CN104767489B - Active mixer and active frequency mixing method - Google Patents
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- CN104767489B CN104767489B CN201410008130.XA CN201410008130A CN104767489B CN 104767489 B CN104767489 B CN 104767489B CN 201410008130 A CN201410008130 A CN 201410008130A CN 104767489 B CN104767489 B CN 104767489B
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Abstract
The invention discloses active mixers and active frequency mixing method.The active mixer includes：One voltage-to-current conversion circuit is used for generating a transferring signals according to an input signal；One switching circuit couples the voltage-to-current conversion circuit, is used for executing switch motion according to a time pulse signal, and be electrically connected the voltage-to-current conversion circuit and a load circuit via the switch motion；The load circuit couples the switching circuit, is used for providing an output signal in one first output node and one second output node according to the transferring signals via the switch motion of the switching circuit；One first supplemental current source couples the first node between the switching circuit and first output node, and the switching circuit is given for providing one first supplemental current；And one second supplemental current source, the second node between the switching circuit and second output node is coupled, the switching circuit is given for providing one second supplemental current.
Description
Technical field
The present invention relates to frequency mixers and frequency mixing method, especially with respect to active mixer and active frequency mixing method.
Background technology
Frequency mixer is the frequency for converting an input signal, mainly so that input signal is interrogated with switch by switching circuit
It number is multiplied and to realize.The input of one frequency mixer includes a RF signal and a local oscillations signal, and output is then according to the local
The RF signal is carried out the intermediate frequency signal after shift frequency by oscillation signal.Typically, frequency mixer can be applied to a transmission system
The frequency down circuit of the raising frequency circuit of system or a reception system, and passive type frequency mixer and active mixer can be divided into.It compares
In active mixer, although the linearity of passive type frequency mixer is preferable, it can not provide conversion gain, therefore for using
For the system of passive type frequency mixer, front stage circuits larger gain must be provided constrain late-class circuit generation noise, this
Outside, the oscillation signal of passive type frequency mixer and the isolation of RF signal are poor, be easy to cause the problem of oscillation signal radiates.Extremely
In active mixer, saturation area is operated in transistor（Saturation Region）When, radio-frequency voltage is converted to electricity
Stream, and frequency conversion is carried out in such a way that switching circuit is according to switch signal output current, then the output electricity of switching circuit
Stream generates output voltage via output loading again, therefore active mixer has a conversion gain.It is mixed compared to passive type
Device, the conversion gain of active mixer can provide preferable noise inhibiting ability, but the framework of active mixer must be in
Voltage is distributed to voltage-to-current conversion circuit, switching circuit and load circuit in the voltage extent of supply, while being each electricity
Road retains the signal amplitude of oscillation appropriate for normal operation, therefore design ampleness is smaller, and the linearity is poor.Furthermore, actively
Formula frequency mixer need to often make trade-offs between noise, the linearity and conversion gain, with a double-balance active mixer device（Also known as
Gilbert Cell）For, the transistor for receiving local oscillations signal is flowed through by reduction（Claim switch transistor afterwards）'s
Although electric current can reduce flicker noise（Flicker Noise）, but this measure can increase the transistor of received RF signal（After claim
Input transistor）The equiva lent impedance seen toward the switch transistor direction so that input transistor is receiving larger radio frequency
When signal, it is easy to enter triode region by saturation area（Triode Region）, and influence the linearity of frequency mixer；In addition, by
Although can improve gain by the load impedance of increase intermediate frequency signal output end, this measure can equally reduce and flow through switch transistor
Electric current, and then influence frequency mixer the linearity；Furthermore with the evolution of manufacture of semiconductor, the maximum of transistor after micro
Operation voltage becomes smaller, if preferential at this time ensure that switch transistor is operated in saturation area with transistor is inputted（That is, preferentially ensure line
Property degree）, the signal amplitude of oscillation of intermediate frequency signal output end will be sacrificed（That is, gain will be sacrificed）, and be unfavorable at follow-up signal
Reason, if but the preferential signal amplitude of oscillation for ensuring output end, it switchs transistor and is entered by saturation area with the workspace for inputting transistor
The probability of triode region will improve, and in turn result in the loss of mixer linearity degree.It is asked for derived from above-mentioned low operating voltage
Topic improves those problems in spite of the part prior art using Source degeneration design, but Source degeneration design can lead to gain
Become smaller or circuit area increase the problem of, designer can equally faced awkward.
Related art see Publication No. 20090029668 U.S. Patent application and following patent number institute it is right
The United States Patent (USP) answered：5548840；6078802；6639447；7816970；7948294.
Invention content
In view of the missing of the prior art, of the invention one is designed to provide a kind of active mixer and frequency mixing method,
To solve problem of the prior art.
The invention discloses a kind of active mixers, can improve in the case of taking into account gain with noise suppressed linear
Degree.One embodiment of the active mixer includes：One voltage-to-current conversion circuit, a switching circuit, a load circuit, one
First supplemental current source and one second supplemental current source；Wherein, which is used for according to an input signal
Generate a transferring signals；The switching circuit couples the voltage-to-current conversion circuit, is used for executing according to a clock pulses signal
Switch motion, and it is electrically connected the voltage-to-current conversion circuit and the load circuit via the switch motion；The load circuit
The switching circuit is coupled, is used for providing an output signal in one the according to the transferring signals via the switch motion of the switching circuit
One output node and one second output node；The first supplemental current source couples between the switching circuit and first output node
A first node, give the switching circuit for providing one first supplemental current；And the second supplemental current source couples this and opens
A second node between powered-down road and second output node gives the switching circuit for providing one second supplemental current.
Also disclosed is a kind of active frequency mixing methods, can take into account gain, noise suppressed and the linearity, are by wrapping
An active mixer containing a voltage-to-current conversion circuit, a switching circuit and a load circuit executes.This is active
One embodiment of frequency mixing method includes：Using a voltage-to-current conversion circuit transferring signals are generated according to an input signal；
Switch motion is executed according to a clock pulses signal using a switching circuit, and the voltage is electrically connected extremely via the switch motion
Current converter circuit and a load circuit；An output signal is provided in switch electricity according to the transferring signals via the switch motion
One first output node between road and the load circuit and one second output node provide one first via a first node and mend
Charging stream gives the switching circuit, and wherein the first node is located between first output node and the switching circuit；And via
One second node provides one second supplemental current and gives the switching circuit, and the wherein second node is located at second output node and is somebody's turn to do
Between switching circuit.
Feature, implementation and effect for the present invention, hereby attached drawing being coordinated to make preferred embodiment, detailed description are as follows.
Description of the drawings
Fig. 1 is the schematic diagram of an embodiment of the active mixer of the present invention；
Fig. 2 is the schematic diagram of an implementation pattern of the active mixer of Fig. 1；And
Fig. 3 is the schematic diagram of an embodiment of the active frequency mixing method of the present invention.
Wherein, the reference numerals are 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 transistors pair
214 first current sources
220 switching circuits
222 second differential transistors pair
The differential transistor pair of 224 thirds
226 second current sources
228 third current sources
O1, O2, N1, N2 node
C1, C2 transferring signals
Vop, Von output signal
Vip, Vin input signal
Lop, Lon clock pulses signal
IS1, IS2 supplemental current
M1, M2, M3, M4, M5, M6 transistor
I1, I2, I3, IL1, IL2 electric current
VDD operating voltages
V1 first voltages
V2 second voltages
R1, R2 resistance
S310 generates a transferring signals using a voltage-to-current conversion circuit according to an input signal
S320 executes switch motion using a switching circuit according to a clock pulses signal, and via switch motion electricity
Property connects the voltage-to-current conversion circuit and a load circuit
S330 provides an output signal in the switching circuit and the load via the switch motion according to the transferring signals
One first output node between circuit and one second output node
S340 provides one first supplemental current via a first node and gives the switching circuit, and wherein the first node is located at
Between first output node and the switching circuit
S350 provides one second supplemental current via a second node and gives the switching circuit, and wherein the second node is located at
Between second output node and the switching circuit
Specific implementation mode
The technology of the following description idiom for being reference the art, as this specification has part term
Be illustrated or define, the explanation of the part term be subject to this specification explanation or definition.
The disclosure includes active mixer and active frequency mixing method, can take into account gain and noise
Improve the linearity in the case of inhibition.The device and method can be applied to an integrated circuit（Such as one communication IC）Or one system dress
It sets（A such as fixed or portable communication device）, and under the premise of being embodied as possible, the art ordinary skill people
Member can select equivalent element or step to realize the present invention, that is, the implementation of the present invention according to the disclosure of the specification
The embodiment chatted after being not limited to.By the active mixer subelement that is included of the present invention it is independent for may be
Know element, therefore under the premise of not influencing the abundant open and exploitativeness of the device inventions, illustrates below for Known Elements
The details of part will give memorandum.In addition, the active frequency mixing method of the present invention can be by the frequency mixer or its equivalent dress of the present invention
It sets to execute, under the premise of not influencing the abundant open and exploitativeness of this method invention, the explanation of following methods invention will
Focus on step content rather than hardware.
Referring to Fig. 1, its schematic diagram for an embodiment of the active mixer of the present invention, as shown in Figure 1, this implementation
Example active mixer 100 include：One 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.The voltage-to-current conversion circuit 110 is, for example, one
Transduction amplifier is used for generating a transferring signals according to an input signal.The switching circuit 120 couples voltage to electric current and converts
Circuit 110 is used for according to a clock pulses signal（It is equal to or is derived from an oscillation signal）Switch motion is executed, and is opened via this
Pass action is electrically connected voltage-to-current conversion circuit 110 and load circuit 130.The load circuit 130 couples switching circuit
120, it is used for providing one according to the transferring signals of voltage-to-current conversion circuit 110 via the switch motion of switching circuit 120 defeated
Go out signal in one first output node O1 and one second output node O2.First supplemental current source 140 couples switching circuit
120 and the first first node N1 between output node O1, switching circuit 120 is given for providing one first supplemental current IS1, by
This is not reduced in the impedance of load circuit 130（That is, constant or raising）In the case of, it is ensured that flow through the electric current of switching circuit 120
Amount, to improve the linearity.Similarly, second supplemental current source 150 couples between switching circuit 120 and the second output node O2
A second node N2, give switching circuit 120 for providing one second supplemental current IS2, equally can be in the resistance of load circuit 130
Resist under nondecreasing situation, improves the linearity.
Referring to Fig. 2, it is the schematic diagram of an implementation pattern of the active mixer 100 of Fig. 1, in this implementation pattern,
Active mixer 200 is derived from the framework of a double-balance active mixer device, and is used as frequency demultiplier, therefore aforementioned defeated
It is RF signal to enter signal herein, and output signal is then intermediate frequency signal, and it is citing that so this, which implements pattern only, and the art is common
Technical staff can select known mixer framework to implement the conversion circuit 110, switching circuit 120 and load of Fig. 1 on demand
Circuit 130, that is, the implementation framework without being limited to Fig. 2.As shown in Fig. 2, voltage-to-current conversion circuit 210 includes one first
Differential transistor pair 212 and one first current source 214, the first differential transistor pair 212 is by the first transistor M1 and second
Transistor M2 is formed, and transistor M1 is used for generating the one first of aforementioned transferring signals according to the positive signal Vip of input signal
Phase signal C1, transistor M2 are used for generating a second phase signal of transferring signals according to the reverse phase signal Vin of input signal
C2, the first current source 214 are then coupled between the first differential transistor pair 212 and a ground terminal, for determine to flow through this first
The electric current I1 of differential transistor pair 212.
Please continue to refer to Fig. 2, switching circuit 220 includes the second differential transistor pair 222 of staggeredly coupling（By transistor
M3, M4 are formed）, the differential transistor pair of third 224（It is made of transistor M5, M6）, one second current source 226 and a third electric current
Source 228 is used for executing switch motion according to preceding clock pulse signal, and wherein transistor M3 couples aforementioned first supplemental current source
The 140 and first output node O1, thereby receives electric current IL1 the first supplemental current IS1 from load circuit 230, and when foundation
The positive signal Lop of clock signal（Including an a dc component Lop_dc and Alternating Component Lop_ac）It is dynamic to execute switch
Make；Transistor M4 couples the second supplemental current source 150 and the second output node O2, thereby receives the electricity from load circuit 230
IL2 and the second supplemental current IS2 is flowed, and according to the reverse phase signal Lon of clock pulses signal（Including a dc component Lon_dc with
One Alternating Component Lon_ac）To execute switch motion；Transistor M5 couples the first supplemental current source 140 and the first output node
O1 thereby receives electric current IL1 the first supplemental current IS1 from load circuit 230, and is interrogated according to the reverse phase of clock pulses signal
Number Lon executes switch motion；And transistor M6 couples the second supplemental current source 150 and the second output node O2, thereby connects
Electric current IL2 and the second supplemental current IS2 from load circuit 230 are received, and is come according to the positive signal Lop of clock pulses signal
Execute switch motion.It is that symmetrical design and positive are respectively equal to inversion clock pulse signal Lop, Lon in the circuit of Fig. 2
Its dc component Lop_dc, Lon_dc and make transistor M3 to M6 conducting state it is identical in the case of, in order to reduce by second
The flicker noise of the differential transistor pair of differential transistor pair 222 and third 224, the second current source 226 can flow through transistor M1
Electric current（That is I1/2）Electric current I2 is provided in the case of remaining unchanged and gives transistor M1（Wherein I2 < (I1/2)）, with correspondingly
Reduce the electric current for the transistor M3 for flowing through the second differential transistor pair 222（That is (IL1+IS1)/2={s [(I1/2)-I2]}/2
With the electric current of transistor M4（That is (IL2+IS2)/2={s [(I1/2)-I2]}/2, thereby reduce flicker noise, wherein via suitable
When design current I2 can be interdependent with supplemental current IS1, IS2（I.e. complementary or gearing）So that the electric current from load circuit 230
IL1, IL2 are not reduced or are reduced because of electric current I2 excessively, to avoid the working range for influencing output signal and then influence signal increasing
Benefit；Similarly, third current source 228 can be in the electric current for flowing through transistor M2（That is I1/2）Electric current is provided in the case of remaining unchanged
I3 gives transistor M2（Wherein I3 < (I1/2)）, correspondingly to reduce the transistor M5 for flowing through the differential transistor pair of third 222
Electric current（That is (IL1+IS1)/2=[(I1/2)-I3]The electric current of/2 and transistor M6（That is (IL2+IS2)/2=[(I1/
2)-I3]/ 2, flicker noise is thereby reduced, similarly, can be interdependent with supplemental current IS1, IS2 via appropriately designed electric current I3,
So that electric current IL1, IL2 from load circuit 230 are not reduced or reduced because of electric current I3 excessively, signal gain is thereby maintained
It is horizontal.It note that above description is in the case of identical conducting state based on transistor M3 to M6, however, with positive
Relationship change between clock pulses signal Lop and inversion clock pulse signal Lon（Such as Lop=Lop_dc+Lop_ac
(max), Lon=Lon_dc+Lon_ac (min)）, the electric current for flowing through transistor M3, M4 may be different but complementary to provide jointly
Electricity Liu [(I1/2)-I2], the electric current for flowing through transistor M5, M6 may be different but complementary to provide electricity Liu [ jointly;(I1/2)-
I3].Since the gearing of relationship and the conducting state of transistor M3 to M6 between clock pulses signal Lop, Lon belongs to this technology
The common knowledge in field, therefore unnecessary details will give memorandum herein.
Referring again to Fig. 2, load circuit 230 includes resistance R1, R2, and resistance R1 is coupled to an operating voltage VDD and first
Between output node O1, it is used for providing the positive signal Vop of output signal according to the first phase signal C1 of aforementioned transferring signals,
And resistance R2 is coupled between operating voltage VDD and the second output node O2, is used for the second phase according to aforementioned transferring signals
Position signal C2 provides the reverse phase signal Von of output signal.In addition, the first supplemental current source 140 be coupled to a first voltage V1 with
Between said first node N1, and the first supplemental current IS1 is provided according to first voltage V1, furthermore, the first supplement
The size of electric current IS1 can according to first node N1 voltage and flow through switching circuit 220（More precisely it is transistor herein
M3,M5）Electric current at least one and determine；And the second supplemental current source 150 be coupled to a second voltage V2 with it is aforementioned
Between second node N2, to provide the second supplemental current IS2 according to second voltage V2, similarly, the second supplemental current IS2 can
According to second node N2 voltage and flow through switching circuit 220（More precisely it is transistor M4, M6 herein）Electric current extremely
Lack one of them and determines.In this implementation pattern, above-mentioned first voltage V1 and second voltage V2 is all higher than the operating voltage, lifts
For example, first voltage V1 and second voltage V2 is all higher than or the electricity crystalline substance equal to operating voltage VDD and the switching circuit 220
Body satisfy syntype critical voltage Vsat sum, more precisely, first voltage V1 be more than operating voltage VDD and transistor M3 or
The sum of the critical voltage of the full syntype of transistor M5, second voltage V2 is then more than operating voltage VDD and transistor M6 or electricity is brilliant
The sum of the critical voltage of the full syntype of body M4.In addition, the second current source 226 of switching circuit 220 and third current source 228 in
It is equally operated according to operating voltage VDD in this example, right those skilled in the art can on demand make this appropriate change, such as make second
Current source 226 is operated according to a tertiary voltage, so that third current source 228 is operated according to one the 4th voltage, wherein third and the 4th
Voltage is less than the operating voltage in first and second supplemental current source 140,150（I.e. aforementioned first and second voltage V1, V2）.
In the implementation pattern that note that Fig. 2, circuit is symmetric design, therefore supplemental current IS1 is equal to supplemental current IS2；
Electric current IL1 is equal to electric current IL2；Electric current I2 is equal to electric current I3；And voltage V1 is equal to voltage V2.It separately note that the electric current and electricity
The generation or offer of pressure are when circuit operates, since this field personage will be seen that the area of the running and non-operating state of circuit
Not, the explanation of redundancy gives memorandum herein.Though note that the transistor of Fig. 2 again by taking NMOS transistors as an example, however it is being embodied as
In possible premise, those skilled in the art can voluntarily select applicable transistor to implement Fig. 2 or its equivalent circuit.
In addition to aforementioned device is invented, the present invention also discloses a kind of active frequency mixing method, is by turning comprising voltage to electric current
The active mixer of circuit, switching circuit and load circuit is changed to execute, the active mixer can be of the invention
Frequency mixer or its equivalent device.As shown in figure 3, an embodiment of the active frequency mixing method of the present invention comprises the steps of：
Step S310：Using a voltage-to-current conversion circuit transferring signals are generated according to an input signal.This step
It can be executed by the voltage-to-current conversion circuit 110 or its equivalent circuit of Fig. 1；
Step S320：Switch motion is executed according to a clock pulses signal using a switching circuit, and dynamic via the switch
Make to be electrically connected the voltage-to-current conversion circuit and a load circuit.This step can by the switching circuit 120 of Fig. 1 or its etc.
Circuit is imitated to execute；
Step S330：An output signal is provided via the switch motion according to the transferring signals to bear in the switching circuit and this
Carry one first output node and one second output node between circuit.This step can by the load circuit 130 of Fig. 1 or its etc.
Circuit is imitated to execute；
Step S340：One first supplemental current is provided via a first node and gives the switching circuit, wherein the first node
Between first output node and the switching circuit.This step can be by the first supplemental current source 140 of Fig. 1 or its is equivalent
Circuit executes；And
Step S350：One second supplemental current is provided via a second node and gives the switching circuit, wherein the second node
Between second output node and the switching circuit.This step can be by the second supplemental current source 150 of Fig. 1 or its is equivalent
Circuit executes.
From the above, in the present embodiment, step S330 is further included：Operating voltage according to the load circuit provides should
Output signal；Step S340 is further included：First supplemental current is generated according to according to a first voltage；Step S350 is into one
Step includes：Second supplemental current is generated according to a second voltage.Above-mentioned first voltage is all higher than load electricity with second voltage
The operating voltage on road, for example, first and second voltage be all higher than or equal to the operating voltage and the switching circuit an electricity
The sum of the critical voltage of the full syntype of crystal.In addition, based on a symmetrical design, first and second above-mentioned voltage is equal, and the
One is equal with the second supplemental current.In addition, the size of the first supplemental current can according to said first node voltage and flow through out
The electric current on powered-down road at least one and determine, similarly, the size of the second supplemental current can be according to the voltage of second node
And flow through switching circuit electric current at least one and determine.Furthermore the present embodiment can further include the following steps：
One second electric current is provided（The electric current I2 of corresponding diagram 2）With a third electric current（The electric current I3 of corresponding diagram 2）To aforesaid voltage to electric current
Conversion circuit flows through the electric current of the switching circuit to reduce, wherein the first supplemental current, the second supplemental current, the second electric current with
And third electric current is interdependent（That is, complementary or gearing）.
Since those of ordinary skill in the art can understand above method invention by the disclosure of device inventions
Implementation detail and variation, therefore, not influencing the open request of this method invention and under the premise of exploitativeness, repeat and superfluous
Remaining explanation will give memorandum.Note that in preceding description, the terms such as " positive ", " negative " be expression relativeness rather than absolutely
To relationship；In addition, in foregoing teachings, voltage, the type of the value of electric current and resistance and transistor and size etc. belong to this technology
Field technology personnel can the common knowledge of disclosure under this invention and this field carry out decision maker, therefore it will not go into details for this specification；Again
Person, in aforementioned figures, the shape of element, size, the sequence etc. of ratio and step are only to illustrate, and are common for the art
Technical staff understands the present invention and is used, non-limiting the present invention.It is another to note that those of ordinary skill in the art be according to this
The disclosure of invention and the demand of itself selectively implement some or all of any embodiment technical characteristic, or selection
Property implement the combination of some or all of a plurality of embodiments technical characteristic, thereby increase the elasticity when present invention is implemented.
In conclusion the active mixer of the present invention improves the linearity with method by supplemental current is provided, simultaneously
The demand of gain and noise suppressed has been taken into account, has also only needed simple circuit to realize.
Although the embodiment of the present invention is as described above, however those embodiments are not used for limiting the present invention, this technology neck
Domain those of ordinary skill can be according to the present invention the content expressed or implied to the present invention technical characteristic impose variation, it is all such
Kind variation may belong to the patent protection scope sought by the present invention, and in other words, scope of patent protection of the invention must regard this
Subject to the those as defined in claim of specification.
Claims (18)
1. a kind of active mixer a, including voltage-to-current conversion circuit, a switching circuit and a load circuit, feature
Be, the active mixer also include one first supplemental current source and one second supplemental current source, wherein：
The voltage-to-current conversion circuit is used for generating a transferring signals according to an input signal；
The switching circuit couples the voltage-to-current conversion circuit, is used for executing switch motion according to a clock pulses signal, and
It is electrically connected the voltage-to-current conversion circuit and the load circuit via the switch motion；
The load circuit couples the switching circuit, be used for via the switch motion according to the transferring signals provide an output signal in
One first output node and one second output node；
The first supplemental current source couples the first node between the switching circuit and first output node, for providing one
First supplemental current gives the switching circuit；And
The second supplemental current source couples the second node between the switching circuit and second output node, for providing one
Second supplemental current gives the switching circuit；
Wherein the load circuit is coupled to when running between an operating voltage and the switching circuit, which is derived from
First supplemental current is provided according to a first voltage when running, according to a second voltage when second supplemental current is derived from running
Second supplemental current is provided, and the first voltage is all higher than the operating voltage with the second voltage.
2. the active mixer of claim 1, wherein first and second voltage are equal, and first and second supplemental current
It is equal.
3. the active mixer of claims 1 or 2, wherein first and second voltage be all higher than or equal to the operating voltage with
The sum of the critical voltage of the full syntype of one transistor of the switching circuit.
4. the active mixer of claim 1, the wherein voltage-to-current conversion circuit include：
One first differential transistor pair, including one first transistor and one second transistor, which is used for foundation should
Input signal generates a first phase signal of the transferring signals, which is used for generating this turn according to the input signal
Change a second phase signal of signal；And
At least one first current source is coupled between the first differential transistor pair and a ground terminal, for determine to flow through this
The electric current of one differential transistor pair.
5. the active mixer of claim 1 or 4, the wherein switching circuit include：
One second differential transistor pair couples first and second supplemental current source and first and second output node, is used for
The switch motion is executed according to the clock pulses signal；
The differential transistor pair of one third couples first and second supplemental current source and first and second output node, is used for
The switch motion is executed according to the clock pulses signal；
One second current source couples the second differential transistor pair, for reducing the electric current for flowing through the second differential transistor pair；
And
One third current source couples the differential transistor pair of the third, for reducing the electric current for flowing through the differential transistor pair of the third.
6. the active mixer of claim 5, wherein this second with the operating voltage of third current source be less than this first and the
Two voltages.
7. the active mixer described in claim 5, wherein first supplemental current be according to the first node voltage with
And flow through the switching circuit electric current at least one and determine, which is the electricity according to the second node
It presses and flows through at least one of the electric current of the switching circuit and determine.
8. the active mixer described in claim 5, wherein first supplemental current, the second supplemental current, second electric current
The electric current of the electric current in source and the third current source is interdependent.
9. the active mixer of claim 1, the wherein voltage-to-current conversion circuit include：
One first differential transistor pair, including one first transistor and one second transistor, which is used for foundation should
Input signal generates a first phase signal of the transferring signals, which is used for generating this turn according to the input signal
Change a second phase signal of signal；And
At least one first current source is coupled between the first differential transistor pair and a ground terminal, for determine to flow through this
The electric current of one differential transistor pair.
10. the active mixer of claim 9, the wherein switching circuit include：
One second differential transistor pair couples first and second supplemental current source, first and second output node and is somebody's turn to do
First transistor, for executing the switch motion according to the clock pulses signal；
The differential transistor pair of one third couples first and second supplemental current source, first and second output node and is somebody's turn to do
Second transistor, for executing the switch motion according to the clock pulses signal；
One second current source couples first transistor and the second differential transistor pair, and the first electricity crystalline substance is flowed through for providing
A part for the electric current of body thereby reduces the electric current for flowing through the second differential transistor pair；And
One third current source couples second transistor and the differential transistor pair of the third, and the second electricity crystalline substance is flowed through for providing
A part for the electric current of body thereby reduces the electric current for flowing through the differential transistor pair of the third.
It is coupled to a tertiary voltage when 11. the active mixer of claim 10, wherein second electric current are derived from running and is somebody's turn to do
Between first transistor, when the third electric current is derived from running between one the 4th voltage of coupling and second transistor, and the third
It is less than the operating voltage in first and second supplemental current source with the 4th voltage.
12. the active mixer of claim 10, wherein first supplemental current be according to the first node voltage and
It flows through at least one of the electric current of the switching circuit and determines, which is the voltage according to the second node
And flow through the switching circuit electric current at least one and determine.
13. the active mixer of claim 10, wherein first supplemental current, the second supplemental current, second current source
Electric current and the third current source electric current it is interdependent.
14. a kind of active frequency mixing method is by comprising a voltage-to-current conversion circuit, a switching circuit and a load circuit
An active mixer execute, which is characterized in that include：
Using the voltage-to-current conversion circuit transferring signals are generated according to an input signal；
Switch motion is executed according to a clock pulses signal using the switching circuit, and the electricity is electrically connected via the switch motion
It is depressed into current converter circuit and the load circuit；
An output signal is provided between the switching circuit and the load circuit according to the transferring signals via the switch motion
One first output node and one second output node；
One first supplemental current is provided via a first node and gives the switching circuit, and wherein the first node is located at first output
Between node and the switching circuit；And
One second supplemental current is provided via a second node and gives the switching circuit, and wherein the second node is located at second output
Between node and the switching circuit；
The step of wherein generating the output signal generates the output signal comprising the operating voltage according to the load circuit；There is provided should
The step of first supplemental current includes to generate first supplemental current according to a first voltage；The step of second supplemental current is provided
It is rapid to generate second supplemental current comprising one second voltage of foundation, and the first voltage is all higher than load electricity with the second voltage
The operating voltage on road.
15. the active frequency mixing method of claim 14, wherein first and second voltage are equal, and first and second supplement
Electric current is equal.
16. the active frequency mixing method of claims 14 or 15, wherein first and second voltage are all higher than or are equal to the work
One transistor of voltage and the switching circuit satisfy syntype critical voltage and.
17. the active frequency mixing method of claim 14, wherein first supplemental current be according to the first node voltage with
And flow through the switching circuit electric current at least one and determine, which is the electricity according to the second node
It presses and flows through at least one of the electric current of the switching circuit and determine.
18. the active frequency mixing method of claim 14 or 17, further includes：
One second electric current and a third electric current are provided to the voltage-to-current conversion circuit, to reduce the electricity for flowing through the switching circuit
Stream,
Wherein first supplemental current, the second supplemental current, the second electric current and third circuit current are interdependent.
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| CN102124646A (en) * | 2008-08-18 | 2011-07-13 | 高通股份有限公司 | High-linearity low-noise receiver with load switching |
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| JP2006129416A (en) * | 2004-09-28 | 2006-05-18 | Sharp Corp | Voltage-current conversion circuit, amplifier, mixer circuit, and mobile appliance using the circuit |
| US7446590B2 (en) * | 2006-09-13 | 2008-11-04 | Mediatek Inc. | Low noise mixer with reduced distortion |
| TWI424681B (en) * | 2007-07-25 | 2014-01-21 | Realtek Semiconductor Corp | Mixer circuit and method for reducing flicker noise thereof |
| TWI365601B (en) * | 2007-09-27 | 2012-06-01 | Mstar Semiconductor Inc | High linearity mixer with programmable gain and associated transconductor |
| CN102163954B (en) * | 2011-01-30 | 2013-01-30 | 东南大学 | Low-voltage low-noise wideband mixer |
| CN202026277U (en) * | 2011-05-12 | 2011-11-02 | 上海华虹集成电路有限责任公司 | Mixer used in radio frequency identification |
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| CN102124646A (en) * | 2008-08-18 | 2011-07-13 | 高通股份有限公司 | High-linearity low-noise receiver with load switching |
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| Title |
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| 高性能CMOS混频器设计技术研究;唐守龙;《中国博士学位论文全文数据库 信息科技辑》;20070715(第01期);论文第3.1节,第4.2.1节,图3-1,图4-3 * |
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