CN210273972U - Quadrature voltage-controlled oscillator circuit with phase shift - Google Patents
Quadrature voltage-controlled oscillator circuit with phase shift Download PDFInfo
- Publication number
- CN210273972U CN210273972U CN201822255748.2U CN201822255748U CN210273972U CN 210273972 U CN210273972 U CN 210273972U CN 201822255748 U CN201822255748 U CN 201822255748U CN 210273972 U CN210273972 U CN 210273972U
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- transistor
- controlled oscillator
- node
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
The utility model provides a quadrature voltage-controlled oscillator circuit with phase shift, which comprises two voltage-controlled oscillators with the same structure, wherein the two voltage-controlled oscillators are connected with each other through an input/output port, and each of the two voltage-controlled oscillators comprises a cross coupling oscillation circuit, an injection locking circuit, a resonance circuit and a voltage-controlled current source circuit which are electrically connected with each other; the signal is injected through the injection locking circuit and coupled with the oscillation circuit, thereby outputting a quadrature signal. The utility model discloses a simple circuit structure can make the oscillator work in a mode steadily, can provide good phase shift for resonant circuit in lower frequency channel, improves the tuning range of oscillator simultaneously to do not increase phase noise.
Description
Technical Field
The utility model relates to a quadrature voltage controlled oscillator field, concretely relates to quadrature voltage controlled oscillator circuit from area phase shift.
Background
Modern wireless transceiver requires quadrature oscillation signals to be mixed for up-conversion and down-conversion, generally, in order to generate quadrature signals, one of the most popular methods is to use an injection-locked LC cross-coupling structure to generate quadrature signals, and meanwhile, in order to avoid the quality factor reduction of varactors in a resonant loop, a variety of frequency adjustment techniques for varactors are derived, but a conventional injection-locked quadrature oscillator introduces two operation modes due to the uncertainty of the direction of the injection signals, the two modes exist symmetrically, corresponding impedance values are the same, and the oscillator does not determine which of the two modes the oscillator oscillates in, which leads to the unpredictable accurate operation frequency.
SUMMERY OF THE UTILITY MODEL
In view of the above, in order to solve the above problems in the prior art, it is necessary to introduce a phase shift in an oscillator circuit, and the present invention provides a quadrature voltage controlled oscillator circuit with a phase shift, which can stably operate an oscillator in a mode through a simple circuit structure, provide a good phase shift for a resonant circuit in a lower frequency band, and simultaneously improve a tuning range of the oscillator without increasing phase noise.
In order to achieve the above object, the technical solution of the present invention is as follows.
A quadrature voltage-controlled oscillator circuit with phase shift comprises a first voltage-controlled oscillator and a second voltage-controlled oscillator which have the same structure, wherein the first voltage-controlled oscillator and the second voltage-controlled oscillator are connected with each other through an input port and an output port; wherein the first voltage controlled oscillator includes a first cross-coupled oscillation circuit, a first injection locking circuit, a first resonance circuit, and a first voltage controlled current source circuit electrically connected to each other, the first cross-coupled oscillation circuit being composed of four transistors in which a gate of a first transistor and a gate of a third transistor are commonly connected to a bias voltage, a drain of the first transistor is connected to a gate of a fourth transistor through a first node, a drain of the third transistor is connected to a gate of a second transistor through a second node, and a source of the second transistor is connected to a source of the fourth transistor through a third node.
With the circuit configuration, the source of the first transistor and the drain of the second transistor are connected with each other to form a cascode structure, and the source of the third transistor and the drain of the fourth transistor are connected with each other to form a cascode structure. Thus, a phase offset can be provided in the first cross-coupled oscillator circuit, and the oscillator can be stably operated in one mode by a simple circuit configuration.
Further, the first injection locking circuit is composed of four transistors, a gate of a fifth transistor and a gate of a seventh transistor are commonly connected to a bias voltage, a drain of the fifth transistor is connected to a first node, a drain of the seventh transistor is connected to a second node, a source of a sixth transistor is connected to a source of an eighth transistor through a fourth node, a gate of the sixth transistor is connected to the positive quadrature input port, and a gate of the eighth transistor is connected to the negative quadrature input port.
With the circuit configuration, the source of the fifth transistor and the drain of the sixth transistor are connected to each other to form a cascode structure, and the source of the seventh transistor and the drain of the eighth transistor are connected to each other to form a cascode structure. As such, a cascode structure is provided in the first injection locking circuit.
By adding the cascode structure in the first cross-coupled oscillation circuit and the first injection locking circuit, the oscillation signal and the injection signal can be subjected to phase shift simultaneously, so that the output signal synthesized by the oscillation signal and the injection signal generates good phase shift to generate a larger tuning range. Therefore, according to the utility model discloses a quadrature voltage controlled oscillator circuit need not additionally to introduce complicated phase shift circuit, can realize from taking the phase shift. Therefore, the circuit structure is simple, the complexity of the circuit can not be increased while phase shift is provided, the occupied area of the circuit is greatly reduced, and a large amount of area in an integrated chip can not be occupied.
Furthermore, the first resonant circuit further comprises a first middle tap inductor, two ends of the first middle tap inductor are respectively connected with the first node and the second node, and a middle tap is connected with the power supply voltage.
Further, the first voltage-controlled current source circuit comprises a first cross-coupled current source and a first injection locking current source, wherein the drain of the ninth transistor is connected to the third node, the source is grounded, and the gate is connected to the first control voltage to form the first cross-coupled current source; the drain of the tenth transistor is connected with the fourth node, the source is grounded, and the gate is connected with the second control voltage to form a first injection locking current source.
Further, the second voltage-controlled oscillator includes a second cross-coupled oscillation circuit, a second injection locking circuit, a second resonance circuit, and a second voltage-controlled current source circuit electrically connected to each other, and is identical in structure to the first voltage-controlled oscillator, and in the second injection locking circuit, a gate of a sixteenth transistor is connected to the positive in-phase input port, and a gate of an eighteenth transistor is connected to the negative in-phase input port.
Further, the first node of the first voltage controlled oscillator is connected to a negative in-phase output port, and the first negative in-phase output port is connected to a negative in-phase input port of a second voltage controlled oscillator; the second node of the first voltage-controlled oscillator is connected with a positive in-phase output port, and the first positive in-phase output port is connected with a positive in-phase input port of a second voltage-controlled oscillator; a fifth node of the second voltage-controlled oscillator is connected to a quadrature output port, and the second quadrature output port is connected to a quadrature input port of the first voltage-controlled oscillator; the sixth node of the second voltage controlled oscillator is connected to a negative quadrature output port, which is connected to the negative quadrature input port of the first voltage controlled oscillator.
Compared with the prior art, the utility model discloses a quadrature voltage controlled oscillator circuit from area phase shift has following beneficial effect and advantage:
(1) the circuit realizes self-phase shift, and the oscillator can stably work in one mode by using a simple circuit structure;
(2) the circuit can provide at least 5 times phase shift for the resonant circuit in the lower frequency band (10GHz-40GHz), and this boost factor increases with increasing frequency;
(3) compared with the traditional injection locking oscillator, the circuit improves the tuning range of the oscillator and does not increase phase noise.
Drawings
Fig. 1 is a schematic diagram of a quadrature voltage-controlled oscillator circuit with phase shift according to the present invention.
Fig. 2 is a schematic diagram of a conventional quadrature voltage controlled oscillator circuit.
Fig. 3 is a schematic diagram of a quadrature voltage controlled oscillator circuit according to the present invention.
Fig. 4 is a diagram comparing the phase shift performance of the phase shift circuit of the present invention with that of the conventional phase shift circuit.
Fig. 5 is a time domain waveform diagram of the output end of the present invention.
Fig. 6 is a diagram of a frequency adjustment range of a conventional circuit.
Fig. 7 is a diagram of the frequency adjustment range of the circuit of the present invention.
Fig. 8 is a phase noise diagram for frequency offsets of 1M and 10M according to the present invention.
Detailed Description
The following description will further explain embodiments of the present invention by referring to the figures and the specific embodiments. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
As shown in fig. 1, a quadrature voltage-controlled oscillator circuit with phase shift includes a first voltage-controlled oscillator and a second voltage-controlled oscillator with the same structure, where the first voltage-controlled oscillator and the second voltage-controlled oscillator are connected to each other through an input/output port; wherein the first voltage controlled oscillator includes a first cross-coupled oscillation circuit, a first injection locking circuit, a first resonance circuit, and a first voltage controlled current source circuit electrically connected to each other, and a signal is injected through the injection locking circuit and coupled with the oscillator circuit, thereby outputting a quadrature signal.
The first cross-coupled oscillation circuit is constituted by four transistors, in which the gate of the first transistor 101 and the gate of the third transistor 103 are commonly connected to a bias voltage VbThe drain of the first transistor 101 is connected to the gate of the fourth transistor 104 through a first node a, the drain of the third transistor 103 is connected to the gate of the second transistor 102 through a second node B, and the source of the second transistor 102 is connected to the source of the fourth transistor 104 through a third node C.
Preferably, the first injection locking circuit is formed by four transistors, and the gate of the fifth transistor 105 and the gate of the seventh transistor 107 are commonly connected to the bias voltage VbA drain of the fifth transistor 105 is connected to the first node a, a drain of the seventh transistor 107 is connected to the second node B, a source of the sixth transistor 106 is connected to a source of the eighth transistor 108 through the fourth node D, a gate of the sixth transistor 106 is connected to the positive quadrature input port, and a gate of the eighth transistor 108 is connected to the negative quadrature input port.
Preferably, the first resonant circuit further includes a first middle tap inductor 109, two ends of the first middle tap inductor 109 are respectively connected to the first node a and the second node B, and a middle tap is connected to the power supply voltage.
Preferably, the first voltage-controlled current source circuit is composed of a first cross-coupled current source and a first injection-locked current source, wherein the drain of the ninth transistor 110A third node C, a source electrode grounded, and a gate electrode connected to a control voltage V1Forming a first cross-coupled current source; the tenth transistor 111 has a drain connected to the fourth node D, a source connected to ground, and a gate connected to the control voltage V2The first injection locking current source is formed, and the first voltage-controlled current source circuit can adjust the amplitude and the phase of an injection signal and an oscillation signal by adjusting the magnitude of a control voltage, so that the oscillator has a wider tuning range; meanwhile, the placement position of the first voltage-controlled current source circuit has various implementation forms, for example, a structure of upper-end current bias is adopted.
Preferably, the second voltage-controlled oscillator includes a second cross-coupled oscillation circuit, a second injection locking circuit, a second resonance circuit and a second voltage-controlled current source circuit, the second cross-coupled oscillation circuit is composed of four transistors, wherein a source of the eleventh transistor 112 and a drain of the twelfth transistor 113 are connected to each other to form a cascode structure, a source of the thirteenth transistor 114 and a drain of the fourteenth transistor 115 are connected to each other to form a cascode structure, and a gate of the eleventh transistor 112 and a gate of the thirteenth transistor 114 are connected to the bias voltage V, and the second injection locking circuit, the second resonance circuit and the second voltage-controlled current source circuit are electrically connected to each otherbA drain of the eleventh transistor 112 is connected to a gate of the fourteenth transistor 115 through a fifth node E, a drain of the thirteenth transistor 114 is connected to a gate of the twelfth transistor 113 through a sixth node F, and a source of the twelfth transistor 113 is connected to a source of the fourteenth transistor 115 through a seventh node G.
Preferably, the second injection locking circuit is composed of four transistors, wherein the source of the fifteenth transistor 116 and the drain of the sixteenth transistor 117 are connected to each other to form a cascode structure, the source of the seventeenth transistor 118 and the drain of the eighteenth transistor 119 are connected to each other to form a cascode structure, and the gate of the fifteenth transistor 116 and the gate of the seventeenth transistor 118 are commonly connected to the bias voltage VbA drain of the fifteenth transistor 116 is connected to a node E, a drain of the seventeenth transistor 118 is connected to a node F, a source of the sixteenth transistor 117 is connected to a source of the eighteenth transistor 119 through a node H, and the source of the seventeenth transistor is connected to a node FA gate of the sixteenth transistor 117 is connected to the positive common input port, and a gate of the eighteenth transistor 119 is connected to the negative common input port.
Preferably, the second resonant circuit includes a second middle-tapped inductor 120, two ends of the second middle-tapped inductor 120 are respectively connected to a fifth node E and a sixth node F, and a middle tap is connected to the power supply voltage.
Preferably, the second voltage-controlled current source circuit is composed of a second cross-coupled current source and a second injection-locked current source, wherein the drain of the nineteenth transistor 121 is connected to the seventh node G, the source thereof is grounded, and the gate thereof is connected to the control voltage V1Forming a second cross-coupled current source; a twentieth transistor 122 having a drain connected to the eighth node H, a source connected to ground, and a gate connected to the control voltage V2A second injection locked current source is constructed.
Preferably, the first node a of the first voltage-controlled oscillator is connected to a negative non-inverting output port, and the first negative non-inverting output port is connected to a negative non-inverting input port of the second voltage-controlled oscillator; the second node B of the first voltage-controlled oscillator is connected with a positive in-phase output port, and the first positive in-phase output port is connected with a positive in-phase input port of a second voltage-controlled oscillator; a fifth node E of the second voltage-controlled oscillator is connected to a quadrature output port, and the second quadrature output port is connected to a quadrature input port of the first voltage-controlled oscillator; the sixth junction F of the second voltage controlled oscillator is connected to a negative quadrature output port which is connected to the negative quadrature input port of the first voltage controlled oscillator.
Principle of injection locked quadrature voltage controlled oscillator circuit: in the first voltage-controlled oscillator, oscillation signals are generated by two pairs of cascode transistors in the first oscillation circuit, a first injection locking circuit having cascode transistors injects a signal output from the second voltage-controlled oscillator into the first oscillation circuit, the oscillation signal and the injected signal are vector-superposed and injected into a second injection locking circuit of the second voltage-controlled oscillator through a non-inverting output port, the injected signal of the second locking circuit is vector-superposed with a signal generated by the second oscillation circuit in the same manner,and injected into the first voltage controlled oscillator through the quadrature output port. When the first oscillating circuit generates an equivalent transconductance Gm1Equivalent transconductance G generated by the second oscillating circuitm2Satisfies Gm1＝-Gm2When the signal generated from the output port satisfies VI+＝-VI-＝+jVQ+＝-jVQ-Four quadrature signals are generated at the four output ports, which are 90 degrees apart from each other. Further, by simultaneously changing the control voltage V of the first voltage-controlled current source circuit and the second voltage-controlled current source circuit1And V2The magnitude of the oscillation signal and the injection signal can be changed, and then the phase shift of the signal superposed by the vector is changed, so that the tuning function is achieved.
In a conventional quadrature voltage controlled oscillator circuit, since the injection signal may lead or lag the oscillation signal, the phase of the output signal combined with the injection signal appears
Two unknown offsets resulting in a final output frequency of ω1Or ω2Corresponding to mode 1 and mode 2 in fig. 2, these two modes cannot be predicted in practical application.
Therefore, on the basis of the traditional circuit structure, a phase shift circuit is added between the output signals and the output signals of the oscillation circuit of the oscillator and the injection locking circuit, the phase shift circuit can be formed by cascading two transistors forming a cascode structure, and the structure is used for replacing a single transistor in the traditional circuit, so that the original function can be replaced, and a stable phase shift can be provided.
The cascode structure is formed by cascading two transistors, can convert a voltage signal into a current signal, and provides a certain negative phase shift in a certain frequency range. Under the condition of the same parameter, each cascode transistor in the circuit can obtain the expected phase shift by simultaneously changing the size of each cascode transistor according to the characteristic that the parasitic parameter value of each cascode transistor changes along with the change of the working frequency, so that the oscillation signal and the phase shift can be obtainedThe injected signal is turned over at a certain angle at the same time to reach the requirement of orthogonal signal
Thereby operating the oscillator at the position of mode 1 (frequency ω in fig. 3)1) Mode 2 due to the corresponding position (frequency w in fig. 3)2) Is relatively small and does not work as shown in fig. 3.
And simultaneously, because the utility model discloses make the oscillator oscillation in the highest impedance position in center, when voltage-controlled current source circuit changed control voltage's size, oscillation signal and injected signal superimposed signal can keep keeping higher impedance in the position department of deviating the intermediate position broad range, can keep oscillating in the broad range. When the conventional oscillator is in the mode 1 or mode 2 position, the oscillator cannot work because the voltage-controlled current source circuit enters a state of smaller impedance when the magnitude of the control voltage is changed.
The cascode structure also has a larger output impedance compared to conventional circuits, which may prevent parasitic parameters of the transistors from affecting the resonant circuit and make the circuit easier to start up. Therefore, the cascode structure is used as the phase shift circuit, the oscillation and injection functions are achieved, more importantly, compared with the prior art, the complexity of the circuit can be greatly simplified, and phase shift meeting phase deflection can be generated in a lower frequency band. Through simulation verification, in the oscillator that operating frequency is greater than 10GHz, use the varactor in resonant circuit will influence the quality factor of oscillator greatly, but use the utility model discloses a structure can be through adjusting the width to length ratio of the common bars transistor in the cascode structure, makes the phase shift keep about 45 in the frequency channel that is greater than 10GHz, can not lead to the decay of resonant circuit quality factor because of variable capacitance's introduction.
As shown in fig. 4, for the utility model discloses with the phase shift performance comparison of traditional phase shift circuit diagram, the output current of traditional oscillation circuit transistor and input voltage's phase shift curve with the utility model discloses the output current of well transistor compares with input voltage's phase shift curve, and the cascode structure has obtained the phase shift that is greater than traditional several times through its inside parasitic parameter and corresponding voltage-current conversion.
Example 1
A quadrature voltage-controlled oscillator with a phase shift in the 28GHz band is designed and manufactured in TSMC 65nm CMOS technology.
As shown in fig. 5, for the output time domain waveform diagram of the present invention, the waveform of each output in the analog time domain of the present invention is shown, and the voltages of the four output ports are all orthogonal, i.e. the phases are different by 90 °.
As shown in fig. 6 and 7, the frequency adjusting ranges of the conventional circuit and the circuit of the present invention are shown, and the upper line segment of fig. 6 and 7 is shown at V2In the case of 1V, V is changed1The frequency tuning range of the voltage, the lower line segment being indicated at V1In the case of 1V, V is changed2Frequency tuning range of the voltage. The utility model discloses increased initial phase shift for the frequency control range extends 24GHz-30.5GHz from original 27.5GHz-30GHz, and relative bandwidth has promoted 23% from 9%.
The phase noise in the present invention at the offset frequency △ f can be obtained using the following formula:
wherein F is the noise figure, QTIs the loop quality factor, V0Is the output voltage amplitude, k is the Botzmann constant, T is the absolute temperature, C is the loop capacitance, f0Is the central oscillation frequency.
As shown in fig. 8, the analog phase noise variation of the fabricated self-phase-shifted quadrature voltage-controlled oscillator with frequency variation is shown.
To sum up, the utility model discloses a from quadrature voltage controlled oscillator circuit of taking phase shift can make the oscillator work in a mode steadily through simple circuit structure, can provide good phase shift for resonant circuit in lower frequency channel, improves the tuning range of oscillator simultaneously to do not increase phase noise.
Claims (6)
1. A quadrature voltage-controlled oscillator circuit with phase shift comprises a first voltage-controlled oscillator and a second voltage-controlled oscillator which have the same structure, wherein the first voltage-controlled oscillator and the second voltage-controlled oscillator are connected with each other through an input port and an output port; wherein the first voltage-controlled oscillator includes a first cross-coupled oscillation circuit, a first injection locking circuit, a first resonance circuit, and a first voltage-controlled current source circuit that are electrically connected to each other, characterized in that:
the first cross-coupled oscillation circuit is composed of four transistors, wherein the gate of the first transistor (101) and the gate of the third transistor (103) are commonly connected to a bias voltage (V)b) The drain of the first transistor (101) is connected to the gate of the fourth transistor (104) through a first node (a), the drain of the third transistor (103) is connected to the gate of the second transistor (102) through a second node (B), and the source of the second transistor (102) is connected to the source of the fourth transistor (104) through a third node (C).
2. A self phase shifted quadrature voltage controlled oscillator circuit as claimed in claim 1, wherein: the first injection locking circuit is composed of four transistors, and the gate of the fifth transistor (105) and the gate of the seventh transistor (107) are commonly connected to a bias voltage (V)b) A drain of the fifth transistor (105) is connected to the first node (a), a drain of the seventh transistor (107) is connected to the second node (B), a source of the sixth transistor (106) is connected to a source of the eighth transistor (108) through the fourth node (D), a gate of the sixth transistor (106) is connected to the positive quadrature input port, and a gate of the eighth transistor (108) is connected to the negative quadrature input port.
3. A self phase shifted quadrature voltage controlled oscillator circuit as claimed in claim 1, wherein: the first resonant circuit further comprises a first middle tap inductor (109), two ends of the first middle tap inductor (109) are respectively connected with a first node (A) and a second node (B), and a middle tap is connected with a power supply voltage.
4. A self phase shifted quadrature voltage controlled oscillator circuit as claimed in claim 2, wherein: the first voltage-controlled current source circuit comprises a first cross-coupled current source and a first injection locking current source, wherein the drain electrode of the ninth transistor (110) is connected with the third node (C), the source electrode is grounded, and the grid electrode is connected with the first control voltage (V)1) Forming a first cross-coupled current source; a tenth transistor (111) having a drain connected to the fourth node (D), a source connected to ground, and a gate connected to the second control voltage (V)2) A first injection-locked current source is constructed.
5. A self phase shifted quadrature voltage controlled oscillator circuit as claimed in claim 1, wherein: the second voltage controlled oscillator includes a second cross-coupled oscillation circuit, a second injection locking circuit, a second resonance circuit, and a second voltage controlled current source circuit electrically connected to each other, and is identical in structure to the first voltage controlled oscillator, and in the second injection locking circuit, a gate of a sixteenth transistor (117) is connected to the positive non-inverting input port, and a gate of an eighteenth transistor (119) is connected to the negative non-inverting input port.
6. A self phase shifted quadrature voltage controlled oscillator circuit as claimed in claim 1, wherein: the first node (A) of the first voltage controlled oscillator is connected to a first negative in-phase output port of the first voltage controlled oscillator, which is connected to a negative in-phase input port of a second voltage controlled oscillator; the second node (B) of the first voltage-controlled oscillator is connected with a first positive in-phase output port of the first voltage-controlled oscillator, and the first positive in-phase output port is connected with a positive in-phase input port of a second voltage-controlled oscillator; a fifth node (E) of the second voltage controlled oscillator is connected to a second orthonormal output port of the second voltage controlled oscillator, which is connected to the orthonormal input port of the first voltage controlled oscillator; a sixth junction (F) of the second voltage controlled oscillator is connected to a negative quadrature output port of the second voltage controlled oscillator, which is connected to a negative quadrature input port of the first voltage controlled oscillator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822106969 | 2018-12-15 | ||
| CN2018221069693 | 2018-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210273972U true CN210273972U (en) | 2020-04-07 |
Family
ID=70010982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822255748.2U Active CN210273972U (en) | 2018-12-15 | 2018-12-29 | Quadrature voltage-controlled oscillator circuit with phase shift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210273972U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525198A (en) * | 2018-12-15 | 2019-03-26 | 华南理工大学 | A kind of orthogonal voltage-controlled vibrator circuit of included phase shift |
-
2018
- 2018-12-29 CN CN201822255748.2U patent/CN210273972U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525198A (en) * | 2018-12-15 | 2019-03-26 | 华南理工大学 | A kind of orthogonal voltage-controlled vibrator circuit of included phase shift |
| CN109525198B (en) * | 2018-12-15 | 2024-04-23 | 华南理工大学 | Quadrature voltage controlled oscillator circuit with phase shift |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7383033B2 (en) | Differential and quadrature harmonic VCO and methods therefor | |
| US7518458B2 (en) | Oscillator and data processing equipment using the same and voltage control oscillator and data processing equipment using voltage control oscillator | |
| US7239209B2 (en) | Serially RC coupled quadrature oscillator | |
| US7375596B2 (en) | Quadrature voltage controlled oscillator | |
| US7557664B1 (en) | Injection-locked frequency divider | |
| JP4932572B2 (en) | 4-phase voltage controlled oscillator with coupling capacitor | |
| US8792845B2 (en) | Oscillator | |
| KR100523802B1 (en) | Source-Injection Parallel Coupled LC-Quadrature Voltage Controlled Oscillator | |
| US7710211B2 (en) | Injection-locked frequency divider with a wide injection-locked frequency range | |
| KR20050053779A (en) | Circular geometry oscillators | |
| US20080129392A1 (en) | Colpitts quadrature voltage controlled oscillator | |
| CN113949345A (en) | Oscillator circuit | |
| CN210273972U (en) | Quadrature voltage-controlled oscillator circuit with phase shift | |
| KR100900351B1 (en) | Transformer-based LC tank with differential-turned structure and differential-tuned voltage controlled oscillator using the LC tank | |
| CN109525198B (en) | Quadrature voltage controlled oscillator circuit with phase shift | |
| US9106179B2 (en) | Voltage-controlled oscillators and related systems | |
| Jameson et al. | A 93.9–102.5 GHz Colpitts VCO utilizing magnetic coupling band switching in 65nm CMOS | |
| KR101000379B1 (en) | Quadrature VCO based on Direct Back-gate Second Harmonic Coupling | |
| CN110690897A (en) | Low-power injection locking frequency divider with wide frequency band locking range | |
| US9240754B2 (en) | Frequency fine tuning | |
| Abedi et al. | A 53–61GHz Low-Power PLL With Harmonic Positive Feedback VCO in 65nm CMOS | |
| US8493155B2 (en) | Multiband voltage controlled oscillator without switched capacitor | |
| Saha et al. | A C-band wide locking range injection locked oscillator based phase shifter | |
| TWI536730B (en) | Quadrature phase relaxation oscillator | |
| CN114513207B (en) | Injection locking three-frequency dividing circuit with second harmonic enhancement sub-resonant cavity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |