CN105207670A - Segmented low-voltage control gain ring oscillator and tuning slope switching circuit - Google Patents
Segmented low-voltage control gain ring oscillator and tuning slope switching circuit Download PDFInfo
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Abstract
The invention discloses a segmented low-voltage control gain ring oscillator. The segmented low-voltage control gain ring oscillator comprises a delay cascade circuit, a tuning slope switching circuit and an oscillation frequency segmented control circuit. The segmented low-voltage control gain ring oscillator is characterized in that the tuning slope switching circuit is used for switching tuning voltage, and the switched tuning voltage is output to the tuning voltage end of the delay cascade circuit so as to adjust delay time of cascade delay units. The oscillation frequency segmented control circuit receives external control signals, current signals of different magnitudes are output according to the external control signals, and the voltage across the tuning voltage end of the delay cascade circuit is adjusted. The delay cascade circuit is composed of the four levels of delay units, the tuning voltage ends of the four levels of delay units are connected together, and the tuning voltage output by the tuning slope switching circuit is received. The tuning slope switching circuit and the oscillation frequency segmented control circuit are combined, and the ring oscillator simultaneously achieves wide frequency covering and low-voltage control gain characteristics, and can be widely applied to a radio frequency phase-locked loop system.
Description
Technical field
The present invention relates to ring oscillator, be specifically related to the low voltage controlled gain ring oscillator of segmentation and tuning slope change-over circuit.
Background technology
Phase-locked loop, as the essential elements in frequency synthesizer and clock generation circuit, is widely used in simulation, numeral and radio frequency chip.LC voltage controlled oscillator or annular voltage controlled oscillator, as the essential elements in phase-locked loop, directly determine phase-lock-ring output frequency scope, export far-end phase noise have a significant impact phase-locked loop.In recent years, consumer electronics to small size, low-power consumption and performance preferably IC product propose requirements at the higher level.
The voltage controlled gain of tradition annular voltage controlled oscillator is higher, can cover wider frequency range, but when being applied in phase-locked loop, to voltage tuning end, the noise ratio of power end is more responsive.More difficultly meet low-power consumption, low cost, high-performance radio-frequency system requirements.
Summary of the invention
Technical problem to be solved by this invention is to provide the low voltage controlled gain ring oscillator of segmentation and tuning slope change-over circuit.
The present invention is in order to solve the problems of the technologies described above, and first technical scheme of the present invention is:
The low voltage controlled gain ring oscillator of a kind of segmentation, comprises and postpones cascade circuit, tuning slope change-over circuit and frequency of oscillation sectional control circuit; It is characterized in that:
Described tuning slope change-over circuit is used for changing tuning voltage, the tuning voltage after conversion is outputted to the tuning voltage end postponing cascade circuit, to regulate the time of delay of cascaded delay;
Described frequency of oscillation sectional control circuit receives external control signal, exports the current signal of different size according to external control signal, regulates the tuning voltage terminal voltage postponing cascade circuit;
Described delay cascade circuit is made up of level Four delay cell, and first three grade of delay cell output plus terminal is connected to the negative input end of next stage delay cell, and first three grade of delay cell exports the positive input terminal that negative terminal is connected to next stage delay cell; Fourth stage delay cell output plus terminal is connected to the positive input terminal of first order delay cell, and fourth stage delay cell exports the negative input end that negative terminal is connected to first order delay cell; The tuning voltage of level Four delay cell terminates at together, receives the tuning voltage that tuning slope change-over circuit exports.
The present invention adopts level Four delay cell cascade looping oscillator vibrates source, and level Four delay cell all adopts identical circuit to realize, and can realize difference output or orthogonal output two kinds of output modes.The tuning voltage of level Four delay cell terminates at together, by changing tuning voltage terminal voltage, can change every one-level delay units delay time size, thus realizes the control to frequency of oscillation.Utilize first order delay cell positive-negative output end and third level delay cell positive-negative output end, get final product output orthogonal oscillator signal; Equally, utilize second level delay cell positive-negative output end and fourth stage delay cell positive-negative output end, also can output orthogonal oscillator signal; Any one-level positive-negative output end of level Four delay cell is differential signal, can export difference oscillator signal.
The present invention adopts tuning slope change-over circuit to realize low voltage controlled gain.Namely by adopting tuning slope change-over circuit, the voltage change range of input vt_in can be converted from ground to supply voltage to the narrower tuning voltage of voltage change range and add tuning voltage end vt_out, then realize the control to the delay units delay time by tuning voltage end vt_out, the low voltage controlled gain namely achieving ring oscillator controls.
Adopt frequency of oscillation sectional control circuit to change the voltage of level Four delay cascade circuit tuning voltage end, realize the discrete control to frequency of oscillation.The discrete control of frequency of oscillation combined with the continuous control of tuning slope change-over circuit to frequency of oscillation, the wide frequency of oscillation that can realize ring oscillator covers.
According to the preferred version of the low voltage controlled gain ring oscillator of segmentation of the present invention, described tuning slope change-over circuit comprises operational amplifier, PMOS MP1, MP2, NMOS tube MN1 and resistance R2, R3; The grid of PMOS MP1, MP2 links together, and is connected with operational amplifier output terminal; The source electrode of PMOS MP1, MP2 is connected together; The drain electrode of PMOS MP1 connects operational amplifier negative input end, and by resistance R2 ground connection; The drain electrode of PMOS MP2 connects the drain and gate of NMOS tube MN1 by resistance R3.
According to the preferred version of the low voltage controlled gain ring oscillator of segmentation of the present invention, comprise N road current source in described frequency of oscillation sectional control circuit, N gets positive integer; N road current source is made up of N-1 road controllable current source and a Lu Changkai current source; N-1 road controllable current source is connected described tuning slope change-over circuit with the output of a Lu Changkai current source simultaneously, namely the current signal of different size is exported according to external control signal, the tuning voltage that tuning slope change-over circuit exports is regulated, namely the tuning voltage terminal voltage postponing cascade circuit is regulated; N-1 road controllable current source controls break-make by external segmentation control signal.
According to the preferred version of the low voltage controlled gain ring oscillator of segmentation of the present invention, controllable current source and Chang Kai current source are formed by two PMOS, and wherein, the source electrode of the first PMOS connects power supply, the base stage received current signal of the first PMOS; The drain electrode of the first PMOS connects with the source electrode of the second PMOS, and the drain electrode of the second PMOS connects described tuning slope change-over circuit, regulates the tuning voltage that tuning slope change-over circuit exports; Form the grounded-grid of the second PMOS often opened in two PMOS of current source; The grid forming the second PMOS in two PMOS of controllable current source receives external segmentation control signal.
According to the preferred version of the low voltage controlled gain ring oscillator of segmentation of the present invention, in described frequency of oscillation sectional control circuit, comprise Lu Silu controllable current source and a Lu Changkai current source; Described frequency of oscillation sectional control circuit comprises NMOS tube MN2, MN3 and PMOS MP3 ~ MP13; The grid of NMOS tube MN3 pipe is connected with drain electrode, is current input terminal, MN3 pipe source ground VSS; The grid of NMOS tube MN2, MN3 is interconnected, the source ground of NMOS tube MN2, MN3, and NMOS tube MN2 drain electrode connects with the grid of PMOS MP13 and drain electrode; The grid of PMOS MP3, MP5, MP7, MP9, MP11 is connected with the grid of MP13, and the source electrode of PMOS MP3, MP5, MP7, MP9, MP11, MP13 connects power supply; The drain electrode of PMOS MP11 connects with the source electrode of PMOS MP12, the drain electrode of PMOS MP9 connects with the source electrode of PMOS MP10, the drain electrode of PMOS MP7 connects with the source electrode of PMOS MP8, the drain electrode of PMOS MP5 connects with the source electrode of PMOS MP6, and the drain electrode of PMOS MP3 connects with the source electrode of PMOS MP4; The grounded-grid of PMOS MP4, the grid of PMOS MP12, MP10, MP8 and MP6 receives external control signal respectively; The drain electrode of PMOS MP12, MP10, MP8, MP6 and MP4 links together, and connects described tuning slope change-over circuit, namely exports the current signal of different size according to external control signal, regulates the tuning voltage that tuning slope change-over circuit exports.
Second technical scheme of the present invention is: the tuning slope change-over circuit forming the low voltage controlled gain ring oscillator of segmentation, is characterized in that: described tuning slope change-over circuit comprises operational amplifier, PMOS MP1, MP2, NMOS tube MN1 and resistance R2, R3; The grid of PMOS MP1, MP2 links together, and is connected with operational amplifier output terminal; The source electrode of PMOS MP1, MP2 is connected together; The drain electrode of PMOS MP1 connects operational amplifier negative input end, and by resistance R2 ground connection; The drain electrode of PMOS MP2 connects the drain and gate of NMOS tube MN1 by resistance R3.
The beneficial effect of the low voltage controlled gain ring oscillator of segmentation of the present invention and tuning slope change-over circuit is: the present invention is combined by tuning slope change-over circuit and frequency of oscillation sectional control circuit, make ring oscillator have broadband to cover and low voltage controlled gain characteristic simultaneously, difference output or orthogonal output two kinds of output modes can be realized; The present invention, compared with traditional high voltage controlled gain ring oscillator, has little, the low in energy consumption and better advantage of closed loop phase noise characteristic of area, can be widely used in RF Phase-Lock Loop system.
Accompanying drawing explanation
Fig. 1 is segmentation low voltage controlled 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 the conversion of tuning slope change-over circuit slope realizes design sketch.
Fig. 6 is that frequency of oscillation sectional control circuit realizes design sketch.
Embodiment
See Fig. 1, the low voltage controlled gain ring oscillator of a kind of segmentation, comprises and postpones cascade circuit 1, tuning slope change-over circuit 2 and frequency of oscillation sectional control circuit 3; Wherein:
Tuning voltage after conversion, for changing tuning voltage, is outputted to the tuning voltage end postponing cascade circuit, to regulate the time of delay of cascaded delay by described tuning slope change-over circuit 2;
Described frequency of oscillation sectional control circuit 3 receives external control signal, exports the current signal of different size according to external control signal, regulates the tuning voltage terminal voltage postponing cascade circuit 1;
Described delay cascade circuit 1 is made up of level Four delay cell, and first three grade of delay cell output plus terminal is connected to the negative input end of next stage delay cell, and first three grade of delay cell exports the positive input terminal that negative terminal is connected to next stage delay cell; Fourth stage delay cell output plus terminal is connected to the positive input terminal of first order delay cell, and fourth stage delay cell exports the negative input end that negative terminal is connected to first order delay cell; The tuning voltage of level Four delay cell terminates at together, receives the tuning voltage that tuning slope change-over circuit 2 exports simultaneously.By changing the tuning voltage end vt_out voltage postponing cascade circuit, every one-level delay units delay time size can be changed, thus realize the control to frequency of oscillation.Utilize first order delay cell positive-negative output end and third level delay cell positive-negative output end, get final product output orthogonal oscillator signal; Equally, utilize second level delay cell positive-negative output end and fourth stage delay cell positive-negative output end, also can output orthogonal oscillator signal; Any one-level positive-negative output end of level Four delay cell is differential signal, can export difference oscillator signal.
See Fig. 2, each delay cell is formed by three NMOS tube MN10, MN11, MN12 and two resistance R11, R12.MN10 source ground VSS, grid is tuning voltage end vt_out, and drain electrode connects with the source electrode of MN11, MN12; The grid of MN11 is the input anode of delay cell, and drain electrode connects one end of electricity group R11; The grid of MN12 is the input negative terminal of delay cell, one end of drain electrode connecting resistance R12; Resistance R11 and MN11 drain electrode connects, and is the negative output terminal of delay cell; Resistance R12 and MN12 drain electrode connects, and is the positive output end of delay cell; An other termination power VCC of resistance R11 and resistance R12.Regulate MN10 grid voltage, can regulate and flow through MN10 electric current, thus regulate the electric current of each delay cell, play the control lag time, realize the function of frequency tuning.
Tuning slope change-over circuit 2 is made up of operational amplifier OAMP, a PMOS MP1, MP2, NMOS tube MN1, resistance R1, R2, R3 and electric capacity C1, and detailed circuit is shown in Fig. 3.The grid of PMOS MP1, MP2 links together, and is connected with operational amplifier output terminal; The source electrode of PMOS MP1, MP2 connects power supply; The drain electrode of PMOS MP1 connects operational amplifier negative input end, and by resistance R2 ground connection; The drain electrode of PMOS MP2 connects the drain and gate of NMOS tube MN1 by resistance R3; The drain and gate of NMOS tube MN1 is connected together, the tuning voltage end vt_out of connection delay cascade circuit; Resistance R1 and electric capacity C1 is connected in series, the output of a termination operational amplifier OAMP after being connected in series, another termination operational amplifier OAMP negative input end; The positive input terminal of operational amplifier OAMP is tuning voltage input vt_in.
The operation principle of tuning slope change-over circuit 2 is: operational amplifier OAMP positive input terminal is tuning voltage input vt_in, due to negative feedback, amplifier OAMP negative input end can follow positive input terminal change, and the electric current flowing through resistance R2 like this can be followed the change of R2 two ends pressure reduction and change.Grid, the source electrode of MP1 pipe and MP2 pipe are connected together respectively, when MP2 pipe and MP1 pipe are all operated in saturation region, the ratio flowing through MP1 tube current and flow through between MP2 tube current is identical with the ratio between MP1 pipe breadth length ratio and MP2 pipe breadth length ratio, once MP1 pipe breadth length ratio and MP2 pipe breadth length ratio are determined, this ratio is fixed ratio, and this working region is Linear Tuning region; After the drain voltage of MP1 pipe is higher than MP1 tube grid voltage threshold voltage, MP1 pipe enters linear zone, flow through and become on-fixed ratio relation between MP1 tube current and the electric current flowing through MP2 pipe, tuning voltage scope corresponding to this region is narrower, is non-linear tuning region.By increasing the value of resistance R2, the excursion of vt_out voltage can be reduced, playing the function reducing ring oscillator voltage controlled gain.Be raised in too high process at tuning voltage vt_in, due to the Following effect of amplifier, the drain voltage of MP1 pipe also and then raises, MP1 pipe can enter linear zone from saturation region, in this course, flow through MP2 electric current and there will be sudden change, if the NMOS tube that the drain electrode of MP2 is directly connected with diode connects, tuning voltage can be caused very not linear.The linear characteristic that resistance R3 effectively can promote tuning voltage vt_out is added between the NMOS tube MN1 pipe drain-gate be connected with diode by draining at MP2 pipe.
Tuning slope change-over circuit 2 realizes effect as shown in Figure 5, and transverse axis is tuning voltage before conversion, and the longitudinal axis is tuning voltage after conversion, and the voltage change range that after conversion, vt_out holds is far below the voltage change range of vt_in end before conversion.Fig. 5 shows, the tuning slope change-over circuit successful that the present invention proposes.
See Fig. 4, comprise N road current source in described frequency of oscillation sectional control circuit 3, N gets positive integer; N road current source is made up of N-1 road controllable current source and a Lu Changkai current source; N-1 road controllable current source is connected described tuning slope change-over circuit with the output of a Lu Changkai current source simultaneously, regulates the tuning voltage that tuning slope change-over circuit exports; N-1 road controllable current source controls break-make by external segmentation control signal.
Wherein, controllable current source and Chang Kai current source are formed by two PMOS, and wherein, the source electrode of the first PMOS connects power supply, the base stage received current signal of the first PMOS; The drain electrode of the first PMOS connects with the source electrode of the second PMOS, and the drain electrode of the second PMOS connects described tuning slope change-over circuit, regulates the tuning voltage that tuning slope change-over circuit exports; Form the grounded-grid of the second PMOS often opened in two PMOS of current source; The grid forming the second PMOS in two PMOS of controllable current source receives external segmentation control signal.
In a particular embodiment, Lu Silu controllable current source and a Lu Changkai current source is comprised in described frequency of oscillation sectional control circuit; Described frequency of oscillation sectional control circuit comprises NMOS tube MN2, MN3 and PMOS MP3 ~ MP13; The grid of NMOS tube MN3 pipe is connected with drain electrode, is current input terminal, MN3 pipe source ground VSS; The grid of NMOS tube MN2, MN3 is interconnected, the source ground of NMOS tube MN2, MN3, and NMOS tube MN2 drain electrode connects with the grid of PMOS MP13 and drain electrode; The grid of PMOS MP3, MP5, MP7, MP9, MP11 is connected with the grid of MP13, and the source electrode of PMOS MP3, MP5, MP7, MP9, MP11, MP13 connects power supply; The drain electrode of PMOS MP11 connects with the source electrode of PMOS MP12, the drain electrode of PMOS MP9 connects with the source electrode of PMOS MP10, the drain electrode of PMOS MP7 connects with the source electrode of PMOS MP8, the drain electrode of PMOS MP5 connects with the source electrode of PMOS MP6, and the drain electrode of PMOS MP3 connects with the source electrode of PMOS MP4; The grounded-grid of PMOS MP4, the grid of PMOS MP12, MP10, MP8 and MP6, namely B<0>, B<1>, B<2> and B<3> end, receives external segmentation control signal respectively; The drain electrode of PMOS MP12, MP10, MP8, MP6 and MP4 links together, and connect described tuning slope change-over circuit, namely be connected to the drain and gate of the NMOS tube MN1 of tuning slope change-over circuit, the tuning voltage that tuning slope change-over circuit exports is regulated.
The operation principle of described frequency of oscillation sectional control circuit 3 is: often open current source in described frequency of oscillation sectional control circuit, can solve input tuning voltage closely current potential time ring oscillator not starting of oscillation problem.Controllable current source directly can change to flow through in tuning slope change-over circuit and flows through voltage between MN1 pipe drain-source, realizes the controllable adjustment to tuning voltage end vt_out voltage.MP11 and MP12, MP9 and MP10, MP7 and MP8, MP5 and MP6 form four road controllable current sources, by the height of control MP12, MP10, MP8, MP6 grid voltage, can realize the shutoff to four road electric currents and conducting; MP3 and MP4 formation often opens current source.There is current copy relation in MN3 and MN2, MP13 pipe and MP11 manages, MP9 manages, MP7 manages, MP5 manages, there is current copy relation between MP3 pipe, flowing through MN2 pipe drain-source current identical with flowing through MP13 pipe drain-source current, flowing through MP11 pipe, MP9 pipe, MP7 pipe, MP5 pipe, MP3 tube current like this and flowing through between MN3 pipe fixed current source Idc1 and there is proportionate relationship.
B<0>, B<1>, B<2>, B<3> end is used for that controls MP12 manages, MP10 pipe, MP8 manage, the conducting of MP6 pipe or cut-off respectively, during conducting, electric current is had to flow into port vt_out; During cut-off, no current flows into port vt_out.The current weights that B<0>, B<1>, B<2>, B<3> control is respectively I, 2*I, 4*I, 8*I.Like this, the Linear Control to flowing through vt_out end electric current can be realized.When B<0>, B<1>, B<2>, B<3> level is high, corresponding MP12 manages, MP10 pipe, MP8 pipe, MP6 pipe all end, and only has MP3 to manage and MP4 tube current inflow vt_out end.Vt_out end whether is flowed into by B<0>, B<1>, B<2>, B<3> control I, 2*I, 4*I, 8*I weight electric current, namely the control to MN1 pipe drain-source current is achieved, thus the control realized MN1 tube grid voltage, namely realize directly controlling vt_out terminal voltage, also namely achieve the discrete control to cascaded delay size time of delay.Like this, 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 tuning voltage to frequency of oscillation Discrete control implementation result, and the longitudinal axis is frequency of oscillation.Fig. 6 shows: the frequency of oscillation sectional control circuit that the present invention proposes can realize the Discrete control of ring oscillator frequency of oscillation.
See Fig. 3, form the tuning slope change-over circuit of the low voltage controlled gain ring oscillator of segmentation, be made up of operational amplifier OAMP, a PMOS MP1, MP2, NMOS tube MN1, resistance R1, R2, R3 and electric capacity C1, detailed circuit is shown in Fig. 3.The grid of PMOS MP1, MP2 links together, and is connected with operational amplifier output terminal; The source electrode of PMOS MP1, MP2 connects power supply; The drain electrode of PMOS MP1 connects operational amplifier negative input end, and by resistance R2 ground connection; The drain electrode of PMOS MP2 connects the drain and gate of NMOS tube MN1 by resistance R3; The drain and gate of NMOS tube MN1 is connected together, the tuning voltage end vt_out of connection delay cascade circuit; Resistance R1 and electric capacity C1 is connected in series, the output of a termination operational amplifier OAMP after being connected in series, another termination operational amplifier OAMP negative input end; The positive input terminal of operational amplifier OAMP is tuning voltage input vt_in.
Result of implementation above shows: a kind of segmentation of the present invention low voltage controlled gain ring oscillator has the feature such as low voltage controlled gain and frequency of oscillation Discrete control simultaneously.The technology of the present invention can be applied in small size, low-power consumption, high performance RF Phase-Lock Loop system.
Claims (6)
1. the low voltage controlled gain ring oscillator of segmentation, comprises and postpones cascade circuit (1), tuning slope change-over circuit (2) and frequency of oscillation sectional control circuit (3); It is characterized in that:
Described tuning slope change-over circuit (2) is for changing tuning voltage, tuning voltage after conversion is outputted to the tuning voltage end postponing cascade circuit (1), to regulate the time of delay of cascaded delay, play the effect reducing voltage controlled gain;
Described frequency of oscillation sectional control circuit (3) receives external control signal, exports the current signal of different size according to external control signal, regulates the tuning voltage terminal voltage postponing cascade circuit (1);
Described delay cascade circuit (1) is made up of level Four delay cell, and first three grade of delay cell output plus terminal is connected to the negative input end of next stage delay cell, and first three grade of delay cell exports the positive input terminal that negative terminal is connected to next stage delay cell; Fourth stage delay cell output plus terminal is connected to the positive input terminal of first order delay cell, and fourth stage delay cell exports the negative input end that negative terminal is connected to first order delay cell; The tuning voltage of level Four delay cell terminates at together, receives the tuning voltage that tuning slope change-over circuit (2) exports simultaneously.
2. the low voltage controlled gain ring oscillator of segmentation according to claim 1, is characterized in that: described tuning slope change-over circuit (2) comprises operational amplifier, PMOS MP1, MP2, NMOS tube MN1 and resistance R2, R3; The grid of PMOS MP1, MP2 links together, and is connected with operational amplifier output terminal; The source electrode of PMOS MP1, MP2 is connected together; The drain electrode of PMOS MP1 connects operational amplifier negative input end, and by resistance R2 ground connection; The drain electrode of PMOS MP2 connects the drain and gate of NMOS tube MN1 by resistance R3.
3. the low voltage controlled gain ring oscillator of segmentation according to claim 1 and 2, is characterized in that: comprise N road current source in described frequency of oscillation sectional control circuit (3), N gets positive integer; N road current source is made up of N-1 road controllable current source and a Lu Changkai current source; N-1 road controllable current source is connected described tuning slope change-over circuit with the output of a Lu Changkai current source simultaneously, regulates the tuning voltage that tuning slope change-over circuit exports; N-1 road controllable current source controls break-make by external segmentation control signal.
4. the low voltage controlled gain ring oscillator of segmentation according to claim 3, is characterized in that: controllable current source and Chang Kai current source are formed by two PMOS, and wherein, the source electrode of the first PMOS connects power supply, the base stage received current signal of the first PMOS; The drain electrode of the first PMOS connects with the source electrode of the second PMOS, and the drain electrode of the second PMOS connects described tuning slope change-over circuit, regulates the tuning voltage that tuning slope change-over circuit exports; Form the grounded-grid of the second PMOS often opened in two PMOS of current source; The grid forming the second PMOS in two PMOS of controllable current source receives external segmentation control signal.
5. the low voltage controlled gain ring oscillator of segmentation according to claim 4, is characterized in that: comprise Lu Silu controllable current source and a Lu Changkai current source in described frequency of oscillation sectional control circuit; Described frequency of oscillation sectional control circuit comprises NMOS tube MN2, MN3 and PMOS MP3 ~ MP13; The grid of NMOS tube MN3 pipe is connected with drain electrode, is current input terminal, MN3 pipe source ground VSS; The grid of NMOS tube MN2, MN3 is interconnected, the source ground of NMOS tube MN2, MN3, and NMOS tube MN2 drain electrode connects with the grid of PMOS MP13 and drain electrode; The grid of PMOS MP3, MP5, MP7, MP9, MP11 is connected with the grid of MP13, and the source electrode of PMOS MP3, MP5, MP7, MP9, MP11, MP13 connects power supply; The drain electrode of PMOS MP11 connects with the source electrode of PMOS MP12, the drain electrode of PMOS MP9 connects with the source electrode of PMOS MP10, the drain electrode of PMOS MP7 connects with the source electrode of PMOS MP8, the drain electrode of PMOS MP5 connects with the source electrode of PMOS MP6, and the drain electrode of PMOS MP3 connects with the source electrode of PMOS MP4; The grounded-grid of PMOS MP4, the grid of PMOS MP12, MP10, MP8 and MP6 receives external segmentation control signal respectively; The drain electrode of PMOS MP12, MP10, MP8, MP6 and MP4 links together, and connects described tuning slope change-over circuit, regulates the tuning voltage that tuning slope change-over circuit exports.
6. form the tuning slope change-over circuit of the low voltage controlled gain ring oscillator of segmentation, it is characterized in that: described tuning slope change-over circuit comprises operational amplifier, PMOS MP1, MP2, NMOS tube MN1 and resistance R2, R3; The grid of PMOS MP1, MP2 links together, and is connected with operational amplifier output terminal; The source electrode of PMOS MP1, MP2 is connected together; The drain electrode of PMOS MP1 connects operational amplifier negative input end, and by resistance R2 ground connection; The drain electrode of PMOS MP2 connects the drain and gate of NMOS tube MN1 by resistance R3.
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| CN108429540A (en) * | 2018-02-11 | 2018-08-21 | 东南大学 | A kind of high-resolution digit phase generator of low-power consumption |
| CN108429540B (en) * | 2018-02-11 | 2021-06-15 | 东南大学 | Digital phase generator with low power consumption and high resolution |
| CN110557103A (en) * | 2018-06-04 | 2019-12-10 | 深圳指芯智能科技有限公司 | oscillating circuit |
| CN109639270A (en) * | 2018-12-07 | 2019-04-16 | 上海安路信息科技有限公司 | A kind of voltage-controlled oscillator circuit |
| CN110460308A (en) * | 2019-08-15 | 2019-11-15 | 电子科技大学 | A kind of ring voltage-controlled oscillator circuit of wide scope |
| CN110460308B (en) * | 2019-08-15 | 2023-03-24 | 电子科技大学 | Wide-range annular voltage-controlled oscillator circuit |
| 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 |
| CN113364458A (en) * | 2021-06-08 | 2021-09-07 | 南京邮电大学 | Numerically controlled oscillator circuit with high frequency resolution |
| 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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