CN105281673A - Multi-band reconfigurable mixing method and mixer - Google Patents
Multi-band reconfigurable mixing method and mixer Download PDFInfo
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- CN105281673A CN105281673A CN201510720170.1A CN201510720170A CN105281673A CN 105281673 A CN105281673 A CN 105281673A CN 201510720170 A CN201510720170 A CN 201510720170A CN 105281673 A CN105281673 A CN 105281673A
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Abstract
The invention relates to a multi-band reconfigurable mixing method and a mixer. The leading performance index of a mixer is linearity; in order to decrease the burden of a front-stage low-noise amplifier, the mixer needs a certain frequency conversion gain and a low noise coefficient; and when the mixer works at a plurality of different bands in a reconfigurable manner, there are correspondingly requirements for in-band and inter-band gain flatness. According to the multi-band reconfigurable mixing method and the mixer of the invention, a switching frequency selection tunable network is additionally adopted based on a folded type mixer; externally-applied control voltage and variable elements are adjusted, so that a circuit can be optimal in performance when working under a plurality of different bands; a load inductor is connected in parallel with controlled variable capacitors, and therefore, the adjustment range of the band of the mixer can be extended; a continuously variable resistor (60) is adopted, and a resistor which is originally installed at a position where the continuously variable resistor (60) is installed is a switch device which controls and makes a resistor with a constant resistance value connected into or not connected into the circuit, so that the resistor and another other fixed resistor can form two kinds of resistance values, while, after the resistor is replaced by the continuously variable resistor (60), the number of components can be decreased, and the continuity of tuning can be increased.
Description
Technical field
The present invention relates to a kind of electronic devices and components and method of work thereof, being specifically related to a kind of being applied to makes frequency mixer can be operated in method and the multiband restructural frequency mixer thereof of multiple frequency range by the tunable network of switch frequency-selecting in multimode multi-frequency section wireless communication system, the method and multiband restructural frequency mixer utilize tunable load resistance, thus balance variable gain and noise factor as required, simultaneously also can optimized gain flatness, while realizing multiband work, multiband restructural frequency mixer of the present invention also has good noise factor, gain, the technical indicators such as input-output adapt ation, belong to wireless communication system technologies field.
background technology:
At present, diversified communication standard has been there is in the development of mobile communication, the wireless communication systems such as the such as third generation (3G) cell mobile communication systems, bluetooth (Bluetooth) and WLAN (wireless local area network) (WirelessLocalAreaNetworks, WLAN) all play vital effect in respective application.An important trend of Mobile Communication Development is that single communication terminal can compatible multiple communication standard, and has also had the typical case of relevant wireless communication system.Compatible multiple communication standard is as GSM(GlobalSystemforMobileCommunications), UMTS(UniversalMobileTelecommunicationsSystem), the communication terminal of bluetooth (Bluetooth) or wireless lan (wlan) etc., both can be used as mobile communication terminal, other wireless communication signals can be received and dispatched again.The communication system of compatible multiple communication standard has multi-frequency multi-channel and restructural characteristic.Thus the design of multifrequency reconfigurable device to become in mobile communication technology development a very crucial problem.
Being most widely used research in current mobile terminal transceiver also deep is double balanced mixer based on Gilbert unit, and this circuit structure comes from the high accuracy multiplier that BarrieGilbert proposes.Gilbert frequency mixer through good design has good isolation and noise suppressed performance, and therefore the frequency mixer of this structure has a lot of version improved, for optimizing a certain performance wherein especially.Following 3 kinds of topological structures are mainly divided in existing optimization version:
1. active load and current injection structures.This structure can effectively promote conversion gain and the linearity.
2. accordion structure.This structure reduces transistor stack, reduces operating voltage.
3. source negative feedback structure.This structure is sacrificed gain and increases the linearity.
Wherein, active load technology adopts the transistor working in linear zone to replace passive resistance; Most of transconductance stage electric current additional current source is shared by current injection, and no longer through switching tube.These two kinds of technology all maintaining under the constant prerequisite of transconductance stage gm value, can increase load resistance, thus improving conversion gain.But active load and current injection all can introduce new noise increases overall noise factor, and mixer linearity degree can be caused to a certain extent to worsen.
Accordion structure effectively can reduce transistor stack, makes low voltage operating become possibility.Additional folding structure also makes switching stage and loading section not affect by transconductance stage electric current, improves the service behaviour of switching tube, and can improve impedance thus raising gain in maximum magnitude.But accordion structure current sinking is almost the twice of traditional structure, power consumption increases.
Negative-feedback technology makes the correlation of reduction gm and frequency by adding resistance or inductor degeneration at transconductance stage source electrode, increase the linearity.But this technique reduces the mutual conductance of radio frequency input stage, mixer gain reduces.
And its design difficulty of the frequency mixer worked under multiband is larger, how enabling frequency mixer restructural work and reach Performance optimization on multiple different frequency range, will be a huge challenge.In existing solution, be mainly the frequency mixer in design broadband to cover all working frequency range.But in side circuit design, broadband mixer sacrifices other performances for cost, the such as linearity, noise factor, reach enough bandwidth of operation thus cover multiple working frequency range.And between different operating frequency range, broadband mixer performance index difference is comparatively large, brings huge difficulty to other device layout of reconfigurable system.
In order to address this problem, there has been proposed bandwidth expansion and flat gain technology.This technology to a certain degree in make gain more smooth in bandwidth of operation, but conversion gain is further reduced.In addition because adds additional 2 inductance elements, introduce extra noise, noise factor worsens.And circuit complexity increases, cost increases, and after reconstitution, adjustable range is very little for especially existing multiband mixer, and especially variable gain and noise factor balance is not that good problem can not get fine solution, therefore still needs to be improved further.
Do not find that there is the patent literature constructed with the present invention by retrieval, to have the patent of certain relation and paper to mainly contain following with the present invention:
1, the patent No. is CN200810301135, the patent of invention that name is called " the two gain mode down-conversion mixer of High Linear multiband ", which disclose a kind of conversion mixer by with the outer match circuit of suitable sheet can bypass low noise amplifier, the gilbert mixer of band emitter following buffer is connected and composed by AC coupled.The band-gap reference electric current that the biased employing of circuit is other and voltage module provide.Can the low noise amplifier of bypass adopt field effect transistor to be input stage, resistance does load, and the larger bias current of application is to obtain High Linear and stable gain and suitable noise factor.When this circuit by switching over to bypass mode time, it is equivalent to a passive network, no longer has amplification to signal but possesses the higher linearity.Frequency conversion function depends on gilbert mixer, and its input stage adopts field effect transistor, and adds source negative feedback, and switch sections adopts bipolarity pipe, to ensure High Linear and lower noise.Its load adopts resistance and electric capacity, still has constant gain, and filter unwanted high-frequency signal when ensureing frequency change.The emitter following buffer of intermediate-frequency section can reduce output impedance, and makes circuit unaffected with performance when module is connected below.
2, the patent No. is CN200480015037, name is called the patent of invention of " multiband mixer ", which disclose a kind of equipment for frequency inverted, comprise just what a multiband mixer, this multiband mixer has the device of a kind of signal for the signal input by being applied to described multiband mixer signal from the source frequency range linear transformation of described signal to multiple target frequency sub-band, and the signal of conversion is produced in the signal output of described multiband mixer, wherein said multiple target frequency sub-band defines at least first object frequency range and the second target frequency bands, and this equipment also comprises one group of switchable Variable Gain amplifier (VGA), for amplifying the signal of described conversion, wherein for each described target frequency bands, the changeable VGA that one is fitted to signal that is in described target frequency bands and that be connected to described multiband mixer and exports is provided.
3, the patent No. is CN201210544211, name is called the patent of invention of " a kind of reconfigurable passive mixer ", which disclose a kind of reconfigurable passive mixer, comprise transconductance stage, two balance cock level and across resistance level, input radio frequency signal is changed into radio-frequency current by transconductance stage, radio-frequency current realizes electric current down-conversion through two balance cock level, and the electric current after down-conversion exports by being converted to voltage of intermediate frequency across resistance level.Wherein the transconductance value of transconductance stage is controlled by a control word (VC), across being controlled by another one control word (VC1) across resistance of resistance level.Passive frequency mixer configures its 4 kinds of gain modes by these 2 control words (VC, VC1), and other performances such as noise factor, the linearity and power consumption also obtain corresponding configuration.
4, the patent No. is CN201010022737, name is called the patent of invention of " integrated circuit chip of dual frequency band reconfigurable frequency mixer ", which disclose a kind of restructural frequency mixer integrated circuit (IC) chip, particularly be applied to IMT-Advanced (AdvancedInternationalMobileCommunications, and ultra broadband (Ultra-WideBand IMT-Advanced), a kind of integrated circuit chip of dual frequency band reconfigurable frequency mixer of the two kinds of systems that UWB) communicate, employing tunable capacitor and resistor network structure realize the restructural between two frequency ranges, compared with other mixer architectures reported at present, described circuit adds switch frequency-selecting tuning network, by regulating additional control voltage, circuit is switched between two kinds of mode of operations.Meanwhile, by regulating the component parameters in described circuit, make circuit reach Performance optimization in two frequency ranges simultaneously.
Although these patents above-mentioned and paper all relate to multiband restructural frequency mixer, it is also proposed some technical improvement, all do not have proposition how little for multiband restructural frequency mixer adjustable extent, variable gain and noise factor balance bad improvement; Therefore, while realizing multiband work, the technical indicator such as noise factor, gain, input-output adapt ation of multiband restructural frequency mixer is still undesirable, so still need to be improved further.
Summary of the invention
The object of the invention is to, for the deficiency existing for existing multiband restructural frequency mixing method and frequency mixer, propose a kind of new multiband restructural frequency mixing method and frequency mixer, realize switching in the frequency range that multiple bandwidth is different.This multiband restructural frequency mixing method and frequency mixer are compared with the broadband mixer of original multiband, considering the linearity, variable gain flatness, there is the raising of larger improvement the aspect such as complexity and power consumption, can make mixer linearity degree, the indexs such as gain noise coefficient reach optimum in two frequency ranges simultaneously.
In order to reach this purpose, the invention provides a kind of multiband restructural frequency mixing method, according to frequency mixer position in receivers, the topmost performance index of frequency mixer are the linearity, need certain conversion gain and good noise factor to reduce the pressure of prime low noise amplifier simultaneously, and restructural is when working in multiple different frequency range, also there is the corresponding principle required to the gain flatness in its frequency band and between frequency band; On the basis of collapsible frequency mixer, add the tunable network of switch frequency-selecting, by regulating additional control voltage and regulating variable element, make circuit working reach Performance optimization at multiband simultaneously.
Further, the described tunable network of switch frequency-selecting that adds is in frequency mixer, add tunable capacitor network, by tunable capacitor being accessed from mixer or disconnecting, circuit is switched between multiple frequency range, simultaneously by regulating adjustable element, particularly on load inductance, be incorporated with tunable capacitor device, by control capacittance and then regulate its resonance frequency, realize the fine setting of performance in frequency range.
Further, described tunable capacitor network comprises inductance
l 1 with
l 2 with electric capacity
c 1 ,
c 2 ,
c 5 ,
c 6 , variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 and as switching tube
pM 1 with
pM 2 form switch frequency-selecting regulating networks together; Wherein, electric capacity
c 1 , switching tube
pM 1 drain electrode source class, electric capacity
c 5 inductance is connected in parallel on successively after series connection
l 1 two ends; Variable capacitance
vC 5 be connected in parallel on inductance
l 1 two ends, variable capacitance
vC 1 , VC 2 inductance is connected in parallel on after series connection
l 1 two ends; Symmetrical, electric capacity
c 2 , switching tube
pM 2 drain electrode source class, electric capacity
c 6 inductance is connected in parallel on successively after series connection
l 2 two ends; Variable capacitance
vC 6 be connected in parallel on inductance
l 2 two ends, variable capacitance
vC 3 , VC 4 inductance is connected in parallel on after series connection
l 2 two ends; Control voltage
v b1 control switch pipe
pM 1 with
pM 2 break-make, and then control capacitance
c 1 ,
c 2 ,
c 5 ,
c 6 , whether accesses or break from mixer, thus control frequency mixer switches between relatively high and lower frequency range; Inductance
l 1 with
l 2 with variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 form the tunable network of switch frequency-selecting together, regulate resonance point by capacitance value, thus realize fine setting in frequency band.
Further, described utilizes adjustable resistance as load by regulating additional control voltage and regulating variable element to comprise, thus balances variable gain and noise factor as required, optimized gain flatness simultaneously.
Further, the described adjustable resistance that utilizes is at medium frequency output end mouth as load
v if and adjustable resistance is set between ground connection as load, is directly undertaken tuning by continuous variable resistance, add tuning continuity.
A kind of frequency mixer realizing above-mentioned multiband restructural frequency mixing method, for collapsible frequency mixer, comprise the tunable network of switch frequency-selecting at frequency mixer, and by regulating additional control voltage and regulating variable element, make circuit working reach Performance optimization at multiband simultaneously.
Further, the described tunable network of switch frequency-selecting comprises inductance
l 1 with
l 2 with electric capacity
c 1 ,
c 2 ,
c 5 ,
c 6 , variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 and as switching tube
pM 1 with
pM 2 , by inductance
l 1 with
l 2 with electric capacity
c 1 ,
c 2 ,
c 5 ,
c 6 , variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 and as switching tube
pM 1 with
pM 2 form switch frequency-selecting regulating networks together; Wherein, electric capacity
c 1 , switching tube
pM 1 drain electrode source class, electric capacity
c 5 inductance is connected in parallel on successively after series connection
l 1 two ends; Variable capacitance
vC 5 be connected in parallel on inductance
l 1 two ends, variable capacitance
vC 1 , VC 2 inductance is connected in parallel on after series connection
l 1 two ends; Symmetrical, electric capacity
c 2 , switching tube
pM 2 drain electrode source class, electric capacity
c 6 inductance is connected in parallel on successively after series connection
l 2 two ends; Variable capacitance
vC 6 be connected in parallel on inductance
l 2 two ends, variable capacitance
vC 3 , VC 4 inductance is connected in parallel on after series connection
l 2 two ends; Control voltage
v b1 control switch pipe
pM 1 with
pM 2 break-make, and then control capacitance
c 1 ,
c 2 ,
c 5 ,
c 6 , whether accesses or break from mixer, thus control frequency mixer switches between relatively high and lower frequency range; Inductance
l 1 with
l 2 with variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 form the tunable network of switch frequency-selecting together, regulate resonance point by capacitance value, thus realize fine setting in frequency band.
Further, described
v b1 for frequency-selecting voltage,
v b1 control frequency mixer to switch between two relatively high and lower frequency ranges.
Further, described variable element comprises using adjustable resistance as load, and adjustable resistance balances variable gain and noise factor regulating load as required, simultaneously optimized gain flatness.
Further, described adjustable resistance is at medium frequency output end mouth as load
v if and adjustable resistance is set between ground connection as load, is directly undertaken tuning by continuous variable resistance, add tuning continuity.
The invention has the advantages that,
Multiband restructural frequency mixing method of the present invention and frequency mixer propose on the basis of collapsible frequency mixer, add the tunable network of switch frequency-selecting, by regulating additional control voltage and regulating variable element, make circuit working reach Performance optimization at multiband simultaneously.There is following characteristics:
1, controlled variable capacitance in parallel on load inductance, adds the adjustable range of frequency mixer frequency range.
2, continuous variable resistance (60), the originally resistance of this position, is that a switching device controls a fixed resistance value resistance whether place in circuit, forms two kinds of resistances with another fixed resistance.After changing continuously adjustabe resistance into, decrease number of elements, add tuning continuity.
Compared with the broadband mixer of original multiband, considering the linearity, variable gain flatness, there is the raising of larger improvement the aspect such as complexity and power consumption, can make mixer linearity degree, the indexs such as gain noise coefficient reach optimum in two frequency ranges simultaneously.
Accompanying drawing explanation
Fig. 1 is the complete topology figure of the design's circuit;
The conversion gain of Fig. 2 frequency mixer on two working frequency range;
The noise factor of Fig. 3 frequency mixer on two working frequency range;
The 1dB compression point of Fig. 4 frequency mixer on 3.4-3.6GHz working frequency range;
The 3 rank intermodulation points of Fig. 5 frequency mixer on 3.4-3.6GHz working frequency range;
The 1dB compression point of Fig. 6 frequency mixer on 4.2-4.8GHz working frequency range;
The 3 rank intermodulation points of Fig. 7 frequency mixer on 4.2-4.8GHz working frequency range.
In Fig. 1:
10 – transistors
nM 1
11 – transistors
nM 2
12 – transistors
nM 3
13 – transistors
nM 4
20 – transistors
pM 1
21 – transistors
pM 2
22 – transistors
pM 3
23 – transistors
pM 4
24 – transistors
pM 5
25 – transistors
pM 6
30 – variable capacitances
vC 1
31 – variable capacitances
vC 2
32 – variable capacitances
vC 3
33 – variable capacitances
vC 4
34 – variable capacitances
vC 5
35 – variable capacitances
vC 6
40 – inductance
l 1
41 – inductance
l 2
50 – electric capacity
c 1
51 – electric capacity
c 2
52 – electric capacity
c 3
53 – electric capacity
c 4
54 – electric capacity
c 5
55 – electric capacity
c 6
60 – variable resistors
r 1
63 – variable resistors
r 4
64 – resistance
r 5
65 – resistance
r 6
66 – resistance
r 7
67 – resistance
r 8
70 – supply voltages
v dD
71 – ground
gND
72 – control voltages
v b1
74,75,76 – bias voltages
80,81 – rf inputs mouths
± V rf
82,83 – local oscillator input port
± V lo
84,85 – medium frequency output end mouths
± V if .
Embodiment
The present invention is set forth further below in conjunction with the drawings and specific embodiments.
Embodiment one
Can be found out by accompanying drawing 1, the present invention relates to a kind of frequency mixer realizing above-mentioned multiband restructural frequency mixing method, for collapsible frequency mixer, the tunable network of switch frequency-selecting is comprised at frequency mixer, and by regulating additional control voltage and regulating variable element, make circuit working reach Performance optimization at multiband simultaneously.
The described tunable network of switch frequency-selecting comprises inductance
l 1 with
l 2 with electric capacity
c 1 ,
c 2 ,
c 5 ,
c 6 , variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 and as switching tube
pM 1 with
pM 2 , by inductance
l 1 with
l 2 with electric capacity
c 1 ,
c 2 ,
c 5 ,
c 6 , variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 and as switching tube
pM 1 with
pM 2 form switch frequency-selecting regulating networks together; Wherein, electric capacity
c 1 , switching tube
pM 1 drain electrode source class, electric capacity
c 5 inductance is connected in parallel on successively after series connection
l 1 two ends; Variable capacitance
vC 5 be connected in parallel on inductance
l 1 two ends, variable capacitance
vC 1 , VC 2 inductance is connected in parallel on after series connection
l 1 two ends; Symmetrical, electric capacity
c 2 , switching tube
pM 2 drain electrode source class, electric capacity
c 6 inductance is connected in parallel on successively after series connection
l 2 two ends; Variable capacitance
vC 6 be connected in parallel on inductance
l 2 two ends, variable capacitance
vC 3 , VC 4 inductance is connected in parallel on after series connection
l 2 two ends; Control voltage
v b1 control switch pipe
pM 1 with
pM 2 break-make, and then control capacitance
c 1 ,
c 2 ,
c 5 ,
c 6 , whether accesses or break from mixer, thus control frequency mixer switches between relatively high and lower frequency range; Inductance
l 1 with
l 2 with variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 form the tunable network of switch frequency-selecting together, regulate resonance point by capacitance value, thus realize fine setting in frequency band.
Described
v b1 for frequency-selecting voltage,
v b1 control frequency mixer to switch between two relatively high and lower frequency ranges.
Described variable element comprises using adjustable resistance as load, and adjustable resistance balances variable gain and noise factor regulating load as required, simultaneously optimized gain flatness.
Described adjustable resistance is at medium frequency output end mouth as load
v if and adjustable resistance is set between ground connection as load, is directly undertaken tuning by continuous variable resistance, add tuning continuity.
Described frequency mixer is also provided with transistor
nM 1 with
nM 2 , transistor
nM 1 with
nM 2 for current source, two transistor gates are connected, and provide biased by external voltage.Transistor
nM 3 with
nM 4 form frequency mixer transconductance stage, radio-frequency input signals grid source is respectively by capacitance C
4, C
3be connected to transistor
nM 3 with
nM 4 grid.Resistance R5, R6 connect power supply and transistor respectively
nM 3 with
nM 4 grid, be transistor
nM 3 with
nM 4 bias voltage is provided.Transistor
nM 3 with
nM 4 drain electrode connect inductance respectively
l 1 with
l 2 .
Described is also provided with transistor
pM 3 ,
pM 4 ,
pM 5 with
pM 6 , transistor
pM 3 ,
pM 4 ,
pM 5 with
pM 6 form mixer switches level.Transistor
pM 3 ,
pM 4 source class be connected, and and transistor
nM 3 drain electrode is connected, transistor
pM 5 with
pM 6 source class be connected, and and transistor
nM 4 drain electrode is connected.External voltage is contact resistance R successively
7and transistor
pM 3 with
pM 6 grid, be transistor
pM 3 with
pM 6 bias voltage is provided.Symmetrical, external voltage is contact resistance R successively
8and transistor
pM 4 with
pM 5 grid, be transistor
pM 4 with
pM 5 bias voltage is provided.Transistor
pM 3 with
pM 6 grid, and transistor
pM 4 with
pM 5 grid connect the positive and negative terminal of local oscillator input signals respectively.Transistor
pM 3 with
pM 5 drain electrode, and transistor
pM 4 with
pM 6 drain electrode connect the positive and negative terminal of IF output signal respectively.Transistor
pM 3 with
pM 5 drain electrode connect variable resistor R
1ground connection again, transistor
pM 4 with
pM 6 drain electrode connect variable resistor R
4ground connection again.When different frequency range by adjusting resistance value, make total load resistance change, optimize the linearity and gain flatness.
Above-mentioned listed embodiment, just carries out clear, complete description to technical scheme of the present invention by reference to the accompanying drawings; Obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Can be found out by above-described embodiment, the invention still further relates to a kind of multiband restructural frequency mixing method, according to frequency mixer position in receivers, the topmost performance index of frequency mixer are the linearity, need certain conversion gain and good noise factor to reduce the pressure of prime low noise amplifier simultaneously, and restructural is when working in multiple different frequency range, also there is the corresponding principle required to the gain flatness in its frequency band and between frequency band; On the basis of collapsible frequency mixer, add the tunable network of switch frequency-selecting, by regulating additional control voltage and regulating variable element, make circuit working reach Performance optimization at multiband simultaneously.
Further, the described tunable network of switch frequency-selecting that adds is in frequency mixer, add tunable capacitor network, by tunable capacitor being accessed from mixer or disconnecting, circuit is switched between multiple frequency range, simultaneously by regulating adjustable element, particularly on load inductance, be incorporated with tunable capacitor device, by control capacittance and then regulate its resonance frequency, realize the fine setting of performance in frequency range.
Further, described tunable capacitor network comprises inductance
l 1 with
l 2 with electric capacity
c 1 ,
c 2 ,
c 5 ,
c 6 , variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 and as switching tube
pM 1 with
pM 2 form switch frequency-selecting regulating networks together; Wherein, electric capacity
c 1 , switching tube
pM 1 drain electrode source class, electric capacity
c 5 inductance is connected in parallel on successively after series connection
l 1 two ends; Variable capacitance
vC 5 be connected in parallel on inductance
l 1 two ends, variable capacitance
vC 1 , VC 2 inductance is connected in parallel on after series connection
l 1 two ends; Symmetrical, electric capacity
c 2 , switching tube
pM 2 drain electrode source class, electric capacity
c 6 inductance is connected in parallel on successively after series connection
l 2 two ends; Variable capacitance
vC 6 be connected in parallel on inductance
l 2 two ends, variable capacitance
vC 3 , VC 4 inductance is connected in parallel on after series connection
l 2 two ends; Control voltage
v b1 control switch pipe
pM 1 with
pM 2 break-make, and then control capacitance
c 1 ,
c 2 ,
c 5 ,
c 6 , whether accesses or break from mixer, thus control frequency mixer switches between relatively high and lower frequency range; Inductance
l 1 with
l 2 with variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 form the tunable network of switch frequency-selecting together, regulate resonance point by capacitance value, thus realize fine setting in frequency band.
Further, described utilizes adjustable resistance as load by regulating additional control voltage and regulating variable element to comprise, thus balances variable gain and noise factor as required, optimized gain flatness simultaneously.
Further, the described adjustable resistance that utilizes is at medium frequency output end mouth as load
v if and adjustable resistance is set between ground connection as load, is directly undertaken tuning by continuous variable resistance, add tuning continuity.
The invention has the advantages that:
Multiband restructural frequency mixing method of the present invention and frequency mixer propose on the basis of collapsible frequency mixer, add the tunable network of switch frequency-selecting, by regulating additional control voltage and regulating variable element, make circuit working reach Performance optimization at multiband simultaneously.There is following characteristics:
1, controlled variable capacitance in parallel on load inductance, adds the adjustable range of frequency mixer frequency range.
2, continuous variable resistance (60), the originally resistance of this position, is that a switching device controls a fixed resistance value resistance whether place in circuit, forms two kinds of resistances with another fixed resistance.After changing continuously adjustabe resistance into, decrease number of elements, add tuning continuity.
Compared with the broadband mixer of original multiband, considering the linearity, variable gain flatness, there is the raising of larger improvement the aspect such as complexity and power consumption, can make mixer linearity degree, the indexs such as gain noise coefficient reach optimum in two frequency ranges simultaneously.
In order to prove the feasibility of circuit of the present invention, we utilize emulation tool Cadence-SpectreRF to emulate.
Circuit voltage is 1.2V, and core circuit power consumption is less than 9mW, and whole circuit power consumption is less than 15mW.
Conversion gain is as shown in Figure 2 in two frequency ranges for the emulation of circuit; Noise factor is as shown in Figure 3 in two frequency ranges for the emulation of circuit; The emulation of circuit in 3.4-3.6GHz frequency range 1dB compression point and 3 rank intermodulation points respectively as shown in Fig. 4, Fig. 5; Circuit simulation in 4.2-4.8GHz frequency range 1dB compression point and 3 rank intermodulation points as shown in Fig. 6, Fig. 7.
In 3.4-3.6GHz frequency range, 1dB compression point is-3.9dB, and 3 rank intermodulation points are 5.13dB.Conversion gain is 6.86-6.88(dB), passband fluctuation is less than 0.05dB, and noise factor is less than 15dB.
In 4.2-4.8GHz frequency range, 1dB compression point is-4.78dB, and 3 rank intermodulation points are 3.79dB.Conversion gain is 6.53-6.97(dB), passband fluctuation is less than 0.5dB, and noise factor is less than 13dB.
The result delivered with other is compared, and capabilities list of the present invention is as follows.
Table 1 and the Performance comparision delivering frequency mixer
By comparing with comparative example, we find that the performance novelty of multiband mixer structure of the present invention is as follows: the design is switched between 3.4-3.6GHz and 4.2-4.8GHz two frequency range by control voltage, avoid unnecessary frequency range, reduce actual bandwidth of operation, design difficulty reduces.And two different frequency ranges can be optimized respectively, compared with comparative example, avoid broadband mixer bandwidth excessive to designing all adverse effects brought.Compared with comparative example 1, the design's gain flatness obviously improves, and the linearity also has a distinct increment.Owing to adding extra electric capacity and switching tube, noise factor aspect slightly declines, but operating voltage and power consumption are close, not other extra expenses.Compared with comparative example 2, the design's conversion gain is slightly high, and gain flatness is similar to, and has obvious advantage in power consumption and noise factor.
Claims (10)
1. a multiband restructural frequency mixing method, according to frequency mixer position in receivers, the topmost performance index of frequency mixer are the linearity, need certain conversion gain and good noise factor to reduce the pressure of prime low noise amplifier simultaneously, and restructural is when working in multiple different frequency range, also there is the corresponding principle required to the gain flatness in its frequency band and between frequency band; It is characterized in that: on the basis of collapsible frequency mixer, add the tunable network of switch frequency-selecting, by regulating additional control voltage and regulating variable element, make circuit working reach Performance optimization at multiband simultaneously.
2. multiband restructural frequency mixing method as claimed in claim 1, it is characterized in that: the described tunable network of switch frequency-selecting that adds is in frequency mixer, add tunable capacitor network, by tunable capacitor being accessed from mixer or disconnecting, circuit is switched between multiple frequency range, simultaneously by regulating adjustable element, particularly on load inductance, be incorporated with tunable capacitor device, by control capacittance and then regulate its resonance frequency, realize the fine setting of performance in frequency range.
3. multiband restructural frequency mixing method as claimed in claim 2, is characterized in that: described tunable capacitor network comprises inductance
l 1 with
l 2 with electric capacity
c 1 ,
c 2 ,
c 5 ,
c 6 , variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 and as switching tube
pM 1 with
pM 2 form switch frequency-selecting regulating networks together; Wherein, electric capacity
c 1 , switching tube
pM 1 drain electrode source class, electric capacity
c 5 inductance is connected in parallel on successively after series connection
l 1 two ends; Variable capacitance
vC 5 be connected in parallel on inductance
l 1 two ends, variable capacitance
vC 1 , VC 2 inductance is connected in parallel on after series connection
l 1 two ends; Symmetrical, electric capacity
c 2 , switching tube
pM 2 drain electrode source class, electric capacity
c 6 inductance is connected in parallel on successively after series connection
l 2 two ends; Variable capacitance
vC 6 be connected in parallel on inductance
l 2 two ends, variable capacitance
vC 3 , VC 4 inductance is connected in parallel on after series connection
l 2 two ends; Control voltage
v b1 control switch pipe
pM 1 with
pM 2 break-make, and then control capacitance
c 1 ,
c 2 ,
c 5 ,
c 6 , whether accesses or break from mixer, thus control frequency mixer switches between relatively high and lower frequency range; Inductance
l 1 with
l 2 with variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 form the tunable network of switch frequency-selecting together, regulate resonance point by capacitance value, thus realize fine setting in frequency band.
4. multiband restructural frequency mixing method as claimed in claim 1, it is characterized in that: described utilizes adjustable resistance as load by regulating additional control voltage and regulating variable element to comprise, thus balance variable gain and noise factor as required, optimized gain flatness simultaneously.
5. multiband restructural frequency mixing method as claimed in claim 4, is characterized in that: the described adjustable resistance that utilizes is at medium frequency output end mouth as load
v if and adjustable resistance is set between ground connection as load, is directly undertaken tuning by continuous variable resistance, add tuning continuity.
6. one kind realizes the frequency mixer of multiband restructural frequency mixing method described in claim 1, for collapsible frequency mixer, comprise the tunable network of switch frequency-selecting at frequency mixer, and by regulating additional control voltage and regulating variable element, make circuit working reach Performance optimization at multiband simultaneously.
7. frequency mixer as claimed in claim 6, is characterized in that: the described tunable network of switch frequency-selecting comprises inductance
l 1 with
l 2 with electric capacity
c 1 ,
c 2 ,
c 5 ,
c 6 , variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 and as switching tube
pM 1 with
pM 2 , by inductance
l 1 with
l 2 with electric capacity
c 1 ,
c 2 ,
c 5 ,
c 6 , variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 and as switching tube
pM 1 with
pM 2 form switch frequency-selecting regulating networks together; Wherein, electric capacity
c 1 , switching tube
pM 1 drain electrode source class, electric capacity
c 5 inductance is connected in parallel on successively after series connection
l 1 two ends; Variable capacitance
vC 5 be connected in parallel on inductance
l 1 two ends, variable capacitance
vC 1 , VC 2 inductance is connected in parallel on after series connection
l 1 two ends; Symmetrical, electric capacity
c 2 , switching tube
pM 2 drain electrode source class, electric capacity
c 6 inductance is connected in parallel on successively after series connection
l 2 two ends; Variable capacitance
vC 6 be connected in parallel on inductance
l 2 two ends, variable capacitance
vC 3 , VC 4 inductance is connected in parallel on after series connection
l 2 two ends; Control voltage
v b1 control switch pipe
pM 1 with
pM 2 break-make, and then control capacitance
c 1 ,
c 2 ,
c 5 ,
c 6 , whether accesses or break from mixer, thus control frequency mixer switches between relatively high and lower frequency range; Inductance
l 1 with
l 2 with variable capacitance
vC 1 , VC 2 , VC 3 , VC 4 , VC 5 and VC 6 form the tunable network of switch frequency-selecting together, regulate resonance point by capacitance value, thus realize fine setting in frequency band.
8. frequency mixer as claimed in claim 7, is characterized in that: described
v b1 for frequency-selecting voltage,
v b1 control frequency mixer to switch between two relatively high and lower frequency ranges.
9. frequency mixer as claimed in claim 6, it is characterized in that: described variable element comprises using adjustable resistance as load, adjustable resistance balances variable gain and noise factor regulating load as required, simultaneously optimized gain flatness.
10. frequency mixer as claimed in claim 9, is characterized in that: described adjustable resistance is at medium frequency output end mouth as load
v if and adjustable resistance is set between ground connection as load, is directly undertaken tuning by continuous variable resistance, add tuning continuity.
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| CN201510720170.1A CN105281673A (en) | 2015-10-30 | 2015-10-30 | Multi-band reconfigurable mixing method and mixer |
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| CN201510720170.1A CN105281673A (en) | 2015-10-30 | 2015-10-30 | Multi-band reconfigurable mixing method and mixer |
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| CN109309480A (en) * | 2018-10-29 | 2019-02-05 | 电子科技大学 | A kind of low noise switched transconductor mixer |
| CN109714005A (en) * | 2018-12-25 | 2019-05-03 | 电子科技大学 | A kind of restructural double frequency-band frequency mixer |
| WO2019223541A1 (en) * | 2018-05-24 | 2019-11-28 | 清华大学深圳研究生院 | Power mixer circuit |
| CN114124039A (en) * | 2022-01-28 | 2022-03-01 | 微龛(广州)半导体有限公司 | Frequency peak tuning circuit and system |
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| CN102130654A (en) * | 2010-01-12 | 2011-07-20 | 东南大学 | Integrated circuit chip of dual frequency band reconfigurable frequency mixer |
| CN102130656A (en) * | 2010-01-12 | 2011-07-20 | 东南大学 | Novel integrated circuit structure of full-integrated dual frequency band low-noise amplifier |
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| US20110140746A1 (en) * | 2009-12-15 | 2011-06-16 | Electronics And Telecommunications Research Institute | Dual-band wideband local oscillation signal generator |
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Application publication date: 20160127 |