CN204190706U - A kind of microminiaturized double balanced mixer - Google Patents
A kind of microminiaturized double balanced mixer Download PDFInfo
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- CN204190706U CN204190706U CN201420748671.1U CN201420748671U CN204190706U CN 204190706 U CN204190706 U CN 204190706U CN 201420748671 U CN201420748671 U CN 201420748671U CN 204190706 U CN204190706 U CN 204190706U
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Abstract
The utility model discloses a kind of microminiaturized double balanced mixer, comprising: a 3dB electric bridge, the 2nd 3dB electric bridge, the 3rd 3dB electric bridge, the 4th 3dB electric bridge, 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 signal transmission port.This microminiaturized double balanced mixer local oscillation power is high, local oscillator isolation is good, dynamic range is large, conversion loss is little, have inhibitory action to the even product of RF, and volume size is little, is applicable to miniaturized microwave radio circuit.
Description
Technical field
The utility model relates to frequency mixer technical field in the communications field, particularly, relates to a kind of microminiaturized double balanced mixer.
Background technology
Frequency mixer is parts indispensable in radio frequency microwave circuit system.No matter be microwave communication, radar, remote control, remote sensing or scouting and electronic countermeasures, and microwave measurement system, all microwave signal frequency mixer must be dropped to medium and low frequency to process.In practice, most AM (AmplitudeModulation, amplitude modulation), SSB (Single Side Band, single-side belt) and digital transmitter all need frequency mixer signal frequency converting to a higher frequency, is then transmitted into aerial; Superheterodyne receiver then needs to utilize frequency mixer the signal frequency converting received to lower frequency---intermediate frequency.Receiver must use the signal of this lower frequency, because the signal of this frequency easily effectively amplifies and filtering by intermediater-frequency stage, easily optimizes frequency range, thus improves gain and the selectivity of receiver.
Existing double balanced mixer mostly is diode double balanced mixer or CMOS double balanced mixer, the schematic diagram of diode double balanced mixer is shown in Figure 1, it generally adopts thick-film technique to make, it is large that passive component accounts for area, volume is large, is not suitable in the microwave radio circuit of the miniaturization of moving communicating field.
Utility model content
The utility model is to overcome the defect that in prior art, double balanced mixer volume is larger, according to an aspect of the present utility model, proposes a kind of microminiaturized double balanced mixer.
The microminiaturized double balanced mixer of the one that the utility model embodiment provides, comprising: a 3dB electric bridge, the 2nd 3dB electric bridge, the 3rd 3dB electric bridge, the 4th 3dB electric bridge, 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; The straight-through end of the one 3dB electric bridge is connected with the input of the 3rd 3dB electric bridge, and the coupled end of a 3dB electric bridge is connected with the isolation end of the 4th 3dB electric bridge; The straight-through end of the 2nd 3dB electric bridge is connected with the isolation end of the 3rd 3dB electric bridge, and the coupled end of the 2nd 3dB electric bridge is connected with the input of the 4th 3dB electric bridge; The isolation end of the one 3dB electric bridge and the equal ground connection of isolation end of a 3dB electric bridge; The straight-through end of the 3rd 3dB electric bridge is by being connected with the first pin of the first mixer diode after the first impedance matching circuit, and the second pin of the first mixer diode is connected with the first filter circuit; The coupled end of the 4th 3dB electric bridge is by being connected with the negative electrode of the second mixer diode after the second impedance matching circuit, and the anode of the second mixer diode is connected with the second filter circuit; The coupled end of the 3rd 3dB electric bridge is by being connected with the anode of the 3rd mixer diode after the 3rd impedance matching circuit, and the negative electrode of the 3rd mixer diode is connected with the first filter circuit; The straight-through end of the 4th 3dB electric bridge is by being connected with the first pin of the 4th mixer diode after the 4th impedance matching circuit, and the second pin of the 4th mixer diode is connected with the second filter circuit; First filter circuit is also connected with the second filter circuit, and the common node between the first filter circuit and the second filter circuit is signal transmission port.
In technique scheme, the first pin of the first mixer diode is anode, the second pin is negative electrode, and the first pin of the 4th mixer diode be negative electrode, the second pin is anode; Or
First pin of the first mixer diode is negative electrode, the second pin is anode, and the first pin of the 4th mixer diode be anode, the second pin is negative electrode.
In technique scheme, the first impedance matching circuit comprises the first electric capacity and the first inductance, and first electric capacity one end is connected with the straight-through end of the 3rd 3dB electric bridge, and the other end is connected with the first pin of the first mixer diode; One end of first inductance is connected with the first pin of the first mixer diode, other end ground connection; Second impedance matching circuit comprises the second electric capacity and the second inductance, and second electric capacity one end is connected with the coupled end of the 4th 3dB electric bridge, 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 comprises the 3rd electric capacity and the 3rd inductance, and the 3rd electric capacity one end is connected with the coupled end of the 3rd 3dB electric bridge, and the other end is connected with the anode of the 3rd mixer diode; One end of 3rd inductance is connected with the anode of the 3rd mixer diode, other end ground connection; 4th impedance matching circuit comprises the 4th electric capacity and the 4th inductance, and the 4th electric capacity one end is connected with the straight-through end of the 4th 3dB electric bridge, and the other end is connected with the first pin of the 4th mixer diode; One end of 4th inductance is connected with the first pin of the 4th mixer diode, other end ground connection.
In technique scheme, the first filter circuit comprises the 5th electric capacity, the 5th inductance, the 7th electric capacity and the 7th inductance; One end ground connection of the 5th electric capacity, the other end successively by being connected with one end of the 7th electric capacity after the 5th inductance, the 7th inductance, the other end ground connection of the 7th electric capacity; 5th electric capacity is connected with the second pin of the first mixer diode with the common node of the 5th inductance, and the 7th electric capacity is connected with the negative electrode of the 3rd mixer diode with the common node of the 7th inductance; Second filter circuit comprises the 6th electric capacity, the 6th inductance, the 8th electric capacity and the 8th inductance; One end ground connection of the 6th electric capacity, the other end successively by being connected with one end of the 8th electric capacity after the 6th inductance, the 8th inductance, the other end ground connection of the 8th electric capacity; 6th electric capacity is connected with the anode of the second mixer diode with the common node of the 6th inductance, and the 8th electric capacity is connected with the second pin of the 4th mixer diode with the common node of the 8th inductance; Common node between 5th inductance and the 7th inductance is connected with the common node between the 6th inductance and the 8th inductance, is signal transmission port.
In technique scheme, the first filter circuit also comprises the 9th electric capacity, and the 9th electric capacity one end is connected with the common node between the 5th inductance and the 7th inductance, other end ground connection; Second filter circuit also comprises the tenth electric capacity, and the tenth electric capacity one end is connected with the common node between the 6th inductance and the 8th inductance, other end ground connection.
In technique scheme, a 3dB electric bridge, the 2nd 3dB electric bridge, the 3rd 3dB electric bridge, the 4th 3dB electric bridge are the 3dB electric bridge that structure is identical, and 3dB electric bridge is made on a ceramic substrate by the trickle band thin-film technique of ultra micro.
In technique scheme, ceramic substrate is the aluminum oxide ceramic substrate that thickness is not more than 0.5mm.
In technique scheme, 3dB electric bridge is the 3dB Lange electric bridge that S type is bending.
In technique scheme, the first mixer diode, the second mixer diode, the 3rd mixer diode, the 4th mixer diode are Schottky diode.
In technique scheme, the connecting line between a 3dB electric bridge, the 2nd 3dB electric bridge, the 3rd 3dB electric bridge, the 4th 3dB electric bridge, the 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, 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 mixer diode is all made on a ceramic substrate by the trickle band thin-film technique of ultra micro.
In technique scheme, the 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, 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 mixer diode are all arranged between corresponding connecting line with surface patch technique.
The microminiaturized double balanced mixer of the one that the utility model embodiment provides, is applicable to the microwave radio circuit of the miniaturization of moving communicating field.When this microminiaturized double balanced mixer is used for down-conversion, due to the reversal of diode, thus total mid-frequency noise electric current just in time to offset be zero, therefore this pair of balance balanced mixer can offset the noise that local oscillator is introduced.In addition, the microminiaturized double balanced mixer local oscillation power that provides of the utility model embodiment is high, local oscillator isolation is good, dynamic range is large, conversion loss is little, have inhibitory action to the even product of RF; Adopt bending Lange electric bridge, the volume of double balanced mixer can be reduced further, be more conducive to microminiaturization.Connecting line between Lange electric bridge and each device is made on a ceramic substrate by the trickle band thin-film technique of ultra micro, and the steep property of band lines is high, microstrip line is wide and microstrip line stripe pitch is thin, precision is high; Circuit structure is simply compact, volume is little; And production efficiency is high, cost is low.
Other features and advantages of the utility model will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the utility model.The purpose of this utility model and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, does not form restriction of the present utility model with embodiment one of the present utility model.In the accompanying drawings:
Fig. 1 is the schematic diagram of diode double balanced mixer in prior art;
Fig. 2 is the structure chart of microminiaturized double balanced mixer in the utility model embodiment;
Fig. 3 is the structure chart that in the utility model embodiment, S type bends Lange electric bridge;
Fig. 4 is the circuit diagram of microminiaturized double balanced mixer in embodiment one;
Fig. 5 is the structure domain of microminiaturized double balanced mixer in embodiment one;
Fig. 6 is the detailed structure view of microminiaturized double balanced mixer in embodiment one;
Fig. 7 is the isolation test curve chart of LO → IF in embodiment one;
Fig. 8 is the circuit diagram of microminiaturized double balanced mixer in embodiment two;
Fig. 9 is the structure domain of microminiaturized double balanced mixer in embodiment two.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but is to be understood that protection range of the present utility model not by the restriction of embodiment.
According to the utility model embodiment, provide a kind of microminiaturized double balanced mixer, Fig. 2 is the structure chart of this microminiaturized double balanced mixer, specifically comprises: a 3dB electric bridge, the 2nd 3dB electric bridge, the 3rd 3dB electric bridge, the 4th 3dB electric bridge, the first impedance matching circuit, the second impedance matching circuit, the 3rd impedance matching circuit, the 4th impedance matching circuit, the first mixer diode D1, the 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 Figure 2, the straight-through end DIR1 of a 3dB electric bridge is connected with the input IN3 of the 3rd 3dB electric bridge, and the coupled end COU1 of a 3dB electric bridge is connected with the isolation end ISO4 of the 4th 3dB electric bridge; The straight-through end DIR2 of the 2nd 3dB electric bridge is connected with the isolation end ISO3 of the 3rd 3dB electric bridge, and the coupled end COU2 of the 2nd 3dB electric bridge is connected with the input IN4 of the 4th 3dB electric bridge; The isolation end ISO1 of the one 3dB electric bridge and the equal ground connection of isolation end ISO2 of a 3dB electric bridge.
The straight-through end DIR3 of the 3rd 3dB electric bridge is by being connected with first pin of the first mixer diode D1 after the first impedance matching circuit, and second pin of the first mixer diode D1 is connected with the first filter circuit.The coupled end COU4 of the 4th 3dB electric bridge is by being connected with the negative electrode of the second mixer diode D2 after the second impedance matching circuit, and the anode of the second mixer diode D2 is connected with the second filter circuit.The coupled end COU3 of the 3rd 3dB electric bridge is by being connected with the anode of the 3rd mixer diode D3 after the 3rd impedance matching circuit, and the negative electrode of the 3rd mixer diode D3 is connected with the first filter circuit.The straight-through end DIR4 of the 4th 3dB electric bridge is by being connected with first pin of the 4th mixer diode D4 after the 4th impedance matching circuit, and second pin of the 4th mixer diode D4 is connected with the second filter circuit.
In addition, the first filter circuit is also connected with the second filter circuit, and the common node between the first filter circuit and the second filter circuit is signal transmission port.This signal transmission port can export intermediate-freuqncy signal, also can input local oscillation signal, specifically determines according to actual service condition.
Wherein, first pin of the first mixer diode D1 is anode, the second pin is negative electrode, and first pin of the 4th mixer diode D4 be negative electrode, the second pin is anode..Or first pin of the first mixer diode D1 is negative electrode, the second pin is anode, and first pin of the 4th mixer diode D4 be anode, the second pin is negative electrode.The microminiaturized double balanced mixer that the utility model embodiment provides can be applicable to different scenes: such as, PORT1, PORT2 port meets input RF (RadioFrequency respectively, radio frequency) signal and LO (Local Oscillator, local oscillator) signal, PORT3 port exports IF (Intermediate Frequency, intermediate frequency) signal; Or PORT1, PORT3 port connects input IF signal and LO signal respectively, PORT2 port exports RF signal; Specifically determine according to the mode of connection of the first mixer diode D1 and the 4th mixer diode D4.
Preferably, an above-mentioned 3dB electric bridge, the 2nd 3dB electric bridge, the 3rd 3dB electric bridge, the 4th 3dB electric bridge are the 3dB electric bridge that structure is identical, and this 3dB electric bridge is made on a ceramic substrate by the trickle band thin-film technique of ultra micro.This ceramic substrate is specifically as follows the aluminum oxide ceramic substrate that thickness is not more than 0.5mm.
Preferably, in the utility model embodiment, 3dB electric bridge is specifically as follows the bending 3dB Lange electric bridge of S type, and frequency is higher, and the volume on bridge road is less; The structure chart of 3dB electric bridge is specifically shown in Figure 3.
By carrying out the bending process of S type to Lange electric bridge, be conducive to the volume reducing whole circuit, the size of the Lange electric bridge after bending process can reduce half.This 3dB Lange electric bridge is made on a ceramic substrate by the trickle band thin-film technique of ultra micro, and the Lange bridge dimensions size of 900MHz is 15.7mm × 5.7mm × 0.5mm (length x width x thickness); 2GHz Lange bridge dimensions size: 15.7mm × 3.0mm × 0.5mm.
Preferably, the first mixer diode D1, the second mixer diode D2, the 3rd mixer diode D3, the 4th mixer diode D4 are Schottky diode.Specifically HSD276A can be adopted.
Structure and the application scenarios of this microminiaturized double balanced mixer is introduced respectively in detail below by two embodiments.
Embodiment one
In embodiment one, first pin of the first mixer diode D1 is anode, the second pin is negative electrode, and first pin of the 4th mixer diode D4 be negative electrode, the second pin is anode., specifically shown in Figure 4, first impedance matching circuit comprises the first electric capacity C1 and the first inductance L 1, first electric capacity C1 one end is connected with the straight-through end DIR3 of the 3rd 3dB electric bridge, and the other end is connected with first pin (i.e. anode) of the first mixer diode D1; One end of first inductance L 1 is connected with first pin (i.e. anode) of the first mixer diode D1, other end ground connection.Second impedance matching circuit comprises the second electric capacity C2 and second inductance L 2, second electric capacity C2 one end is connected with the coupled end COU4 of the 4th 3dB electric bridge, and the other end is connected with the negative electrode of the second mixer diode D2; One end of second inductance L 2 is connected with the negative electrode of the second mixer diode D2, other end ground connection.
3rd impedance matching circuit comprises the 3rd electric capacity C3 and the 3rd inductance L the 3, three electric capacity C3 one end is connected with the coupled end COU3 of the 3rd 3dB electric bridge, and the other end is connected with the anode of the 3rd mixer diode D3; One end of 3rd inductance L 3 is connected with the anode of the 3rd mixer diode D3, other end ground connection.4th impedance matching circuit comprises the 4th electric capacity C4 and the 4th inductance L the 4, four electric capacity C4 one end is connected with the straight-through end DIR4 of the 4th 3dB electric bridge, and the other end is connected with first pin (i.e. negative electrode) of the 4th mixer diode D4; One end of 4th inductance L 4 is connected with first pin (i.e. negative electrode) of the 4th mixer diode D4, other end ground connection.
As shown in Figure 4, the first filter circuit comprises the 5th electric capacity C5, the 5th inductance L 5, the 7th electric capacity C7 and the 7th inductance L 7; One end ground connection of the 5th electric capacity C5, the other end is successively by being connected with one end of the 7th electric capacity C7 after the 5th inductance L 5, the 7th inductance L 7, and the other end ground connection of the 7th electric capacity C7; 5th electric capacity C5 is connected with second pin (i.e. negative electrode) of the first mixer diode D1 with the common node of the 5th inductance L 5, and the 7th electric capacity C7 is connected with the negative electrode of the 3rd mixer diode D3 with the common node of the 7th inductance L 7.
Second filter circuit comprises the 6th electric capacity C6, the 6th inductance L 6, the 8th electric capacity C8 and the 8th inductance L 8; One end ground connection of the 6th electric capacity C6, the other end is successively by being connected with one end of the 8th electric capacity C8 after the 6th inductance L 6, the 8th inductance L 8, and the other end ground connection of the 8th electric capacity C8; 6th electric capacity C6 is connected with the anode of the second mixer diode D2 with the common node of the 6th inductance L 6, and the 8th electric capacity C8 is connected with second pin (i.e. anode) of the 4th mixer diode D4 with the common node of the 8th inductance L 8.
Common node between 5th inductance and the 7th inductance is connected with the common node between the 6th inductance and the 8th inductance, and this node is signal transmission port, the PORT3 namely in Fig. 4.
When making the microminiaturized double balanced mixer that embodiment one provides, the trickle band thin-film technique of ultra micro is first utilized to make substrate.While four 3dB electric bridges are made on a ceramic substrate by the trickle band thin-film technique of ultra micro, one 3dB electric bridge, 2nd 3dB electric bridge, 3rd 3dB electric bridge, 4th 3dB electric bridge, first electric capacity C1, first inductance L 1, second electric capacity C2, second inductance L 2, 3rd electric capacity C3, 3rd inductance L 3, 4th electric capacity C4, 4th inductance L 4, 5th electric capacity C5, 5th inductance L 5, 6th electric capacity C6, 6th inductance L 6, 7th electric capacity C7, 7th inductance L 7, 8th electric capacity C8, 8th inductance L 8, first mixer diode D1, second mixer diode D2, 3rd mixer diode D3, connecting line between 4th mixer diode D4 is also all made on a ceramic substrate by the trickle band thin-film technique of ultra micro.Substrate circuit structure chart is shown in Figure 5.
Further, the first electric capacity C1, the first inductance L 1, second electric capacity C2, the second inductance L 2, the 3rd electric capacity C3, the 3rd inductance L 3, the 4th electric capacity C4, the 4th inductance L 4, the 5th electric capacity C5, the 5th inductance L 5, the 6th electric capacity C6, the 6th inductance L 6, the 7th electric capacity C7, the 7th inductance L 7, the 8th electric capacity C8, the 8th inductance L 8, first mixer diode D1, the second mixer diode D2, the 3rd mixer diode D3, the 4th mixer diode D4 are all arranged between corresponding connecting line with surface patch technique.In embodiment one, SMT (Surface Mounted Technology, surface mounting technology) technology specifically can be adopted to realize.The circuit plate structure figure of final microminiaturized double balanced mixer is shown in Figure 6.
The microminiaturized double balanced mixer that embodiment one provides can be used for realizing up-conversion as required, and in embodiment one, PORT1, PORT3 port connects input IF signal and LO signal respectively, the RF signal that PORT2 port output frequency moves.Such as, the incoming frequency of PORT1 port is the incoming frequency of 915.25MHz, PORT3 port is 1.5MHz, then the output frequency of PORT2 port is 916.75MHz.
Preferably, shown in Figure 6, in embodiment one, the first filter circuit also comprises the 9th electric capacity C9, and the 9th electric capacity C9 one end is connected with the common node between the 5th inductance L 5 and the 7th inductance L 7, other end ground connection; Second filter circuit also comprises the tenth electric capacity C10, and the tenth electric capacity C10 one end is connected with the common node between the 6th inductance L 6 and the 8th inductance L 8, other end ground connection.The effect of the 9th electric capacity C9 and the tenth electric capacity C10 is similar, all for regulating the performance of filter circuit, when filter circuit can reach filtering requirements, does not need to increase the 9th electric capacity C9 and the tenth electric capacity C10 again.
In addition, preferably, shown in Figure 6, the microminiaturized double balanced mixer that embodiment one provides also comprises debugging resistance R1, this debugging resistance R1 one end is connected with the common node between the 5th inductance and the 7th inductance, and the other end is connected with the common node between the 6th inductance and the 8th inductance.This debugging resistance R1 is generally 0 Europe resistance, is debugging reserved location, can determines whether install as required, or select other values.Wherein, this debugging resistance R1 also can be replaced by inductance, all can realize corresponding function.
In embodiment one, it is 9.9 that this microminiaturized double balanced mixer is specifically produced on dielectric constant, and thickness is the Al of 0.5mm
2o
3on ceramic substrate, size is 16.6mm × 17mm × 0.5mm, and mixer diode adopts Schottky diode.Adopt the signal source of Agilent, frequency spectrograph, the performance index parameter that network analyzer records this microminiaturized double balanced mixer is as follows:
(1) conversion loss :-7.9dB.Keep V
lOconstant, the radiofrequency signal of input one suitable power, the test point of frequency spectrograph beaten on the IF-FRE 916.75MHz after frequency conversion, the value recorded and radio-frequency input signals being subtracted each other is conversion loss.
(2) 1dB compression point :-2.8dB.The power of radio-frequency input signals is constantly increased during test, observe the signal 916.75MHz after frequency conversion, time in the range of linearity, frequency variation signal can with the increase of input signal, linear increase, until input signal increases 1dB, and output signal remains unchanged, the measured value of frequency variation signal is now exactly 1dB compression point.
(3) isolation: have two kinds of method of testings, one is that by the two-port one termination input signal of test, a terminating load is tested with network analyzer test; Another method is tested with frequency spectrograph, and what record like this is isolation under dynamic operating state.In embodiment one, adopt second method to test.
RF→LO：-36dB；
RF→IF：-32dB；
LO→IF：-38dB。The isolation test curve chart of LO → IF is shown in Figure 7.
Embodiment two
In embodiment two, first pin of the first mixer diode D1 is negative electrode, the second pin is anode, and first pin of the 4th mixer diode D4 be anode, the second pin is negative electrode.The impedance matching circuit of microminiaturized double balanced mixer that embodiment two provides, the structure of filter circuit with provide in embodiment one identical, do not repeat herein.The circuit diagram of this microminiaturized double balanced mixer and structure domain are respectively see Fig. 8 and Fig. 9.
The microminiaturized double balanced mixer that embodiment two provides can be used for realizing down-conversion, the frequency of input is become the frequency of 1.5MHz or 90MHz.Concrete, RF input signal and LO input signal are divided into two-way by a 3dB electric bridge and the 2nd 3dB electric bridge respectively, as the input of the 3rd 3dB electric bridge and the 4th 3dB electric bridge, export IF signal after the signal of two-way carries out mixing respectively.PORT1, PORT2 port connects input rf signal and LO signal respectively, and PORT3 port exports IF signal.Such as, the incoming frequency of PORT1 port is the incoming frequency of 916.75MHz, PORT2 port is 915.25MHz, then the output frequency of PORT3 port is 1.5MHz.
The microminiaturized double balanced mixer that embodiment two provides, due to the reversal of diode, therefore total mid-frequency noise electric current just in time to offset be zero, therefore this pair of balance balanced mixer can offset the noise that local oscillator is introduced.
It should be noted that, in the utility model embodiment, four terminals of 3dB electric bridge all as input, can be only used to convenient description with four terminals of input, straight-through end, coupled end, isolation end differentiation 3dB electric bridge in the application.Such as, in embodiment one and embodiment two, the isolation end of a 3dB electric bridge also can signal input, accordingly now, and the input end grounding of a 3dB electric bridge.
The microminiaturized double balanced mixer of the one that the utility model embodiment provides, is applicable to the microwave radio circuit of the miniaturization of moving communicating field.When this microminiaturized double balanced mixer is used for down-conversion, due to the reversal of diode, thus total mid-frequency noise electric current just in time to offset be zero, therefore this pair of balance balanced mixer can offset the noise that local oscillator is introduced.In addition, the microminiaturized double balanced mixer local oscillation power that provides of the utility model embodiment is high, local oscillator isolation is good, dynamic range is large, conversion loss is little, have inhibitory action to the even product of RF; Adopt bending Lange electric bridge, the volume of double balanced mixer can be reduced further, be more conducive to microminiaturization.Connecting line between Lange electric bridge and each device is made on a ceramic substrate by the trickle band thin-film technique of ultra micro, and the steep property of band lines is high, microstrip line is wide and microstrip line stripe pitch is thin, precision is high; Circuit structure is simply compact, volume is little; And production efficiency is high, cost is low.
The utility model can have multiple multi-form embodiment; above for Fig. 2-Fig. 9 by reference to the accompanying drawings to the technical solution of the utility model explanation for example; this does not also mean that the instantiation that the utility model is applied can only be confined in specific flow process or example structure; those of ordinary skill in the art should understand; specific embodiments provided above is some examples in multiple its preferred usage, and the execution mode of any embodiment the utility model claim all should within technical solutions of the utility model scope required for protection.
Last it is noted that the foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, although be described in detail the utility model with reference to previous embodiment, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (11)
1. a microminiaturized double balanced mixer, it is characterized in that, comprising: a 3dB electric bridge, the 2nd 3dB electric bridge, the 3rd 3dB electric bridge, the 4th 3dB electric bridge, 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;
The straight-through end of a described 3dB electric bridge is connected with the input of described 3rd 3dB electric bridge, and the coupled end of a described 3dB electric bridge is connected with the isolation end of described 4th 3dB electric bridge; The straight-through end of described 2nd 3dB electric bridge is connected with the isolation end of described 3rd 3dB electric bridge, and the coupled end of described 2nd 3dB electric bridge is connected with the input of described 4th 3dB electric bridge; The isolation end of a described 3dB electric bridge and the equal ground connection of isolation end of a described 3dB electric bridge;
The straight-through end of described 3rd 3dB electric bridge is by being connected with the first pin of described first mixer diode after described first impedance matching circuit, and the second pin of described first mixer diode is connected with described first filter circuit;
The coupled end of described 4th 3dB electric bridge is by being connected with the negative electrode of described second mixer diode after described second impedance matching circuit, and the anode of described second mixer diode is connected with described second filter circuit;
The coupled end of described 3rd 3dB electric bridge is by being connected with the anode of described 3rd mixer diode after described 3rd impedance matching circuit, and the negative electrode of described 3rd mixer diode is connected with described first filter circuit;
The straight-through end of described 4th 3dB electric bridge is by being connected with the first pin of described 4th mixer diode after described 4th impedance matching circuit, and the second pin of described 4th mixer diode is connected with described second filter circuit;
Described first filter circuit is also connected with described second filter circuit, and the common node between described first filter circuit and described second filter circuit is signal transmission port.
2. microminiaturized double balanced mixer according to claim 1, is characterized in that,
First pin of described first mixer diode is anode, the second pin is negative electrode, and the first pin of described 4th mixer diode be negative electrode, the second pin is anode; Or
First pin of described first mixer diode is negative electrode, the second pin is anode, and the first pin of described 4th mixer diode be anode, the second pin is negative electrode.
3. microminiaturized double balanced mixer according to claim 1, is characterized in that,
Described first impedance matching circuit comprises the first electric capacity and the first inductance, and described first electric capacity one end is connected with the straight-through end of described 3rd 3dB electric bridge, and the other end is connected with the first pin of described first mixer diode; One end of described first inductance is connected with the first pin of described first mixer diode, other end ground connection;
Second impedance matching circuit comprises the second electric capacity and the second inductance, and described second electric capacity one end is connected with the coupled end of described 4th 3dB electric bridge, and the other end is connected with the negative electrode of described second mixer diode; One end of described second inductance is connected with the negative electrode of described second mixer diode, other end ground connection;
3rd impedance matching circuit comprises the 3rd electric capacity and the 3rd inductance, and described 3rd electric capacity one end is connected with the coupled end of described 3rd 3dB electric bridge, and the other end is connected with the anode of described 3rd mixer diode; One end of described 3rd inductance is connected with the anode of described 3rd mixer diode, other end ground connection;
4th impedance matching circuit comprises the 4th electric capacity and the 4th inductance, and described 4th electric capacity one end is connected with the straight-through end of described 4th 3dB electric bridge, and the other end is connected with the first pin of described 4th mixer diode; One end of described 4th inductance is connected with the first pin of described 4th mixer diode, other end ground connection.
4. microminiaturized double balanced mixer according to claim 3, is characterized in that,
Described first filter circuit comprises the 5th electric capacity, the 5th inductance, the 7th electric capacity and the 7th inductance; One end ground connection of described 5th electric capacity, the other end successively by being connected with one end of described 7th electric capacity after described 5th inductance, described 7th inductance, the other end ground connection of described 7th electric capacity; Described 5th electric capacity is connected with the second pin of described first mixer diode with the common node of described 5th inductance, and described 7th electric capacity is connected with the negative electrode of described 3rd mixer diode with the common node of described 7th inductance;
Described second filter circuit comprises the 6th electric capacity, the 6th inductance, the 8th electric capacity and the 8th inductance; One end ground connection of described 6th electric capacity, the other end successively by being connected with one end of described 8th electric capacity after described 6th inductance, described 8th inductance, the other end ground connection of described 8th electric capacity; Described 6th electric capacity is connected with the anode of described second mixer diode with the common node of described 6th inductance, and described 8th electric capacity is connected with the second pin of described 4th mixer diode with the common node of described 8th inductance;
Common node between described 5th inductance and described 7th inductance is connected with the common node between described 6th inductance and described 8th inductance, is signal transmission port.
5. microminiaturized double balanced mixer according to claim 4, is characterized in that,
Described first filter circuit also comprises the 9th electric capacity, and described 9th electric capacity one end is connected with the common node between described 5th inductance and described 7th inductance, other end ground connection;
Described second filter circuit also comprises the tenth electric capacity, and described tenth electric capacity one end is connected with the common node between described 6th inductance and described 8th inductance, other end ground connection.
6. according to the arbitrary described microminiaturized double balanced mixer of claim 1-5, it is characterized in that, a described 3dB electric bridge, described 2nd 3dB electric bridge, described 3rd 3dB electric bridge, described 4th 3dB electric bridge are the 3dB electric bridge that structure is identical, and described 3dB electric bridge is made on a ceramic substrate by the trickle band thin-film technique of ultra micro.
7. microminiaturized double balanced mixer according to claim 6, is characterized in that, described ceramic substrate is the aluminum oxide ceramic substrate that thickness is not more than 0.5mm.
8. microminiaturized double balanced mixer according to claim 6, is characterized in that, described 3dB electric bridge is the 3dB Lange electric bridge that S type is bending.
9., according to the arbitrary described microminiaturized double balanced mixer of claim 1-5, it is characterized in that, described first mixer diode, the second mixer diode, the 3rd mixer diode, the 4th mixer diode are Schottky diode.
10. microminiaturized double balanced mixer according to claim 4, it is characterized in that, a described 3dB electric bridge, 2nd 3dB electric bridge, 3rd 3dB electric bridge, 4th 3dB electric bridge, first electric capacity, first inductance, second electric capacity, second inductance, 3rd electric capacity, 3rd inductance, 4th electric capacity, 4th inductance, 5th electric capacity, 5th inductance, 6th electric capacity, 6th inductance, 7th electric capacity, 7th inductance, 8th electric capacity, 8th inductance, first mixer diode, second mixer diode, 3rd mixer diode, connecting line between 4th mixer diode is all made on a ceramic substrate by the trickle band thin-film technique of ultra micro.
11. microminiaturized double balanced mixers according to claim 10, it is characterized in that, described 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, 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 mixer diode are all arranged between corresponding connecting line with surface patch technique.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104702218A (en) * | 2014-12-02 | 2015-06-10 | 庄昆杰 | Micro double balanced mixer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104702218A (en) * | 2014-12-02 | 2015-06-10 | 庄昆杰 | Micro double balanced mixer |
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