CN104767489A - Active mixer and active frequency mixing method - Google Patents
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- CN104767489A CN104767489A CN201410008130.XA CN201410008130A CN104767489A CN 104767489 A CN104767489 A CN 104767489A CN 201410008130 A CN201410008130 A CN 201410008130A CN 104767489 A CN104767489 A CN 104767489A
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Abstract
The invention discloses an active mixer and an active frequency mixing method. The active mixer comprises a voltage to current conversion circuit, a switching circuit, a load circuit, a first supplementary current source and a second supplementary current source, wherein the voltage to current conversion circuit generates a conversion signal according to an input signal; the switching circuit is coupled to the voltage to current conversion circuit and executes switching on/off according to a clock pulse signal, and the voltage to current conversion circuit is electrically connected with the load circuit by switching on/off; the load circuit is coupled to the switching circuit, and an output signal is provided to a first output node and a second output according to the conversion signal by switching on/off of the switching circuit; the first supplementary current source is coupled to a first node between the switching circuit and the first output node to provide a first supplementary current to the switching circuit; and the second supplementary current source is coupled to a second node between the switching circuit and the second output node to provide a second supplementary current to the switching circuit.
Description
Technical field
The invention relates to frequency mixer and frequency mixing method, especially about active mixer and active frequency mixing method.
Background technology
Frequency mixer is used to the frequency of conversion one input signal, mainly by switching circuit, input signal is multiplied with switch signal and realizes.The input of one frequency mixer comprises a radio-frequency (RF) signal and a local oscillations signal, and exporting is then, according to this local oscillations signal, this radio-frequency (RF) signal is carried out the intermediate frequency signal after shift frequency.Typically, frequency mixer can be applied to the raising frequency circuit of a transfer system or the frequency down circuit of a receiving system, and can divide into passive type frequency mixer and active mixer.Compared to active mixer, although the linearity of passive type frequency mixer is better, but it cannot provide conversion gain, therefore for adopting the system of passive type frequency mixer, front stage circuits must provide larger gain to carry out the noise of oppressive late-class circuit generation, in addition, the oscillation signal of passive type frequency mixer and the isolation of radio-frequency (RF) signal poor, easily cause the problem of oscillation signal radiation.As for active mixer, it is when electric crystal operates in saturation area (Saturation Region), radio-frequency voltage is converted to electric current, and utilize switching circuit according to the mode of switch signal output current to carry out frequency inverted, then the output current of switching circuit produces output voltage via output loading again, and therefore active mixer has a conversion gain.Compared to passive type frequency mixer, the conversion gain of active mixer can provide good noise inhibiting ability, but the framework of active mixer must in the voltage extent of supply by voltage distribution to voltage-to-current conversion circuit, switching circuit and load circuit, simultaneously for each circuit retains the suitable signal amplitude of oscillation for normal operation, therefore design enough and to spare less, the linearity is poor.Furthermore, active mixer often need at noise, make trade-offs between the linearity and conversion gain, for a double-balance active mixer device (being also called Gilbert Cell), by reduce flow through electric crystal for receiving local oscillations signal (rear claim switch electric crystal) although electric current can reduce flicker noise (Flicker Noise), but the equiva lent impedance that the electric crystal (rear title inputs electric crystal) that this measure can increase received RF signal is seen toward this switch electric crystal direction, make input electric crystal when receiving larger radio-frequency (RF) signal, easily enter triode region (TriodeRegion) by saturation area, and have influence on the linearity of frequency mixer, in addition, although can improve gain by the load impedance increasing intermediate frequency signal output, this measure can reduce the electric current flowing through switch electric crystal equally, and then affects the linearity of frequency mixer, moreover, along with the evolution of manufacture of semiconductor, after micro, the input operating range of electric crystal diminishes, if now preferentially guarantee, switch electric crystal is operated in saturation area (that is preferentially guaranteeing the linearity) with input electric crystal, the signal amplitude of oscillation of intermediate frequency signal output will be sacrificed (that is gain will be sacrificed), and be unfavorable for follow-up signal process, if but preferentially guarantee the signal amplitude of oscillation of output, the probability that then switch electric crystal and the service area of input electric crystal enter triode region by saturation area will improve, and then cause the loss of mixer linearity degree.For above-mentioned low operating voltage the problem that derives, although there is part prior art to adopt Source degeneration design to improve those problems, the problem that Source degeneration design can cause gain to diminish or circuit area increases, can make designer face awkward equally.
Related art can consult the United States Patent (USP) corresponding to U.S. Patent application that publication number is 20090029668 and following patent number: 5548840; 6078802; 6639447; 7816970; 7948294.
Summary of the invention
In view of the disappearance of prior art, an object of the present invention is to provide a kind of active mixer and frequency mixing method, to solve the problem of prior art.
The invention discloses a kind of active mixer, the linearity can be improved when taking into account gain and noise suppressed.One embodiment of this active mixer comprises: a voltage-to-current conversion circuit, a switching circuit, a load circuit, one first supplemental current source and one second supplemental current source; Wherein, this voltage-to-current conversion circuit is used for producing a transferring signals according to an input signal; This switching circuit couples this voltage-to-current conversion circuit, is used for performing switch motion according to a clock pulse signal, and is electrically connected this voltage-to-current conversion circuit and this load circuit via this switch motion; This load circuit couples this switching circuit, and being used for provides an output signal in one first output node and one second output node via the switch motion of this switching circuit according to this transferring signals; This first supplemental current source couples the first node between this switching circuit and this first output node, is used to provide one first supplemental current and gives this switching circuit; And this second supplemental current source couples the Section Point between this switching circuit and this second output node, be used to provide one second supplemental current and give this switching circuit.
Also disclosed is a kind of active frequency mixing method, can take into account gain, noise suppressed and the linearity, is performed by the active mixer comprising a voltage-to-current conversion circuit, a switching circuit and a load circuit.One embodiment of this active frequency mixing method comprises: utilize a voltage-to-current conversion circuit to produce a transferring signals according to an input signal; Utilize a switching circuit to perform switch motion according to a clock pulse signal, and be electrically connected this voltage-to-current conversion circuit and a load circuit via this switch motion; One first output node of an output signal between this switching circuit and this load circuit and one second output node is provided according to this transferring signals via this switch motion, there is provided one first supplemental current to give this switching circuit via a first node, wherein this first node is between this first output node and this switching circuit; And provide one second supplemental current to give this switching circuit via a Section Point, wherein this Section Point is between this second output node and this switching circuit.
Feature for the present invention, implementation and effect, hereby coordinate accompanying drawing to be described in detail as follows do preferred embodiment.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of active mixer of the present invention;
Fig. 2 is the schematic diagram that one of the active mixer of Fig. 1 implements pattern; And
Fig. 3 is the schematic diagram of an embodiment of active frequency mixing method of the present invention.
Wherein, description of reference numerals is as follows:
100 active mixers
110 voltage-to-current conversion circuits
120 switching circuits
130 load circuits
140 first supplemental current sources
150 second supplemental current sources
200 active mixers
210 voltage-to-current conversion circuits
212 first differential electric crystals pair
214 first current sources
220 switching circuits
222 second differential electric crystals pair
224 the 3rd differential electric crystals pair
226 second current sources
228 the 3rd current sources
O1, O2, N1, N2 node
C1, C2 transferring signals
Vop, Von output signal
Vip, Vin input signal
Lop, Lon clock pulse signal
IS1, IS2 supplemental current
M1, M2, M3, M4, M5, M6 electric crystal
I1, I2, I3, IL1, IL2 electric current
VDD operating voltage
V1 first voltage
V2 second voltage
R1, R2 resistance
S310 utilizes a voltage-to-current conversion circuit to produce a transferring signals according to an input signal
S320 utilizes a switching circuit to perform switch motion according to a clock pulse signal, and is electrically connected this voltage-to-current conversion circuit and a load circuit via this switch motion
S330 provides one first output node of an output signal between this switching circuit and this load circuit and one second output node via this switch motion according to this transferring signals
S340 provides one first supplemental current to give this switching circuit via a first node, and wherein this first node is between this first output node and this switching circuit
S350 provides one second supplemental current to give this switching circuit via a Section Point, and wherein this Section Point is between this second output node and this switching circuit
Embodiment
The technology idiom being reference the art of following description, as this specification is illustrated part term or defines, the explanation of this part term is as the criterion with the explanation of this specification or definition.
Disclosure of the present invention comprises active mixer and active frequency mixing method, can improve the linearity when taking into account gain and noise suppressed.This device and method can be applicable to an integrated circuit (such as a communication IC) or a system and device (such as one fixed or portable communication device), and be embodied as under possible prerequisite, the art those of ordinary skill can select the element of equivalence or step to realize the present invention according to the disclosure of the specification, that is enforcement of the present invention be not limited to after the embodiment chatted.The subelement comprised due to active mixer of the present invention may be separately well known elements, therefore under the prerequisite not affecting the fully open of this device invention and exploitativeness, below illustrates that the details for well known elements will give memorandum.In addition, active frequency mixing method of the present invention can perform by frequency mixer of the present invention or its equivalent device, and under the prerequisite not affecting the fully open of the method invention and exploitativeness, the explanation of following methods invention will focus on step content but not hardware.
Refer to Fig. 1, it is the schematic diagram of an embodiment of active mixer of the present invention, and as shown in Figure 1, the active mixer 100 of the present embodiment comprises: a voltage-to-current conversion circuit 110; One switching circuit 120; One load circuit 130; One first supplemental current source 140 and one second supplemental current source 150.Described voltage-to-current conversion circuit 110 is such as a transduction amplifier, is used for producing a transferring signals according to an input signal.Described switching circuit 120 couples voltage-to-current conversion circuit 110, be used for performing switch motion according to a clock pulse signal (equal or stem from an oscillation signal), and be electrically connected voltage-to-current conversion circuit 110 and load circuit 130 via this switch motion.Described load circuit 130 couples switching circuit 120, and being used for provides an output signal in one first output node O1 and one second output node O2 via the transferring signals of the switch motion foundation voltage-to-current conversion circuit 110 of switching circuit 120.Described first supplemental current source 140 couples the first node N1 between switching circuit 120 and the first output node O1, be used to provide one first supplemental current IS1 and give switching circuit 120, by this when the impedance of load circuit 130 does not reduce (that is constant or raising), guarantee the magnitude of current flowing through switching circuit 120, to improve the linearity.Similarly, described second supplemental current source 150 couples the Section Point N2 between switching circuit 120 and the second output node O2, be used to provide one second supplemental current IS2 and give switching circuit 120, under the nondecreasing situation of the impedance of load circuit 130, the linearity can be improved equally.
Refer to Fig. 2, it is the schematic diagram that one of the active mixer 100 of Fig. 1 implements pattern, in this enforcement pattern, active mixer 200 is the frameworks stemming from a double-balance active mixer device, and as the use of frequency demultiplier, therefore aforementioned input signal in this case radio-frequency (RF) signal, output signal is then intermediate frequency signal, so this implements pattern is only citing, the art those of ordinary skill can select known mixer framework to implement the change-over circuit 110 of Fig. 1, switching circuit 120 and load circuit 130 on demand, that is without the need to being limited to the enforcement framework of Fig. 2.As shown in Figure 2, voltage-to-current conversion circuit 210 comprises one first differential electric crystal to 212 and one first current source 214, described first differential electric crystal is made up of the first electric crystal M1 and the second electric crystal M2 212, the electric crystal M1 positive signal Vip be used for according to input signal produces a first phase signal C1 of aforementioned transferring signals, electric crystal M2 is used for producing according to the anti-phase signal Vin of input signal a second phase signal C2 of transferring signals, first current source 214 is coupled to the first differential electric crystal to 212 and one between earth terminal, with deciding to flow through the electric current I 1 of this first differential electric crystal to 212.
Please continue to refer to Fig. 2, switching circuit 220 comprises staggered the second differential electric crystal be coupled to 222(by electric crystal M3, M4 forms), 3rd differential electric crystal to 224(by electric crystal M5, M6 forms), one second current source 226 and one the 3rd current source 228, be used for performing switch motion according to preceding clock pulse signal, wherein electric crystal M3 couples aforementioned first supplemental current source 140 and the first output node O1, receive the electric current I L1 first supplemental current IS1 from load circuit 230 by this, and comprise an a dc component Lop_dc and Alternating Component Lop_ac according to the positive signal Lop(of clock pulse signal) perform switch motion, electric crystal M4 couples the second supplemental current source 150 and the second output node O2, receive the electric current I L2 from load circuit 230 and the second supplemental current IS2 by this, and comprise an a dc component Lon_dc and Alternating Component Lon_ac according to the anti-phase signal Lon(of clock pulse signal) perform switch motion, electric crystal M5 couples the first supplemental current source 140 and the first output node O1, receives the electric current I L1 first supplemental current IS1 from load circuit 230 by this, and performs switch motion according to the anti-phase signal Lon of clock pulse signal, and electric crystal M6 couples the second supplemental current source 150 and the second output node O2, receives the electric current I L2 from load circuit 230 and the second supplemental current IS2 by this, and perform switch motion according to the positive signal Lop of clock pulse signal.Be the design of symmetrical expression and positive and inversion clock pulse signal Lop at the circuit of Fig. 2, Lon respectively equals its dc component Lop_dc, Lon_dc and when making the conducting state of electric crystal M3 to M6 identical, in order to reduce the second differential electric crystal to 222 and the 3rd differential electric crystal to 224 flicker noise, second current source 226 can provide electric current I 2 to give electric crystal M1(wherein I2 < (I1/2) when the electric current (i.e. I1/2) flowing through electric crystal M1 remains unchanged), with reduce accordingly flow through the second differential electric crystal to 222 the electric current (i.e. (IL1+IS1)/2={ [(I1/2)-I2] }/2 of electric crystal M3 and the electric current (i.e. (IL2+IS2)/2={ [(I1/2)-I2] }/2 of electric crystal M4, reduce flicker noise by this, wherein via suitable design current I2 can with supplemental current IS1, IS2 interdependent (i.e. complementary or interlock), make the electric current I L1 from load circuit 230, IL2 does not reduce because of electric current I 2 or reduces over many, to avoid affecting the working range of output signal and then to affect signal gain, similarly, 3rd current source 228 can provide electric current I 3 to give electric crystal M2(wherein I3 < (I1/2) when the electric current (i.e. I1/2) flowing through electric crystal M2 remains unchanged), with reduce accordingly flow through the 3rd differential electric crystal to 222 electric current (i.e. electric current (i.e. (the IL2+IS2)/2=[(I1/2)-I3]/2 of (IL1+IS1)/2=[(I1/2)-I3]/2 and electric crystal M6 of electric crystal M5, reduce flicker noise by this, similarly, via suitable design current I3 can with supplemental current IS1, IS2 is interdependent, make the electric current I L1 from load circuit 230, IL2 does not reduce because of electric current I 3 or reduces over many, maintain the level of signal gain by this.Please note, above-mentioned explanation is when being in identical conducting state based on electric crystal M3 to M6, but, along with relationship change (the such as Lop=Lop_dc+Lop_ac (max) between non-inverting clock pulse signal Lop and inversion clock pulse signal Lon, Lon=Lon_dc+Lon_ac (min)), flow through electric crystal M3, M4 electric current may different but complementation jointly to provide electric current [(I1/2)-I2], flow through electric crystal M5, M6 electric current may different but complementation jointly to provide electric current [(I1/2)-I3].Interlock due to the conducting state of the relation between clock pulse signal Lop, Lon and electric crystal M3 to M6 belongs to the common practise of the art, and therefore unnecessary details will give memorandum at this.
Referring again to Fig. 2, load circuit 230 comprises resistance R1, R2, resistance R1 is coupled between an operating voltage VDD and the first output node O1, be used for providing according to the first phase signal C1 of aforementioned transferring signals the positive signal Vop of output signal, and resistance R2 is coupled between this operating voltage VDD and the second output node O2, be used for providing according to the second phase signal C2 of aforementioned transferring signals the anti-phase signal Von of output signal.In addition, first supplemental current source 140 is coupled between one first voltage V1 and said first node N1, and provide the first supplemental current IS1 according to this first voltage V1, furthermore, the first supplemental current IS1 large I according to first node N1 voltage and flow through switching circuit 220(in this case electric crystal M3, M5 or rather) electric current at least one of them and determine; And the second supplemental current source 150 is coupled between one second voltage V2 and aforementioned Section Point N2, to provide the second supplemental current IS2 according to this second voltage V2, similarly, the second supplemental current IS2 can according to the voltage of Section Point N2 and flow through switching circuit 220(in this case electric crystal M4, M6 or rather) electric current at least one of them and determine.In this enforcement pattern, above-mentioned first voltage V1 and this second voltage V2 is all greater than this operating voltage, for example, the electric crystal that first voltage V1 and the second voltage V2 is all more than or equal to this operating voltage VDD and this switching circuit 220 satisfy syntype critical voltage Vsat's and, or rather, first voltage V1 be greater than the critical voltage of the full syntype of operating voltage VDD and electric crystal M3 or electric crystal M5 and, the second voltage V2 be then greater than the critical voltage of the full syntype of operating voltage VDD and electric crystal M6 or electric crystal M4 with.In addition, second current source 226 of switching circuit 220 operates according to operating voltage VDD with the 3rd current source 228 is same in this example, right those skilled in the art can do appropriate change to this on demand, the second current source 226 is such as made to operate according to a tertiary voltage, 3rd current source 228 is operated according to one the 4th voltage, and wherein the 3rd and the 4th voltage is less than the operating voltage (i.e. aforementioned first and second voltage V1, V2) in first and second supplemental current source 140,150.
Note that, in the enforcement pattern of Fig. 2, circuit is symmetric design, and therefore supplemental current IS1 equals supplemental current IS2; Electric current I L1 equals electric current I L2; Electric current I 2 equals electric current I 3; And voltage V1 equals voltage V2.Separately note that the generation of described electric current and voltage or to provide be when circuit operates, because this area personage can understand the running of circuit and the difference of non-operating state, the explanation of redundancy gives memorandum at this.Though note that the electric crystal of Fig. 2 is for NMOS electric crystal again, but be embodied as in possible prerequisite, those skilled in the art can select the electric crystal be suitable for implement Fig. 2 or its equivalent electric circuit voluntarily.
Except aforementioned means invention, the present invention also discloses a kind of active frequency mixing method, be performed by the active mixer comprising voltage-to-current conversion circuit, switching circuit and load circuit, described active mixer can be frequency mixer of the present invention or its equivalent device.As shown in Figure 3, an embodiment of active frequency mixing method of the present invention comprises the following step:
Step S310: utilize a voltage-to-current conversion circuit to produce a transferring signals according to an input signal.This step can perform by the voltage-to-current conversion circuit 110 of Fig. 1 or its equivalent electric circuit;
Step S320: utilize a switching circuit to perform switch motion according to a clock pulse signal, and be electrically connected this voltage-to-current conversion circuit and a load circuit via this switch motion.This step can perform by the switching circuit 120 of Fig. 1 or its equivalent electric circuit;
Step S330: provide one first output node of an output signal between this switching circuit and this load circuit and one second output node according to this transferring signals via this switch motion.This step can perform by the load circuit 130 of Fig. 1 or its equivalent electric circuit;
Step S340: provide one first supplemental current to give this switching circuit via a first node, wherein this first node is between this first output node and this switching circuit.This step can perform by the first supplemental current source 140 of Fig. 1 or its equivalent electric circuit; And
Step S350: provide one second supplemental current to give this switching circuit via a Section Point, wherein this Section Point is between this second output node and this switching circuit.This step can perform by the second supplemental current source 150 of Fig. 1 or its equivalent electric circuit.
From the above, in the present embodiment, step S330 comprises further: the operating voltage according to this load circuit provides this output signal; Step S340 comprises further: produce this first supplemental current according to according to one first voltage; Step S350 comprises further: produce this second supplemental current according to one second voltage.Above-mentioned first voltage and the second voltage are all greater than the operating voltage of this load circuit, for example, the electric crystal that first and second voltage is all more than or equal to this operating voltage and this switching circuit satisfy syntype critical voltage and.In addition, based on a symmetrical expression design, first and second voltage above-mentioned is equal, and first and second supplemental current is equal.In addition, the large I of the first supplemental current according to said first node voltage and flow through switching circuit electric current at least one of them and determine, similarly, the second supplemental current large I according to Section Point voltage and flow through switching circuit electric current at least one of them and determine.Moreover, the present embodiment can comprise the following step further: provide one second electric current (electric current I 2 of corresponding diagram 2) and one the 3rd electric current (electric current I 3 of corresponding diagram 2) to aforesaid voltage to current converter circuit, to reduce the electric current flowing through this switching circuit, wherein the first supplemental current, the second supplemental current, the second electric current and the 3rd electric current interdependent (that is complementary or interlock).
Because the art those of ordinary skill can understand said method working of an invention details and change by device disclosure of an invention content, therefore, under the prerequisite not affecting the method disclosure of an invention requirement and exploitativeness, the explanation of repetition and redundancy will give memorandum.Note that in aforementioned explanation, the term such as " positive ", " negative " expresses relativeness but not absolute relation; In addition, in foregoing teachings, the value of voltage, electric current and resistance and the kind of electric crystal and size etc. belong to those skilled in the art of the present technique can according to the common practise person of deciding of open and this area of the present invention, thus this specification it will not go into details; Moreover in aforementioned figures, the order etc. of the shape of element, size, ratio and step is only signal, is understand the present invention for the art those of ordinary skill, be not used to limit the present invention.Separately please note, the art those of ordinary skill optionally can implement the part or all of technical characteristic of any embodiment according to disclosure of the present invention and the demand of self, or optionally implement the combination of the part or all of technical characteristic of a plurality of embodiment, increase elasticity during the invention process by this.
In sum, active mixer of the present invention and method, by providing supplemental current to improve the linearity, have been taken into account the demand of gain and noise suppressed simultaneously, also have only been needed simple circuit to realize.
Although embodiments of the invention are described above; but those embodiments are not used for limiting the present invention; the art those of ordinary skill can impose change according to the content expressed or imply of the present invention to technical characteristic of the present invention; all this kind changes the patent protection category that all may belong to sought by the present invention; in other words, scope of patent protection of the present invention must be as the criterion depending on the those as defined in claim of this specification.
Claims (20)
1. an active mixer, comprises a voltage-to-current conversion circuit, and a switching circuit and a load circuit, is characterized in that, this active mixer also comprises one first supplemental current source and one second supplemental current source, wherein:
This voltage-to-current conversion circuit is used for producing a transferring signals according to an input signal;
This switching circuit couples this voltage-to-current conversion circuit, is used for performing switch motion according to a clock pulse signal, and is electrically connected this voltage-to-current conversion circuit and this load circuit via this switch motion;
This load circuit couples this switching circuit, and being used for provides an output signal in one first output node and one second output node via this switch motion according to this transferring signals;
This first supplemental current source couples the first node between this switching circuit and this first output node, is used to provide one first supplemental current and gives this switching circuit; And
This second supplemental current source couples the Section Point between this switching circuit and this second output node, is used to provide one second supplemental current and gives this switching circuit.
2. the active mixer of claim 1, wherein this load circuit is coupled between an operating voltage and this switching circuit in time operating, this first supplemental current provides this first supplemental current according to one first voltage when coming from running, this second supplemental current provides this second supplemental current according to one second voltage when coming from running, and this first voltage and this second voltage are all greater than this operating voltage.
3. the active mixer of claim 2, wherein this first and second voltage is equal, and this first and second supplemental current is equal.
4. the active mixer of Claims 2 or 3, the electric crystal that wherein this first and second voltage is all more than or equal to this operating voltage and this switching circuit satisfy syntype critical voltage and.
5. the active mixer of claim 2, wherein this voltage-to-current conversion circuit comprises:
One first differential electric crystal pair, comprise one first electric crystal and one second electric crystal, this first electric crystal is used for producing according to this input signal a first phase signal of this transferring signals, and this second electric crystal is used for producing according to this input signal a second phase signal of this transferring signals; And
At least one first current source, is coupled between this first differential electric crystal pair and an earth terminal, with deciding to flow through the right electric current of this first differential electric crystal.
6. the active mixer of claim 2 or 5, wherein this switching circuit comprises:
One second differential electric crystal pair, couples this first and second supplemental current source and this first and second output node, is used for performing this switch motion according to this clock pulse signal;
One the 3rd differential electric crystal pair, couples this first and second supplemental current source and this first and second output node, is used for performing this switch motion according to this clock pulse signal;
One second current source, couples this second differential electric crystal pair, is used for reducing flowing through the right electric current of this second differential electric crystal; And
One the 3rd current source, couples the 3rd differential electric crystal pair, is used for reducing flowing through the right electric current of the 3rd differential electric crystal.
7. the active mixer of claim 6, wherein this second and the 3rd the operating voltage of current source be less than this first and second voltage.
8. active mixer according to claim 6, wherein this first supplemental current be according to this first node voltage and flow through this switching circuit electric current at least one of them and determine, this second supplemental current be according to this Section Point voltage and flow through this switching circuit electric current at least one of them and determine.
9. active mixer according to claim 6, wherein the electric current of this first supplemental current, the second supplemental current, this second current source and the electric current of the 3rd current source interdependent.
10. the active mixer of claim 1, wherein this voltage-to-current conversion circuit comprises:
One first differential electric crystal pair, comprise one first electric crystal and one second electric crystal, this first electric crystal is used for producing according to this input signal a first phase signal of this transferring signals, and this second electric crystal is used for producing according to this input signal a second phase signal of this transferring signals; And
At least one first current source, is coupled between this first differential electric crystal pair and an earth terminal, with deciding to flow through the right electric current of this first differential electric crystal.
The active mixer of 11. claims 10, wherein this switching circuit comprises:
One second differential electric crystal pair, couples this first and second supplemental current source, this first and second output node and this first electric crystal, is used for performing this switch motion according to this clock pulse signal;
One the 3rd differential electric crystal pair, couples this first and second supplemental current source, this first and second output node and this second electric crystal, is used for performing this switch motion according to this clock pulse signal;
One second current source, couples this first electric crystal and this second differential electric crystal pair, is used to provide a part for the electric current flowing through this first electric crystal, reduces flowing through the right electric current of this second differential electric crystal by this; And
One the 3rd current source, couples this second electric crystal and the 3rd differential electric crystal pair, is used to provide a part for the electric current flowing through this second electric crystal, reduces flowing through the right electric current of the 3rd differential electric crystal by this.
The active mixer of 12. claims 11, be coupled between a tertiary voltage and this first electric crystal when wherein this second electric current comes from running, 3rd electric current couples when coming from running between one the 4th voltage and this second electric crystal, and the 3rd and the 4th voltage is less than the operating voltage in this first and second supplemental current source.
The active mixer of 13. claims 11, wherein this first supplemental current be according to this first node voltage and flow through this switching circuit electric current at least one of them and determine, this second supplemental current be according to this Section Point voltage and flow through this switching circuit electric current at least one of them and determine.
The active mixer of 14. claims 11, wherein the electric current of this first supplemental current, the second supplemental current, this second current source and the electric current of the 3rd current source interdependent.
15. 1 kinds of active frequency mixing methods, are performed by the active mixer comprising a voltage-to-current conversion circuit, a switching circuit and a load circuit, it is characterized in that, comprise:
This voltage-to-current conversion circuit is utilized to produce a transferring signals according to an input signal;
Utilize this switching circuit to perform switch motion according to a clock pulse signal, and be electrically connected this voltage-to-current conversion circuit and this load circuit via this switch motion;
One first output node of an output signal between this switching circuit and this load circuit and one second output node is provided according to this transferring signals via this switch motion;
There is provided one first supplemental current to give this switching circuit via a first node, wherein this first node is between this first output node and this switching circuit; And
There is provided one second supplemental current to give this switching circuit via a Section Point, wherein this Section Point is between this second output node and this switching circuit.
The active frequency mixing method of 16. claims 15, the operating voltage that the step wherein producing this output signal comprises according to this load circuit produces this output signal; There is provided the step of this first supplemental current to comprise and produce this first supplemental current according to one first voltage; There is provided the step of this second supplemental current to comprise and produce this second supplemental current according to one second voltage, and this first voltage and this second voltage are all greater than the operating voltage of this load circuit.
The active frequency mixing method of 17. claims 16, wherein this first and second voltage is equal, and this first and second supplemental current is equal.
The active frequency mixing method of 18. claims 16 or 17, the electric crystal that wherein this first and second voltage is all more than or equal to this operating voltage and this switching circuit satisfy syntype critical voltage and.
The active frequency mixing method of 19. claims 15, wherein this first supplemental current be according to this first node voltage and flow through this switching circuit electric current at least one of them and determine, this second supplemental current be according to this Section Point voltage and flow through this switching circuit electric current at least one of them and determine.
The active frequency mixing method of 20. claims 15 or 19, comprises further:
There is provided one second electric current and one the 3rd electric current to this voltage-to-current conversion circuit, to reduce the electric current flowing through this switching circuit,
Wherein this first supplemental current, the second supplemental current, the second electric current and the 3rd circuit current are interdependent.
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| CN (1) | CN104767489B (en) |
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| CN104767489B (en) | 2018-10-26 |
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