CN109995325A - A kind of low noise RC oscillator - Google Patents
A kind of low noise RC oscillator Download PDFInfo
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- CN109995325A CN109995325A CN201811634025.1A CN201811634025A CN109995325A CN 109995325 A CN109995325 A CN 109995325A CN 201811634025 A CN201811634025 A CN 201811634025A CN 109995325 A CN109995325 A CN 109995325A
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- drain electrode
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- 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
- 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
- H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
- H03B5/24—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator active element in amplifier being semiconductor device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
The invention discloses a kind of low noise RC oscillators, are related to technical field of integrated circuits.Low noise RC oscillator includes phase-locked loop, the phase-locked loop includes sequentially connected low-pass filter circuit, voltage-controlled oscillator circuit, differential-to-single-ended circuit, and it is connected to the divider circuit of the voltage-controlled oscillator circuit and the differential-to-single-ended circuit, it is characterized in that, the low noise RC oscillator further includes the switched-capacitor circuit for being connected to the divider circuit, it is connected to the current mirroring circuit and current comparator circuit of the low-pass filter circuit, the current comparison circuit is also connected with bias current sources, voltage regulator circuit.Technical solution of the present invention filters out the noise in RC oscillator, while the noise that phase-locked loop bandwidth inhibits voltage-controlled oscillator circuit to generate by low-pass filter circuit, so that the phase noise in RC oscillator greatly reduces, to meet the requirement of High Definition Systems.
Description
Technical field
The present invention relates to technical field of integrated circuits, more particularly to a kind of low noise RC oscillator.
Background technique
With integrated circuit fast development, in phaselocked loop, exempt from crystal oscillator USB, high-speed ADC and radio frequency system, high power supply
Voltage inhibits, low noise reference clock generator is in low cost, low-power consumption NB-IOT(Narrow Band Internet of
Things, narrowband Internet of Things) field is using more and more extensive.Clock generator is NB-IOT equipment and can carry Medical Devices and mention
For accurately system clock or counter, guarantee that system is capable of the work of normal table, the variation of temperature and supply voltage is
Influence the factor of the frequency stability most critical of on piece RC oscillator.Therefore, a low noise is designed and to temperature and power supply electricity
The insensitive RC oscillator of bucklingization is needed for following trend.
Summary of the invention
The main purpose of the present invention is to provide a kind of low noise RC oscillators, it is intended to reduce the phase noise of oscillator.
To achieve the above object, the present invention provides a kind of low noise RC oscillator, including phase-locked loop, the phase-locked loop
Including sequentially connected low-pass filter circuit, voltage-controlled oscillator circuit, differential-to-single-ended circuit, and it is connected to described
The divider circuit of voltage-controlled oscillator circuit and the differential-to-single-ended circuit, the low noise RC oscillator further includes being connected to
The switched-capacitor circuit of the divider circuit is connected to the current mirroring circuit and current comparator of the low-pass filter circuit
Circuit, the current comparison circuit are also connected with bias current sources, voltage regulator circuit；
The bias current sources provide bias supply, the current comparator circuit output control for the current comparator circuit
To the low-pass filter, the voltage-controlled oscillator circuit generates clock frequency and is carried out with controlling the switched-capacitor circuit voltage
Charge/discharge；The voltage-controlled oscillator circuit exports the clock frequency to the differential-to-single-ended circuit, so that the difference
Turn single-end circuit output clock signal.
Preferably, the current mirroring circuit includes operational amplifier, the first PMOS tube, the second PMOS tube, third PMOS tube
With the 4th PMOS tube, first PMOS tube and second PMOS tube are connected to two inputs of the operational amplifier
End, the third PMOS tube and the 4th PMOS tube are connected to two output ends of the operational amplifier.
Preferably, it is mutual to be connected to power supply, grid for the source electrode of first PMOS tube and the source electrode of second PMOS tube
Connection, drain electrode are connected to two input terminals of the operational amplifier；
The grid of the third PMOS tube and the 4th PMOS tube is connected to two output ends of the operational amplifier；
The source electrode of the third PMOS tube is connected to the drain electrode of first PMOS tube, drain electrode is connected to first PMOS tube
Grid and current comparator circuit；The source electrode of 4th PMOS tube is connected to the drain electrode of second PMOS tube, drain electrode difference
It is connected to the current comparator circuit and the low-pass filter circuit.
Preferably, the current comparator circuit includes the first NMOS tube, the second NMOS tube, third NMOS tube, the 4th
NMOS tube, the 5th NMOS tube and the 6th NMOS tube；
The drain electrode of first NMOS tube is connected to the drain electrode of third PMOS tube, grid is connected to the leakage of the third NMOS tube
Pole, source electrode are connected to the grid of the 5th NMOS tube；The drain electrode of second NMOS tube is connected to the 4th PMOS tube
Drain electrode, grid are connected to the drain electrode of the 4th NMOS tube, source electrode is connected to the grid of the 6th NMOS tube；
The drain electrode of the third NMOS tube is connected to the bias current sources, source electrode be connected to the 5th NMOS tube drain electrode,
Grid is connected to the grid of the 4th NMOS tube；The drain electrode of 4th NMOS tube is connected to the bias current sources, source electrode
It is connected to the drain electrode of the 6th NMOS tube；
The source electrode of 5th NMOS tube and the 6th NMOS tube ground connection, grid are connected to voltage regulator circuit.
Preferably, the current comparator circuit is also connected with variable resistance, and one end of the variable resistance is connected to institute
State the grid of the 5th NMOS tube, other end ground connection.
Preferably, the voltage regulator circuit includes first resistor and second resistance；One end of the first resistor is connected to institute
State the grid of the 5th NMOS tube, other end ground connection；One end of the second resistance is connected to the grid of the 6th NMOS tube, separately
One end ground connection.
Preferably, the resistance value of the first resistor is equal with the resistance value of the second resistance.
Preferably, the bias current sources include the first bias current, the second bias current, first capacitor and the second electricity
Hold, first bias current is connected to the drain electrode of the 4th NMOS tube, and second bias current is connected to the third
The drain electrode of NMOS tube；
One end of the first capacitor is connected to first bias current, other end ground connection；One end of second capacitor connects
It is connected to second bias current, other end ground connection.
Preferably, the switched-capacitor circuit include third capacitor and be connected to the divider circuit first switch and
Second switch, grid, the other end that one end of the first switch is connected to the 6th NMOS tube are connected to the third electricity
One end of one end of appearance and the second switch, the other end of the third capacitor and the other end ground connection of the second switch.
Technical solution of the present invention exports control voltage to phase-locked loop, so as to state voltage controlled oscillation by current comparator circuit
Device circuit generates clock frequency and carries out charge/discharge to control the switched-capacitor circuit；RC is filtered out by low-pass filter circuit
Noise in oscillator, while the noise that phase-locked loop bandwidth inhibits voltage-controlled oscillator circuit to generate, so that RC vibrates
Phase noise in device greatly reduces, to meet the requirement of High Definition Systems.
Detailed description of the invention
Fig. 1 is the circuit diagram of low noise RC oscillator of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The following further describes the present invention with reference to the drawings.
The embodiment of the present invention provides a kind of low noise RC oscillator, as shown in Figure 1, including phase-locked loop, the phaselocked loop
Road includes sequentially connected low-pass filter circuit LPF, voltage-controlled oscillator circuit VCO, differential-to-single-ended circuit DTS, Yi Jifen
It is not connected to the divider circuit N of the voltage-controlled oscillator circuit VCO and the differential-to-single-ended circuit DTS, the low noise
RC oscillator further includes the switched-capacitor circuit for being connected to the divider circuit N, is connected to the low-pass filter circuit LPF
Current mirroring circuit and current comparator circuit, the current comparison circuit be also connected with bias current sources, voltage regulator circuit；
The bias current sources provide bias supply, the current comparator circuit output control for the current comparator circuit
For voltage to the low-pass filter, the voltage-controlled oscillator circuit VCO generates clock frequency to control the switched-capacitor circuit
Carry out charge/discharge；The voltage-controlled oscillator circuit VCO exports the clock frequency to the differential-to-single-ended circuit DTS, with
Make the differential-to-single-ended circuit DTS output clock signal clk.
Specifically, phase-locked loop includes low-pass filter circuit LPF, differential-to-single-ended circuit DTS, voltage controlled oscillator electricity
Road VCO and divider circuit N is circuit common in the prior art.
Preferably, the current mirroring circuit includes operational amplifier OP, the first PMOS tube MP1, the second PMOS tube MP2,
Three PMOS tube MP3 and the 4th PMOS tube MP4, the first PMOS tube MP1 and the second PMOS tube MP2 are connected to described
Two input terminals of operational amplifier OP, the third PMOS tube MP3 and the 4th PMOS tube MP4 are connected to the fortune
Calculate two output ends of amplifier OP.
In a particular embodiment, operational amplifier OP is that gain improves amplifier, for improving current comparator circuit output
Control voltage output impedance, to improve the power supply rejection ability of oscillator.
Preferably, the source electrode of the source electrode of the first PMOS tube MP1 and the second PMOS tube MP2 are connected to power supply, grid
Pole is connected with each other, draining is connected to two input terminals of the operational amplifier OP；
The grid of the third PMOS tube MP3 and the 4th PMOS tube MP4 are connected to the two of the operational amplifier OP
A output end；The source electrode of the third PMOS tube MP3 is connected to the drain electrode of the first PMOS tube MP1, drain electrode is connected to
The grid and current comparator circuit of the first PMOS tube MP1；The source electrode of the 4th PMOS tube MP4 is connected to described second
Drain electrode, the drain electrode of PMOS tube MP2 is connected to the current comparator circuit and the low-pass filter circuit LPF.
Preferably, the current comparator circuit includes the first NMOS tube MN1, the second NMOS tube MN2, third NMOS tube
MN3, the 4th NMOS tube MN4, the 5th NMOS tube MN5 and the 6th NMOS tube MN6；The drain electrode of the first NMOS tube MN1 is connected to
The drain electrode of third PMOS tube MP3, grid are connected to the drain electrode of the third NMOS tube MN3, source electrode is connected to the 5th NMOS
The grid of pipe MN5；
The drain electrode of the second NMOS tube MN2 is connected to the drain electrode of the 4th PMOS tube MP4, grid is connected to the described 4th
The drain electrode of NMOS tube MN4, source electrode are connected to the grid of the 6th NMOS tube MN6；The drain electrode of the third NMOS tube MN3 connects
In the bias current sources, source electrode are connected to the drain electrode of the 5th NMOS tube MN5, grid is connected to the 4th NMOS tube
The grid of MN4；
The drain electrode of the 4th NMOS tube MN4 is connected to the bias current sources, source electrode is connected to the 6th NMOS tube MN6's
Drain electrode；The source electrode ground connection of the 5th NMOS tube MN5 and the 6th NMOS tube MN6, grid are connected to voltage regulator circuit.
The noise that current mirroring circuit and current comparator circuit introduce is smaller, so as to reduce the capacitor of low-pass filter
Value, filters out the low-frequency noise in RC oscillator by low-pass filter circuit, while increasing loop bandwidth to inhibit voltage controlled oscillation
The high-frequency noise that device circuit generates, so that the noise of entire RC oscillator substantially reduces.
Preferably, the bias current sources include the first bias current Iref1, the second bias current Iref2, first capacitor
C1 and the second capacitor C2, the first bias current Iref1 are connected to the drain electrode of the 4th NMOS tube MN4, and described second partially
Set the drain electrode that electric current Iref2 is connected to the third NMOS tube MN3；
One end of the first capacitor C1 is connected to the first bias current Iref1, other end ground connection；The second capacitor C2
One end be connected to the second bias current Iref2, the other end ground connection.
First bias current Iref1 and the second bias current Iref2 is respectively third NMOS tube MN3 and the 4th NMOS tube
MN4 provides bias current.First capacitor C1 and the second capacitor C2 control the first bias current Iref1 and the second bias current respectively
Iref2 stablizes, to provide stable bias current sources for current comparator circuit.
Preferably, the current comparator circuit is also connected with variable resistance R_t, and one end of the variable resistance R_t connects
It is connected to the grid of the 5th NMOS tube MN5, other end ground connection.The third end of variable resistance R_t can connect according to specific embodiment
It is connected to the 5th NMOS tube MN5 or ground connection.
Variable resistance R_t is compared by being combined to produce different output frequencies with switched-capacitor circuit by electric current
Device circuit generates different control voltage, carrys out control switch electricity to control voltage-controlled oscillator circuit VCO generation out of phase clock
Capacitive circuit.Output frequency is calculated by equation f=1/RC, and wherein f is output frequency, and R is the resistance value of variable resistance R_t, and C is
Capacitance in switched-capacitor circuit.
Preferably, the voltage regulator circuit includes first resistor R1 and second resistance R2；One end of the first resistor R1 connects
It is connected to the grid of the 5th NMOS tube MN5, other end ground connection；One end of the second resistance R2 is connected to the 6th NMOS
The grid of pipe MN6, other end ground connection.
Preferably, the resistance value of the first resistor R1 is equal with the resistance value of the second resistance R2.
Pressure stabilizing sub-circuit provides Vx1 and Vx2 two o'clock clamper electricity by combining with current comparator circuit, for RC oscillator
Pressure, so that Vx1 and Vx2 two o'clock voltage is equal as far as possible, reaches dynamic equilibrium.
Preferably, the switched-capacitor circuit includes third capacitor C3 and is connected to the first of the divider circuit N and opens
S1 and second switch S2 is closed, one end of the first switch S1 is connected to the grid of the 6th NMOS tube MN6, other end connection
In one end of the third capacitor C3 and one end of the second switch S2, the other end and described second of the third capacitor C3
The other end of switch S2 is grounded.
Divider circuit N receives the out of phase clock that voltage-controlled oscillator circuit VCO is generated, to export different frequency point
Not Kong Zhi first switch S1 and second switch S2 folding, to control the charge and discharge of third capacitor C3.
It should be understood that the above is only a preferred embodiment of the present invention, the scope of the patents of the invention cannot be therefore limited,
It is all to utilize equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, directly or indirectly use
In other related technical areas, it is included within the scope of the present invention.
Claims (9)
1. a kind of low noise RC oscillator, including phase-locked loop, the phase-locked loop includes sequentially connected low-pass filter electricity
Road, voltage-controlled oscillator circuit, differential-to-single-ended circuit, and it is connected to the voltage-controlled oscillator circuit and the difference turn
The divider circuit of single-end circuit, which is characterized in that the low noise RC oscillator further includes being connected to the divider circuit
Switched-capacitor circuit, be connected to the current mirroring circuit and current comparator circuit of the low-pass filter circuit, the electric current
Comparison circuit is also connected with bias current sources, voltage regulator circuit；
The bias current sources provide bias supply, the current comparator circuit output control for the current comparator circuit
To the low-pass filter, the voltage-controlled oscillator circuit generates clock frequency and is carried out with controlling the switched-capacitor circuit voltage
Charge/discharge；The voltage-controlled oscillator circuit exports the clock frequency to the differential-to-single-ended circuit, so that the difference
Turn single-end circuit output clock signal.
2. low noise RC oscillator according to claim 1, which is characterized in that the current mirroring circuit includes operation amplifier
Device, the first PMOS tube, the second PMOS tube, third PMOS tube and the 4th PMOS tube, first PMOS tube and the 2nd PMOS
Pipe is connected to two input terminals of the operational amplifier, and the third PMOS tube and the 4th PMOS tube are separately connected
In two output ends of the operational amplifier.
3. low noise RC oscillator according to claim 2, which is characterized in that the source electrode of first PMOS tube and described
The source electrode of second PMOS tube is connected to power supply, grid is connected with each other, drain electrode be connected to two of the operational amplifier it is defeated
Enter end；
The grid of the third PMOS tube and the 4th PMOS tube is connected to two output ends of the operational amplifier；
The source electrode of the third PMOS tube is connected to the drain electrode of first PMOS tube, drain electrode is connected to first PMOS tube
Grid and current comparator circuit；The source electrode of 4th PMOS tube is connected to the drain electrode of second PMOS tube, drain electrode difference
It is connected to the current comparator circuit and the low-pass filter circuit.
4. low noise RC oscillator according to claim 2, which is characterized in that the current comparator circuit includes first
NMOS tube, the second NMOS tube, third NMOS tube, the 4th NMOS tube, the 5th NMOS tube and the 6th NMOS tube；
The drain electrode of first NMOS tube is connected to the drain electrode of third PMOS tube, grid is connected to the leakage of the third NMOS tube
Pole, source electrode are connected to the grid of the 5th NMOS tube；The drain electrode of second NMOS tube is connected to the 4th PMOS tube
Drain electrode, grid are connected to the drain electrode of the 4th NMOS tube, source electrode is connected to the grid of the 6th NMOS tube；
The drain electrode of the third NMOS tube is connected to the bias current sources, source electrode be connected to the 5th NMOS tube drain electrode,
Grid is connected to the grid of the 4th NMOS tube；The drain electrode of 4th NMOS tube is connected to the bias current sources, source electrode
It is connected to the drain electrode of the 6th NMOS tube；
The source electrode of 5th NMOS tube and the 6th NMOS tube ground connection, grid are connected to voltage regulator circuit.
5. low noise RC oscillator according to claim 4, which is characterized in that the current comparator circuit is also connected with
Variable resistance, one end of the variable resistance are connected to the grid of the 5th NMOS tube, other end ground connection.
6. low noise RC oscillator according to claim 4, which is characterized in that the voltage regulator circuit includes first resistor
And second resistance；One end of the first resistor is connected to the grid of the 5th NMOS tube, other end ground connection；Second electricity
One end of resistance is connected to the grid of the 6th NMOS tube, other end ground connection.
7. low noise RC oscillator according to claim 6, which is characterized in that the resistance value of the first resistor and described the
The resistance value of two resistance is equal.
8. low noise RC oscillator according to claim 4, which is characterized in that the bias current sources include the first biasing
Electric current, the second bias current, first capacitor and the second capacitor, first bias current are connected to the leakage of the 4th NMOS tube
Pole, second bias current are connected to the drain electrode of the third NMOS tube；
One end of the first capacitor is connected to first bias current, other end ground connection；One end of second capacitor connects
It is connected to second bias current, other end ground connection.
9. low noise RC oscillator according to claim 4, which is characterized in that the switched-capacitor circuit includes third electricity
Hold and be connected to the first switch and the second switch of the divider circuit, one end of the first switch is connected to the described 6th
Grid, the other end of NMOS tube are connected to one end of the third capacitor and one end of the second switch, the third capacitor
The other end and the second switch the other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811634025.1A CN109995325B (en) | 2018-12-29 | 2018-12-29 | Low-noise RC oscillator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811634025.1A CN109995325B (en) | 2018-12-29 | 2018-12-29 | Low-noise RC oscillator |
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| CN109995325A true CN109995325A (en) | 2019-07-09 |
| CN109995325B CN109995325B (en) | 2023-05-30 |
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| CN201811634025.1A Active CN109995325B (en) | 2018-12-29 | 2018-12-29 | Low-noise RC oscillator |
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Cited By (3)
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| CN110492849A (en) * | 2019-09-02 | 2019-11-22 | 成都锐成芯微科技股份有限公司 | A kind of RC oscillating circuit |
| CN111181491A (en) * | 2019-12-31 | 2020-05-19 | 成都锐成芯微科技股份有限公司 | Clock generating circuit |
| CN111641410A (en) * | 2020-06-22 | 2020-09-08 | 上海兆芯集成电路有限公司 | Digital phase-locked loop |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492849A (en) * | 2019-09-02 | 2019-11-22 | 成都锐成芯微科技股份有限公司 | A kind of RC oscillating circuit |
| CN110492849B (en) * | 2019-09-02 | 2023-07-28 | 成都锐成芯微科技股份有限公司 | RC oscillating circuit |
| CN111181491A (en) * | 2019-12-31 | 2020-05-19 | 成都锐成芯微科技股份有限公司 | Clock generating circuit |
| CN111181491B (en) * | 2019-12-31 | 2023-07-28 | 成都锐成芯微科技股份有限公司 | Clock generating circuit |
| CN111641410A (en) * | 2020-06-22 | 2020-09-08 | 上海兆芯集成电路有限公司 | Digital phase-locked loop |
| CN111641410B (en) * | 2020-06-22 | 2023-11-17 | 上海兆芯集成电路股份有限公司 | Digital phase-locked loop |
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| Publication number | Publication date |
|---|---|
| CN109995325B (en) | 2023-05-30 |
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