CN117544116A - Noise circulation oscillator with wide frequency range - Google Patents
Noise circulation oscillator with wide frequency range Download PDFInfo
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- CN117544116A CN117544116A CN202311642721.8A CN202311642721A CN117544116A CN 117544116 A CN117544116 A CN 117544116A CN 202311642721 A CN202311642721 A CN 202311642721A CN 117544116 A CN117544116 A CN 117544116A
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- transistor
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- band oscillator
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- 239000003990 capacitor Substances 0.000 claims abstract description 77
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 5
- 230000001939 inductive effect Effects 0.000 claims description 17
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000006880 cross-coupling reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
- H03K19/018557—Coupling arrangements; Impedance matching circuits
Abstract
The invention discloses a wide-frequency-range noise cyclic oscillator, which comprises an upper frequency band oscillator and a lower frequency band oscillator which are of the same topology, wherein the upper frequency band oscillator and the lower frequency band oscillator are coupled, the resonant frequencies of the upper frequency band oscillator and the lower frequency band oscillator are different, the upper frequency band oscillator comprises a first active core circuit, a first LC resonant circuit and a first switch capacitor array which are mutually connected in parallel, and the lower frequency band oscillator comprises a second active core circuit, a second LC resonant circuit and a second switch capacitor array which are mutually connected in parallel. The invention can realize wide frequency tuning and low phase noise simultaneously by noise circulation technology and the coupling of the upper and lower frequency band oscillators.
Description
Technical Field
The invention relates to the technical field of microelectronics, in particular to a noise circulating oscillator with a wide frequency range.
Background
Voltage-controlled oscillators (VCOs) are important components in electronic circuit design, and have wide applications in the fields of wireless communication, radio frequency signal generation, clock signal generation, and the like. Designing a voltage-controlled oscillator needs to comprehensively consider a plurality of factors such as frequency range, tuning performance, noise performance, power consumption and the like so as to meet the requirements of different application fields. Currently, maintaining low phase noise in voltage controlled oscillators over a wide frequency tuning range is a significant challenge.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a noise circulating oscillator with a wide frequency range so as to solve the problem that a voltage-controlled oscillator is difficult to maintain low phase noise in a wide frequency tuning range.
In order to solve the technical problems, the invention is realized by adopting the following scheme:
the invention provides a wide-frequency-range noise cyclic oscillator, which comprises an upper frequency band oscillator and a lower frequency band oscillator which are of the same topology, wherein the upper frequency band oscillator and the lower frequency band oscillator are coupled, the upper frequency band oscillator and the lower frequency band oscillator are different in resonance frequency, the upper frequency band oscillator comprises a first active core circuit, a first LC resonant circuit and a first switch capacitor array which are mutually connected in parallel, and the lower frequency band oscillator comprises a second active core circuit, a second LC resonant circuit and a second switch capacitor array which are mutually connected in parallel.
Further, the first active core circuit comprises a first transistor (101), a second transistor (103), a third transistor (105) and a fourth transistor (107), wherein the grid electrode and the source electrode of the first transistor (101) are respectively connected with the grid electrode of the fourth transistor (107) and the source electrode of the third transistor (105), the grid electrode and the source electrode of the second transistor (103) are respectively connected with the grid electrode of the third transistor (105) and the source electrode of the fourth transistor (107), the source electrodes of the first transistor (101) and the third transistor (105) are connected with one inductive load end of an upper-frequency band oscillator, the source electrodes of the second transistor (103) and the fourth transistor (107) are connected with the inductive load end of the other lower-frequency band oscillator, the drain electrodes of the first transistor (101) and the drain electrodes of the second transistor (103) are respectively connected with power supply voltages, the source electrodes of the first transistor (101) and the third transistor (105) are respectively connected with the source electrodes of the second transistor (103) and the fourth transistor (107), the first transistor (101) and the drain electrodes of the second transistor (103) are connected with the drain electrodes of the fourth transistor (107), and the common drain electrodes of the second transistor (103) and the fourth transistor (107) are connected with the common drain electrode (105) to form a cross coupling structure, and the common-mode circuit is formed.
Further, the second active core circuit includes a fifth transistor (111), a sixth transistor (113), a seventh transistor (115) and an eighth transistor (117), wherein a gate and a source of the fifth transistor (111) are respectively connected with a gate of the eighth transistor (117) and a source of the seventh transistor (115), a gate and a source of the sixth transistor (113) are respectively connected with a gate of the seventh transistor (115) and a source of the eighth transistor (117), a source of the fifth transistor (111) and a source of the seventh transistor (115) are connected with an inductive load end of one path of the upper band oscillator, a source of the sixth transistor (113) and a source of the eighth transistor (117) are connected with an inductive load end of the other path of the lower band oscillator, a drain of the fifth transistor (111) and a drain of the sixth transistor (113) are respectively connected with a power supply voltage, a source of the fifth transistor (111) and a source of the seventh transistor (115) are respectively connected with a source of the sixth transistor (113) and a source of the eighth transistor (117), the fifth transistor (111) and the sixth transistor (113) and the drain of the eighth transistor (117) form a cross-coupled structure, and the common drain and the eighth transistor (117) form a cross-coupled structure.
Further, the first LC resonant circuit comprises a third transistor (105), a fourth transistor (107), a first variable capacitor (401), a second variable capacitor (402) and a first capacitor (400), the third transistor (105) and the fourth transistor (107) are in cross coupling, the first variable capacitor (401) and the second variable capacitor (402) are connected in series and are connected with the first capacitor (400) in parallel to form a first parallel circuit, one end of the first parallel circuit is connected with an output VCON end, the other end of the first parallel circuit is connected with an output VCOP end, and the middle of the first variable capacitor (401) and the middle of the second variable capacitor (402) are connected with a control voltage Vc.
Further, the second LC resonant circuit includes a seventh transistor (115), an eighth transistor (117), a third variable capacitor (411), a fourth variable capacitor (412) and a second capacitor (410), the seventh transistor (115) and the eighth transistor (117) are cross-coupled, the third variable capacitor (411) and the fourth variable capacitor (412) are connected in series and are connected in parallel with the second capacitor (410) to form a second parallel circuit, one end of the second parallel circuit is connected with an output VCON end, the other end is connected with an output VCOP end, and a control voltage Vc is connected between the third variable capacitor (411) and the fourth variable capacitor (412).
Further, the inductive load end of the upper frequency band oscillator comprises a first inductor (201), a second inductor (202), a fifth resistor (301) and a sixth resistor (302), the first inductor (201), the second inductor (202), the fifth resistor (301) and the sixth resistor (302) form a circuit bias load, one end of the first inductor (201) is connected with one end of the fifth resistor (301), the other end of the first inductor is connected with the source electrode of the first transistor (101) and the source electrode of the third transistor (105), one end of the second inductor (202) is connected with one end of the sixth resistor (302), the other end of the second inductor is connected with the source electrode of the second transistor (103) and the source electrode of the fourth transistor (107), and the other end of the fifth resistor (301) is connected with the other end of the sixth resistor (302) and grounded.
Further, the inductance load end of the lower band oscillator comprises a third inductance (211), a fourth inductance (212), a seventh resistance (311) and an eighth resistance (312), the third inductance (211), the fourth inductance (212), the seventh resistance (311) and the eighth resistance (312) form a circuit bias load, one end of the third inductance (211) is connected with one end of the seventh resistance (311), the other end is connected with sources of the fifth transistor (111) and the seventh transistor (115), one end of the fourth inductance (212) is connected with one end of the eighth resistance (312), the other end is connected with sources of the sixth transistor (113) and the eighth transistor (117), and the other end of the seventh resistance (311) is connected with the other end of the eighth resistance (312) and grounded.
Further, the upper band oscillator and the lower band oscillator are coupled through a transformer, and the coupling coefficient is K.
Compared with the prior art, the invention has the beneficial effects that: the invention can realize wide frequency tuning and low phase noise simultaneously by the noise circulation technology and the upper and lower frequency band oscillators.
Drawings
Fig. 1 is a circuit diagram of a wide frequency range noise cyclic oscillator according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a noise circulation oscillator according to an embodiment of the present invention;
description of the embodiments
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
As shown in fig. 1 and 2, the present embodiment provides a wide frequency range noise cyclic oscillator, which includes an upper frequency band oscillator and a lower frequency band oscillator of the same topology; the upper band oscillator and the lower band oscillator are coupled; the upper band oscillator and the lower band oscillator have different resonant frequencies; the upper band oscillator comprises a first active core circuit, a first LC resonance circuit and a first switch capacitor array which are mutually connected in parallel, and the lower band oscillator comprises a second active core circuit, a second LC resonance circuit and a second switch capacitor array which are mutually connected in parallel.
The first active core circuit is composed of MOS transistors, and a negative resistance circuit is realized. The first active core circuit includes a transistor 101, a transistor 103, a transistor 105, and a transistor 107. Wherein, the gate and the source of the transistor 101 are respectively connected with the gate of the transistor 107 and the source of the transistor 105, and the gate and the source of the transistor 103 are respectively connected with the gate of the transistor 105 and the source of the transistor 107; sources of the transistor 101 and the transistor 105 are connected with the left inductive load end, and sources of the transistor 103 and the transistor 107 are connected with the right inductive load end; drains of the transistor 101 and the transistor 103 are connected to a power supply voltage, respectively; sources of the transistor 101 and the transistor 105 are connected to sources of the transistor 103 and the transistor 107, the transistor 101 and the transistor 103 form a common drain, the transistor 105 and the transistor 107 form a cross-coupling circuit, and the common drain and the cross-coupling circuit form a noise circulation structure.
The inductive load side of the upper band oscillator includes an inductance 201, an inductance 202, a resistance 301, and a resistance 302, the inductance 201, the inductance 202, the resistance 301, and the resistance 302 forming a circuit bias load. One end of the inductor 201 is connected to one end of the resistor 301, the other end is connected to sources of the transistor 101 and the transistor 105, one end of the inductor 202 is connected to one end of the resistor 302, the other end is connected to sources of the transistor 103 and the transistor 107, and the other end of the resistor 301 is connected to the other end of the resistor 302 and grounded.
The first LC resonant circuit is guaranteed to oscillate by a circuit consisting of capacitance, inductance and cross-coupling tubes. The first LC resonant circuit includes transistor 105, transistor 107, variable capacitance 401, variable capacitance 402, and capacitance 400. The NMOS transistor 105 and the NMOS transistor 107 are cross-coupled, negative resistance is realized, energy loss in a resonant circuit is compensated, the upper frequency band oscillator can work normally, and the drains of the transistor 105 and the transistor 107 are the output of the upper frequency band oscillator; the variable capacitor 401 and the variable capacitor 402 are connected in series and are connected in parallel with the capacitor 400 to form a parallel circuit, one end of the parallel circuit is connected with the output VCON end, the other end of the parallel circuit is connected with the output VCOP end, the control voltage Vc is connected between the variable capacitor 401 and the variable capacitor 402, and the capacitance values of the variable capacitor 401 and the variable capacitor 402 are controlled through Vc.
The first switched capacitor array 600 is used to change the frequency band of the upper band oscillator in conjunction with the variable capacitors 401, 402, and includes a transistor 605, a capacitor 601, a capacitor 602, a resistor 603, and a resistor 604. The transistor 605 is connected between the capacitor 601 and the capacitor 602, the gate of the transistor 605 is connected to receive an external control signal, the capacitor 601 is connected to the source of the transistor 605, the capacitor 602 is connected to the drain of the transistor 605, and the resistor 603 and the resistor 604 are connected between the source and the drain of the transistor 605. When the gate logic value of transistor 605 is 1, transistor 605 is turned on and forms a connection between capacitors 601 and 602, and first switched capacitor array 600 is turned on; when the gate logic value of transistor 605 is 0, transistor 605 is turned off to disconnect between capacitors 601 and 602 and turn off first switched capacitor array 600.
The second active core circuit is constituted by MOS transistors, implementing a negative resistance circuit, including a transistor 111, a transistor 113, a transistor 115, and a transistor 117. Wherein, the gate and the source of the transistor 111 are respectively connected with the gate of the transistor 117 and the source of the transistor 115, and the gate and the source of the transistor 113 are respectively connected with the gate of the transistor 115 and the source of the transistor 117; sources of the transistor 111 and the transistor 115 are connected to the left inductive load terminal, and sources of the transistor 113 and the transistor 117 are connected to the right inductive load terminal; drains of the transistor 111 and the transistor 113 are connected to a power supply voltage, respectively; sources of the transistor 111 and the transistor 115 are connected to sources of the transistor 113 and the transistor 117, the transistor 111 and the transistor 113 form a common drain, the transistor 115 and the transistor 117 form a cross-coupling circuit, and the common drain and the cross-coupling circuit constitute a noise circulation structure.
The inductive load side of the lower band oscillator includes an inductance 211, an inductance 212, a resistance 311, and a resistance 312, the inductance 211, the inductance 212, the resistance 311, and the resistance 312 forming a circuit bias load. One end of the inductor 211 is connected to one end of the resistor 311, the other end is connected to sources of the transistor 111 and the transistor 115, one end of the inductor 212 is connected to one end of the resistor 312, the other end is connected to sources of the transistor 113 and the transistor 117, and the other end of the resistor 311 is connected to the other end of the resistor 312 and grounded.
The second LC resonant circuit is ensured to oscillate by a circuit consisting of a capacitor, an inductor and cross-coupled tubes. The second LC resonant circuit includes transistor 115, transistor 117, variable capacitance 411, variable capacitance 412, and capacitance 410. The NMOS transistor 115 and the NMOS transistor 117 are cross-coupled to realize negative resistance, compensate energy loss in the resonant circuit, ensure that the lower band oscillator can work normally, and drain electrodes of the transistor 115 and the transistor 117 are outputs of the lower band oscillator; the variable capacitor 411 and the variable capacitor 412 are connected in series and are connected in parallel with the capacitor 410 to form a parallel circuit, one end of the parallel circuit is connected with the output VCON end, the other end of the parallel circuit is connected with the output VCOP end, the middle of the variable capacitor 411 and the variable capacitor 412 is connected with the control voltage Vc, and the capacitance values of the variable capacitor 411 and the variable capacitor 412 are controlled through Vc.
The second switched capacitor array 610 is used to change the frequency band of the lower band oscillator together with the variable capacitors 411, 412. Since the upper band oscillator and the lower band oscillator are of the same topology, the specific structure of the second switched capacitor array 610 refers to the first switched capacitor array 600 in fig. 2, and thus the illustration is omitted.
The inductance-capacitance ratio of the circuit can be adjusted, i.e., the frequency of the oscillator can be changed, by adjusting the respective capacitance values of the upper band oscillator and the lower band oscillator (i.e., the capacitance values of the variable capacitor 401, variable capacitor 402, variable capacitor 411, and variable capacitor 412). The upper frequency band oscillator and the lower frequency band oscillator are coupled through a transformer, and the coupling coefficient is K. The upper band oscillator operates in a first frequency range using the external control signal 605 to the transistor 605 in the first switched capacitor array 600 1 ～605 n Control implementation; the lower band oscillator operates in a second frequency range with the transistor 615 in the second switched capacitor array 610 being subject to an external control signal 615 1 ～615 n Control implementation; wherein the first frequency range is different from the second frequency range.
In summary, the wide-frequency-range noise circulation oscillator of the present invention can realize wide-frequency tuning and low-phase noise simultaneously by noise circulation technology and coupling of the upper and lower frequency-band oscillators.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (8)
1. A wide frequency range noise cyclic oscillator, comprising an upper frequency band oscillator and a lower frequency band oscillator of the same topology, the upper frequency band oscillator and the lower frequency band oscillator being coupled, the upper frequency band oscillator and the lower frequency band oscillator having different resonant frequencies, the upper frequency band oscillator comprising a first active core circuit, a first LC resonant circuit, and a first switched capacitor array in parallel with each other, the lower frequency band oscillator comprising a second active core circuit, a second LC resonant circuit, and a second switched capacitor array in parallel with each other.
2. The wide frequency range noise circulating oscillator according to claim 1, wherein the first active core circuit comprises a first transistor (101), a second transistor (103), a third transistor (105) and a fourth transistor (107), the gate and the source of the first transistor (101) are respectively connected to the gate of the fourth transistor (107) and the source of the third transistor (105), the gate and the source of the second transistor (103) are respectively connected to the gate of the third transistor (105) and the source of the fourth transistor (107), the source of the first transistor (101) and the source of the third transistor (105) are connected to an inductive load end of one path of the upper band oscillator, the source of the second transistor (103) and the source of the fourth transistor (107) are connected to an inductive load end of the other path of the lower band oscillator, the drain of the first transistor (101) and the drain of the second transistor (103) are respectively connected to a power supply voltage, the source of the first transistor (101) and the source of the second transistor (103) are respectively connected to the source of the fourth transistor (107), the drain of the second transistor (103) and the drain of the fourth transistor (103) are respectively connected to the source of the fourth transistor (107), the first transistor (101) and the drain of the fourth transistor (107) are coupled together, and the common drain of the second transistor (101) are coupled together, and the common drain of the common source (107) forms a cross-coupled structure.
3. The wide frequency range noise circulating oscillator according to claim 1, wherein the second active core circuit comprises a fifth transistor (111), a sixth transistor (113), a seventh transistor (115) and an eighth transistor (117), the gate and the source of the fifth transistor (111) are respectively connected to the gate of the eighth transistor (117) and the source of the seventh transistor (115), the gate and the source of the sixth transistor (113) are respectively connected to the gate of the seventh transistor (115) and the source of the eighth transistor (117), the source of the fifth transistor (111) and the source of the seventh transistor (115) are connected to an inductive load terminal of one path of the upper band oscillator, the source of the sixth transistor (113) and the source of the eighth transistor (117) are connected to an inductive load terminal of the other path of the lower band oscillator, the drain of the fifth transistor (111) and the drain of the sixth transistor (113) are respectively connected to a power supply voltage, the source of the fifth transistor (111) and the source of the seventh transistor (115) are respectively connected to the gate of the sixth transistor (113) and the source of the eighth transistor (117), the fifth transistor (111) and the drain of the eighth transistor (117) are connected to the source of the fifth transistor (113) and the drain of the eighth transistor (117) are respectively, the common coupling structure is formed, and the common drain (drain and the common coupling structure is formed.
4. The wide frequency range noise circulating oscillator according to claim 1, characterized in that the first LC resonant circuit comprises a third transistor (105), a fourth transistor (107), a first variable capacitor (401), a second variable capacitor (402) and a first capacitor (400), the third transistor (105) and the fourth transistor (107) are cross-coupled, the first variable capacitor (401) and the second variable capacitor (402) are connected in series and are connected in parallel with the first capacitor (400) to form a first parallel circuit, one end of the first parallel circuit is connected to an output VCON terminal, the other end is connected to an output VCOP terminal, and the first variable capacitor (401) and the second variable capacitor (402) are connected in intermediate connection with a control voltage Vc.
5. The wide frequency range noise circulating oscillator according to claim 1, characterized in that the second LC resonant circuit comprises a seventh transistor (115), an eighth transistor (117), a third variable capacitor (411), a fourth variable capacitor (412) and a second capacitor (410), the seventh transistor (115) and the eighth transistor (117) are cross-coupled, the third variable capacitor (411) and the fourth variable capacitor (412) are connected in series and are connected in parallel with the second capacitor (410) to form a second parallel circuit, one end of the second parallel circuit is connected to an output VCON terminal, the other end is connected to an output VCOP terminal, and the third variable capacitor (411) and the fourth variable capacitor (412) are connected in intermediate to a control voltage Vc.
6. The wide frequency range noise circulating oscillator according to claim 2, wherein the inductive load end of the upper frequency band oscillator comprises a first inductor (201), a second inductor (202), a fifth resistor (301) and a sixth resistor (302), the first inductor (201), the second inductor (202), the fifth resistor (301) and the sixth resistor (302) form a circuit bias load, one end of the first inductor (201) is connected with one end of the fifth resistor (301), the other end is connected with sources of the first transistor (101) and the third transistor (105), one end of the second inductor (202) is connected with one end of the sixth resistor (302), the other end is connected with sources of the second transistor (103) and the fourth transistor (107), and the other end of the fifth resistor (301) is connected with the other end of the sixth resistor (302) and grounded.
7. A wide frequency range noise circulating oscillator according to claim 3, characterized in that the inductive load end of the lower frequency band oscillator comprises a third inductor (211), a fourth inductor (212), a seventh resistor (311) and an eighth resistor (312), the third inductor (211), the fourth inductor (212), the seventh resistor (311) and the eighth resistor (312) form a circuit bias load, one end of the third inductor (211) is connected with one end of the seventh resistor (311), the other end is connected with sources of the fifth transistor (111) and the seventh transistor (115), one end of the fourth inductor (212) is connected with one end of the eighth resistor (312), the other end is connected with sources of the sixth transistor (113) and the eighth transistor (117), and the other end of the seventh resistor (311) is connected with the other end of the eighth resistor (312) and grounded.
8. The wide frequency range noise circulating oscillator of claim 1, wherein the upper band oscillator and the lower band oscillator are coupled by a transformer, the coupling coefficient being K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311642721.8A CN117544116A (en) | 2023-12-04 | 2023-12-04 | Noise circulation oscillator with wide frequency range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311642721.8A CN117544116A (en) | 2023-12-04 | 2023-12-04 | Noise circulation oscillator with wide frequency range |
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| CN117544116A true CN117544116A (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311642721.8A Pending CN117544116A (en) | 2023-12-04 | 2023-12-04 | Noise circulation oscillator with wide frequency range |
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| Country | Link |
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| CN (1) | CN117544116A (en) |
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- 2023-12-04 CN CN202311642721.8A patent/CN117544116A/en active Pending
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