,14 pin of the AD8362 be connected with 15 pin after with it is described AD8330 VMAG pins connection, the 16 pin ground connection of the AD8362.
- 5. the adaptive amplifying circuit based on reception signal detection as claimed in claim 3, it is characterised in that：The difference letter Number include two AD8056 amplifier chips, the differential signal to single-ended signal translation circuit to single-ended signal translation circuit One differential signal input connects the OPHI pins of the AD8330, and the differential signal input is successively through electric capacity C15 and electricity It is divided into two-way after resistance R8, the first via is connected with first AD8056 inversion signal input, and the second tunnel is after resistance R9 with the One AD8056 output end connection；Another differential signal input of the differential signal to single-ended signal translation circuit connects The OPLO pins of the AD8330, the differential signal input are divided into two-way after electric capacity C16 and resistance R10 successively, and first Road is connected with first AD8056 in-phase signal input, and the second tunnel is grounded through resistance R11；First AD8056 output end Second AD8056 in-phase input end is connect, second AD8056 output end is divided into three tunnels, the first via and second AD8056 The connection of inversion signal input, the second tunnel is grounded through resistance R12, and the 3rd tunnel is that the differential signal is electric to single-ended signal conversion The output end on road.
- 6. the adaptive amplifying circuit based on reception signal detection as claimed in claim 5, it is characterised in that：The difference letter Number it is divided into two-way after electric capacity C17 to a differential signal input of single-ended signal translation circuit, first via ground connection, the second tunnel After electric capacity C18 with another differential signal input of the differential signal to single-ended signal translation circuit.
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| CN201721329740.5U CN207218648U (en) | 2017-10-16 | 2017-10-16 | Adaptive amplifying circuit based on reception signal detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677134A (en) * | 2019-10-22 | 2020-01-10 | 成都共源科技有限公司 | Self-adaptive bandwidth adjusting circuit |
| CN113285690A (en) * | 2021-07-21 | 2021-08-20 | 南京燧锐科技有限公司 | 180 degrees phase shifter circuit of bandwidth |
-
2017
- 2017-10-16 CN CN201721329740.5U patent/CN207218648U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677134A (en) * | 2019-10-22 | 2020-01-10 | 成都共源科技有限公司 | Self-adaptive bandwidth adjusting circuit |
| CN113285690A (en) * | 2021-07-21 | 2021-08-20 | 南京燧锐科技有限公司 | 180 degrees phase shifter circuit of bandwidth |
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Effective date of registration: 20231102 Address after: No. 2601, 2nd Floor, West Gate, Building 3, No. 368 Xinshi North Road, Shijiazhuang City, Hebei Province, 050000 Patentee after: Dechen Technology (Shijiazhuang) Co.,Ltd. Address before: 050000 room 406, area B, software building, Jinshi Park, 368 Xinshi North Road, Shijiazhuang City, Hebei Province Patentee before: SHIJIAZHUANG TIANJIAN COMMUNICATION TECHNOLOGY Co.,Ltd. |