CN209659243U - A kind of LC voltage-controlled oscillator (VCO) circuit that can inhibit second_harmonic generation - Google Patents
A kind of LC voltage-controlled oscillator (VCO) circuit that can inhibit second_harmonic generation Download PDFInfo
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- CN209659243U CN209659243U CN201920550202.1U CN201920550202U CN209659243U CN 209659243 U CN209659243 U CN 209659243U CN 201920550202 U CN201920550202 U CN 201920550202U CN 209659243 U CN209659243 U CN 209659243U
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Abstract
The utility model proposes the LC voltage-controlled oscillator (VCO) circuits that one kind can inhibit second_harmonic generation, including by inductance L1, L2 and variable capacitance C1, the first resonant network that C2 is constituted, concussion is to pipe M1 and M2, and biasing circuit, it is characterized by: the biasing circuit includes being in parallel the second resonant network constituted by inductance L3 and capacitor C3, current offset tube M3 and shunt capacitance C4, second resonant tank is set to concussion to pipe M1, between M2 and current offset tube M3, the current offset tube M3 ground connection, the shunt capacitance C4 is in parallel with current offset tube M3 to form the low impedance path for being directed to second harmonic.The utility model has the LC voltage-controlled oscillator (VCO) circuit to second harmonic inhibiting effect, and the biasing circuit with noise suppressed effect, can inhibit to the second harmonic generated in LC voltage-controlled oscillator (VCO), to reduce the second harmonic in output end.
Description
Technical field
The utility model belongs to communication technique field, and in particular to one kind can inhibit the voltage-controlled shake of the LC of second_harmonic generation
Swing device circuit.
Background technique
Phaselocked loop (PLL) circuit is comprising modules important in communication system, and its role is to provide institute for communication system
Accurately working frequency is needed, and voltage-controlled oscillator (VCO) (VCO) is the important module of phase-locked loop circuit, main function is to generate conjunction
Suitable oscillation frequency, locks through phase-locked loop circuit, and accurate and stable working frequency is provided for system, especially in radio communication system
In system, the quality of voltage-controlled oscillator (VCO) performance directly determines the performance of entire communication system.Since LC voltage-controlled oscillator (VCO) is with non-
The often high purity of frequency spectrum, so being widely used in RF communication system.
Existing voltage-controlled oscillator (VCO) includes difference LC voltage-controlled oscillator (VCO) (see attached drawing 1), L1, L2 and variable capacitance C1, C2
Resonant network is constituted, the oscillation frequency of voltage-controlled oscillator (VCO) isWherein: fosc is the concussion of oscillator
Frequency can change the value of C1 and C2, therefore the oscillation frequency of oscillator can be adjusted by Vc by applying different voltages to Vc
Section, thus referred to as voltage-controlled oscillator (VCO) (VCO) and to feed back to the input impedance of pipe M1 and M2 be Rin=-2/gm, wherein Rin is anti-
The input impedance to pipe is presented, gm is the mutual conductance of M1 and M2.When the anti-impedance more than or equal to resonant network LC of input, the concussion
Device will shake, and M3 provides direct current biasing for oscillator.
There is the second harmonics that the deficiency to noise suppressed, especially oscillator generate for above-mentioned LC voltage-controlled oscillator (VCO).In
In the application of Direct conversion transmitter, if the second harmonic that oscillator generates is crossed conference and is generated in final transmitting signal
Extra sideband signals can seriously affect the quality of transmitting signal, thus the communication quality of degrading communication system.It is pressed in existing LC
It controls in oscillator circuit, for biasing circuit M3 to second harmonic at low-resistance effect, the second harmonic that oscillator generates can be with earthquake
Output, the concussion of device are formed into a loop between pipe (M1 and M2) current offset tube (M3) and ground, therefore do not press down to second harmonic
Production is used.If the second harmonic generated in current offset tube (M3) simultaneously also can reach the defeated of oscillator with this access
Outlet.
Utility model content
To overcome defect existing in the prior art, the utility model proposes the LC that one kind can inhibit second_harmonic generation
Voltage-controlled oscillator (VCO) circuit, particular technique content are as follows:
A kind of LC voltage-controlled oscillator (VCO) circuit that can inhibit second_harmonic generation, including by inductance L1, L2 and variable capacitance
The first resonant network that C1, C2 are constituted shakes to pipe M1 and M2 and biasing circuit, it is characterised in that: the biasing circuit packet
It includes and is in parallel the second resonant network constituted, current offset tube M3 and shunt capacitance C4 by inductance L3 and capacitor C3, described the
Two resonant tanks are set to concussion between pipe M1, M2 and current offset tube M3, and the current offset tube M3 is grounded, the bypass
Capacitor C4 is in parallel with current offset tube M3 to form the low impedance path for being directed to second harmonic.The resonance frequency of second resonant network
Rate is twice of first resonant network.
Compared with prior art, the superiority of the utility model is embodied in: being had and is pressed the LC of second harmonic inhibiting effect
Control oscillator circuit, and the biasing circuit of noise suppressed；The biasing circuit is by biased electrical flow tube M3, secondary resonance circuit
L3, C3 and second harmonic shunt capacitance C4 composition, its role is to L3 and the C3 resonant network formed generate oscillator two
High impedance is presented in subharmonic, and blocking concussion, wherein second harmonic is to the circuit on ground, and its role is to be biased electrical by shunt capacitance C4
The second harmonic that stream source generates provides low impedance path, is that the second harmonic that current source generates passes through C4 to ground, without upward
It enters in oscillator circuit.The advantage that the utility model has structure simple, easy to accomplish.Most important is that the utility model is several
It is a kind of technology of super low-power consumption without consuming additional power consumption.In addition, the utility model is by introducing noise suppressed biasing
Circuit can the second harmonic to system effectively inhibited.
Detailed description of the invention
Fig. 1 is the circuit diagram of difference LC voltage-controlled oscillator (VCO) in the prior art.
Fig. 2 is the second harmonic access schematic diagram of difference LC voltage-controlled oscillator (VCO) in the prior art.
Fig. 3 is the circuit diagram of the utility model.
Fig. 4 is the second harmonic inhibitory effect schematic diagram of the utility model.
Specific embodiment
As follows in conjunction with attached drawing, application scheme is further described:
Referring to attached drawing 3 and 4, a kind of LC voltage-controlled oscillator (VCO) circuit that can inhibit second_harmonic generation, including by inductance L1,
The first resonant network that L2 and variable capacitance C1, C2 are constituted, shakes to pipe M1 and M2 and biasing circuit, it is characterised in that: institute
Stating biasing circuit includes being in parallel the second resonant network constituted, current offset tube M3 and bypass electricity by inductance L3 and capacitor C3
Hold C4, second resonant tank is set to concussion between pipe M1, M2 and current offset tube M3, and the current offset tube M3 connects
Ground, the shunt capacitance C4 is in parallel with current offset tube M3 to form the low impedance path for being directed to second harmonic.
Biasing circuit is that oscillator (inductance L1 and L2, variable capacitance C1 and C2, concussion are to pipe M1 and M2) provides biased electrical
Stream, in which: of both current offset tube M3 plays the role of, on the one hand it can provide bias current for voltage-controlled oscillator (VCO),
High impedance also is presented to the odd harmonic of oscillator simultaneously, so virtual earth effect is presented at point A for odd harmonic,
Odd harmonic can offset each other here.In order to provide inhibition of the voltage-controlled oscillator (VCO) to even-order harmonic, especially second harmonic, need
Will the current source high-impedance state will be also presented to second harmonic.The utility model introduces L3 in the current source of LC voltage-controlled oscillator (VCO)
The new biasing circuit with noise suppressed effect with C3 and shunt capacitance C4 composition, can be to generating in LC voltage-controlled oscillator (VCO)
Second harmonic inhibited, thus reduce output end second harmonic.The second resonance being made of inductance L3 and capacitor C3
The resonance frequency of network is LC voltage-controlled oscillator (VCO) oscillation frequency (i.e. the first resonant network) twice, its role is to inductance L3 and
High impedance is presented on the second harmonic of capacitor C3 earthquake device, the access of the second harmonic that oscillator can be blocked to generate to ground,
The second harmonic generated to oscillator is effectively inhibited, and shunt capacitance C4 is the shunt capacitance of second harmonic, is acted on
Low impedance path is provided in the second harmonic generated for bias current sources, is that the second harmonic that current source generates passes through shunt capacitance
C4 is to ground, without being upwardly into the main circuit of oscillator.
It is that above-mentioned preferred embodiment should be regarded as application scheme embodiment for example, all with application scheme thunder
Same, approximate or technology deduction, replacement, improvement for making based on this etc., are regarded as the protection scope of this patent.
Claims (2)
1. one kind can inhibit the LC voltage-controlled oscillator (VCO) circuit of second_harmonic generation, including by inductance L1, L2 and variable capacitance C1,
The first resonant network that C2 is constituted shakes to pipe M1 and M2 and biasing circuit, it is characterised in that: the biasing circuit includes
It is in parallel the second resonant network constituted, current offset tube M3 and shunt capacitance C4 by inductance L3 and capacitor C3, described second
Resonant tank is set to concussion between pipe M1, M2 and current offset tube M3, and the current offset tube M3 is grounded, the bypass electricity
Hold the C4 low impedance path that is formed for second harmonic in parallel with current offset tube M3.
2. the LC voltage-controlled oscillator (VCO) circuit according to claim 1 that second_harmonic generation can be inhibited, it is characterised in that: institute
The resonance frequency for stating the second resonant network is twice of first resonant network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920550202.1U CN209659243U (en) | 2019-04-22 | 2019-04-22 | A kind of LC voltage-controlled oscillator (VCO) circuit that can inhibit second_harmonic generation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920550202.1U CN209659243U (en) | 2019-04-22 | 2019-04-22 | A kind of LC voltage-controlled oscillator (VCO) circuit that can inhibit second_harmonic generation |
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| CN209659243U true CN209659243U (en) | 2019-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109951156A (en) * | 2019-04-22 | 2019-06-28 | 广州优瑞芯微电子技术有限公司 | A kind of LC voltage-controlled oscillator (VCO) circuit that can inhibit second_harmonic generation |
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2019
- 2019-04-22 CN CN201920550202.1U patent/CN209659243U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109951156A (en) * | 2019-04-22 | 2019-06-28 | 广州优瑞芯微电子技术有限公司 | A kind of LC voltage-controlled oscillator (VCO) circuit that can inhibit second_harmonic generation |
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