CN205961073U - A double frequency -band band pass filter for laser rangefinder - Google Patents
A double frequency -band band pass filter for laser rangefinder Download PDFInfo
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- CN205961073U CN205961073U CN201621012303.6U CN201621012303U CN205961073U CN 205961073 U CN205961073 U CN 205961073U CN 201621012303 U CN201621012303 U CN 201621012303U CN 205961073 U CN205961073 U CN 205961073U
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Abstract
The utility model provides a double frequency -band band pass filter for laser rangefinder, the utility model belongs to the signal processing field, concretely relates to a double frequency -band band pass filter for laser rangefinder. The problem of signal attenuation in the current band pass filter passband big is solved. The utility model discloses a signal output part of input impedance matching unit is continuous with high -frequency part front -end amplifying circuit 's signal input part, and another signal output part of input impedance matching unit links to each other with low frequency portion front -end amplifying circuit 's signal input part, high -frequency part front -end amplifying circuit 's signal is inputed to the adder unit through high -frequency part two -stage band pass filter, low frequency portion front -end amplifying circuit 's signal is inputed to the adder unit through two -stage band pass filter, the signal output part of adder unit connects the signal input part that output impedance matches the unit, and the signal output part of output impedance matching unit is band pass filter's signal output part. The utility model is suitable for an use as the wave filter.
Description
Technical field
This utility model belongs to field of signal processing and in particular to a kind of double frequency-band bandpass filtering for laser ranging
Device.
Background technology
It is a kind of brand-new laser ranging technique based on the laser ranging of FSK, this technology needs to extract from input signal
Go out mid frequency and be respectively f1=2.5MHz, the sine wave of f2=102MHz measures.Traditional band filter, typically
It is made up of passive component resistor-inductor-capacitor, the signal attenuation in passband is than larger.
Content of the invention
This utility model be in order to solve the problems, such as the signal attenuation in existing band filter passband big it is proposed that a kind of
Double band bandpass filter for laser ranging.
A kind of double band bandpass filter for laser ranging described in the utility model, it includes input impedance matching
Unit 1, HFS frontend amplifying circuit 2, HFS first order band filter 3, radio-frequency head second level band filter
4th, low frequency part frontend amplifying circuit 5, low frequency part first order band filter 6, low frequency part second level band filter 7,
Adder unit 8 and output impedance matching unit 9；
The signal input part of input impedance matching unit 1 is as the signal input part of band filter, input impedance matching
One signal output part of unit 1 is connected with the signal input part of HFS frontend amplifying circuit 2, input impedance matching unit
1 another signal output part is connected with the signal input part of low frequency part frontend amplifying circuit 5；
The signal output part of HFS frontend amplifying circuit 2 is through HFS first order band filter 3 and radio-frequency head
Signal output part after second level band filter 4 is connected with a signal input part of adder unit 8；
The signal output part of low frequency part frontend amplifying circuit 5 is through low frequency part first order band filter 6 and low frequency portion
The signal output part after second level band filter 7 is divided to be connected with another signal input part of adder unit 8；
The signal output part of adder unit 8 connects the signal input part of output impedance matching unit 9, and output impedance is mated
The signal output part of unit 9 is the signal output part of band filter；
HFS first order band filter 3 and radio-frequency head second level band filter 4 are passive, active combination
Bandwidth-limited circuit；
Low frequency part first order band filter 6 is passive ellipse filter circuit, low frequency part second level band filter 7
For active bandpass filiter circuit.
This utility model be double band bandpass filter, laser ranging technique provide mid frequency be respectively 2.5MHz and
The sine wave of 102MHz.Traditional band filter, is typically made up of passive component resistor-inductor-capacitor, the letter in passband
Number attenuation ratio is larger.Double band bandpass filter involved by this utility model, in the form of passive and active combining, its
Signal in passband is not only decayed, but also can amplify.This wave filter is responsible for producing different pass band by two-way
Band-pass filter unit composition, wherein one tunnel is band filter high frequency unit, mid frequency be 102MHz；Another road is band
Bandpass filter low frequency cell, mid frequency is 2.5MHz；Two-way band-pass filter unit is in parallel, in the form of adder,
Realize the output of double band bandpass filter.
Brief description
Fig. 1 is structural representation described in the utility model；
Fig. 2 is the electrical block diagram of input impedance matching unit；
Fig. 3 is the electrical block diagram of HFS first order band filter；
Fig. 4 is the electrical block diagram of low frequency part first order band filter；
Fig. 5 is the electrical block diagram of low frequency part second level band filter；
Fig. 6 is the electrical block diagram of adder unit；
Fig. 7 is the electrical block diagram of output impedance matching unit；
Fig. 8 is double band bandpass filter amplitude-frequency response signal graph described in the utility model.
Specific embodiment
Specific embodiment one, combine Fig. 1 illustrate present embodiment, the one kind described in present embodiment be used for laser ranging
Double band bandpass filter, it includes input impedance matching unit 1, HFS frontend amplifying circuit 2, HFS first
Level band filter 3, radio-frequency head second level band filter 4, low frequency part frontend amplifying circuit 5, low frequency part first order band
Bandpass filter 6, low frequency part second level band filter 7, adder unit 8 and output impedance matching unit 9；
The signal input part of input impedance matching unit 1 is as the signal input part of band filter, input impedance matching
One signal output part of unit 1 is connected with the signal input part of HFS frontend amplifying circuit 2, input impedance matching unit
1 another signal output part is connected with the signal input part of low frequency part frontend amplifying circuit 5；
The signal output part of HFS frontend amplifying circuit 2 is through HFS first order band filter 3 and radio-frequency head
Signal output part after second level band filter 4 is connected with a signal input part of adder unit 8；
The signal output part of low frequency part frontend amplifying circuit 5 is through low frequency part first order band filter 6 and low frequency portion
The signal output part after second level band filter 7 is divided to be connected with another signal input part of adder unit 8；
The signal output part of adder unit 8 connects the signal input part of output impedance matching unit 9, and output impedance is mated
The signal output part of unit 9 is the signal output part of band filter；
HFS first order band filter 3 and radio-frequency head second level band filter 4 are passive, active combination
Bandwidth-limited circuit；
Low frequency part first order band filter 6 is passive ellipse filter circuit, low frequency part second level band filter 7
For active bandpass filiter circuit.
Fig. 1 gives the overall plan of double band bandpass filter.As illustrated, wave filter is made up of following 5 parts：
Input impedance matching unit, band filter HFS (102MHz), band filter low frequency part (2.5MHz), adder
Unit, output impedance matching unit.Wherein, the effect of input impedance matching unit is：With filter input end signal generator
Impedance mated；Band filter HFS is responsible for producing the passband that a mid frequency is 102MHz；Band logical is filtered
Ripple device low frequency part is responsible for producing the passband that a mid frequency is 2.5MHz；The effect of adder unit is：By above-mentioned two
The individual band filter with different pass band is overlapped, and realizes double band bandpass filter；Output impedance coupling is single
Unit effect be：Mated with the load that filter output is carried.
Specific embodiment two, combine Fig. 2 illustrate present embodiment, present embodiment is to described in specific embodiment one
The further illustrating of a kind of double band bandpass filter for laser ranging, input impedance matching unit 1 includes inputting SMA
Interface J0, electric capacity C1, operational amplifier U1, No. two operational amplifier U2, resistance R1, resistance R2, resistance R3, resistance R4,
Resistance R5 and resistance R6；
The signal output pin of input SMA interface J0 connects one end of electric capacity C1, the other end of electric capacity C1 simultaneously with resistance
The positive power end of one end of R1, the positive power end of an operational amplifier U1 and No. two operational amplifier U2 connects；Resistance
The other end ground connection of R1；Other pins of input SMA interface J0 are all grounded；
The negative sense power end of a number operational amplifier U1 is connected with one end of resistance R2 and one end of resistance R3 simultaneously；Resistance
The other end ground connection of R3；The signal output part of a number operational amplifier U1 is a signal output of input impedance matching unit 1
End, the signal output part of an operational amplifier U1 connects the other end of resistance R2；
The two-phase positive source of a number operational amplifier U1 connects+5V power supply；The two-phase power supply of a number operational amplifier U1
Negative pole connects -5V power supply；
The negative sense power end of No. two operational amplifier U2 is connected with one end of resistance R4 and one end of resistance R5 simultaneously；Resistance
The other end ground connection of R5；The signal output part of No. two operational amplifier U2 is simultaneously connected with the other end of resistance R4 and the one of resistance R6
End, the other end of resistance R6 is another signal output part of input impedance matching unit 1；
The two-phase positive source of No. two operational amplifier U2 connects+5V power supply；The two-phase power supply of No. two operational amplifier U2
Negative pole connects -5V power supply.
Specific embodiment three, combine Fig. 3 illustrate present embodiment, present embodiment is to specific embodiment one or two
The further illustrating of described a kind of double band bandpass filter for laser ranging, HFS first order band filter
3 is identical with the structure of radio-frequency head second level band filter 4, and HFS first order band filter 3 includes electric capacity C2, inductance
L1, inductance L2, electric capacity C3, No. three operational amplifier U3, resistance R7 and resistance R8；
One end of electric capacity C2 be HFS first order band filter 3 signal input part, the other end of electric capacity C2 with
One end of inductance L1 connects, the other end of inductance L1 simultaneously with one end of inductance L2, one end of electric capacity C3 and No. three operation amplifiers
The positive power end of device U3 connects；The negative sense power end of No. three operational amplifier U3 simultaneously with one end of resistance R7 and resistance R8
One end is connected；The signal output part of No. three operational amplifier U3 is the signal output part of first order band filter (3), No. three fortune
The signal output part calculating amplifier U3 connects the other end of resistance R7, the other end ground connection of resistance R8；
The two-phase positive source of No. three operational amplifier U3 connects+5V power supply；The two-phase power supply of No. three operational amplifier U3
Negative pole connects -5V power supply.
Band filter HFS, using passive and active combine, the circuit form of two-stage series connection, as shown in Figure 2.
The amplifying circuit (being made up of amplifier AD8055) by front end for the input signal, frequency is higher than the target signal filter of 200MHz, simultaneously
Amplify 2 times；Again through the two-stage bandpass filtering of back, wherein passive part is decayed to signal；Active part carries out signal
Compensate, the signal that passive part is exported amplifies 5 times.Two-stage series connection circuit structure is identical, by passive Gaussian filter circuit and having
The bandwidth-limited circuit of source broadband operational amplifier AD8009 combination is constituted.
In HFS first order band filter, it is made up of inductance L1, L2, electric capacity C2, C3, because signal passes through this
Passive Gaussian filter circuit, larger to the attenuation degree ratio of signal, so (being transported by broadband using amplifying circuit in this utility model
Put AD8009 composition) signal decayed is compensated, signal is amplified 5 times.In the same manner, signal is through radio-frequency head second level band
Passive Gaussian filter circuit in bandpass filter, can produce again and largely decay, broadband operational amplifier AD8009 thereafter
Equally the signal of decay can be compensated, signal be amplified again 5 times.
Four inductance in passive Gaussian filter circuit, all using the high-frequency inductor of high q-factor, good stability, energy loss
Little.The frequency-selective network being made up of this high-frequency inductor, intermediate zone scope is narrow.And, based on gaussian filtering principle and broadband fortune
Put the bandwidth-limited circuit of AD8009 composition, using HFS first order band filter and radio-frequency head second level bandpass filtering
The form of device two-stage series connection, after being mutually matched, can filter remaining component of signal in previous stage, have good filtering effect
Really.
Specific embodiment four, combine Fig. 4 illustrate present embodiment, present embodiment is to specific embodiment one or two
The further illustrating of described a kind of double band bandpass filter for laser ranging, low frequency part first order band filter
6 include electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, inductance L3, inductance L4, inductance L5,
Inductance L6, inductance L7, inductance L8 and inductance L9；
One end of electric capacity C4 is the signal input part of low frequency part first order band filter 6, and the other end of electric capacity C4 is even
Connect one end of inductance L3, the other end of inductance L3 is simultaneously connected with one end of one end of inductance L4, one end of inductance L5 and electric capacity C7；
The other end of inductance L4 connects one end of electric capacity C5, the other end ground connection of electric capacity C5；The other end of inductance L5 connects
One end of electric capacity C6, the other end ground connection of electric capacity C6；
The other end of electric capacity C7 connects one end of inductance L6, and the other end of inductance L6 is simultaneously connected with one end of inductance L7, electricity
Sense one end of L8 and one end of electric capacity C10, the other end of electric capacity C10 connects one end of inductance L9, and the other end of inductance L9 is low
The signal output part of frequency part first order band filter 6；
The other end of inductance L7 connects one end of electric capacity C8, the other end ground connection of electric capacity C8；The other end of inductance L8 connects
One end of electric capacity C9, the other end ground connection of electric capacity C9.
Band filter low frequency part, in the form of the passive elliptic filter of 7 ranks is combined with amplifier AD8055, such as schemes
Shown in 3.Input signal, by frontend amplifying circuit (being made up of amplifier AD8055), is higher than the frequency-portions quilt of 40MHz in signal
Filter, the signal passing through is amplified 5 times simultaneously；Followed by pass through by inductance L3, L4, L5, L6, L7, L8, L9 and electric capacity C4,
The 7 ranks passive ellipse filter circuit that C5, C6, C7, C8, C9, C10 are constituted.
Specific embodiment five, combine Fig. 5 illustrate present embodiment, present embodiment is to described in specific embodiment one
The further illustrating of a kind of double band bandpass filter for laser ranging, low frequency part second level band filter 7 wraps
Include electric capacity C10, inductance L9, resistance R9, No. four operational amplifier U4, resistance R10, resistance R11 and electric capacity C11；
One end of electric capacity C10 is the signal input part of low frequency part second level band filter 7, the other end of electric capacity C10
Connect one end of inductance L9.The other end of inductance L9 is simultaneously connected with one end of resistance R9 and the positive electricity of No. four operational amplifier U4
Source；The negative sense power end of No. four operational amplifier U4 is simultaneously connected with one end of resistance R10 and one end of resistance R11, No. four fortune
The signal output part calculating amplifier U4 is simultaneously connected with the other end of resistance R10 and one end of electric capacity C11, the other end of electric capacity C11
Signal output part for low frequency part second level band filter 7；The other end ground connection of resistance R11；
The two-phase positive source of No. four operational amplifier U4 connects+5V power supply；The two-phase power supply of No. four operational amplifier U4
Negative pole connects -5V power supply.
After low frequency part first order band filter 6, output has narrower transition band width and less stop band ripple
Signal, so very big to the attenuation degree of signal, then through low frequency part second level band filter amplifier (by amplifier
AD8055 forms), as described in Figure 5, the signal of decay is compensated, signal is amplified 5 times.
Specific embodiment six, combine Fig. 6 illustrate present embodiment, present embodiment is to described in specific embodiment five
The further illustrating of a kind of double band bandpass filter for laser ranging, adder unit 8 includes resistance R12, resistance
R13, resistance R14, No. five operational amplifier U5 and electric capacity C12；
One end of resistance R12 is a signal input part of adder unit 8, and one end of resistance R14 is adder unit 8
Another signal input part, the other end of resistance R12 just with the other end of resistance R14, No. five operational amplifier U5 simultaneously
Connect to one end of power supply signal end and resistance R13, the negative sense power end ground connection of No. five operational amplifier U5, No. five operation amplifiers
The signal output part of device U5 is simultaneously connected with one end of the resistance R13 other end and electric capacity C12, and the other end of electric capacity C12 is adder
The signal output part of unit 8；
The two-phase positive source of No. five operational amplifier U5 connects+5V power supply；The two-phase power supply of No. five operational amplifier U5
Negative pole connects -5V power supply.
This utility model adopts adder circuit, and the frequency response of corresponding with low frequency cell for high frequency two wave filter is folded
Add up, finally achieve the band filter with two passbands, as shown in Figure 6.When the electricity changing two input circuits
During resistance R8, R14, the proportionate relationship between output voltage and this road input voltage also can change therewith, and then can control two
The signal amplitude size of input circuit, and do not affect each other, therefore adjust comparison flexible.
Specific embodiment seven, combine Fig. 7 illustrate present embodiment, present embodiment is to described in specific embodiment five
The further illustrating of a kind of double band bandpass filter for laser ranging, output impedance matching unit 9 includes resistance
R15, resistance R16, resistance R17, resistance R18, electric capacity C13, No. six operational amplifier U6 and output SMA interface J1；
One end of resistance R15 connects the positive power end of No. six operational amplifier U6, described No. six operational amplifier U6's
Positive power end is the signal input part of output impedance matching unit 9；
The negative sense power end of No. six operational amplifier U6 is simultaneously connected with one end of resistance R16 and one end of resistance R17, resistance
The other end ground connection of R17；
The signal output part of No. six operational amplifier U6 is simultaneously connected with the other end of resistance R16 and one end of resistance R18；Electricity
The other end of resistance R18 connects one end of electric capacity C13, and the signal input of the other end connection output SMA interface J1 of electric capacity C13 is drawn
Foot, other pins of output SMA interface J1 are all grounded；
The two-phase positive source of No. six operational amplifier U6 connects+5V power supply；The two-phase power supply of No. six operational amplifier U6
Negative pole connects -5V power supply.
In this element, output impedance R3=49.9 Ω, double band bandpass filter amplitude-frequency response signal graph, as Fig. 8 institute
Show.This load connect with filter output is relevant.In addition, because the signal of final output exists to a certain degree in filtering
Decay, and the pass band of the signal of final output is relatively wide, therefore to meet final signal using broadband operational amplifier AD8009
Output, 5 times will be amplified by signal after adder.
Beneficial effect
(1) in the case that performance is constant, the band filter small volume involved by this utility model, good stability, mistake
Cross band narrow；
(2) using passive and active combine, form that HFS is in parallel with low frequency part, signal not only do not decline
Subtract, and its gain in passband can be made to reach 10dB；
(3) band filter high frequency 102MHz amplitude-frequency characteristic, a cut-off frequency f left side=99MHz, the f right side=106MHz, passband band
Wide B=7MHz；Low frequency 2.5MHz amplitude-frequency characteristic, a cut-off frequency f left side=2.25MHz, the f right side=2.75MHz, pass band width B=
0.5MHz, as shown in Figure 7.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of double band bandpass filter for laser ranging is it is characterised in that it includes input impedance matching unit
(1), HFS frontend amplifying circuit (2), HFS first order band filter (3), radio-frequency head second level bandpass filtering
Device (4), low frequency part frontend amplifying circuit (5), low frequency part first order band filter (6), low frequency part second level band logical
Wave filter (7), adder unit (8) and output impedance matching unit (9)；
The signal input part of input impedance matching unit (1) is as the signal input part of band filter, input impedance matching list
One signal output part of first (1) is connected with the signal input part of HFS frontend amplifying circuit (2), input impedance matching list
Another signal output part of first (1) is connected with the signal input part of low frequency part frontend amplifying circuit (5)；
The signal output part of HFS frontend amplifying circuit (2) is through HFS first order band filter (3) and radio-frequency head
Signal output part after second level band filter (4) is connected with a signal input part of adder unit (8)；
The signal output part of low frequency part frontend amplifying circuit (5) is through low frequency part first order band filter (6) and low frequency portion
The signal output part after second level band filter (7) is divided to be connected with another signal input part of adder unit (8)；
The signal output part of adder unit (8) connects the signal input part of output impedance matching unit (9), and output impedance is mated
The signal output part of unit (9) is the signal output part of band filter；
HFS first order band filter (3) and radio-frequency head second level band filter (4) are passive, active combination
Bandwidth-limited circuit；
Low frequency part first order band filter (6) is passive ellipse filter circuit, low frequency part second level band filter (7)
For active bandpass filiter circuit.
2. a kind of double band bandpass filter for laser ranging according to claim 1 is it is characterised in that input hinders
Anti- matching unit (1) includes input SMA interface (J0), electric capacity C1, operational amplifier (U1), No. two operational amplifiers
(U2), resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6；
The signal output pin of input SMA interface (J0) connects one end of electric capacity C1, the other end of electric capacity C1 simultaneously with resistance R1
One end, the positive power end of the positive power end of an operational amplifier (U1) and No. two operational amplifiers (U2) connects；Electricity
The other end ground connection of resistance R1；Other pins of input SMA interface (J0) are all grounded；
The negative sense power end of a number operational amplifier (U1) is connected with one end of resistance R2 and one end of resistance R3 simultaneously；Resistance R3
The other end ground connection；The signal output part of a number operational amplifier (U1) is that a signal of input impedance matching unit (1) is defeated
Go out end, the signal output part of an operational amplifier (U1) connects the other end of resistance R2；
The two-phase positive source of a number operational amplifier (U1) connects+5V power supply；The two-phase power supply of a number operational amplifier (U1)
Negative pole connects -5V power supply；
The negative sense power end of No. two operational amplifiers (U2) is connected with one end of resistance R4 and one end of resistance R5 simultaneously；Resistance R5
The other end ground connection；The signal output part of No. two operational amplifiers (U2) is simultaneously connected with the other end of resistance R4 and the one of resistance R6
End, the other end of resistance R6 is another signal output part of input impedance matching unit (1)；
The two-phase positive source of No. two operational amplifiers (U2) connects+5V power supply；The two-phase power supply of No. two operational amplifiers (U2)
Negative pole connects -5V power supply.
3. a kind of double band bandpass filter for laser ranging according to claim 1 and 2 is it is characterised in that height
Frequency part first order band filter (3) is identical with the structure of radio-frequency head second level band filter (4), the HFS first order
Band filter (3) includes electric capacity C2, inductance L1, inductance L2, electric capacity C3, No. three operational amplifiers (U3), resistance R7 and resistance
R8；
One end of electric capacity C2 is the signal input part of HFS first order band filter (3), the other end of electric capacity C2 and electricity
One end of sense L1 connects, the other end of inductance L1 simultaneously with one end of inductance L2, one end of electric capacity C3 and No. three operational amplifiers
(U3) positive power end connects；The negative sense power end of No. three operational amplifiers (U3) one end and the resistance R8 with resistance R7 simultaneously
One end be connected；The signal output part of No. three operational amplifiers (U3) is the signal output part of first order band filter (3), three
The signal output part of number operational amplifier (U3) connects the other end of resistance R7, the other end ground connection of resistance R8；
The two-phase positive source of No. three operational amplifiers (U3) connects+5V power supply；The two-phase power supply of No. three operational amplifiers (U3)
Negative pole connects -5V power supply.
4. a kind of double band bandpass filter for laser ranging according to claim 1 and 2 is it is characterised in that low
Frequency part first order band filter (6) includes electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity
C10, inductance L3, inductance L4, inductance L5, inductance L6, inductance L7, inductance L8 and inductance L9；
One end of electric capacity C4 is the signal input part of low frequency part first order band filter (6), and the other end of electric capacity C4 connects
One end of inductance L3, the other end of inductance L3 is simultaneously connected with one end of one end of inductance L4, one end of inductance L5 and electric capacity C7；
The other end of inductance L4 connects one end of electric capacity C5, the other end ground connection of electric capacity C5；The other end of inductance L5 connects electric capacity
One end of C6, the other end ground connection of electric capacity C6；
The other end of electric capacity C7 connects one end of inductance L6, and the other end of inductance L6 is simultaneously connected with one end of inductance L7, inductance L8
One end and electric capacity C10 one end, the other end of electric capacity C10 connects one end of inductance L9, and the other end of inductance L9 is low frequency portion
Divide the signal output part of first order band filter (6)；
The other end of inductance L7 connects one end of electric capacity C8, the other end ground connection of electric capacity C8；The other end of inductance L8 connects electric capacity
One end of C9, the other end ground connection of electric capacity C9.
5. a kind of double band bandpass filter for laser ranging according to claim 1 is it is characterised in that low frequency portion
Second level band filter (7) is divided to include electric capacity C10, inductance L9, resistance R9, No. four operational amplifiers (U4), resistance R10, electricity
Resistance R11 and electric capacity C11；
One end of electric capacity C10 is the signal input part of low frequency part second level band filter (7), and the other end of electric capacity C10 is even
Connect one end of inductance L9, the other end of inductance L9 is simultaneously connected with one end of resistance R9 and the positive electricity of No. four operational amplifiers (U4)
Source；The negative sense power end of No. four operational amplifiers (U4) is simultaneously connected with one end of resistance R10 and one end of resistance R11, No. four
The signal output part of operational amplifier (U4) is simultaneously connected with the other end of resistance R10 and one end of electric capacity C11, and electric capacity C11's is another
One end is the signal output part of low frequency part second level band filter (7)；The other end ground connection of resistance R11；
The two-phase positive source of No. four operational amplifiers (U4) connects+5V power supply；The two-phase power supply of No. four operational amplifiers (U4)
Negative pole connects -5V power supply.
6. a kind of double band bandpass filter for laser ranging according to claim 5 is it is characterised in that adder
Unit (8) includes resistance R12, resistance R13, resistance R14, No. five operational amplifiers (U5) and electric capacity C12；
One end of resistance R12 is a signal input part of adder unit (8), and one end of resistance R14 is adder unit (8)
Another signal input part, the other end of resistance R12 simultaneously with the other end of resistance R14, No. five operational amplifiers (U5)
One end of positive power supply signal end and resistance R13 connects, the negative sense power end ground connection of No. five operational amplifiers (U5), No. five computings
The signal output part of amplifier (U5) is simultaneously connected with one end of the resistance R13 other end and electric capacity C12, and the other end of electric capacity C12 is
The signal output part of adder unit (8)；
The two-phase positive source of No. five operational amplifiers (U5) connects+5V power supply；The two-phase power supply of No. five operational amplifiers (U5)
Negative pole connects -5V power supply.
7. a kind of double band bandpass filter for laser ranging according to claim 5 is it is characterised in that output hinders
Anti- matching unit (9) include resistance R15, resistance R16, resistance R17, resistance R18, electric capacity C13, No. six operational amplifiers (U6) and
Output SMA interface (J1)；
One end of resistance R15 connects the positive power end of No. six operational amplifiers (U6), described No. six operational amplifiers (U6)
Positive power end is the signal input part of output impedance matching unit (9)；
The negative sense power end of No. six operational amplifiers (U6) is simultaneously connected with one end of resistance R16 and one end of resistance R17, resistance
The other end ground connection of R17；
The signal output part of No. six operational amplifiers (U6) is simultaneously connected with the other end of resistance R16 and one end of resistance R18；Resistance
The other end of R18 connects one end of electric capacity C13, and the signal input of other end connection output SMA interface (J1) of electric capacity C13 is drawn
Foot, other pins of output SMA interface (J1) are all grounded；
The two-phase positive source of No. six operational amplifiers (U6) connects+5V power supply；The two-phase power supply of No. six operational amplifiers (U6)
Negative pole connects -5V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621012303.6U CN205961073U (en) | 2016-08-30 | 2016-08-30 | A double frequency -band band pass filter for laser rangefinder |
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| CN201621012303.6U CN205961073U (en) | 2016-08-30 | 2016-08-30 | A double frequency -band band pass filter for laser rangefinder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787606A (en) * | 2020-12-30 | 2021-05-11 | 西安建筑科技大学 | Signal reading circuit |
| CN113612375A (en) * | 2021-05-07 | 2021-11-05 | 宁波市芯能微电子科技有限公司 | High-frequency filter circuit |
| CN113810021A (en) * | 2021-08-13 | 2021-12-17 | 天津大学 | Novel reconfigurable filter |
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2016
- 2016-08-30 CN CN201621012303.6U patent/CN205961073U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787606A (en) * | 2020-12-30 | 2021-05-11 | 西安建筑科技大学 | Signal reading circuit |
| CN113612375A (en) * | 2021-05-07 | 2021-11-05 | 宁波市芯能微电子科技有限公司 | High-frequency filter circuit |
| CN113612375B (en) * | 2021-05-07 | 2023-06-23 | 宁波市芯能微电子科技有限公司 | High-frequency filter circuit |
| CN113810021A (en) * | 2021-08-13 | 2021-12-17 | 天津大学 | Novel reconfigurable filter |
| CN113810021B (en) * | 2021-08-13 | 2024-04-05 | 天津大学 | Novel reconfigurable filter |
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