CN208797912U - A kind of low phase noise broadband circular type shaker - Google Patents
A kind of low phase noise broadband circular type shaker Download PDFInfo
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- CN208797912U CN208797912U CN201821302024.2U CN201821302024U CN208797912U CN 208797912 U CN208797912 U CN 208797912U CN 201821302024 U CN201821302024 U CN 201821302024U CN 208797912 U CN208797912 U CN 208797912U
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Abstract
The utility model discloses a kind of low phase noise broadband circular type shakers, belong to semiconductor integrated circuit technology field, which includes first order Postponement module (1) and second level Postponement module (2).Wherein, the first order Postponement module (1) includes input and output inverter module (11), latch unit (12), switched capacitor array unit (13) and transmission gate cell (14)；Make two-stage Postponement module that can maintain to vibrate with the extra delay that latch unit (12) itself provides, saves power consumption；Oscillator signal is improved in the conversion rate at edge using the positive feedback that latch unit (12) are formed；The method for adjusting frequency using switched capacitor array unit (13) and transmission gate cell (14) variable resistance, realizes the coarse adjustment and fine tuning of the frequency of low phase noise broadband circular type shaker.The ring-like oscillator output frequencies range in the low phase noise broadband is big, and phase noise is low, low in energy consumption.
Description
Technical field
The present invention relates to semiconductor integrated circuit technology field more particularly to a kind of low phase noise broadband toroidal oscillations
Device.
Background technique
With the development of IC industry, phaselocked loop (Phase Locked Loop, PLL) be widely used in clock and
The design of frequency synthesizer.The application of clock module includes giving high performance analog to digital conversion circuit (Analog to Digital
Converter, ADC) and base band output stage interface circuit offer high-performance clock etc..These application requirement clock phase-locked loops tool
There is the output of low jitter wide frequency ranges.In general, the design of PLL is divided into two typical major class, and one kind is using inductance
The PLL of capacitance voltage-controlled oscillator (LC Voltage-Controlled Oscillator, LC-VCO), its advantages are noise-induceds
Can be good, low in energy consumption, the disadvantage is that area is big, tuning range is small；Another kind of is using ring-like voltage controlled oscillator (Ring Voltage-
Controlled Oscillator, Ring-VCO) PLL, its advantages are that tuning range is big, and area is small, process transplanting
It is good, it is not influenced vulnerable to electromagnetic coupling, the disadvantage is that noiseproof feature is poor, power consumption is relatively high.Based on the PLL of Ring-VCO due to its face
The small advantage waited of product makes design and research to it obtain the attention of engineers.
It in the PLL based on Ring-VCO, in order to improve its output phase noiseproof feature, needs to solve charge pump, divides
Device, the most basic contradiction of requirement and Ring-VCO to big bandwidth requirement to small bandwidth such as quantizing noise, the side of some mainstreams
Method optimizes the noise in band using down-sampling structure or injection locked loop etc. to allow loop using big band
Width inhibits the phase noise of Ring-VCO, the contradiction of bandwidth described above is solved, to enable the PLL based on Ring-VCO
Obtain the phase noise performance as LC-VCO PLL.But limited capture range etc. can be introduced using loops such as down-samplings to ask
Topic, so still there is realistic meaning based on traditional PLL top level structure design Ring-VCO type PLL.
In order to solve the phase noise problems of Ring-VCO type PLL, the Ring-VCO for designing low phase noise becomes especially
It is important.Present most common two kinds of prior arts are:
The prior art one: the difference amplifier loaded is made as delay cell, the connection of level Four delay cell, ring using resistance
Mono- delay cell of Lu Zhongyou is connected into in-phase version, and other delay cells are connected into reverse phase form.Delay cell such as Fig. 1 institute
Show, the delay time of delay cell is adjusted using positive feedback technique, when electric current I1 variation, the equivalent resistance of small signal of M3, M4
Anti- to change, the equivalent load impedance of differential pair can also change, and send out so as to cause the delay time of the delay cell
Changing, and then adjust the frequency of oscillator.The defect of this technology is: due to using level Four delay cell, phase noise
It can be restricted, power consumption is big, and the resistance value by adjusting negative resistance pair makes tuning range small to control frequency.Meanwhile as difference
Tuning structure needs differential charge pump configuration to control it, and limits its application in a pll.
The prior art two: single-ended transmission gate circular type shaker is converted to difference toroidal oscillation using two feedback control loops
Device simultaneously has to the anti-interference ability of power-supply fluctuation.As shown in Fig. 2, MP1 and MP2 forms first feedback control loop, for compensating
The fluctuation of delay time caused by power-supply fluctuation；MN1 and MN2 forms second feedback control loop, constitutes the latch to intercouple and uses
To realize difference operation and further realize Power supply rejection.The defect of this technology is: tuning controller part, which is in, to be prolonged
Inside slow unit, starting of oscillation is easy to be influenced by tuning voltage Vctrl in figure, also needs level Four delay cell to meet starting of oscillation
Condition, phase noise performance are restricted, and power consumption is big.
As it can be seen that Ring-VCO design is difficult to meet simultaneously that frequency range is big, and phase noise is low and low in energy consumption in the prior art
Demand.
Summary of the invention
For the design of Ring-VCO in the prior art, that there are power consumptions is big, and there are contradictions between frequency range and VCO gain, i.e.,
Gain is big when frequency range is big, and gain will increase greatly very much the area of loop filter and deteriorate PLL spurious performance, Yi Jixiang
The problems such as position noise is poor, the present invention provides a kind of low phase noise broadband circular type shaker, the low phase noise broadband is ring-like
Oscillator output frequencies range is big, and phase noise is low, low in energy consumption.
The present invention provides a kind of low phase noise broadband circular type shakers in low phase noise broadband, including the first order to prolong
Slow module and second level Postponement module；The first order Postponement module and the second level Postponement module form a loop, use
Phase shift and gain required for the offer low phase noise broadband circular type shaker starting of oscillation；
One input terminal of the first order Postponement module connects an output end of the second level Postponement module；
Another input terminal of the first order Postponement module connects the another output of the second level Postponement module；
One output end of the first order Postponement module connects an input terminal of the second level Postponement module；
The another output of the first order Postponement module connects another input terminal of the second level Postponement module；
The first order Postponement module includes the first input and output inverter module, the first latch unit, first switch
Capacitor array unit and the first transmission gate cell；
The second level Postponement module includes the second input and output inverter module, the second latch unit, second switch
Capacitor array unit and the second transmission gate cell；
The first switch capacitor array unit and the second switch capacitor array unit use identical digital control
Position is controlled；
The first transmission gate cell and the identical tuning voltage of the second transmission gate units shared.
Preferably, the first input and output inverter module includes the first phase inverter and the second phase inverter；Described first
Latch unit includes third phase inverter and the 4th phase inverter；
The input terminal of first phase inverter is an input terminal of the first order Postponement module；
The input terminal of second phase inverter is another input terminal of the first order Postponement module；
The docking of the output end of the input terminal of the third phase inverter and the 4th phase inverter, butt end connection described first
One end of the output end of phase inverter and the first switch capacitor array unit；
The docking of the input terminal of the output end of the third phase inverter and the 4th phase inverter, butt end connection described second
The other end of the output end of phase inverter and the first switch capacitor array unit.
Preferably, the first switch capacitor array unit includes one or at least two switching capacity branch in parallel
Road, every switching capacity branch is both provided with a switch capacitor equal with two capacitances, and switchs and be arranged in two capacitors
Between；The switching capacity branch carries out cut-offfing control by digital control position, to adjust the switching capacity branch output
Capacitance, for the coarse adjustment of the output frequency to low phase noise broadband circular type shaker and the division of output band.
Preferably, the first transmission gate cell includes the first transmission gate and the second transmission gate；
The input terminal of first transmission gate connects one end of the first switch capacitor array unit；First transmission
The output end of door connects an output end of low phase noise broadband circular type shaker；
The input terminal of second transmission gate connects the other end of the first switch capacitor array unit, and described second passes
The output end of defeated door connects the another output of low phase noise broadband circular type shaker.
Preferably, first transmission gate includes the first PMOS tube and the first NMOS tube；
The source electrode of first PMOS tube is connected with the source electrode of first NMOS tube；
The drain electrode of first PMOS tube is connected with the drain electrode of first NMOS tube；
The grid of first PMOS tube is provided with the port of first ground voltage of connection；
The grid of first NMOS tube is provided with the port of first tuning voltage of connection；
Second transmission gate includes the second PMOS tube and the second NMOS tube；
The source electrode of second PMOS tube is connected with the source electrode of second NMOS tube；
The drain electrode of second PMOS tube is connected with the drain electrode of second NMOS tube；
The grid of second PMOS tube is provided with the port of second ground voltage of connection；
The grid of second NMOS tube is provided with the port of second tuning voltage of connection.
Preferably, the second ground voltage that the first ground voltage of the port connection is connected with the port is equal；
The second tuning voltage that first tuning voltage of the port connection is connected with the port is equal.
Preferably, first PMOS tube, second PMOS tube, first NMOS tube and second NMOS tube are
Low threshold device, for improving the tweak gain linearity of low phase noise broadband circular type shaker.
Preferably, by adjusting the grid voltage of first NMOS tube and second NMOS tube for changing described the
The resistance value of one NMOS tube and second NMOS tube is to change the frequency of low phase noise broadband circular type shaker.
Preferably, the first order Postponement module is identical with the circuit structure of the second level Postponement module.
One or more technical solution provided in the present invention, has at least the following technical effects or advantages:
Present invention is generally directed to power consumption present in existing widely used Ring-VCO is big, frequency range and VCO gain
Between there are contradictions, i.e., gain is big when frequency range is big, and gain will increase greatly very much loop filter area and deteriorate PLL
The problems such as spurious performance and poor phase noise, proposes a kind of low phase noise broadband circular type shaker: using latch list
The extra delay that member provides itself makes two-stage Postponement module that can maintain to vibrate, and has saved power consumption；By using latch
The positive feedback that unit is formed improves oscillator signal in the conversion rate at edge；Since transmission gate cell is located at the adjusting of frequency
Except the access on power supply and ground, circuit can be increased to the anti-interference of power-supply fluctuation using such tuning manner；Meanwhile this
Invention is for the contradiction between Ring-VCO tuning range and tuning gain, using switched capacitor array unit and transmission gate cell
The method that variable resistance adjusts frequency, realizes the coarse adjustment and fine tuning of the frequency of low phase noise broadband circular type shaker, this
It is beneficial to the inhibition of PLL output factors；In addition, improving Ring-VCO's using Low threshold device in the design of transmission gate
The tweak gain linearity.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the circuit diagram of delay cell in the prior art one；
Fig. 2 is the circuit diagram of differential ring oscillator in the prior art two；
Fig. 3 is a kind of structural block diagram of low phase noise broadband circular type shaker provided in an embodiment of the present invention；
Fig. 4 is the first order Postponement module in a kind of low phase noise broadband circular type shaker provided in an embodiment of the present invention
Circuit diagram；
Fig. 5 is the second level Postponement module in a kind of low phase noise broadband circular type shaker provided in an embodiment of the present invention
Circuit diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear and complete
Ground description, it is clear that described embodiment is only a part of the embodiments of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of low phase noise broadband circular type shakers, as shown in figure 3, the low phase is made an uproar
Sound broadband circular type shaker includes first order Postponement module 1 and second level Postponement module 2；First order Postponement module 1 and the second level
Postponement module 2 form a loop, be used to provide the described phase shift required for the circular type shaker starting of oscillation of low phase noise broadband and
Gain；
One output end OUT2_ of one input terminal IN1_P connection second level Postponement module 2 of first order Postponement module 1
N；
The another output of another input terminal IN1_N connection second level Postponement module 2 of first order Postponement module 1
OUT2_P；
One input terminal of one output end OUT1_P connection institute second level Postponement module 2 of first order Postponement module 1
IN2_P；
The another output OUT1_N of first order Postponement module 1 connect the second level Postponement module 2 another is defeated
Enter to hold IN2_N.
By common sense it is found that oscillator does not need external signal excitation, direct current energy can be converted to the period by its own
The circuit of property alternating current output signal.Oscillator starting of oscillation needs to meet certain starting condition for oscillation, referred to as Barkhausen criterion, i.e.,
The phase shift of loop gain is at 360 °, and the amplitude of loop gain must not drop below 1, which could generate oscillation.At this
Stable oscillation output is realized in embodiment, low phase noise broadband circular type shaker is identical by 2 circuit structures
Postponement module form a loop, and make loop transfer function only meet Barkhausen on a Frequency point and sentence
According to realizing its frequency selective characteristic.The effect of first Postponement module 1 and second Postponement module 2 is all to provide needed for starting of oscillation
The phase shift and gain wanted make the feedback control loop being made of two Postponement modules can satisfy Barkhausen criterion, realize normal
Oscillator function.
Fig. 4 is referred to, in a kind of low phase noise broadband circular type shaker provided in an embodiment of the present invention is shown
The circuit diagram of level-one Postponement module.As shown in figure 4, first order Postponement module 1 includes the first input and output inverter module
11, the first latch unit 12, first switch capacitor array unit 13 and the first transmission gate cell 14；First input and output reverse phase
Device unit 11 is used to introduce delay on signal path；Make two with the extra delay that the first latch unit 12 provides itself
Grade Postponement module can maintain to vibrate, and save power consumption；It is mentioned by using the positive feedback that the first latch unit 12 is formed
Conversion rate of the high oscillator signal at edge；Since the first transmission gate cell 14 is located at the access of power supply and ground to the adjusting of frequency
Except, circuit can be increased to the anti-interference of power-supply fluctuation using such tuning manner；Using first switch capacitor array
The method that unit 13 and the first transmission 14 variable resistance of gate cell adjust frequency, realizes low phase noise broadband toroidal oscillation
The coarse adjustment of the frequency of device and slice.
Specifically, as shown in figure 4, the first input and output inverter module 11 includes the first phase inverter X1 and the second phase inverter
X2；First latch unit 12 includes third phase inverter X3 and the 4th phase inverter X4；The input terminal connection the of first phase inverter X1
One input terminal IN1_P of level-one Postponement module 1；The input terminal of second phase inverter X2 connects the another of first order Postponement module 1
A input terminal IN1_N；The output end docking of the input terminal and the 4th phase inverter X4 of third phase inverter X3, butt end connection first are anti-
The output end of phase device X1 and one end of first switch capacitor array unit 13；The output end and the 4th phase inverter of third phase inverter X3
The input terminal of X4 docks, butt end connect the second phase inverter X2 output end and first switch capacitor array unit 13 it is another
End.
In the present embodiment, first order Postponement module 1 as shown in Figure 4 is a kind of Complementary input structure, the structure of complementary output,
It can improve oscillator signal in the conversion rate at edge as much as possible.Wherein, X1, X2 are introduced centainly on signal path
Delay；First latch unit 12 of X3, X4 composition, in generating state conversion, in output end OUT1_P and output end OUT1_
A positive feedback is formed between N, accelerates state conversion rate.
The mean-square value Γ of ISF (Impulse Sensitivity Function) function of circular type shakerrmsFormula can be used
(1) it indicates:
Wherein A=frise/ffall, friseAnd ffallIt is the greatest gradient of oscillator signal rising edge and failing edge respectively, indicates
One ratio of the greatest gradient of oscillator signal rising edge and failing edge.Circular type shaker is improved it can be seen from formula (1) upper
The state conversion rate for rising edge and failing edge, can reduce the mean-square value Γ of ISFrms, that is, reduce the low phase noise wide band loop
The phase noise performance of type oscillator.Under selected technique, state conversion rate depends mainly on crystal provided by technique
Pipe characteristic frequency, when the feature size downsizing of transistor, when characteristic frequency improves, the conversion rate of circular type shaker is available
It further increases, phase noise performance also available bigger improvement.
Therefore when the first latch unit 12 of X3, X4 composition, in generating state conversion, in output end OUT1_P and defeated
A positive feedback is formed between outlet OUT1_N, accelerates state conversion rate, that is, phase noise performance can be improved.
In addition, since the first latch unit 12 can introduce additional delay time, two-stage Postponement module
Stable oscillation stationary vibration is maintained, reducing delay cell series can also be improved phase noise performance.
Specifically, as shown in figure 4, first switch capacitor array unit 13 includes one or at least two capacitor branch in parallel
Road, every switching capacity branch are both provided with switch Ki (n of i=1,2,3,4 ..., n are the positive integer greater than 1) and two
The equal capacitor Ci of a capacitance (n of i=1,2,3,4 ..., n are positive integer) greater than 1, and switch Ki be arranged two capacitors it
Between.For example, first switching capacity branch road is provided with a switch K1 and the equal capacitor C1 of two capacitances, other switches are electric
Stream source branch structure and the structure of first switched current source branch are same or similar, no longer repeat one by one here.A plurality of parallel connection
Switching capacity branch carry out cut-offfing control by digital control position, to adjust the capacitance of switching capacity, for low phase
The coarse adjustment of the output frequency of noise wideband circular type shaker, and the broadband that low phase noise broadband circular type shaker need to be exported
Multiple frequency bands are divided into be exported.
Specifically, as shown in figure 4, the first transmission gate cell 14 includes the first transmission gate 141 and the second transmission gate 142；The
The circuit structure of one transmission gate 141 and the second transmission gate 142 is just the same；The input terminal of first transmission gate 141 connects capacitor battle array
One end of column unit 13；The output end of first transmission gate 141 connect low phase noise broadband circular type shaker one is defeated
Outlet OUT1_N；The other end of the input terminal connection first switch capacitor array unit 13 of second transmission gate 142, the second transmission gate
142 output end connects the another output OUT1_P of low phase noise broadband circular type shaker.
First transmission gate 141 includes the first PMOS tube PM1 and the first NMOS tube NM1；The source electrode of first PMOS tube PM1 and
The source electrode of first NMOS tube NM1 is connected；The drain electrode of first PMOS tube PM1 is connected with the drain electrode of the first NMOS pipe NM1；First
The grid of PMOS tube PM1 is provided with the port Port1_VSS of a first ground voltage VSS1 of connection；First NMOS tube
The grid of NM1 is provided with the port Port1_Vtune of a first tuning voltage Vtune1 of connection.
Second transmission gate 142 includes the second PMOS tube PM2 and the second NMOS tube NM2；The source electrode of second PMOS tube PM2 and
The source electrode of second NMOS tube NM2 is connected；The drain electrode of second PMOS tube PM2 is connected with the drain electrode of the 2nd NMOS pipe NM2；Second
The grid of PMOS tube PM2 is provided with the port Port2_VSS of a second ground voltage VSS2 of connection；Second NMOS tube NM2's
Grid is provided with the port Port2_Vtune of a second tuning voltage Vtune2 of connection.
The first ground connection electricity that the first ground voltage VSS1 and the end Port2_VSS of port Port1_VSS connection are connected
Press VSS2 equal；What the second tuning voltage Vtune1 and the port Port2_Vtune of port Port1_Vtune connection were connected
Second tuning voltage Vtune2 is equal.
In the present embodiment, the first PMOS tube PM1, the second PMOS tube PM2, the first NMOS tube NM1 and the second NMOS tube NM2
For Low threshold device, for improving the tweak gain linearity of low phase noise broadband circular type shaker.With traditional MOS
Device is compared, and Low threshold device reduces the doping concentration of substrate on domain, and the threshold voltage of metal-oxide-semiconductor refers to form strong inversion
When minimum gate voltage.When sheet electron concentration is equal to homeostasis majority carrier density, semiconductor surface forms strong anti-regulation
Type layer, so the threshold voltage of MOS accordingly reduces when the doping concentration of substrate reduces.Thus during making MOS resistance tuning
Tuning gain change reduce, optimize gain linearity degree.
By adjust the grid voltage of the first NMOS tube NM1 and the second NMOS tube NM2 for changing the first NMOS tube NM1 and
The resistance value of second NMOS tube NM2 is to change the frequency of low phase noise broadband circular type shaker.Using the first transmission
The method that 14 variable resistance of gate cell and first switch capacitor array unit 13 adjust frequency, realizes the low phase noise broadband
The fine tuning and coarse adjustment of circular type shaker frequency.
Fig. 5 is referred to, a kind of low phase noise broadband of low phase noise bandwidth provided in an embodiment of the present invention is shown
The circuit diagram of second level Postponement module in circular type shaker.The electricity of second level Postponement module 2 and first order Postponement module
Line structure is identical.
In the present embodiment, first switch capacitor array unit 13 and second switch capacitor array unit 23 pass through identical
Digital control position is controlled；First transmission gate cell 14 and the second transmission gate cell 24 share identical tuning voltage.
The present invention is big for power consumption present in existing Ring-VCO, and there are contradictions between frequency range and VCO gain, i.e.,
Gain is big when frequency range is big, and gain will increase greatly very much the area of loop filter and deteriorate PLL spurious performance, Yi Jixiang
The problem of position noise difference etc., proposes a kind of low phase noise broadband circular type shaker: providing with latch unit itself
Extra delay makes two-stage Postponement module that can maintain to vibrate, and has saved power consumption；It is formed just by using latch unit
Feedback is to improve oscillator signal in the conversion rate at edge；Since transmission gate cell is located at the logical of power supply and ground to the adjusting of frequency
Except road, circuit can be increased to the anti-interference of power-supply fluctuation using such tuning manner.Meanwhile the present invention is directed to
Contradiction between Ring-VCO tuning range and tuning gain, using switched capacitor array unit and the variable electricity of transmission gate cell
The method that resistance adjusts frequency realizes thin coarse adjustment and the thickness tune of the frequency of low phase noise broadband circular type shaker, this will
Be conducive to reduce VCO tuning gain, and then reduce PLL and export reference spur；In addition, using Low threshold in the design of transmission gate
Device improves the tweak gain linearity of Ring-VCO.The Ring-VCO of broadband low phase noise finally is realized, and is had
There are low tuning gain and high linearity of tuning degree, this is beneficial to the phase noise and polydispersity of the PLL based on Ring-VCO
Energy and loop stability.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of low phase noise broadband circular type shaker, which is characterized in that the low phase noise broadband circular type shaker packet
Include first order Postponement module (1) and second level Postponement module (2)；The first order Postponement module (1) and second level delay
Module (2) forms a loop, is used to provide the described phase shift and increasing required for the circular type shaker starting of oscillation of low phase noise broadband
Benefit；
One of an input terminal (IN1_P) the connection second level Postponement module (2) of the first order Postponement module (1) is defeated
Outlet (OUT2_N)；
Another input terminal (IN1_N) of the first order Postponement module (1) connects the another of the second level Postponement module (2)
A output end (OUT2_P)；
One output end (OUT1_P) of the first order Postponement module (1) connects one of the second level Postponement module (2)
Input terminal (IN2_P)；
The another output (OUT1_N) of the first order Postponement module (1) connects the another of the second level Postponement module (2)
One input terminal (IN2_N)；
The first order Postponement module (1) includes the first input and output inverter module (11), the first latch unit (12), the
One switched capacitor array unit (13) and the first transmission gate cell (14)；
The second level Postponement module (2) includes the second input and output inverter module (21), the second latch unit (22), the
Two switched capacitor array units (23) and the second transmission gate cell (24)；
The first switch capacitor array unit (13) and the second switch capacitor array unit (23) use identical number
Control bit is controlled；
First transmission gate cell (14) and second transmission gate cell (24) share identical tuning voltage.
2. low phase noise broadband according to claim 1 circular type shaker, which is characterized in that first input and output
Inverter module (11) includes the first phase inverter (X1) and the second phase inverter (X2)；First latch unit (12) includes the
Three phase inverters (X3) and the 4th phase inverter (X4)；
The input terminal of first phase inverter (X1) is an input terminal (IN1_P) of the first order Postponement module (1)；
The input terminal of second phase inverter (X2) is another input terminal (IN1_N) of the first order Postponement module (1)；
The input terminal of the third phase inverter (X3) and the output end of the 4th phase inverter (X4) dock, described in the connection of butt end
One end of the output end of first phase inverter (X1) and the first switch capacitor array unit (13)；
The output end of the third phase inverter (X3) and the input terminal of the 4th phase inverter (X4) dock, described in the connection of butt end
The other end of the output end of second phase inverter (X2) and the first switch capacitor array unit (13).
3. low phase noise broadband according to claim 1 circular type shaker, which is characterized in that the first switch capacitor
Array element (13) includes that one or at least two switching capacity branches in parallel, every switching capacity branch are both provided with one
The capacitor equal with two capacitances is switched, and switchs setting between two capacitors；The switching capacity branch passes through number control
Position processed carries out cut-offfing control, to adjust the capacitance of the switching capacity branch output, for the low phase noise broadband
The coarse adjustment of the output frequency of circular type shaker and the division of output band.
4. low phase noise broadband according to claim 1 circular type shaker, which is characterized in that the first transmission gate list
First (14) include the first transmission gate (141) and the second transmission gate (142)；
The input terminal of first transmission gate (141) connects one end of the first switch capacitor array unit (13)；Described
The output end of one transmission gate (141) connects an output end (OUT1_N) of low phase noise broadband circular type shaker；
The input terminal of second transmission gate (142) connects the other end of the first switch capacitor array unit (13), described
The output end of second transmission gate (142) connects the another output (OUT1_ of low phase noise broadband circular type shaker
P)。
5. low phase noise broadband according to claim 4 circular type shaker, which is characterized in that first transmission gate
It (141) include the first PMOS tube (PM1) and the first NMOS tube (NM1)；
The source electrode of first PMOS tube (PM1) is connected with the source electrode of first NMOS tube (NM1)；
The drain electrode of first PMOS tube (PM1) is connected with the drain electrode of first NMOS tube (NM1)；
The grid of first PMOS tube (PM1) is provided with the port (Port1_ of a connection the first ground voltage (VSS1)
VSS)；
The grid of first NMOS tube (NM1) is provided with the port (Port1_ of a connection the first tuning voltage (Vtune1)
Vtune)；
Second transmission gate (142) includes the second PMOS tube (PM2) and the second NMOS tube (NM2)；
The source electrode of second PMOS tube (PM2) is connected with the source electrode of second NMOS tube (NM2)；
The drain electrode of second PMOS tube (PM2) is connected with the drain electrode of second NMOS tube (NM2)；
The grid of second PMOS tube (PM2) is provided with the port (Port2_ of a connection the second ground voltage (VSS2)
VSS)；
The grid of second NMOS tube (NM2) is provided with the port (Port2_ of a connection the second tuning voltage (Vtune2)
Vtune)。
6. low phase noise broadband according to claim 5 circular type shaker, which is characterized in that the port (Port1_
VSS the second ground voltage (VSS2) phase of the first ground voltage (VSS1) and the port (Port2_VSS) connection) connected
Deng；
The first tuning voltage (Vtune1) and the port (Port2_Vtune) of port (Port1_Vtune) connection are even
The second tuning voltage (Vtune2) connect is equal.
7. low phase noise broadband according to claim 5 circular type shaker, which is characterized in that first PMOS tube
(PM1), second PMOS tube (PM2), first NMOS tube (NM1) and second NMOS tube (NM2) are Low threshold device
Part, for improving the tweak gain linearity of low phase noise broadband circular type shaker.
8. low phase noise broadband according to claim 5 circular type shaker, which is characterized in that by adjusting described first
The grid voltage of NMOS tube (NM1) and second NMOS tube (NM2) is for changing first NMOS tube (NM1) and described
The resistance value of two NMOS tubes (NM2) is to change the frequency of low phase noise broadband circular type shaker.
9. low phase noise broadband according to claim 1 circular type shaker, which is characterized in that the first order postpones mould
Block (1) is identical with the circuit structure of the second level Postponement module (2).
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| CN108768389A (en) * | 2018-04-26 | 2018-11-06 | 清华大学 | A kind of multiband two-stage annular voltage controlled oscillator in phaselocked loop |
| CN108768389B (en) * | 2018-04-26 | 2020-06-05 | 清华大学 | Multi-band two-stage annular voltage-controlled oscillator for phase-locked loop |
| CN110365294A (en) * | 2019-06-28 | 2019-10-22 | 西安紫光国芯半导体有限公司 | The frequency expansion method of delay cell, voltage controlled oscillator and voltage controlled oscillator |
| CN110868158A (en) * | 2019-12-09 | 2020-03-06 | 北京富奥星电子技术有限公司 | Miniaturized radio frequency oscillator with wide linear frequency modulation range |
| CN110868158B (en) * | 2019-12-09 | 2023-10-20 | 北京富奥星电子技术有限公司 | Miniaturized radio frequency oscillator with wide linear frequency modulation range |
| WO2022188354A1 (en) * | 2021-03-09 | 2022-09-15 | 长鑫存储技术有限公司 | Interleaved signal generating circuit |
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