Power noise suppression circuit, corresponding current numerically controlled oscillator and electronic device

Abstract

The present invention discloses a power supply noise suppression circuit, a corresponding current numerically controlled oscillator, and an electronic device. The power supply noise suppression circuit includes a self-biased current source, a noise feedback unit, a current mirror unit, a noise sensing unit, and a load output unit; wherein, the self-biased current source provides a sampling voltage caused by the voltage fluctuation of the first power supply terminal noise for the noise feedback unit; the noise sensing unit provides a sampling voltage caused by the voltage fluctuation of the second power supply terminal noise for the noise feedback unit; the noise feedback unit cancels the noise fluctuation voltages in the two input sampling voltages and outputs a stable current; the current mirror unit performs current mirror replication on the stable current and outputs it to the load output unit; the load output unit provides a stable output current for the load circuit. The present invention effectively suppresses power supply noise, enabling the current numerically controlled oscillator to meet the requirements of system performance.

Description

Technical Field

[0001] The present invention relates to a power supply noise suppression circuit for a current numerically controlled oscillator, and also relates to a current numerically controlled oscillator and a corresponding electronic device adopting the power supply noise suppression circuit, belonging to the technical field of electronic oscillators. Background Art

[0002] In a current numerically controlled oscillator, a self-biased current source is an important component. After the voltage at the power supply terminal of a traditional self-biased current source is affected by noise, voltage fluctuations will occur and be transmitted to the load circuit (i.e., the current numerically controlled oscillator) through current mirroring, causing a certain current fluctuation in the load circuit. This is a serious problem for a current numerically controlled oscillator with high resolution requirements. Therefore, researching and developing a power supply circuit for a current numerically controlled oscillator with a high power supply noise suppression function has become a very necessary technical topic.

[0003] In the Chinese invention patent with the authorization announcement number CN 106230384B, a programmable low-noise voltage-controlled oscillator is disclosed, which includes a bias circuit, a numerically controlled current steering group, and a current control oscillator; the bias circuit is connected to the numerically controlled current steering group, and the numerically controlled current steering group is connected to the current control oscillator. Among them, the bias circuit includes NMOS transistors NM1 and NM2 and PMOS transistors PM1 and PM2, and the NMOS transistors NM1 and NM2 form a current mirror. The oscillation unit of this current control oscillator is composed of an inverter formed by superimposing two PMOS transistors and two NMOS transistors, which can effectively suppress noise from the power supply. At the same time, cascaded inverters are used for output to reduce the influence of the internal noise of the voltage-controlled oscillator on the output signal and improve the noise performance of the oscillator. Summary of the Invention

[0004] The primary technical problem to be solved by the present invention is to provide a power supply noise suppression circuit for a current numerically controlled oscillator.

[0005] Another technical problem to be solved by the present invention is to provide a current numerically controlled oscillator adopting the above power supply noise suppression circuit.

[0006] Another technical problem to be solved by the present invention is to provide an electronic device adopting the above current numerically controlled oscillator.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] According to the first aspect of the embodiment of the present invention, a power supply noise suppression circuit for a current numerically controlled oscillator is provided, including a self-biased current source, a current mirror unit, a load output unit, a noise feedback unit, and a noise sensing unit; wherein,

[0009] The self - bias current source provides a sampling voltage for the voltage fluctuation caused by the noise at the first power supply terminal to the noise feedback unit;

[0010] The noise sensing unit provides a sampling voltage for the voltage fluctuation caused by the noise at the second power supply terminal to the noise feedback unit;

[0011] The noise feedback unit cancels the noise fluctuation voltages in the two sampling voltages and outputs a stable current;

[0012] The current mirror unit performs current mirror replication on the stable current and outputs it to the load output unit;

[0013] The load output unit provides a stable output current for the load circuit.

[0014] Preferably, the self - bias current source unit is composed of a first PMOS transistor M0, a second PMOS transistor M1, a first NMOS transistor M2 and a first resistor R1; wherein, the source of the first PMOS transistor M0 is connected to the power supply terminal VDD, the gate of the first PMOS transistor M0 is short - circuited with the drain and then connected to the gate of the second PMOS transistor M1; the drain of the first PMOS transistor M0 is connected to the drain of the first NMOS transistor M2, the source of the first NMOS transistor M2 is connected to the ground potential terminal GND, the gate of the first NMOS transistor M2 is connected to the gate of the second NMOS transistor M3 in the noise feedback unit and the output terminal of the first operational amplifier; the first resistor R1 is connected to the power supply terminal VDD, the other end of the first resistor R1 is connected to the source of the second PMOS transistor M1, and the drain of the second PMOS transistor M1, the drain of the second NMOS transistor M3 in the noise feedback unit and the non - inverting input terminal of the first operational amplifier are connected.

[0015] Preferably, the current mirror unit is composed of a third PMOS transistor M5 and a third NMOS transistor M4; wherein, the gate of the third NMOS transistor M4 is connected to the gate of the second NMOS transistor M3 in the noise feedback unit and the output terminal of the first operational amplifier; the source of the third NMOS transistor M4 is connected to the ground potential terminal GND, the drain of the third NMOS transistor M4 is connected to the drain of the third PMOS transistor M5, the source of the third PMOS transistor M5 is connected to the power supply terminal VDD, and the gate of the third PMOS transistor M5 is short - circuited with the drain and then connected to the gate of the fifth PMOS transistor M9 in the load output unit.

[0016] Preferably, the load output unit is composed of a fifth PMOS transistor M9 and a load circuit, namely a current - controlled oscillator; wherein, the gate of the fifth PMOS transistor M9 is connected to the gate of the third PMOS transistor M5 in the current mirror unit, the source of the fifth PMOS transistor M9 is connected to the power supply terminal VDD, and the drain of the fifth PMOS transistor M9 is used as the output terminal and is connected to the load circuit.

[0017] Preferably, the noise feedback unit consists of a second NMOS transistor M3 and a first operational amplifier. The source of the second NMOS transistor M3 is connected to the ground potential terminal GND. The drain of the second NMOS transistor M3 is connected to the non-inverting input terminal of the first operational amplifier and the drain of the second PMOS transistor M1 in the self-biased current source. The gate of the second NMOS transistor M3 is connected to the output terminal of the first operational amplifier and the gate of the first NMOS transistor M2 in the self-biased current source. At the same time, the output terminal of the first operational amplifier is also connected to the gate of the third NMOS transistor M4 in the current mirror unit, and the inverting input terminal of the first operational amplifier is connected to the drain of the fourth PMOS transistor M6 in the noise sensing unit.

[0018] Preferably, the noise sensing unit consists of a fourth PMOS transistor M6, a fourth NMOS transistor M7, and a fifth NMOS transistor M8. The source of the fourth PMOS transistor M6 is connected to the power supply terminal. The gate and drain of the fourth PMOS transistor M6 are short-circuited and connected to the drain of the fourth NMOS transistor M7 on the one hand and the inverting input terminal of the first operational amplifier in the noise feedback unit on the other hand. The source of the fourth NMOS transistor M7 is connected to the drain of the fifth NMOS transistor M8. The source of the fifth NMOS transistor M8 is connected to the ground potential terminal GND. The gate of the fifth NMOS transistor M8 is connected to the bias voltage terminal VB1, and the gate of the fourth NMOS transistor M7 is connected to the bias voltage terminal VB2.

[0019] Preferably, the first resistor R1 and the second PMOS transistor M1 in the self-biased current source form a first sampling voltage branch to sample the fluctuating voltage caused by the power supply terminal noise and input it to the noise feedback unit.

[0020] Preferably, the fourth PMOS transistor M6 branch in the noise sensing unit serves as a second sampling voltage branch to sample the fluctuating voltage caused by the power supply terminal noise and input it to the noise feedback unit.

[0021] Preferably, by increasing the gain of the operational amplifier in the low-frequency band, the noise suppression effect is improved.

[0022] Preferably, by increasing the bandwidth of the negative feedback loop of the operational amplifier, the noise suppression effect is improved.

[0023] According to the second aspect of the embodiments of the present invention, a current numerically controlled oscillator is provided, which includes the above-mentioned power supply noise suppression circuit.

[0024] According to the third aspect of the embodiments of the present invention, an electronic device is provided, which includes the above-mentioned current numerically controlled oscillator.

[0025] Compared with the prior art, the power supply noise suppression circuit and the corresponding current numerically controlled oscillator provided by the present invention utilize the working principle of a constant current source. The fluctuating voltage generated at the power supply terminal due to external circuit noise is canceled out after being fed back through two paths of noise, ensuring that the output load current is not affected by the fluctuating voltage, thereby effectively suppressing the power supply noise and enabling the current numerically controlled oscillator to meet the requirements of system performance. Therefore, the power supply noise suppression circuit and the corresponding current numerically controlled oscillator provided by the present invention have beneficial effects such as ingenious and reasonable circuit design, low production cost, and excellent system performance. Description of the Drawings

[0026] Figure 1 FIG. is a schematic diagram of a typical current numerically controlled oscillator with a self - biasing current source in the prior art;

[0027] Figure 2 FIG. is a circuit schematic diagram of a current numerically controlled oscillator with a self - biasing current source under ideal conditions;

[0028] Figure 3 FIG. is a schematic diagram of a current numerically controlled oscillator with a power supply noise suppression circuit in an embodiment of the present invention;

[0029] Figure 4 FIG. is a schematic diagram for comparing the sensitivity simulation test results of a current numerically controlled oscillator in an embodiment of the present invention.

[0030] Figure 5 FIG. is an example diagram of an electronic device using the power supply noise suppression circuit provided by the present invention. Detailed Embodiments

[0031] The technical solutions of the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0032] As Figure 1 shown, a typical current numerically controlled oscillator with a self - biasing current source in the prior art includes three parts: a self - biasing current source, a current mirror part, and a load circuit. Among them, the load circuit is the current numerically controlled oscillator.

[0033] Assume that due to the noise coupled to the power supply from other modules in the current-controlled oscillator, a voltage fluctuation Vn is generated in the power supply. This voltage fluctuation Vn will be transmitted along the low-resistance path formed by resistor R1 and PMOS transistor M1 to the drain of NMOS transistor M3 and form a fluctuating voltage Va. Since the drain and gate of NMOS transistor M3 are shorted together, the fluctuating voltage Va is also transmitted to the gate of NMOS transistor M3 and the gate of its mirror NMOS transistor M4, and a fluctuating voltage Vb is generated at the drain of NMOS transistor M4. The NMOS transistor M4 forms a common-source amplifier circuit from the gate to the drain. At small signals, Va and Vb are in an anti-correlated relationship. Therefore, for PMOS transistor M5, its source-gate voltage Vsg (Vsg = Vn - Vb) will also fluctuate with the fluctuation of the noise voltage Vn, and a noise current ΔI is generated in its branch on the basis of the DC bias. n1 ; PMOS transistor M5 and PMOS transistor M6 of the load circuit are in a current mirror structure. Therefore, a noise current ΔI will also be generated in the branch where PMOS transistor M6 is located. n2 This noise current ΔI n2 will be injected into the load circuit, causing the current-controlled oscillator to be severely disturbed with the fluctuation of the power supply voltage.

[0034] For this reason, the present invention first provides a power supply noise suppression circuit for a current-controlled oscillator to eliminate or reduce the interference of power supply noise on the current-controlled oscillator. The specific description is as follows:

[0035] In Figure 2 the ideal case shown, an ideal current-controlled oscillator with a self-biased current source includes an ideal current source Iref, NMOS transistors M0 and M1, PMOS transistors M2 and M3, and a load circuit. Among them, NMOS transistors M0 and M1, PMOS transistors M2 and M3 are all in a current mirror transistor structure, and NMOS transistor M0 and PMOS transistor M2 are in a diode-connected manner. This ideal current-controlled oscillator with a self-biased current source has a power supply noise suppression function, and its working principle is described as follows:

[0036] When the MOS transistor is in the saturation region of operation, the drain current Id is:

[0037]

[0038] Among them, μ is the electron mobility of the MOS transistor; C ox is the gate oxide capacitance per unit area of the MOS transistor; is the width-to-length ratio of the MOS transistor; V gs is the gate-source voltage of the MOS transistor; V ds is the drain-source voltage of the MOS transistor; V this the threshold voltage for forming the channel; λ is the channel modulation coefficient.

[0039] When not considering the channel modulation effect, the drain current Id of the MOS transistor in the saturation region of operation is:

[0040]

[0041] It can be seen from Equation 1 and Equation 2 that for the interference from the power supply noise affecting the source voltage Vs of the MOS transistor, if there is an identical interference applied to the gate of the MOS transistor such that ΔVgs = 0, then the interference from the power supply noise can be eliminated. Thus, the load current obtained by mirroring is also free from the perturbation of the power supply noise. The specific situation is as follows:

[0042] The ideal current source Iref passes through the current mirror circuit to obtain the bias currents Ibias1 and Ibias2 in the mirror branch and the load branch respectively. Among them, Ibias2 is the injection current of the load circuit, i.e., the ideal current-controlled oscillator, and this current determines the oscillation frequency of the current-controlled oscillator.

[0043] Assume that under the bias of the ideal current source, the power supply VDD has a fluctuating voltage Vn generated by the noise from an external circuit. Since in the ideal current source Iref branch, the gate-drain voltages of the NMOS transistor M0 are constantly equal, the gate voltage Va of M0 remains nearly constant. Therefore, an approximately constant current bias Ibias1 is provided for the NMOS transistor M1. For the PMOS transistor M2, since the branch current Ibias1 is approximately constant, the source-gate voltage V gs of the PMOS transistor M2 also remains constant, that is, the gate of the PMOS transistor M2 also has the same noise fluctuation as the power supply voltage VDD. At this time, the noise currents ΔI n1 and ΔI n2 in the mirror branch and the load branch are close to zero, i.e., ΔI n1 = ΔI n2 ≈0.

[0044] Based on the operating principle of the above-described ideal current-controlled oscillator with a self-biased current source, the embodiments of the present invention first provide a power supply noise suppression circuit for a current-controlled oscillator, as Figure 3 shown. The power supply noise suppression circuit includes five parts: a self-biased current source, a noise feedback unit, a current mirror unit, a noise sensing unit, and a load output unit.

[0045] Among them, the self - bias current source provides a sampling voltage of the voltage fluctuation caused by the noise at the first power supply terminal for the noise feedback unit; the noise sensing unit provides a sampling voltage of the voltage fluctuation caused by the noise at the second power supply terminal for the noise feedback unit; the noise feedback unit cancels the noise fluctuation voltages in the two input sampling voltages and outputs a stable voltage and a stable current; the current mirror unit performs current mirror replication on the stable current and outputs it to the load output unit; the load output unit provides a stable output current for the load circuit.

[0046] The self - bias current source unit is composed of a first PMOS transistor M0, a second PMOS transistor M1, a first NMOS transistor M2, and a first resistor R1; the noise feedback unit is composed of a second NMOS transistor M3 and a first operational amplifier; the current mirror unit is composed of a third PMOS transistor M5 and a third NMOS transistor M4; the noise sensing unit is composed of a fourth PMOS transistor M6, a fourth NMOS transistor M7, and a fifth NMOS transistor M8; the load output unit is composed of a fifth PMOS transistor M9 and a load circuit (current numerically - controlled oscillator).

[0047] The source of the first PMOS transistor M0 is connected to the power supply terminal VDD. The gate and the drain of the first PMOS transistor M0 are short-circuited and then connected to the gate of the second PMOS transistor M1. The drain of the first PMOS transistor M0 is connected to the drain of the first NMOS transistor M2. The source of the first NMOS transistor M2 is connected to the ground potential terminal GND. The gate of the first NMOS transistor M2 is connected to the gate of the second NMOS transistor M3 and the output terminal of the first operational amplifier. The source of the second NMOS transistor M3 is connected to the ground potential terminal GND. The drain of the second NMOS transistor M3 is connected to the drain of the second PMOS transistor M1 and the non-inverting input terminal of the first operational amplifier. The source of the second PMOS transistor M1 is connected to the first resistor R1. The other end of the first resistor R1 is connected to the power supply terminal VDD. The inverting input terminal of the first operational amplifier is connected to the drain of the fourth PMOS transistor M6. At the same time, the output terminal of the first operational amplifier is also connected to the gate of the third NMOS transistor M4. The source of the third NMOS transistor M4 is connected to the ground potential terminal GND. The drain of the third NMOS transistor M4 is connected to the drain of the third PMOS transistor M5. The gate and the drain of the third PMOS transistor M5 are short-circuited and then connected to the gate of the fifth PMOS transistor M9. The source of the third PMOS transistor M5 is connected to the power supply terminal VDD. The source of the fifth PMOS transistor M9 is connected to the power supply terminal VDD. The drain of the fifth PMOS transistor M9 is connected to the load circuit. In addition, the source of the fourth PMOS transistor M6 is connected to the power supply. The gate and the drain of the fourth PMOS transistor M6 are short-circuited and are connected to the inverting input terminal of the first operational amplifier on one hand and the drain of the fourth NMOS transistor M7 on the other hand. The source of the fourth NMOS transistor M7 is connected to the drain of the fifth NMOS transistor M8. The source of the fifth NMOS transistor M8 is connected to the ground potential terminal GND. The gate of the fifth NMOS transistor M8 is connected to the bias voltage terminal VB1. The gate of the fourth NMOS transistor M7 is connected to the bias voltage terminal VB2.

[0048] For the power supply noise suppression circuit for a current numerically controlled oscillator provided by the embodiment of the present invention, the working process of suppressing the noise at the power supply terminal is as follows:

[0049] When the power supply VDD generates a fluctuating voltage Vn due to noise from an external circuit, a low-resistance path formed by the first resistor R1 and the second PMOS transistor M1 generates a fluctuating voltage Vb at the drain of the second PMOS transistor M1, and inputs this fluctuating voltage Vb to the non-inverting input terminal of the first operational amplifier; the fluctuating voltage Vn passes through the path of the fourth PMOS transistor M6 of the noise sensing unit to generate a fluctuating voltage Va at the drain of the fourth PMOS transistor M6, and inputs this fluctuating voltage Vb to the inverting input terminal of the first operational amplifier; under the differential-mode input of the first operational amplifier, the noise fluctuations of the voltage signals at the non-inverting input terminal and the inverting input terminal are eliminated, and a relatively stable output voltage Vg is obtained at the output terminal of the first operational amplifier. This stable voltage Vg is the gate voltage of the second NMOS transistor M3, so a relatively stable current will be generated, and its current component does not include a noise current, which is equivalent to an approximately constant current bias. Through the current mirroring of the second NMOS transistor M3 and the third NMOS transistor M4, the diode-connected third PMOS transistor M5 in the current mirroring unit has a constant gate-source voltage V gs keeps constant, that is, the gate of the third PMOS transistor M5 also has the same noise fluctuation as the power supply voltage VDD. Therefore, the noise current ΔI n1 in the branch circuit of the third PMOS transistor M5 in the current mirroring unit is close to zero. Similarly, since the third PMOS transistor M5 and the fifth PMOS transistor M9 in the load output unit form a current mirror structure, the noise current ΔI n2 in the branch of the fifth PMOS transistor M9 (i.e., the load circuit) is also close to zero. Therefore, the noise current in the load circuit is suppressed.

[0050] The branch composed of the fourth NMOS transistor M7 and the fifth NMOS transistor M8 in the noise sensing unit provides a static DC bias voltage for the noise sensing unit through the bias voltage VB1 and the bias voltage VB2. Among them, both the bias voltage VB1 and the bias voltage VB2 are relatively constant bias voltage sources.

[0051] In addition, by reasonably designing the component parameters of the operational amplifier in the noise feedback unit, increasing the gain of the operational amplifier in the low-frequency band and increasing the bandwidth of its negative feedback loop, the noise suppression effect of this power supply noise suppression circuit can be further improved.

[0052] In order to verify the excellent performance of the power supply noise suppression circuit and the corresponding current numerically controlled oscillator provided by the embodiments of the present invention, the inventors carried out simulation tests on the power supply sensitivity of the Figure 1 shown prior art solution (without noise suppression) and the Figure 3 shown technical solution of the present invention respectively.

[0053] The simulation test results are asFigure 4 As shown in the figure, the abscissa in the figure is the frequency of the current-controlled oscillator, and the ordinate is the power supply sensitivity (ΔIout / ΔVDD) of the current-controlled oscillator, where ΔIout is the change in the output current and ΔVDD is the change in the power supply voltage.

[0054] From Figure 4 it can be seen that in the frequency range of 0 to 10,000 Hz, compared with the prior art solution, the current-controlled oscillator with a power supply noise suppression circuit provided by the invention embodiment has a power supply sensitivity (ΔIout / ΔVDD) increased by 36 dB, indicating that the technical solution of the present invention has a very obvious effect on noise suppression.

[0055] In addition, the embodiment of the present invention also provides an electronic device, which includes the above-mentioned current-controlled oscillator with a power supply noise suppression circuit. As Figure 5 shown, the electronic device at least includes a processor and a memory, and may further include a communication component, a sensor component, a power supply component, a multimedia component, and an input / output interface according to actual needs. Among them, the memory, the communication component, the sensor component, the power supply component, the multimedia component, and the input / output interface are all connected to the processor. The memory may be a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic memory, a flash memory, etc., and the processor may be a central processing unit (CPU), a graphics processing unit (GPU), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a digital signal processing (DSP) chip, etc. Other communication components, sensor components, power supply components, multimedia components, etc. can all be implemented by general components, and will not be specifically described here.

[0056] From the specific description of the technical solution of the present invention through the above embodiments, it can be seen that for the power supply noise suppression circuit and the corresponding current-controlled oscillator provided by the present invention, by using the working principle of the constant current source, the fluctuating voltage generated at the power supply end due to external circuit noise is mutually cancelled after being fed back through two paths of noise, ensuring that the output load current is not affected by the fluctuating voltage, thereby effectively suppressing the power supply noise and enabling the current-controlled oscillator to meet the requirements of system performance. Therefore, the power supply noise suppression circuit and the corresponding current-controlled oscillator provided by the present invention have beneficial effects such as ingenious and reasonable structural design, low production cost, and excellent system performance.

[0057] The above has described in detail the power supply noise suppression circuit, the corresponding current numerically controlled oscillator, and the electronic device provided by the present invention. For those of ordinary skill in the art, any obvious changes made to it without departing from the essential content of the present invention will fall within the protection scope of the patent right of the present invention.

Claims

1. A power supply noise suppression circuit for a current-controlled oscillator, comprising a self-biased current source, a current mirror unit, and a load output unit, characterized by further comprising a noise feedback unit and a noise sensing unit; wherein, The self-biased current source provides a sampling voltage of the voltage fluctuation caused by the noise at the first power supply terminal for the noise feedback unit; The noise sensing unit provides a sampling voltage of the voltage fluctuation caused by the noise at the second power supply terminal for the noise feedback unit; The noise feedback unit cancels the noise fluctuation voltages in the two input sampling voltages and outputs a stable current; The noise feedback unit is composed of a second NMOS transistor and a first operational amplifier; wherein, the source of the second NMOS transistor is connected to the ground potential terminal GND, the drain of the second NMOS transistor is connected to the non-inverting input terminal of the first operational amplifier and the drain of the second PMOS transistor in the self-biased current source; the gate of the second NMOS transistor is connected to the output terminal of the first operational amplifier and the gate of the first NMOS transistor in the self-biased current source. At the same time, the output terminal of the first operational amplifier is also connected to the gate of the third NMOS transistor in the current mirror unit, and the inverting input terminal of the first operational amplifier is connected to the drain of the fourth PMOS transistor in the noise sensing unit; The current mirror unit performs current mirror replication on the stable current and outputs it to the load output unit; The load output unit provides a stable output current for the load circuit.

2. The power supply noise suppression circuit for a current-controlled oscillator according to claim 1, characterized in that: The self-biased current source is composed of a first PMOS transistor, a second PMOS transistor, a first NMOS transistor, and a first resistor; wherein, the source of the first PMOS transistor is connected to the power supply terminal VDD, the gate of the first PMOS transistor is shorted to the drain and then connected to the gate of the second PMOS transistor; the drain of the first PMOS transistor is connected to the drain of the first NMOS transistor, the source of the first NMOS transistor is connected to the ground potential terminal GND, and the gate of the first NMOS transistor is connected to the gate of the second NMOS transistor in the noise feedback unit and the output terminal of the first operational amplifier; the first resistor is connected to the power supply terminal VDD, the other end of the first resistor is connected to the source of the second PMOS transistor, and the drain of the second PMOS transistor, the drain of the second NMOS transistor in the noise feedback unit, and the non-inverting input terminal of the first operational amplifier are connected.

3. The power supply noise suppression circuit for a current-controlled oscillator according to claim 1, characterized in that: The current mirror unit is composed of a third PMOS transistor and a third NMOS transistor; wherein, the gate of the third NMOS transistor is connected to the gate of the second NMOS transistor in the noise feedback unit and the output terminal of the first operational amplifier; the source of the third NMOS transistor is connected to the ground potential terminal GND, the drain of the third NMOS transistor is connected to the drain of the third PMOS transistor, the source of the third PMOS transistor is connected to the power supply terminal VDD, and the gate of the third PMOS transistor is shorted to the drain and then connected to the gate of the fifth PMOS transistor in the load output unit.

4. The power supply noise suppression circuit for a current-controlled oscillator according to claim 1, characterized in that: The load output unit is composed of a fifth PMOS transistor and a load circuit; wherein, the gate of the fifth PMOS transistor is connected to the gate of the third PMOS transistor in the current mirror unit, the source of the fifth PMOS transistor is connected to the power supply terminal VDD, and the drain of the fifth PMOS transistor is used as the output terminal and connected to the load circuit.

5. The power supply noise suppression circuit for a current-controlled oscillator according to claim 1, characterized in that: The noise sensing unit is composed of a fourth PMOS transistor, a fourth NMOS transistor and a fifth NMOS transistor; wherein, the source of the fourth PMOS transistor is connected to the power supply terminal, the gate and the drain of the fourth PMOS transistor are short-circuited and on the one hand connected to the drain of the fourth NMOS transistor, and on the other hand connected to the inverting input terminal of the first operational amplifier in the noise feedback unit, the source of the fourth NMOS transistor is connected to the drain of the fifth NMOS transistor, the source of the fifth NMOS transistor is connected to the ground potential terminal GND, the gate of the fifth NMOS transistor is connected to the first bias voltage terminal, and the gate of the fourth NMOS transistor is connected to the second bias voltage terminal.

6. The power supply noise suppression circuit for a current-controlled oscillator according to claim 2, characterized in that: The first resistor and the second PMOS transistor in the self-biased current source form a first sampling voltage branch, sample the fluctuating voltage caused by the power supply terminal noise and input it to the noise feedback unit.

7. The power supply noise suppression circuit for a current-controlled oscillator according to claim 5, characterized in that: The fourth PMOS transistor branch in the noise sensing unit serves as a second sampling voltage branch, samples the fluctuating voltage caused by the power supply terminal noise and inputs it to the noise feedback unit.

8. A current numerically controlled oscillator, characterized in that Comprising the power supply noise suppression circuit for a current-controlled oscillator according to any one of claims 1 to 7.

9. An electronic device, characterized in that Comprising the power supply noise suppression circuit for a current-controlled oscillator according to any one of claims 1 to 7.

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