CN105207670B - It is segmented low pressure control gain ring oscillator and tuning slope change-over circuit - Google Patents
It is segmented low pressure control gain ring oscillator and tuning slope change-over circuit Download PDFInfo
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Abstract
The invention discloses segmentation low pressure control gain ring oscillator, including delay cascade circuit, tuning slope change-over circuit and frequency of oscillation sectional control circuit；It is characterized in that：The tuning slope change-over circuit is used to change VT, the VT after conversion is output to the VT end of delay cascade circuit, to adjust the time delay of cascaded delay；The frequency of oscillation sectional control circuit receives external control signal, exports different size of current signal according to external control signal, the VT terminal voltage for postponing cascade circuit is adjusted；The delay cascade circuit is made up of level Four delay cell, and the VT termination of level Four delay cell receives the VT of tuning slope change-over circuit output together；The present invention is combined by tuning slope change-over circuit and frequency of oscillation sectional control circuit, makes ring oscillator while has broadband covering and low pressure control gain characteristic, can be widely used in RF Phase-Lock Loop system.
Description
Technical field
The present invention relates to ring oscillator, and in particular to segmentation low pressure control gain ring oscillator and tuning slope conversion electricity
Road.
Background technology
Phaselocked loop as the essential elements in frequency synthesizer and clock generation circuit, be widely used in simulation, numeral and
In radio frequency chip.LC voltage controlled oscillators or annular voltage controlled oscillator directly determine phaselocked loop as the essential elements in phaselocked loop
Reference frequency output, have a significant impact to phaselocked loop output distal end phase noise.In recent years, consumer electronics were to small area, low work(
Consume and performance preferably IC products propose requirements at the higher level.
The voltage controlled gain of traditional annular voltage controlled oscillator is higher, can cover wider frequency range, but applies in lock phase
When in ring, to voltage tuning end, the noise of power end is more sensitive.It is more difficult to meet low-power consumption, low cost, high-performance radio-frequency system
Demand.
The content of the invention
The technical problems to be solved by the invention are that providing segmentation low pressure control gain ring oscillator and tuning slope turns
Change circuit.
In order to solve the above-mentioned technical problem, of the invention first technical scheme is the present invention：
One kind segmentation low pressure control gain ring oscillator, including delay cascade circuit, tuning slope change-over circuit and vibration
Frequency segmentation control circuit；It is characterized in that：
The tuning slope change-over circuit is used to change VT, and the VT after conversion is output to and prolonged
The VT end of slow cascade circuit, to adjust the time delay of cascaded delay；
The frequency of oscillation sectional control circuit receives external control signal, and different size is exported according to external control signal
Current signal, to postpone cascade circuit VT terminal voltage be adjusted；
The delay cascade circuit is made up of level Four delay cell, and preceding three-level delay cell output plus terminal is connected to next stage
The negative input end of delay cell, preceding three-level delay cell output negative terminal are connected to the positive input terminal of next stage delay cell；4th
Level delay cell output plus terminal is connected to the positive input terminal of first order delay cell, and fourth stage delay cell output negative terminal is connected to
The negative input end of first order delay cell；The VT termination of level Four delay cell together, receives tuning slope conversion electricity
The VT of road output.
The present invention forms ring oscillator oscillation source using the cascade of level Four delay cell, and level Four delay cell is using identical
Circuit realize, it is possible to achieve two kinds of output modes of difference output or orthogonal output.The VT end of level Four delay cell
It is connected together, by changing VT terminal voltage, thus it is possible to vary per one-level delay units delay time size, so as to realize pair
The control of frequency of oscillation.Utilize first order delay cell positive-negative output end and third level delay cell positive-negative output end, you can defeated
Go out quadrature oscillator signal；Equally, using second level delay cell positive-negative output end and fourth stage delay cell positive-negative output end,
Quadrature oscillator signal can be exported；Any one-level positive-negative output end of level Four delay cell is differential signal, can be with output difference
Divide oscillator signal.
The present invention realizes low voltage controlled gain using tuning slope change-over circuit.Electricity is changed by using tuning slope
Road, input vt_in voltage change range can be converted into the narrower tuning of voltage change range from ground to supply voltage
Voltage adds VT end vt_out, then realizes the control to the delay units delay time by VT end vt_out
System, that is, realize the low pressure control gain control of ring oscillator.
Change the voltage of level Four delay cascade circuit tuning voltage end, realization pair using frequency of oscillation sectional control circuit
The discrete control of frequency of oscillation.By the discrete control of frequency of oscillation and continuous control of the tuning slope change-over circuit to frequency of oscillation
It is combined, it is possible to achieve the wide frequency of oscillation covering of ring oscillator.
According to the preferred scheme of segmentation low pressure control gain ring oscillator of the present invention, the tuning slope conversion electricity
Road includes operational amplifier, PMOS MP1, MP2, NMOS tube MN1 and resistance R2, R3；The grid of PMOS MP1, MP2 is connected to
Together, and with operational amplifier output terminal it is connected；The source electrode of PMOS MP1, MP2 is connected together；PMOS MP1 drain electrode
Operational amplifier negative input end is connect, and is grounded by resistance R2；PMOS MP2 drain electrode passes through resistance R3 connection NMOS tubes MN1
Drain and gate.
According to the preferred scheme of segmentation low pressure control gain ring oscillator of the present invention, the frequency of oscillation segmentation control
N roads current source is included in circuit processed, N takes positive integer；N roads current source normally opened current source structure by N-1 roads controllable current source and all the way
Into；N-1 roads controllable current source and all the way output of normally opened current source connect the tuning slope change-over circuit simultaneously, i.e., according to outer
Portion's control signal exports different size of current signal, the VT of tuning slope change-over circuit output is adjusted, i.e.,
The VT terminal voltage for postponing cascade circuit is adjusted；N-1 roads controllable current source is controlled by external segmentation control signal
Break-make.
According to the preferred scheme of segmentation low pressure control gain ring oscillator of the present invention, controllable current source and normally opened electricity
Stream source is formed by two PMOSs, wherein, the source electrode of the first PMOS connects power supply, and the base stage of the first PMOS receives electric current letter
Number；The drain electrode of first PMOS connects with the source electrode of the second PMOS, and the drain electrode of the second PMOS connects the tuning slope and turned
Circuit is changed, the VT of tuning slope change-over circuit output is adjusted；In two PMOSs for forming normally opened current source
The second PMOS grounded-grid；The grid for forming the second PMOS in two PMOSs of controllable current source receives outside
Discrete control signal.
According to the preferred scheme of segmentation low pressure control gain ring oscillator of the present invention, the frequency of oscillation segmentation control
Lu Silu controllable current sources and all the way normally opened current source are included in circuit processed；The frequency of oscillation sectional control circuit includes NMOS
Pipe MN2, MN3 and PMOS MP3~MP13；The grids of NMOS tube MN3 pipes and drain electrode connect, and are current input terminal, MN3 pipe source electrodes
It is grounded VSS；The grid of NMOS tube MN2, MN3 is connected with each other, the source ground of NMOS tube MN2, MN3, NMOS tube MN2 drain electrodes with
PMOS MP13 grid and drain electrode connect；PMOS MP3, MP5, MP7, MP9, MP11 grid are connected with MP13 grid
Connect, PMOS MP3, MP5, MP7, MP9, MP11, MP13 source electrode connect power supply；PMOS MP11 drain electrode is with PMOS MP12's
Source electrode connects, and PMOS MP9 drain electrode connects with PMOS MP10 source electrode, PMOS MP7 drain electrode and PMOS MP8 source
Pole connects, and PMOS MP5 drain electrode connects with PMOS MP6 source electrode, PMOS MP3 drain electrode and PMOS MP4 source electrode
Connect；PMOS MP4 grounded-grid, PMOS MP12, MP10, MP8 and MP6 grid receive external control signal respectively；
PMOS MP12, MP10, MP8, MP6 and MP4 drain electrode link together, and connect the tuning slope change-over circuit, i.e. root
Different size of current signal is exported according to external control signal, the VT of tuning slope change-over circuit output is adjusted
Section.
The present invention second technical scheme be：Form the tuning slope conversion electricity of segmentation low pressure control gain ring oscillator
Road, it is characterised in that：The tuning slope change-over circuit includes operational amplifier, PMOS MP1, MP2, NMOS tube MN1 and electricity
Hinder R2, R3；The grid of PMOS MP1, MP2 links together, and is connected with operational amplifier output terminal；PMOS MP1, MP2
Source electrode be connected together；PMOS MP1 drain electrode connects operational amplifier negative input end, and is grounded by resistance R2；PMOS
The drain and gate that pipe MP2 drain electrode passes through resistance R3 connection NMOS tubes MN1.
Segmentation low pressure control gain ring oscillator of the present invention and the beneficial effect of tuning slope change-over circuit are：This
Invention is combined by tuning slope change-over circuit and frequency of oscillation sectional control circuit, makes ring oscillator while has wideband
Rate covers and low pressure control gain characteristic, it is possible to achieve two kinds of output modes of difference output or orthogonal output；It is of the invention and traditional
High voltage-controlled increasing benefit loop, addedlink loop, gaining loop shape oscillator is compared, and has the advantages of area is small, low in energy consumption and closed loop phase noise characteristic is more preferable, can be extensive
Apply in RF Phase-Lock Loop system.
Brief description of the drawings
Fig. 1 is segmentation low pressure control gain ring oscillator scheme block diagram.
Fig. 2 is delay unit circuit figure.
Fig. 3 is the circuit diagram of tuning slope change-over circuit.
Fig. 4 is the circuit diagram of frequency of oscillation sectional control circuit.
Fig. 5 is that design sketch is realized in the conversion of tuning slope change-over circuit slope.
Fig. 6 is that frequency of oscillation sectional control circuit realizes design sketch.
Embodiment
Referring to Fig. 1, one kind segmentation low pressure control gain ring oscillator, including delay cascade circuit 1, tuning slope conversion electricity
Road 2 and frequency of oscillation sectional control circuit 3；Wherein：
The tuning slope change-over circuit 2 is used to change VT, and the VT after conversion is output to
Postpone the VT end of cascade circuit, to adjust the time delay of cascaded delay；
The frequency of oscillation sectional control circuit 3 receives external control signal, is exported according to external control signal different big
Small current signal, the VT terminal voltage for postponing cascade circuit 1 is adjusted；
The delay cascade circuit 1 is made up of level Four delay cell, and preceding three-level delay cell output plus terminal is connected to next
The negative input end of level delay cell, preceding three-level delay cell output negative terminal are connected to the positive input terminal of next stage delay cell；The
Level Four delay cell output plus terminal is connected to the positive input terminal of first order delay cell, the output negative terminal connection of fourth stage delay cell
In the negative input end of first order delay cell；The VT termination of level Four delay cell together, while receives tuning slope
The VT that change-over circuit 2 exports.By the VT end vt_out voltages for changing delay cascade circuit, thus it is possible to vary every
One-level delay units delay time size, so as to realize the control to frequency of oscillation.Utilize the positive negative output of first order delay cell
End and third level delay cell positive-negative output end, you can output quadrature oscillator signal；Equally, it is positive and negative using second level delay cell
Output end and fourth stage delay cell positive-negative output end, can also export quadrature oscillator signal；Level Four delay cell it is any one
Level positive-negative output end is differential signal, can be with output difference oscillator signal.
Referring to Fig. 2, each delay cell is by three NMOS tubes MN10, MN11, MN12 and two resistance R11, R12 structures
Into.MN10 source ground VSS, grid are VT end vt_out, and drain electrode connects with MN11, MN12 source electrode；MN11 grid
The extremely input positive terminal of delay cell, drain electrode connect electricity group R11 one end；MN12 grid is the input negative terminal of delay cell, is leaked
Pole connecting resistance R12 one end；Resistance R11 connects with MN11 drain electrodes, is the negative output terminal of delay cell；Resistance R12 and MN12 leaks
Pole connects, and is the positive output end of delay cell；Resistance R11 and resistance R12 other end meet power supply VCC.Adjust MN10 grids
Voltage, it can adjust and flow through MN10 electric currents, so as to adjust the electric current of each delay cell, play regulation time delay, realize frequency
The function of rate tuning.
Tuning slope change-over circuit 2 by an operational amplifier OAMP, PMOS MP1, MP2, NMOS tube MN1, resistance R1,
R2, R3 and electric capacity C1 are formed, and detailed circuit is shown in Fig. 3.The grid of PMOS MP1, MP2 links together, and and operational amplifier
Output end connects；The source electrode of PMOS MP1, MP2 connects power supply；PMOS MP1 drain electrode connects operational amplifier negative input end, and leads to
Cross resistance R2 ground connection；The drain and gate that PMOS MP2 drain electrode passes through resistance R3 connection NMOS tubes MN1；NMOS tube MN1 leakage
Pole and grid are connected together, the VT end vt_out of connection delay cascade circuit；Resistance R1 and electric capacity C1 are connected in series, string
The latter termination operational amplifier OAMP of connection connection output end, another termination operational amplifier OAMP negative input ends；Operation amplifier
Device OAMP positive input terminal is VT input vt_in.
The operation principle of tuning slope change-over circuit 2 is：Operational amplifier OAMP positive input terminals are VT input
Vt_in, due to negative feedback, amplifier OAMP negative input ends can follow positive input terminal to change, and so flow through resistance R2 electric current
The change of R2 both ends pressure difference can be followed and changed.MP1 is managed and grid, the source electrode of MP2 pipes are connected together respectively, as MP2 pipes and MP1
When Guan Jun is operated in saturation region, the ratio for flowing through MP1 tube currents and flowing through between MP2 tube currents is managed with MP1 pipes breadth length ratio and MP2
Ratio between breadth length ratio is identical, once MP1 pipes breadth length ratio and MP2 pipes breadth length ratio determine that the ratio is fixed ratio, this
Working region is Linear Tuning region；After the drain voltage of MP1 pipes is higher than MP1 tube grids one threshold voltage of voltage, MP1
Pipe enters linear zone, flows through MP1 tube currents and flows through and is changed into on-fixed ratio relation between the electric current of MP2 pipes, the region pair
The VT scope answered is narrower, is non-linear tuning region.By increasing resistance R2 value, vt_out voltages can be reduced
Excursion, play the function of reducing ring oscillator voltage controlled gain.VT vt_in be raised to it is too high during, due to
The Following effect of amplifier, the drain voltage of MP1 pipes also and then raise, and MP1 pipes can enter linear zone from saturation region, in this process
In, flow through MP2 electric currents and mutation occurs, if the NMOS tube that MP2 drain electrode is directly connected with diode connects, can cause to tune
Voltage is not very linear.By between the NMOS tube MN1 pipe drain-gates that connects with diode of MP2 pipes drain electrode addition resistance R3 can have
Effect lifting VT vt_out linear characteristic.
Tuning slope change-over circuit 2 realizes effect as shown in Figure 5, and transverse axis is VT before conversion, after the longitudinal axis is conversion
VT, voltage change range of the voltage change range at vt_out ends far below vt_in ends before conversion after conversion.Fig. 5 tables
It is bright, tuning slope change-over circuit positive effect proposed by the present invention.
Referring to Fig. 4, N roads current source is included in the frequency of oscillation sectional control circuit 3, N takes positive integer；N roads current source
Normally opened current source is formed by N-1 roads controllable current source and all the way；The output of N-1 roads controllable current source and all the way normally opened current source is same
When connect the tuning slope change-over circuit, to tuning slope change-over circuit output VT be adjusted；N-1 roads are controllable
Current source controls break-make by external segmentation control signal.
Wherein, controllable current source and normally opened current source are formed by two PMOSs, wherein, the source electrode of the first PMOS connects
Power supply, the base stage of the first PMOS receive current signal；The drain electrode of first PMOS connects with the source electrode of the second PMOS, and second
The drain electrode of PMOS connects the tuning slope change-over circuit, and the VT of tuning slope change-over circuit output is adjusted
Section；Form the grounded-grid of the second PMOS in two PMOSs of normally opened current source；Form two of controllable current source
The grid of the second PMOS in PMOS receives external segmentation control signal.
In a particular embodiment, comprising Lu Silu controllable current sources and normal all the way in the frequency of oscillation sectional control circuit
Open current source；The frequency of oscillation sectional control circuit includes NMOS tube MN2, MN3 and PMOS MP3~MP13；NMOS tube MN3
The grid of pipe and drain electrode connect, and are current input terminal, MN3 pipe source grounds VSS；The grid of NMOS tube MN2, MN3 is connected with each other,
The source ground of NMOS tube MN2, MN3, NMOS tube MN2 drain electrodes connect with PMOS MP13 grid and drain electrode；PMOS MP3,
MP5, MP7, MP9, MP11 grid are connected with MP13 grid, PMOS MP3, MP5, MP7, MP9, MP11, MP13 source
Pole connects power supply；PMOS MP11 drain electrode connects with PMOS MP12 source electrode, and PMOS MP9 drain electrode is with PMOS MP10's
Source electrode connects, and PMOS MP7 drain electrode connects with PMOS MP8 source electrode, PMOS MP5 drain electrode and PMOS MP6 source
Pole connects, and PMOS MP3 drain electrode connects with PMOS MP4 source electrode；PMOS MP4 grounded-grid, PMOS MP12,
MP10, MP8 and MP6 grid, i.e. B<0>、B<1>、B<2>And B<3>End, external segmentation control signal is received respectively；PMOS
MP12, MP10, MP8, MP6 and MP4 drain electrode link together, and connect the tuning slope change-over circuit, are attached to tune
The NMOS tube MN1 of humorous slope change-over circuit drain and gate, the VT of tuning slope change-over circuit output is adjusted
Section.
The operation principle of the frequency of oscillation sectional control circuit 3 is：It is normal in the frequency of oscillation sectional control circuit
Current source is opened, can solve the problems, such as to input VT close to ring oscillator not starting of oscillation during ground potential.Controllable current source can be with
Directly change to flow through and voltage between MN1 pipe drain-sources is flowed through in tuning slope change-over circuit, realize to tuning voltage end vt_out voltages
Controllable adjustment.MP11 forms four road controllable current sources with MP12, MP9 and MP10, MP7 and MP8, MP5 and MP6, passes through control
The height of MP12, MP10, MP8, MP6 grid voltage, it is possible to achieve four road electric currents are switched off and on；MP3 and MP4 forms normal
Open current source.There is current copy relation in MN3 and MN2, between MP13 pipes and MP11 pipes, MP9 pipes, MP7 pipes, MP5 pipes, MP3 pipes
Current copy relation be present, it is identical with flowing through MP13 pipe drain-source currents to flow through MN2 pipes drain-source current, so flows through MP11 pipes, MP9
Pipe, MP7 pipes, MP5 pipes, MP3 tube currents and flow through between MN3 pipe fixed current sources Idc1 and proportionate relationship be present.
B<0>、B<1>、B<2>、B<3>End is respectively intended to control MP12 pipes, MP10 pipes, MP8 pipes, MP6 pipe on or off,
During conducting, there is electric current to flow into port vt_out；During cut-off, no current flows into port vt_out.B<0>、B<1>、B<2>、B<3>Control
The current weights of system are respectively I, 2*I, 4*I, 8*I.In this manner it is achieved that the Linear Control to flowing through vt_out ends electric current.Work as B
<0>、B<1>、B<2>、B<3>When level is high, corresponding MP12 pipes, MP10 pipes, MP8 pipes, MP6 pipes are turned off, only MP3
Pipe and MP4 tube currents flow into vt_out ends.Pass through B<0>、B<1>、B<2>、B<3>To control I, 2*I, 4*I, 8*I weight electric current
Vt_out ends whether are flowed into, that is, realize the control to MN1 pipe drain-source currents, so as to realize the control to MN1 tube grid voltages,
Realize and vt_out terminal voltages are directly controlled, namely realize the discrete control to cascaded delay time delay size.
So, B<0>、B<1>、B<2>、B<3>Control bit just serves the function of Discrete control ring oscillator frequency of oscillation.
As shown in Figure 6, transverse axis is VT to frequency of oscillation Discrete control implementation result, and the longitudinal axis is frequency of oscillation.Fig. 6 tables
It is bright：Frequency of oscillation sectional control circuit proposed by the present invention can realize the Discrete control of ring oscillator frequency of oscillation.
Referring to Fig. 3, the tuning slope change-over circuit for being segmented low pressure control gain ring oscillator is formed, by an operation amplifier
Device OAMP, PMOS MP1, MP2, NMOS tube MN1, resistance R1, R2, R3 and electric capacity C1 are formed, and detailed circuit is shown in Fig. 3.PMOS
MP1, MP2 grid link together, and are connected with operational amplifier output terminal；The source electrode connection power supply of PMOS MP1, MP2；
PMOS MP1 drain electrode connects operational amplifier negative input end, and is grounded by resistance R2；PMOS MP2 drain electrode passes through resistance
R3 connection NMOS tubes MN1 drain and gate；NMOS tube MN1 drain and gate is connected together, connection delay cascade circuit
VT end vt_out；Resistance R1 and electric capacity C1 are connected in series, and are connected in series latter termination operational amplifier OAMP output
End, another termination operational amplifier OAMP negative input ends；Operational amplifier OAMP positive input terminal is VT input vt_
in。
Result of implementation above shows：A kind of segmentation low pressure control gain ring oscillator of the present invention has low pressure control simultaneously
The features such as gain and frequency of oscillation Discrete control.The technology of the present invention may apply to small area, low-power consumption, high performance radio-frequency lock
In phase loop system.
Claims (5)
1. one kind segmentation low pressure control gain ring oscillator, including delay cascade circuit (1), tuning slope change-over circuit (2) and
Frequency of oscillation sectional control circuit (3)；It is characterized in that：
The tuning slope change-over circuit (2) is used to change VT, and the VT after conversion is output to and prolonged
The VT end of slow cascade circuit (1), to adjust the time delay of cascaded delay, play the work for reducing voltage controlled gain
With；
The frequency of oscillation sectional control circuit (3) receives external control signal, and different size is exported according to external control signal
Current signal, to delay cascade circuit (1) VT terminal voltage be adjusted；
The delay cascade circuit (1) is made up of level Four delay cell, and preceding three-level delay cell output plus terminal is connected to next stage
The negative input end of delay cell, preceding three-level delay cell output negative terminal are connected to the positive input terminal of next stage delay cell；4th
Level delay cell output plus terminal is connected to the positive input terminal of first order delay cell, and fourth stage delay cell output negative terminal is connected to
The negative input end of first order delay cell；The VT termination of level Four delay cell together, while receives tuning slope and turned
Change the VT of circuit (2) output；
N roads current source is included in the frequency of oscillation sectional control circuit (3), N takes positive integer；N roads current source is controllable by N-1 roads
Current source and all the way normally opened current source composition；N-1 roads controllable current source and all the way output of normally opened current source connect simultaneously described in
Tuning slope change-over circuit, the VT of tuning slope change-over circuit output is adjusted；N-1 roads controllable current source is by outer
Segment section control signal controls break-make.
2. segmentation low pressure control gain ring oscillator according to claim 1, it is characterised in that：The tuning slope conversion
Circuit (2) includes operational amplifier, PMOS MP1, MP2, NMOS tube MN1 and resistance R2, R3；The grid of PMOS MP1, MP2
Link together, and be connected with operational amplifier output terminal；The source electrode of PMOS MP1, MP2 is connected together；PMOS MP1
Drain electrode connect operational amplifier negative input end, and be grounded by resistance R2；PMOS MP2 drain electrode passes through resistance R3 connections NMOS
Pipe MN1 drain and gate.
3. segmentation low pressure control gain ring oscillator according to claim 1 or 2, it is characterised in that：Controllable current source and
Normally opened current source is formed by two PMOSs, wherein, the source electrode of the first PMOS connects power supply, and the base stage of the first PMOS receives
Current signal；The drain electrode of first PMOS connects with the source electrode of the second PMOS, and the drain electrode of the second PMOS connects the tuning
Slope change-over circuit, the VT of tuning slope change-over circuit output is adjusted；Form two of normally opened current source
The grounded-grid of the second PMOS in PMOS；Form the grid of the second PMOS in two PMOSs of controllable current source
Receive external segmentation control signal.
4. segmentation low pressure control gain ring oscillator according to claim 3, it is characterised in that：The frequency of oscillation segmentation
Lu Silu controllable current sources and all the way normally opened current source are included in control circuit；The frequency of oscillation sectional control circuit includes
NMOS tube MN2, MN3 and PMOS MP3~MP13；The grid of NMOS tube MN3 pipes and drain electrode are connected, and are current input terminal, and MN3 is managed
Source ground VSS；The grid of NMOS tube MN2, MN3 is connected with each other, the source ground of NMOS tube MN2, MN3, NMOS tube MN2 drain electrodes
Connect with PMOS MP13 grid and drain electrode；PMOS MP3, MP5, MP7, MP9, MP11 grid are connected with MP13 grid
Connect, PMOS MP3, MP5, MP7, MP9, MP11, MP13 source electrode connect power supply；PMOS MP11 drain electrode is with PMOS MP12's
Source electrode connects, and PMOS MP9 drain electrode connects with PMOS MP10 source electrode, PMOS MP7 drain electrode and PMOS MP8 source
Pole connects, and PMOS MP5 drain electrode connects with PMOS MP6 source electrode, PMOS MP3 drain electrode and PMOS MP4 source electrode
Connect；PMOS MP4 grounded-grid, PMOS MP12, MP10, MP8 and MP6 grid receive external segmentation control letter respectively
Number；PMOS MP12, MP10, MP8, MP6 and MP4 drain electrode link together, and connect the tuning slope change-over circuit, right
The VT of tuning slope change-over circuit output is adjusted.
5. form the tuning slope change-over circuit of segmentation low pressure control gain ring oscillator, it is characterised in that：The tuning slope
Change-over circuit includes operational amplifier, PMOS MP1, MP2, NMOS tube MN1 and resistance R2, R3；The grid of PMOS MP1, MP2
Link together, and be connected with operational amplifier output terminal；The source electrode of PMOS MP1, MP2 is connected together；PMOS MP1
Drain electrode connect operational amplifier negative input end, and be grounded by resistance R2；PMOS MP2 drain electrode passes through resistance R3 connections NMOS
Pipe MN1 drain and gate.
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| CN106603012B (en) * | 2016-12-09 | 2020-06-30 | 重庆西南集成电路设计有限责任公司 | Broadband temperature compensation voltage-controlled oscillator, temperature compensation method and voltage generation circuit |
| CN108429540B (en) * | 2018-02-11 | 2021-06-15 | 东南大学 | Digital phase generator with low power consumption and high resolution |
| CN110557103B (en) * | 2018-06-04 | 2024-07-30 | 江西指芯智能科技有限公司 | Oscillating circuit |
| CN109639270B (en) * | 2018-12-07 | 2021-07-20 | 上海安路信息科技股份有限公司 | Voltage controlled oscillator circuit |
| CN110460308B (en) * | 2019-08-15 | 2023-03-24 | 电子科技大学 | Wide-range annular voltage-controlled oscillator circuit |
| 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 |
| CN113364458B (en) * | 2021-06-08 | 2022-09-16 | 南京邮电大学 | Numerically controlled oscillator circuit with high frequency resolution |
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| CN102723912A (en) * | 2012-04-12 | 2012-10-10 | 杭州电子科技大学 | Broadband annular oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723912A (en) * | 2012-04-12 | 2012-10-10 | 杭州电子科技大学 | Broadband annular oscillator |
| CN104836575A (en) * | 2014-02-07 | 2015-08-12 | 无锡华润上华半导体有限公司 | Phase adjustable frequency oscillator used for phase detecting circuit |
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