CN104702218B - One kind miniaturization double balanced mixer - Google Patents
One kind miniaturization double balanced mixer Download PDFInfo
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- CN104702218B CN104702218B CN201410723386.9A CN201410723386A CN104702218B CN 104702218 B CN104702218 B CN 104702218B CN 201410723386 A CN201410723386 A CN 201410723386A CN 104702218 B CN104702218 B CN 104702218B
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Abstract
Double balanced mixer is miniaturized the invention discloses one kind, including：First 3dB electric bridges, the 2nd 3dB electric bridges, the 3rd 3dB electric bridges, the 4th 3dB electric bridges, the first impedance matching circuit, the second impedance matching circuit, the 3rd impedance matching circuit, the 4th impedance matching circuit, the first mixer diode, the second mixer diode, the 3rd mixer diode, the 4th mixer diode, the first filter circuit, the second filter circuit；Common node between first filter circuit and the second filter circuit is transmission signal port.The miniaturization double balanced mixer local oscillation power is high, local oscillator isolation is good, dynamic range is big, conversion loss is small, have inhibitory action to RF even product, and volume size is small, it is adaptable to the microwave radio circuit of miniaturization.
Description
Technical field
The present invention relates to frequency mixer technical field in the communications field, in particular it relates to a kind of miniaturization double balanced mixer.
Background technology
Frequency mixer is indispensable part in radio frequency microwave circuit system.Whether microwave communication, radar, remote control, distant
Sense or scouting and electronic countermeasure, and microwave measurement system, it is necessary to which microwave signal is dropped to middle low frequency with frequency mixer to enter
Row processing.In practice, most of AM (Amplitude Modulation, amplitude modulation), SSB (Single Side Band,
Single-side belt) and digital transmitter be required for frequency mixer signal frequency converting to a higher frequency, be then transmitted into aerial；
And superhet is then needed using frequency mixer the signal frequency converting received to relatively low frequency --- intermediate frequency.Receive
Machine must use the signal of this lower frequency, because the signal of this frequency is easily carried out effectively amplifying and filtering with intermediater-frequency stage
Ripple, easily optimizes frequency range, so as to improve gain and the selectivity of receiver.
Existing double balanced mixer is generally diode double balanced mixer or CMOS double balanced mixers, diode double flat weighing apparatus
The schematic diagram of frequency mixer is shown in Figure 1, and it is typically made using thick-film technique, and passive element accounts for area greatly, and volume is big, uncomfortable
In microwave radio circuit for the miniaturization of moving communicating field.
The content of the invention
The present invention is in order to overcome the larger defect of double balanced mixer volume in the prior art, according to one of the present invention
Aspect, proposes a kind of miniaturization double balanced mixer.
A kind of miniaturization double balanced mixer provided in an embodiment of the present invention, including：First 3dB electric bridges, the 2nd 3dB electricity
Bridge, the 3rd 3dB electric bridges, the 4th 3dB electric bridges, the first impedance matching circuit, the second impedance matching circuit, the 3rd impedance matching electricity
Road, the 4th impedance matching circuit, the first mixer diode, the second mixer diode, the 3rd mixer diode, the 4th two poles of mixing
Pipe, the first filter circuit, the second filter circuit；The straight-through end of first 3dB electric bridges is connected with the input of the 3rd 3dB electric bridges, the
The coupled end of one 3dB electric bridges is connected with the isolation end of the 4th 3dB electric bridges；The straight-through end of 2nd 3dB electric bridges and the 3rd 3dB electric bridges
Isolation end is connected, and the coupled end of the 2nd 3dB electric bridges is connected with the input of the 4th 3dB electric bridges；The isolation end of first 3dB electric bridges with
The isolation end of 2nd 3dB electric bridges is grounded；The straight-through end of 3rd 3dB electric bridges after the first impedance matching circuit with first by being mixed
First pin of diode is connected, and the second pin of the first mixer diode is connected with the first filter circuit；4th 3dB electric bridges
Coupled end by being connected after the second impedance matching circuit with the negative electrode of the second mixer diode, the anode of the second mixer diode with
Second filter circuit is connected；The coupled end of 3rd 3dB electric bridges by after the 3rd impedance matching circuit with the 3rd mixer diode
Anode is connected, and the negative electrode of the 3rd mixer diode is connected with the first filter circuit；The straight-through end of 4th 3dB electric bridges passes through the 4th resistance
The first pin after anti-match circuit with the 4th mixer diode is connected, the second pin of the 4th mixer diode and the second filtering
Circuit is connected；First filter circuit is also connected with the second filter circuit, the public affairs between the first filter circuit and the second filter circuit
Conode is transmission signal port.
In the above-mentioned technical solutions, the first pin of the first mixer diode is that anode, second pin are negative electrode, and the 4th
First pin of mixer diode is that negative electrode, second pin are anode；Or
First pin of the first mixer diode is that negative electrode, second pin are anode, and the first of the 4th mixer diode
Pin is that anode, second pin are negative electrode.
In the above-mentioned technical solutions, the first impedance matching circuit includes the first electric capacity and the first inductance, first electric capacity one end
It is connected with the straight-through end of the 3rd 3dB electric bridges, the other end is connected with the first pin of the first mixer diode；One end of first inductance
It is connected with the first pin of the first mixer diode, other end ground connection；Second impedance matching circuit includes the second electric capacity and second
Inductance, second electric capacity one end is connected with the coupled end of the 4th 3dB electric bridges, and the other end is connected with the negative electrode of the second mixer diode；
One end of second inductance is connected with the negative electrode of the second mixer diode, other end ground connection；3rd impedance matching circuit includes the 3rd
Electric capacity and the 3rd inductance, the 3rd electric capacity one end are connected with the coupled end of the 3rd 3dB electric bridges, the other end and the 3rd mixer diode
Anode is connected；One end of 3rd inductance is connected with the anode of the 3rd mixer diode, other end ground connection；4th impedance matching circuit
Including the 4th electric capacity and the 4th inductance, the 4th electric capacity one end is connected with the straight-through end of the 4th 3dB electric bridges, the other end and the 4th mixing
First pin of diode is connected；One end of 4th inductance is connected with the first pin of the 4th mixer diode, other end ground connection.
In the above-mentioned technical solutions, the first filter circuit includes the 5th electric capacity, the 5th inductance, the 7th electric capacity and the 7th electricity
Sense；One end ground connection of 5th electric capacity, the other end is connected after passing sequentially through the 5th inductance, the 7th inductance with one end of the 7th electric capacity,
The other end ground connection of 7th electric capacity；5th electric capacity and the common node of the 5th inductance and the second pin phase of the first mixer diode
Even, the 7th electric capacity is connected with the common node of the 7th inductance with the negative electrode of the 3rd mixer diode；Second filter circuit includes the
Six electric capacity, the 6th inductance, the 8th electric capacity and the 8th inductance；6th electric capacity one end ground connection, the other end pass sequentially through the 6th inductance,
It is connected after 8th inductance with one end of the 8th electric capacity, the other end ground connection of the 8th electric capacity；6th electric capacity is public with the 6th inductance
Node is connected with the anode of the second mixer diode, the common node and the 4th mixer diode of the 8th electric capacity and the 8th inductance
Second pin is connected；The public section between common node and the 6th inductance and the 8th inductance between 5th inductance and the 7th inductance
Point is connected, and as transmits signal port.
In the above-mentioned technical solutions, the first filter circuit also includes the 9th electric capacity, the 9th electric capacity one end and the 5th inductance and
Common node between 7th inductance is connected, other end ground connection；Second filter circuit also includes the tenth electric capacity, the tenth electric capacity one end
Common node between the 6th inductance and the 8th inductance is connected, other end ground connection.
In the above-mentioned technical solutions, the first 3dB electric bridges, the 2nd 3dB electric bridges, the 3rd 3dB electric bridges, the 4th 3dB electric bridges are knot
Structure identical 3dB electric bridges, 3dB electric bridges are made on a ceramic substrate by ultra tiny micro-strip thin-film technique.
In the above-mentioned technical solutions, ceramic substrate is the aluminum oxide ceramic substrate that thickness is not more than 0.5mm.
In the above-mentioned technical solutions, 3dB electric bridges are the 3dB Lange electric bridges that S types are bent.
In the above-mentioned technical solutions, the first mixer diode, the second mixer diode, the 3rd mixer diode, the 4th mix
Frequency diode is Schottky diode.
In the above-mentioned technical solutions, the first 3dB electric bridges, the 2nd 3dB electric bridges, the 3rd 3dB electric bridges, the 4th 3dB electric bridges, first
Electric capacity, the first inductance, the second electric capacity, the second inductance, the 3rd electric capacity, the 3rd inductance, the 4th electric capacity, the 4th inductance, the 5th electric capacity,
5th inductance, the 6th electric capacity, the 6th inductance, the 7th electric capacity, the 7th inductance, the 8th electric capacity, the 8th inductance, the first two poles of mixing
Pipe, the connecting line between the second mixer diode, the 3rd mixer diode, the 4th mixer diode are thin by ultra tiny micro-strip
Membrane process makes on a ceramic substrate.
In the above-mentioned technical solutions, the first electric capacity, the first inductance, the second electric capacity, the second inductance, the 3rd electric capacity, the 3rd electricity
Sense, the 4th electric capacity, the 4th inductance, the 5th electric capacity, the 5th inductance, the 6th electric capacity, the 6th inductance, the 7th electric capacity, the 7th inductance,
Eight electric capacity, the 8th inductance, the first mixer diode, the second mixer diode, the 3rd mixer diode, the 4th mixer diode are equal
It is arranged at surface patch technique between corresponding connecting line.
A kind of miniaturization double balanced mixer provided in an embodiment of the present invention, it is adaptable to the miniaturization of moving communicating field
Microwave radio circuit.When the miniaturization double balanced mixer is used for down coversion, due to the reversal of diode, therefore total mid-frequency noise
It is zero that electric current, which is just offset, therefore double flat weighing apparatus balanced mixer can offset the noise of local oscillator introducing.In addition, the present invention is implemented
Miniaturization double balanced mixer local oscillation power that example is provided is high, local oscillator isolation is good, dynamic range is big, conversion loss is small, to RF
Even product have inhibitory action；Using bending Lange electric bridge, the volume of double balanced mixer can be further reduced, more favorably
In miniaturization.Connecting line between Lange electric bridge and each device is produced on ceramic substrate by ultra tiny micro-strip thin-film technique
On, the steep property of band lines is high, micro-strip line width and microstrip line stripe pitch is thin, precision is high；The simple compact, small volume of circuit structure；And
Production efficiency is high, cost is low.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write
Specifically noted structure is realized and obtained in book, claims and accompanying drawing.
Below by drawings and examples, technical scheme is described in further detail.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for specification, the reality with the present invention
Applying example is used to explain the present invention together, is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of diode double balanced mixer in the prior art；
Fig. 2 is the structure chart of miniaturization double balanced mixer in the embodiment of the present invention；
Fig. 3 is the structure chart of S types bending Lange electric bridge in the embodiment of the present invention；
Fig. 4 is the circuit diagram of miniaturization double balanced mixer in embodiment one；
Fig. 5 is the structure domain of miniaturization double balanced mixer in embodiment one；
Fig. 6 is the detailed structure view of miniaturization double balanced mixer in embodiment one；
The isolation test curve map that Fig. 7 is LO → IF in embodiment one；
Fig. 8 is the circuit diagram of miniaturization double balanced mixer in embodiment two；
Fig. 9 is the structure domain of miniaturization double balanced mixer in embodiment two.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment to the present invention is described in detail, it is to be understood that the guarantor of the present invention
Shield scope is not limited by embodiment.
Double balanced mixer is miniaturized there is provided one kind according to embodiments of the present invention, Fig. 2 is the double balanced mixings of the miniaturization
The structure chart of device, is specifically included：First 3dB electric bridges, the 2nd 3dB electric bridges, the 3rd 3dB electric bridges, the 4th 3dB electric bridges, the first impedance
Match circuit, the second impedance matching circuit, the 3rd impedance matching circuit, the 4th impedance matching circuit, the first mixer diode D1,
Second mixer diode D2, the 3rd mixer diode D3, the 4th mixer diode D4, the first filter circuit, the second filter circuit.
Wherein, as shown in Fig. 2 the straight-through end DIR1 of the first 3dB electric bridges is connected with the input IN3 of the 3rd 3dB electric bridges, the
The coupled end COU1 of one 3dB electric bridges is connected with the isolation end ISO4 of the 4th 3dB electric bridges；The straight-through end DIR2 of 2nd 3dB electric bridges with
The isolation end ISO3 of 3rd 3dB electric bridges is connected, the coupled end COU2 of the 2nd 3dB electric bridges and the input IN4 phases of the 4th 3dB electric bridges
Even；The isolation end ISO1 and the 2nd 3dB electric bridges of first 3dB electric bridges isolation end ISO2 are grounded.
The straight-through end DIR3 of 3rd 3dB electric bridges by after the first impedance matching circuit with the first mixer diode D1 first
Pin is connected, and the first mixer diode D1 second pin is connected with the first filter circuit.The coupled end COU4 of 4th 3dB electric bridges
It is connected by the negative electrode after the second impedance matching circuit with the second mixer diode D2, the second mixer diode D2 anode and
Two filter circuits are connected.The coupled end COU3 of 3rd 3dB electric bridges by after the 3rd impedance matching circuit with the 3rd mixer diode
D3 anode is connected, and the 3rd mixer diode D3 negative electrode is connected with the first filter circuit.The straight-through end DIR4 of 4th 3dB electric bridges
By being connected after the 4th impedance matching circuit with the 4th mixer diode D4 the first pin, the second of the 4th mixer diode D4
Pin is connected with the second filter circuit.
In addition, the first filter circuit is also connected with the second filter circuit, between the first filter circuit and the second filter circuit
Common node for transmission signal port.The transmission signal port can export intermediate-freuqncy signal, can also input local oscillation signal, tool
Depending on body is according to actual use situation.
Wherein, the first mixer diode D1 the first pin is that anode, second pin are negative electrode, and the 4th mixer diode
D4 the first pin is that negative electrode, second pin are anode.Or, the first mixer diode D1 the first pin is negative electrode, second
Pin is anode, and the 4th mixer diode D4 the first pin is that anode, second pin are negative electrode.The embodiment of the present invention is provided
Miniaturization double balanced mixer can be applied to different scenes：For example, PORT1, PORT2 port meet input RF (Radio respectively
Frequency, radio frequency) signal and LO (Local Oscillator, local oscillator) signal, PORT3 ports output IF
(Intermediate Frequency, intermediate frequency) signal；Or, PORT1, PORT3 port connect input IF signals and LO letters respectively
Number, PORT2 ports output RF signals；The mode of connection with specific reference to the first mixer diode D1 and the 4th mixer diode D4 is true
It is fixed.
It is preferred that, above-mentioned first 3dB electric bridges, the 2nd 3dB electric bridges, the 3rd 3dB electric bridges, the 4th 3dB electric bridges are that structure is identical
3dB electric bridges, the 3dB electric bridges by ultra tiny micro-strip thin-film technique make on a ceramic substrate.The ceramic substrate specifically can be with
It is not more than 0.5mm aluminum oxide ceramic substrate for thickness.
It is preferred that, in embodiments of the present invention, 3dB electric bridges are specifically as follows the 3dB Lange electric bridges of S types bending, and frequency is got over
Height, the volume of bridge is smaller；The structure chart of 3dB electric bridges is referring specifically to shown in Fig. 3.
By carrying out S type bending processes to Lange electric bridge, be conducive to reducing the volume of whole circuit, the orchid after bending process
The size of lattice electric bridge can reduce half.The 3dB Langes electric bridge is made on a ceramic substrate by ultra tiny micro-strip thin-film technique
Afterwards, 900MHz Lange bridge dimensions size is 15.7mm × 5.7mm × 0.5mm (length x width x thickness)；2GHz Langes
Bridge dimensions size：15.7mm×3.0mm×0.5mm.
It is preferred that, the first mixer diode D1, the second mixer diode D2, the 3rd mixer diode D3, the 4th mixing two
Pole pipe D4 is Schottky diode.HSD276A can specifically be used.
The structure and application scenarios of the miniaturization double balanced mixer is discussed in detail respectively below by two embodiments.
Embodiment one
In embodiment one, the first mixer diode D1 the first pin is that anode, second pin are negative electrode, and the 4th mixed
Frequency diode D4 the first pin is that negative electrode, second pin are anode, referring specifically to shown in Fig. 4, the first impedance matching circuit bag
Include the first electric capacity C1 and the first inductance L1, first electric capacity C1 one end is connected with the straight-through end DIR3 of the 3rd 3dB electric bridges, the other end with
First mixer diode D1 the first pin (i.e. anode) is connected；The of first inductance L1 one end and the first mixer diode D1
One pin (i.e. anode) is connected, other end ground connection.Second impedance matching circuit includes the second electric capacity C2 and the second inductance L2, second
Electric capacity C2 one end is connected with the coupled end COU4 of the 4th 3dB electric bridges, and the other end is connected with the second mixer diode D2 negative electrode；The
Two inductance L2 one end is connected with the second mixer diode D2 negative electrode, other end ground connection.
3rd impedance matching circuit includes the 3rd electric capacity C3 and the 3rd inductance L3, the 3rd electric capacity C3 one end and the 3rd 3dB electricity
The coupled end COU3 of bridge is connected, and the other end is connected with the 3rd mixer diode D3 anode；3rd inductance L3 one end and the 3rd
Mixer diode D3 anode is connected, other end ground connection.4th impedance matching circuit includes the 4th electric capacity C4 and the 4th inductance L4,
4th electric capacity C4 one end is connected with the straight-through end DIR4 of the 4th 3dB electric bridges, and the other end draws with the first of the 4th mixer diode D4
Pin (i.e. negative electrode) is connected；4th inductance L4 one end is connected with the 4th mixer diode D4 the first pin (i.e. negative electrode), another
End ground connection.
As shown in figure 4, the first filter circuit includes the 5th electric capacity C5, the 5th inductance L5, the 7th electric capacity C7 and the 7th inductance
L7；5th electric capacity C5 one end ground connection, the other end passes sequentially through one with the 7th electric capacity C7 after the 5th inductance L5, the 7th inductance L7
End is connected, and the 7th electric capacity C7 other end ground connection；5th electric capacity C5 and the 5th inductance L5 common node and the first mixing two
Pole pipe D1 second pin (i.e. negative electrode) is connected, the 7th electric capacity C7 and the 7th inductance L7 common node and the 3rd mixer diode
D3 negative electrode is connected.
Second filter circuit includes the 6th electric capacity C6, the 6th inductance L6, the 8th electric capacity C8 and the 8th inductance L8；6th electric capacity
C6 one end ground connection, the other end is connected after passing sequentially through the 6th inductance L6, the 8th inductance L8 with the 8th electric capacity C8 one end, and the
Eight electric capacity C8 other end ground connection；6th electric capacity C6 and the 6th inductance L6 common node and the second mixer diode D2 anode
It is connected, the 8th electric capacity C8 and the 8th inductance L8 common node and the 4th mixer diode D4 second pin (i.e. anode) phase
Even.
Common node between 5th inductance and the 7th inductance and the common node phase between the 6th inductance and the 8th inductance
Even, the node is the PORT3 in transmission signal port, i.e. Fig. 4.
When making the miniaturization double balanced mixer that embodiment one is provided, first with ultra tiny micro-strip thin-film technique system
Make substrate.While four 3dB electric bridges are made on a ceramic substrate by ultra tiny micro-strip thin-film technique, the first 3dB electricity
Bridge, the 2nd 3dB electric bridges, the 3rd 3dB electric bridges, the 4th 3dB electric bridges, the first electric capacity C1, the first inductance L1, the second electric capacity C2, second
Inductance L2, the 3rd electric capacity C3, the 3rd inductance L3, the 4th electric capacity C4, the 4th inductance L4, the 5th electric capacity C5, the 5th inductance L5, the 6th
Electric capacity C6, the 6th inductance L6, the 7th electric capacity C7, the 7th inductance L7, the 8th electric capacity C8, the 8th inductance L8, the first mixer diode
Connecting line between D1, the second mixer diode D2, the 3rd mixer diode D3, the 4th mixer diode D4 also passes through ultra micro
Trickle band thin-film technique makes on a ceramic substrate.Substrate circuit structure chart is shown in Figure 5.
Further, the first electric capacity C1, the first inductance L1, the second electric capacity C2, the second inductance L2, the 3rd electric capacity C3, the 3rd
Inductance L3, the 4th electric capacity C4, the 4th inductance L4, the 5th electric capacity C5, the 5th inductance L5, the 6th electric capacity C6, the 6th inductance L6, the 7th
Electric capacity C7, the 7th inductance L7, the 8th electric capacity C8, the 8th inductance L8, the first mixer diode D1, the second mixer diode D2,
Three mixer diode D3, the 4th mixer diode D4 are arranged between corresponding connecting line with surface patch technique.Implementing
In example one, it can specifically be realized using SMT (Surface Mounted Technology, surface mounting technology) technologies.Finally
Miniaturization double balanced mixer circuit version structure chart it is shown in Figure 6.
The miniaturization double balanced mixer that embodiment one is provided can be used for realizing up-conversion as needed, in embodiment one
In, PORT1, PORT3 port connect input IF signals and LO signals, the RF signals that PORT2 ports output frequency is moved up respectively.Example
Such as, the incoming frequency of PORT1 ports is 915.25MHz, and the incoming frequency of PORT3 ports is 1.5MHz, then PORT2 ports is defeated
Go out frequency for 916.75MHz.
It is preferred that, shown in Figure 6, in embodiment one, the first filter circuit also includes the 9th electric capacity C9, the 9th electric capacity
Common node between C9 one end and the 5th inductance L5 and the 7th inductance L7 is connected, other end ground connection；Second filter circuit is also wrapped
The tenth electric capacity C10 is included, the tenth electric capacity C10 one end is connected with the common node between the 6th inductance L6 and the 8th inductance L8, another
End ground connection.9th electric capacity C9 and the tenth electric capacity C10 effect is similar, is used to adjust the performance of filter circuit, works as filtered electrical
When road can reach filtering requirements, it is not necessary to be further added by the 9th electric capacity C9 and the tenth electric capacity C10.
Furthermore it is preferred that, shown in Figure 6, the miniaturization double balanced mixer that embodiment one is provided also includes debugging electricity
R1 is hindered, the debugging resistance R1 one end is connected with the common node between the 5th inductance and the 7th inductance, the other end and the 6th inductance
And the 8th common node between inductance is connected.Debugging resistance R1 is generally 0 Europe resistance, for debugging reserved location, Ke Yigen
According to needing to decide whether to install, or other values are selected.Wherein, debugging resistance R1 can also be replaced by inductance, and phase can be achieved
The function of answering.
In embodiment one, it is 9.9 that the miniaturization double balanced mixer, which is specifically produced on dielectric constant, and thickness is 0.5mm
Al2O3On ceramic substrate, size is 16.6mm × 17mm × 0.5mm, and mixer diode uses Schottky diode.Adopt
With the signal source of Agilent, frequency spectrograph, the performance indications parameter that Network Analyzer measures the miniaturization double balanced mixer is as follows：
(1) conversion loss：-7.9dB.Keep VLOIt is constant, the radiofrequency signal of an appropriate power is inputted, by the test of frequency spectrograph
Point is beaten on the IF-FRE 916.75MHz after frequency conversion, and it is conversion loss that the value measured and radio-frequency input signals, which are subtracted each other,.
(2) 1dB compression points：-2.8dB.The power of radio-frequency input signals, the signal after observation frequency conversion are continuously increased during test
916.75MHz, when in linear scope frequency variation signal can with input signal increase, it is linearly increasing, until input signal increase
1dB, and output signal keeps constant, the measured value of frequency variation signal now is exactly 1dB compression points.
(3) isolation：There are two kinds of method of testings, one kind is tested with Network Analyzer, the two-port one of test is terminated
Input signal a, terminating load is tested；Another method is tested with frequency spectrograph, and what is so measured is dynamic
Isolation under working condition.Tested in embodiment one using second method.
RF→LO：-36dB；
RF→IF：-32dB；
LO→IF：-38dB.LO → IF isolation test curve map is shown in Figure 7.
Embodiment two
In embodiment two, the first mixer diode D1 the first pin is that negative electrode, second pin are anode, and the 4th mixed
Frequency diode D4 the first pin is that anode, second pin are negative electrode.The miniaturization double balanced mixer that embodiment two is provided
Impedance matching circuit, the structure of filter circuit are identical with what is provided in embodiment one, do not repeat herein.The miniaturization double flat weighs
The circuit diagram and structure domain of frequency mixer are respectively referring to Fig. 8 and Fig. 9.
The frequency of input can be changed into by the miniaturization double balanced mixer that embodiment two is provided for realizing down coversion
1.5MHz or 90MHz frequency.Specifically, the first 3dB electric bridges and the 2nd 3dB electric bridges respectively believe RF input signals and LO inputs
Number it is divided into two-way, as the input of the 3rd 3dB electric bridges and the 4th 3dB electric bridges, the signal of two-way exports IF after being mixed respectively
Signal.PORT1, PORT2 port connect input rf signal and LO signals, PORT3 ports output IF signals respectively.For example, PORT1 ends
The incoming frequency of mouth is 916.75MHz, and the incoming frequency of PORT2 ports is 915.25MHz, then PORT3 ports output frequency
For 1.5MHz.
The miniaturization double balanced mixer that embodiment two is provided, due to the reversal of diode, therefore total mid-frequency noise electric current is just
Good offset is zero, therefore double flat weighing apparatus balanced mixer can offset the noise of local oscillator introducing.
It should be noted that in embodiments of the present invention, four terminals of 3dB electric bridges can be as input, this Shen
Please in four terminals of 3dB electric bridges are distinguished just for the sake of convenient description with input, straight-through end, coupled end, isolation end.Example
Such as, in embodiment one and embodiment two, the isolation ends of the first 3dB electric bridges can also as signal input, now accordingly
, the input end grounding of the first 3dB electric bridges.
A kind of miniaturization double balanced mixer provided in an embodiment of the present invention, it is adaptable to the miniaturization of moving communicating field
Microwave radio circuit.When the miniaturization double balanced mixer is used for down coversion, due to the reversal of diode, therefore total mid-frequency noise
It is zero that electric current, which is just offset, therefore double flat weighing apparatus balanced mixer can offset the noise of local oscillator introducing.In addition, the present invention is implemented
Miniaturization double balanced mixer local oscillation power that example is provided is high, local oscillator isolation is good, dynamic range is big, conversion loss is small, to RF
Even product have inhibitory action；Using bending Lange electric bridge, the volume of double balanced mixer can be further reduced, more favorably
In miniaturization.Connecting line between Lange electric bridge and each device is produced on ceramic substrate by ultra tiny micro-strip thin-film technique
On, the steep property of band lines is high, micro-strip line width and microstrip line stripe pitch is thin, precision is high；The simple compact, small volume of circuit structure；And
Production efficiency is high, cost is low.
The present invention can have a variety of various forms of embodiments, above by taking Fig. 2-Fig. 9 as an example with reference to accompanying drawing to this hair
Bright technical scheme explanation for example, this is not meant to that the instantiation that the present invention is applied can only be confined to specific flow
Or in example structure, one of ordinary skill in the art is it is to be appreciated that specific embodiment presented above is a variety of
Some examples in its preferred usage, the embodiment of any embodiment the claims in the present invention all should be wanted in technical solution of the present invention
Within the scope of asking protection.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the present invention's
Within protection domain.
Claims (11)
1. one kind miniaturization double balanced mixer, it is characterised in that including：First 3dB electric bridges, the 2nd 3dB electric bridges, the 3rd 3dB
Electric bridge, the 4th 3dB electric bridges, the first impedance matching circuit, the second impedance matching circuit, the 3rd impedance matching circuit, the 4th impedance
Match circuit, the first mixer diode, the second mixer diode, the 3rd mixer diode, the 4th mixer diode, the first filtering
Circuit, the second filter circuit；
The straight-through end of the first 3dB electric bridges is connected with the input of the 3rd 3dB electric bridges, the coupling of the first 3dB electric bridges
End is closed with the isolation end of the 4th 3dB electric bridges to be connected；The straight-through end of the 2nd 3dB electric bridges and the 3rd 3dB electric bridges
Isolation end is connected, and the coupled end of the 2nd 3dB electric bridges is connected with the input of the 4th 3dB electric bridges；The first 3dB electricity
The isolation end of the isolation end of bridge and the 2nd 3dB electric bridges is grounded；
The straight-through end of the 3rd 3dB electric bridges by after first impedance matching circuit with first mixer diode
One pin is connected, and the second pin of first mixer diode is connected with first filter circuit；
The coupled end of the 4th 3dB electric bridges passes through the moon after second impedance matching circuit with second mixer diode
Extremely it is connected, the anode of second mixer diode is connected with second filter circuit；
The coupled end of the 3rd 3dB electric bridges passes through the sun after the 3rd impedance matching circuit with the 3rd mixer diode
Extremely it is connected, the negative electrode of the 3rd mixer diode is connected with first filter circuit；
The straight-through end of the 4th 3dB electric bridges by after the 4th impedance matching circuit with the 4th mixer diode
One pin is connected, and the second pin of the 4th mixer diode is connected with second filter circuit；
First filter circuit is also connected with second filter circuit, first filter circuit and second filtered electrical
Common node between road is transmission signal port.
2. miniaturization double balanced mixer according to claim 1, it is characterised in that
First pin of first mixer diode is that anode, second pin are negative electrode, and the 4th mixer diode
First pin is that negative electrode, second pin are anode；Or
First pin of first mixer diode is that negative electrode, second pin are anode, and the 4th mixer diode
First pin is that anode, second pin are negative electrode.
3. miniaturization double balanced mixer according to claim 1, it is characterised in that
First impedance matching circuit includes the first electric capacity and the first inductance, described first electric capacity one end and the 3rd 3dB
The straight-through end of electric bridge is connected, and the other end is connected with the first pin of first mixer diode；One end of first inductance
It is connected with the first pin of first mixer diode, other end ground connection；
Second impedance matching circuit includes the second electric capacity and the second inductance, described second electric capacity one end and the 4th 3dB electric bridges
Coupled end be connected, the other end is connected with the negative electrode of second mixer diode；One end of second inductance and described the
The negative electrode of two mixer diodes is connected, other end ground connection；
3rd impedance matching circuit includes the 3rd electric capacity and the 3rd inductance, described 3rd electric capacity one end and the 3rd 3dB electric bridges
Coupled end be connected, the other end is connected with the anode of the 3rd mixer diode；One end of 3rd inductance and described the
The anode of three mixer diodes is connected, other end ground connection；
4th impedance matching circuit includes the 4th electric capacity and the 4th inductance, described 4th electric capacity one end and the 4th 3dB electric bridges
Straight-through end be connected, the other end is connected with the first pin of the 4th mixer diode；One end of 4th inductance and institute
The first pin for stating the 4th mixer diode is connected, other end ground connection.
4. miniaturization double balanced mixer according to claim 3, it is characterised in that
First filter circuit includes the 5th electric capacity, the 5th inductance, the 7th electric capacity and the 7th inductance；The one of 5th electric capacity
End ground connection, the other end is connected after passing sequentially through the 5th inductance, the 7th inductance with one end of the 7th electric capacity, described
The other end ground connection of 7th electric capacity；The common node and first mixer diode of 5th electric capacity and the 5th inductance
Second pin be connected, the common node of the 7th electric capacity and the 7th inductance and the negative electrode of the 3rd mixer diode
It is connected；
Second filter circuit includes the 6th electric capacity, the 6th inductance, the 8th electric capacity and the 8th inductance；The one of 6th electric capacity
End ground connection, the other end is connected after passing sequentially through the 6th inductance, the 8th inductance with one end of the 8th electric capacity, described
The other end ground connection of 8th electric capacity；The common node and second mixer diode of 6th electric capacity and the 6th inductance
Anode be connected, the common node of the 8th electric capacity and the 8th inductance and the second pin of the 4th mixer diode
It is connected；
Between common node and the 6th inductance and the 8th inductance between 5th inductance and the 7th inductance
Common node be connected, as transmit signal port.
5. miniaturization double balanced mixer according to claim 4, it is characterised in that
First filter circuit also includes the 9th electric capacity, described 9th electric capacity one end and the 5th inductance and the 7th electricity
Common node between sense is connected, other end ground connection；
Second filter circuit also includes the tenth electric capacity, described tenth electric capacity one end and the 6th inductance and the 8th electricity
Common node between sense is connected, other end ground connection.
6. according to any described miniaturization double balanced mixers of claim 1-5, it is characterised in that the first 3dB electric bridges,
The 2nd 3dB electric bridges, the 3rd 3dB electric bridges, the 4th 3dB electric bridges are structure identical 3dB electric bridges, the 3dB electricity
Bridge is made on a ceramic substrate by ultra tiny micro-strip thin-film technique.
7. miniaturization double balanced mixer according to claim 6, it is characterised in that the ceramic substrate is that thickness is little
In 0.5mm aluminum oxide ceramic substrate.
8. miniaturization double balanced mixer according to claim 6, it is characterised in that the 3dB electric bridges are what S types were bent
3dB Lange electric bridges.
9. according to any described miniaturization double balanced mixers of claim 1-5, it is characterised in that two poles of the first mixing
Pipe, the second mixer diode, the 3rd mixer diode, the 4th mixer diode are Schottky diode.
10. miniaturization double balanced mixer according to claim 4, it is characterised in that the first 3dB electric bridges, second
3dB electric bridges, the 3rd 3dB electric bridges, the 4th 3dB electric bridges, the first electric capacity, the first inductance, the second electric capacity, the second inductance, the 3rd electric capacity,
3rd inductance, the 4th electric capacity, the 4th inductance, the 5th electric capacity, the 5th inductance, the 6th electric capacity, the 6th inductance, the 7th electric capacity, the 7th
Inductance, the 8th electric capacity, the 8th inductance, the first mixer diode, the second mixer diode, the 3rd mixer diode, the 4th mixing
Connecting line between diode is made on a ceramic substrate by ultra tiny micro-strip thin-film technique.
11. miniaturization double balanced mixer according to claim 10, it is characterised in that first electric capacity, the first electricity
Sense, the second electric capacity, the second inductance, the 3rd electric capacity, the 3rd inductance, the 4th electric capacity, the 4th inductance, the 5th electric capacity, the 5th inductance,
Six electric capacity, the 6th inductance, the 7th electric capacity, the 7th inductance, the 8th electric capacity, the 8th inductance, the first mixer diode, the second mixing two
Pole pipe, the 3rd mixer diode, the 4th mixer diode are arranged between corresponding connecting line with surface patch technique.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410723386.9A CN104702218B (en) | 2014-12-02 | 2014-12-02 | One kind miniaturization double balanced mixer |
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| CN201410723386.9A CN104702218B (en) | 2014-12-02 | 2014-12-02 | One kind miniaturization double balanced mixer |
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| CN104702218B true CN104702218B (en) | 2017-10-17 |
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| CN112117972A (en) * | 2020-08-28 | 2020-12-22 | 北京无线电测量研究所 | Quadrature mixer circuit |
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| GB705685A (en) * | 1951-04-19 | 1954-03-17 | Marconi Wireless Telegraph Co | Improvements in or relating to mixer circuit arrangements for use at ultra high frequencies |
| US3659206A (en) * | 1970-07-16 | 1972-04-25 | Collins Radio Co | Microwave balanced mixer circuit |
| US4947062A (en) * | 1988-05-19 | 1990-08-07 | Adams Russell Electronics Co., Inc. | Double balanced mixing |
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| CN101510757A (en) * | 2009-03-06 | 2009-08-19 | 电子科技大学 | Millimeter-wave monolithic quadrature down converter |
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|---|---|---|---|---|
| CN204190706U (en) * | 2014-12-02 | 2015-03-04 | 庄昆杰 | A kind of microminiaturized double balanced mixer |
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2014
- 2014-12-02 CN CN201410723386.9A patent/CN104702218B/en not_active Expired - Fee Related
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| US3659206A (en) * | 1970-07-16 | 1972-04-25 | Collins Radio Co | Microwave balanced mixer circuit |
| US4947062A (en) * | 1988-05-19 | 1990-08-07 | Adams Russell Electronics Co., Inc. | Double balanced mixing |
| CN101436870A (en) * | 2007-11-14 | 2009-05-20 | 深圳国人通信有限公司 | Microwave low-waveband ultra-minitype auto-gain control heterodyne type acceptance die set |
| CN101510757A (en) * | 2009-03-06 | 2009-08-19 | 电子科技大学 | Millimeter-wave monolithic quadrature down converter |
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