CN114337547A - Low-power consumption crystal oscillator circuit and corresponding electronic equipment - Google Patents
Low-power consumption crystal oscillator circuit and corresponding electronic equipment Download PDFInfo
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Abstract
The invention discloses a low-power-consumption crystal oscillator circuit and corresponding electronic equipment. The low-power-consumption crystal oscillator circuit comprises a current source unit, a crystal circuit unit and an auxiliary current source unit. The output end of the current source unit and the output end of the auxiliary current source unit are respectively connected with the crystal circuit unit, the current source unit provides accelerated oscillation starting current for the crystal circuit unit, the auxiliary current source unit provides initial oscillation starting current for the crystal circuit unit, and the crystal circuit unit provides clock signals for a digital circuit or an analog circuit. The low-power-consumption crystal oscillator circuit provided by the invention not only meets the technical requirements of quick oscillation starting and low-power-consumption work, but also has higher anti-interference capability, and the low-power-consumption crystal oscillator circuit can avoid the oscillation phenomenon of output signals in the oscillation starting process through the optimization of the circuit structure design, and has the beneficial effects of simple and ingenious circuit design, reliable performance and the like.
Description
Technical Field
The invention relates to a low-power-consumption crystal oscillator circuit, and also relates to electronic equipment adopting the low-power-consumption crystal oscillator circuit, belonging to the technical field of analog electronics.
Background
A crystal oscillator is an abbreviation of a quartz crystal oscillator, and is one of the most important components of a crystal oscillator circuit (also called a clock circuit). With the rapid development of communication technology in recent years, the requirement on the technical index of the crystal oscillator circuit is higher and higher, and the crystal oscillator circuit is generally required to realize rapid oscillation starting and low power consumption operation.
In the prior art, in order to meet the requirement of fast oscillation starting, a technical scheme of injecting a clock signal is generally adopted in a crystal oscillation circuit. The technical scheme is that a clock signal with the frequency equal to or close to the frequency of the crystal oscillator is injected into the output end of the crystal oscillator circuit, and the crystal oscillator circuit is driven to start oscillation rapidly through injection of the similar clock frequency. Although the technical scheme accelerates the oscillation starting amplitude of the crystal oscillation circuit and shortens the oscillation starting time, the crystal oscillation circuit needs a built-in RC oscillator and can only accelerate the period of time just after oscillation starting.
On the other hand, in order to meet the requirement of low power consumption, a technical scheme of a fixed current type current source is generally adopted to reduce the current of the crystal oscillator. Although the technical scheme reduces the power consumption of the crystal oscillator, the oscillation starting time is longer. In addition, a technical scheme of adopting a dynamic adjustment current type current source is adopted, so that a larger current can be provided to improve the oscillation starting speed of the crystal oscillator when the crystal oscillator starts oscillation, the signal amplitude of the output end of the crystal oscillator circuit is automatically detected when the crystal oscillator amplitude reaches a certain value, and the signal amplitude is suppressed to a certain amplitude value through dynamic adjustment. Although the technical scheme can meet the requirements of quick oscillation starting and low-power consumption work, two serious problems exist due to the reasons of circuit structure, device selection and the like: firstly, the amplitude of the output crystal oscillator voltage is too low, so that the anti-interference capability of a crystal oscillator circuit is poor; secondly, when the dynamic adjustment is too sensitive, the output signal of the crystal oscillator is easy to oscillate.
In the patent of the invention in china with the publication number CN103095253B, a low power consumption crystal oscillator circuit is disclosed, which comprises a crystal oscillator circuit module, wherein a gate end of a PMOS transistor Mp1 and a gate end of an NMOS transistor Mn1 which form a phase inverter in the crystal oscillator circuit module are connected in series with a capacitor C1, the crystal oscillator circuit module is connected with a current mirror module through a large resistor R2, and the current mirror module provides a voltage which is lower than a high power supply by one PMOS transistor threshold value to the gate end of the PMOS transistor Mp 1. In the low-power-consumption crystal oscillator circuit, series capacitors are added to the grid ends of two transistors forming the phase inverter, and a bias voltage is generated through the current mirror module, so that the PMOS tube is biased by the threshold value of one PMOS tube, and the NMOS tube is biased by the threshold value of one NMOS tube, therefore, the starting voltage of the phase inverter is lower than the sum of the threshold values of the PMOS tube and the NMOS tube, and the current consumed by the whole circuit is small.
Disclosure of Invention
The invention provides a low-power crystal oscillator circuit.
Another object of the present invention is to provide an electronic device using the low power consumption crystal oscillator circuit.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to a first aspect of the embodiments of the present invention, there is provided a low power consumption crystal oscillator circuit, including a current source unit, a crystal circuit unit, and an auxiliary current source unit; wherein the content of the first and second substances,
the current source unit and the auxiliary current source unit are respectively connected with the crystal circuit unit;
the current source unit provides accelerated oscillation starting current for the crystal circuit unit, the auxiliary current source unit provides initial oscillation starting current for the crystal circuit unit, and the crystal circuit unit provides clock signals to the outside.
Preferably, the current source unit consists of a first PMOS transistor PM0, a second PMOS transistor PM1, a first NMOS transistor NM0, a second NMOS transistor NM1, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor and a third capacitor; wherein, the source of the first NMOS transistor NM0 is connected to the ground terminal through the fourth resistor, the gate of the first NMOS transistor NM0 is connected to the first resistor on the one hand, and is connected to the output terminal XI of the crystal oscillator circuit through the second capacitor on the other hand, the other end of the first resistor is connected to the drain of the first NMOS transistor NM0, the drain of the first NMOS transistor NM0 is further connected to the first capacitor, the second resistor and the source of the first PMOS transistor PM0 respectively, the other end of the first capacitor is connected to the ground terminal, the other end of the second resistor is connected to the third capacitor and the gate of the second NMOS transistor NM1, the drain of the first PMOS transistor PM0 is connected to the power terminal Vdd, the gate of the first PMOS transistor PM0 is connected to the gate of the second PMOS transistor PM1, the drain of the second PMOS transistor PM1 is connected to the power terminal Vdd, the gate of the second PMOS transistor PM1 is connected to the source, the source of the second PMOS transistor PM1 is connected to the drain of the second NMOS transistor NM1 and the gate of the third PMOS transistor PM2 respectively, the source of the second NMOS transistor NM1 is connected to the ground terminal through a third resistor, and the other end of the third capacitor is connected to the ground terminal.
Preferably, the crystal circuit unit is composed of a third PMOS transistor PM2, a fourth PMOS transistor PM3, a third NMOS transistor NM3, a fifth resistor and a crystal oscillator; the grid of the third PMOS transistor PM2 is connected to the source of the second PMOS transistor PM1 of the current source unit, the drain of the third PMOS transistor PM2 is connected to the power supply terminal Vdd, the source of the third PMOS transistor PM2 is connected to the source of the fifth PMOS transistor PM4 of the auxiliary current source unit on the one hand and to the drain of the fourth PMOS transistor PM3 on the other hand, the grid of the fourth PMOS transistor PM3 is connected to the output terminal XI of the crystal oscillator circuit on the one hand and to the grid of the fifth resistor and the third NMOS transistor NM3 on the other hand, the source of the fourth PMOS transistor PM3 is connected to the output terminal XO of the crystal oscillator circuit on the one hand and to the other end of the fifth resistor and the drain of the third NMOS transistor NM3 on the other hand, the source of the third NMOS transistor NM3 is connected to the ground terminal, and the two ends of the crystal are connected to the output terminals XI and XO of the crystal oscillator circuit respectively.
Preferably, the auxiliary current source unit consists of a fifth PMOS transistor PM4, a sixth PMOS transistor PM5 and a current source Idc; the source of the fifth PMOS transistor PM4 is connected to the source of the third PMOS transistor PM2 of the transistor unit, the drain of the fifth PMOS transistor PM4 is connected to the power supply terminal Vdd, the gate of the fifth PMOS transistor PM4 is connected to the gate of the sixth PMOS transistor PM5, the gate of the sixth PMOS transistor PM5 is connected to the source, the drain of the sixth PMOS transistor PM5 is connected to the power supply terminal Vdd, the source of the sixth PMOS transistor PM5 is connected to the current source Idc, and the other end of the current source Idc is connected to the ground.
Preferably, after the power supply terminal Vdd is powered on, when no output signal is provided at the output terminals XI and XO of the crystal oscillator circuit, the current source circuit formed by the first PMOS transistor PM0, the second PMOS transistor PM1, the first NMOS transistor NM0, the second NMOS transistor NM1, and the third resistor generates a large current, where the branch current of the first PMOS transistor PM0 is I0, the branch current of the second PMOS transistor PM1 is I1, and I0 is I1.
Preferably, the third PMOS transistor PM2 amplifies the branch current I1 by several times to form a branch current I2, and provides the branch current I2 to the crystal oscillator circuit formed by the fourth PMOS transistor PM3, the third NMOS transistor NM3 and the fifth resistor.
Preferably, the current source Idc and the branch current I5 generated by the branch of the sixth PMOS transistor PM5 are mirrored by the fifth PMOS transistor PM4 to form a branch current I4, which is provided to the crystal oscillator circuit formed by the fourth PMOS transistor PM3, the third NMOS transistor NM3 and the fifth resistor.
Preferably, when the gate voltage V0 of the first NMOS transistor NM0 increases, the junction voltage Vgs increases, so that the branch current I6 flowing through the first NMOS transistor NM0 increases rapidly, and the voltage V3 on the fourth resistor also increases, so that the increase of the junction voltage Vgs of the first NMOS transistor NM0 is suppressed.
Preferably, when the amplitude of the signal at the output terminal XI of the crystal oscillator circuit increases to a predetermined amplitude, the signal at the output terminal XI of the crystal oscillator circuit is superimposed on the gate voltage V0 of the first NMOS transistor NM0 through the feedback path of the second capacitor, so as to form a negative feedback structure.
According to a second aspect of the embodiments of the present invention, an electronic device is provided, which includes the low power consumption crystal oscillator circuit.
Compared with the prior art, the low-power-consumption crystal oscillator circuit provided by the invention not only meets the technical requirements of quick oscillation starting and low-power-consumption work, but also has higher anti-interference capability, and the oscillation phenomenon of output signals can be avoided in the oscillation starting process of the low-power-consumption crystal oscillator circuit through the optimization of the circuit structure design, so that the low-power-consumption crystal oscillator circuit has the beneficial effects of simple and ingenious circuit design, reliable performance and the like.
Drawings
Fig. 1 is a schematic circuit diagram of a low power consumption crystal oscillator circuit according to an embodiment of the present invention;
FIG. 2(a) is a waveform diagram of an output signal of a crystal oscillator circuit in the prior art;
FIG. 2(b) is a schematic waveform diagram of an output signal of a low power consumption crystal oscillator circuit according to an embodiment of the present invention;
fig. 3 is a diagram illustrating an example of an electronic device using the low power crystal oscillator circuit of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the low power consumption crystal oscillator circuit provided by the embodiment of the invention includes a current source unit, a crystal circuit unit, and an auxiliary current source unit. The output end of the current source unit and the output end of the auxiliary current source unit are respectively connected with the crystal circuit unit. The current source unit mainly provides accelerated oscillation starting current for the crystal circuit unit, the auxiliary current source unit mainly provides initial oscillation starting current for the crystal circuit unit, and the crystal circuit unit mainly provides clock signals for an external digital circuit or an external analog circuit.
In an embodiment of the present invention, the current source unit is composed of a first PMOS transistor PM0, a second PMOS transistor PM1, a first NMOS transistor NM0, a second NMOS transistor NM1, a first resistor R0, a second resistor R1, a third resistor R2, a fourth resistor R3, a first capacitor C0, a second capacitor C1, and a third capacitor C2. The first PMOS transistor PM0, the second PMOS transistor PM1, the first NMOS transistor NM0, the second NMOS transistor NM1 and the third resistor R2 form a current source circuit.
Specifically, the source of the first NMOS transistor NM0 is connected to the ground through the fourth resistor R3, the gate of the first NMOS transistor NM0 is connected to the first resistor R0 on the one hand, and to the output terminal XI of the crystal oscillator circuit through the second capacitor C1 on the other hand, the other end of the first resistor R0 is connected to the drain of the first NMOS transistor NM0, the drain of the first NMOS transistor NM0 is further connected to the sources of the first capacitor C0, the second resistor R1 and the first PMOS transistor PM0, the other end of the first capacitor C0 is connected to the ground, the other end of the second resistor R1 is connected to the gates of the third capacitor C2 and the second NMOS transistor NM1, the drain of the first PMOS transistor PM0 is connected to the power supply terminal Vdd, the gate of the first PMOS transistor PM0 is connected to the gate of the second PMOS transistor PM1, the drain of the second PMOS transistor PM1 is connected to the drain of the PMOS transistor PM1, the gate of the second PMOS transistor NM1 is connected to the source of the PMOS transistor PM1, the drain of the second PMOS transistor PM 599 and the drain of the second PMOS transistor PM 599, the source of the second NMOS transistor NM1 is connected to the ground terminal through a third resistor R2, and the other end of the third capacitor C2 is connected to the ground terminal.
In one embodiment of the present invention, the crystal circuit unit is composed of a third PMOS transistor PM2, a fourth PMOS transistor PM3, a third NMOS transistor NM3, a fifth resistor R, and a crystal oscillator. The fourth PMOS transistor PM3, the third NMOS transistor NM3, and the fifth resistor R form a crystal oscillator circuit.
Specifically, the gate of the third PMOS transistor PM2 is connected to the source of the second PMOS transistor PM1 of the current source unit, the drain of the third PMOS transistor PM2 is connected to the power supply terminal Vdd, the source of the third PMOS transistor PM2 is connected to the source of the fifth PMOS transistor PM4 of the auxiliary current source unit on the one hand and the drain of the fourth PMOS transistor PM3 on the other hand, the gate of the fourth PMOS transistor PM3 is connected to the output terminal XI of the crystal oscillator circuit on the one hand and the gates of the fifth resistor R and the third NMOS transistor NM3 on the other hand, the source of the fourth PMOS transistor PM3 is connected to the output terminal XO of the crystal oscillator circuit on the one hand and the other end of the fifth resistor R and the drain of the third NMOS transistor NM3 on the other hand, the source of the third NMOS transistor NM3 is connected to the ground, and both ends of the crystal are connected to the output terminal XI and XO of the crystal oscillator circuit, respectively.
In one embodiment of the present invention, the auxiliary current source unit is composed of a fifth PMOS transistor PM4, a sixth PMOS transistor PM5, and a current source Idc. The fifth PMOS transistor PM4 and the sixth PMOS transistor PM5 form a current mirror structure.
Specifically, the source of the fifth PMOS transistor PM4 is connected to the source of the third PMOS transistor PM2, the drain of the fifth PMOS transistor PM4 is connected to the power supply terminal Vdd, the gate of the fifth PMOS transistor PM4 is connected to the gate of the sixth PMOS transistor PM5, the gate of the sixth PMOS transistor PM5 is connected to the source, the drain of the sixth PMOS transistor PM5 is connected to the power supply terminal Vdd, the source of the sixth PMOS transistor PM5 is connected to the current source Idc, and the other end of the current source Idc is connected to the ground.
The working principle of the low-power-consumption crystal oscillator circuit provided by the embodiment is as follows:
as shown in fig. 1, after the power supply terminal Vdd is powered on, when there is no output signal at the output terminals XI and XO of the crystal oscillator circuit, the current source circuit composed of the first PMOS transistor PM0, the second PMOS transistor PM1, the first NMOS transistor NM0, the second NMOS transistor NM1, and the third resistor R2 generates a large current, where the branch current of the first PMOS transistor PM0 is I0, the branch current of the second PMOS transistor PM1 is I1, and I0 is I1, and the branch current I1 is amplified by the third PMOS transistor PM2 to form a branch current I2, which is provided to the crystal oscillator circuit composed of the fourth PMOS transistor PM3, the third NMOS transistor NM3, and the fifth resistor R. Meanwhile, in the auxiliary current source unit, a current source Idc and a branch current I5 generated by a branch of a sixth PMOS transistor PM5 are mirrored by a fifth PMOS transistor PM4 to form a branch current I4, and the branch current I4 is also provided for a crystal oscillator circuit composed of a fourth PMOS transistor PM3, a third NMOS transistor NM3 and a fifth resistor R, at this time, the branch current of the crystal oscillator circuit is I2+ I4, and a large current I2+ I4 enables the crystal oscillator to start oscillation rapidly, and the signal amplitudes at the output terminals XI and XO of the crystal oscillator circuit reach a certain amplitude value rapidly.
When the amplitude of the signal at the output terminal XI of the crystal oscillator circuit increases to a predetermined amplitude, the signal at the output terminal XI of the crystal oscillator circuit is superimposed on the gate voltage V0 of the first NMOS transistor NM0 through the feedback path of the second capacitor C1, forming a negative feedback structure. The current source with the negative feedback structure maintains the original balance, the drain voltage V1 of the first NMOS tube NM0 is reduced, the gate voltage V2 of the second NMOS tube NM1 is reduced, the whole current of the current source, namely the branch current I1 of the second PMOS tube PM1 is reduced, and the branch current I2 formed after the current I1 is amplified by the third PMOS tube PM2 is reduced. Because the current supplied to the crystal oscillator circuit is reduced, the signal amplitude of the output terminal XI of the crystal oscillator circuit is also reduced, and when the signal amplitude of the output terminal XI and the current generated by the current source finally reach balance, the signal amplitudes at the output terminals XI and XO of the crystal oscillator circuit are the final stable crystal oscillator signal amplitude.
When the low-power-consumption crystal oscillator circuit provided by the embodiment of the invention starts oscillation, the minimum amplitude of the initial output signals of the output ends XI and XO is determined by the branch current I4 in the auxiliary current source unit. During oscillation starting, the current for accelerating oscillation starting is determined by branch current I2 in the current source circuit with amplitude feedback. Therefore, the oscillation starting time of the crystal oscillator can be reduced, and the minimum amplitude of the crystal oscillator output can be ensured not to be too low, so that the anti-interference capability of the whole crystal oscillator circuit is improved.
On the other hand, in the low-power-consumption crystal oscillator circuit provided in the embodiment of the present invention, in order to solve the problem that the output signal may oscillate, a positive feedback resistor, that is, a fourth resistor R3, is designed and added to the source of the first NMOS transistor NM0 in the current source unit, and through the positive feedback effect of the resistor, when the current source circuit receives the signal of the output terminal XI in a superimposed manner, the output current I1 of the current source circuit does not generate a sudden change and decrease, so that the amplitude of the output signal of the crystal oscillator circuit decreases slowly. When the circuit reaches a balanced state, the signal amplitudes at the output ends XI and XO of the crystal oscillator circuit are the final stable crystal oscillator signal amplitude, so that the problem that the oscillation phenomenon possibly occurs in the output signal of the crystal oscillator circuit is solved, and the specific working principle is explained as follows:
as described above, when the crystal oscillator circuit starts oscillation under a large current, the signal amplitude of the output terminal XI is superimposed on the gate voltage V0 of the first NMOS tube NM0 through the second capacitor C1, and at this time, assuming that there is no positive feedback fourth resistor R3 in the circuit, the drain voltage V1 of the first NMOS tube NM0 is decreased, so that the branch currents I0, I1, I2 are decreased rapidly, resulting in a rapid decrease of the signal amplitude of the output terminal XI of the crystal oscillator circuit. After the signal amplitude of the output end XI is reduced, the signal superposed on the gate voltage V0 of the first NMOS tube NM0 is reduced, the drain voltage V1 of the first NMOS tube NM0 can recover to be close to the original voltage level, so that the circuit continues to repeat the process of rapid oscillation starting, the branch currents I0, I1 and I2 are increased, the signal amplitude of the output end XI of the crystal oscillator circuit is increased, and the oscillation phenomenon of the output signal of the crystal oscillator circuit is caused.
In the low power consumption crystal oscillator circuit provided by the embodiment of the present invention, when the fourth resistor R3 is added, during the oscillation starting of the crystal oscillator circuit, when the signal amplitude of the output terminal XI increases, the signal amplitude is superimposed on the gate voltage V0 of the first NMOS transistor NM0 through the second capacitor C1, at this time, according to the current and voltage formula of the MOS transistor:
Vgs＝V0－V3 (2)
V3＝I6*R3 (3)
wherein Vgs is a junction voltage between the gate and the source of the NMOS transistor NM 0; vth is the threshold voltage of the NMOS transistor NM 0; v0 is the gate voltage of NMOS transistor NM 0; v3 is the source voltage of NMOS transistor NM 0; w is the gate width of the transistor; l is the effective grid length of the transistor; coxIs a gate oxide capacitance per unit area; μ is the mobility of the carrier; i6 is the branch current of the first NMOS transistor NM 0; r3 is the resistance of the fourth resistor R3.
According to the above formula (1), formula (2) and formula (3), when the gate voltage V0 of the first NMOS transistor NM0 increases, the junction voltage Vgs increases, so that the branch current I6 flowing through the first NMOS transistor NM0 increases rapidly, and the voltage V3 across the fourth resistor R3 also increases, so that the increase of the junction voltage Vgs of the first NMOS transistor NM0 is suppressed. According to the formula (1), the change of the branch current I6 flowing through the first NMOS tube NM0 is reduced, so the gate voltage V1 of the first NMOS tube NM0 does not decrease greatly, and the branch currents I0, I1, I2 do not change with the change of the signal amplitude of the output terminal XI particularly quickly, thereby solving the problem of oscillation phenomenon of the output signal of the crystal oscillator circuit.
Next, the excellent performance of the low power consumption crystal oscillator circuit provided by the present invention is further verified by the comparative experiment results shown in fig. 2(a) and fig. 2 (b).
Fig. 2(a) is a schematic diagram of a variation relationship between a signal waveform of an output terminal XI and a voltage V1 of a current source circuit in a start-up process of a crystal oscillator circuit (without a positive feedback resistor) in the prior art; fig. 2(b) is a schematic diagram of a variation relationship between a signal waveform of an output terminal XI and a voltage V1 of a current source circuit in a start-up process of a low-power-consumption crystal oscillator circuit (with a positive feedback resistor) according to an embodiment of the present invention. As can be seen from fig. 2(a) and 2(b), in the prior art crystal oscillator circuit, during oscillation starting, the signal waveform at the output terminal XI has oscillation phenomenon. In the low-power-consumption crystal oscillator circuit provided by the embodiment of the invention, the signal amplitude of the output end XI is changed smoothly in the oscillation starting process, and stable output signal amplitude is finally formed, so that the oscillation phenomenon of the output signal amplitude can not occur.
Through the specific description of the technical scheme of the invention in the embodiment, the low-power-consumption crystal oscillator circuit provided by the invention not only meets the technical requirements of quick oscillation starting and low-power-consumption work, but also has higher anti-interference capability, and through the optimization of the circuit structure design, the low-power-consumption crystal oscillator circuit can avoid the oscillation phenomenon of output signals in the oscillation starting process, and has the beneficial effects of simple and ingenious circuit design, reliable performance and the like.
Furthermore, the invention also provides an electronic device, wherein the low-power crystal oscillator circuit is adopted. As shown in fig. 3, the electronic device at least includes a processor and a memory, and may further include a communication component, a sensor component, a power component, a multimedia component, and an input/output interface according to actual needs. The memory, the communication component, the sensor component, the power supply component, the multimedia component and the input/output interface are all connected with 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 components, multimedia components, etc. may be implemented using common components and are not specifically described herein.
The low power consumption crystal oscillator circuit and the corresponding electronic device provided by the invention are explained in detail above. It will be apparent to those skilled in the art that various modifications can be made without departing from the spirit of the invention.
Claims (10)
1. A low-power consumption crystal oscillator circuit comprises a current source unit and a crystal circuit unit, and is characterized by also comprising an auxiliary current source unit; wherein the content of the first and second substances,
the current source unit and the auxiliary current source unit are respectively connected with the crystal circuit unit;
the current source unit provides accelerated oscillation starting current for the crystal circuit unit, the auxiliary current source unit provides initial oscillation starting current for the crystal circuit unit, and the crystal circuit unit provides clock signals to the outside.
2. The low power crystal oscillator circuit of claim 1, wherein:
the current source unit consists of a first PMOS (P-channel metal oxide semiconductor) transistor (PM0), a second PMOS transistor (PM1), a first NMOS (N-channel metal oxide semiconductor) transistor (NM0), a second NMOS transistor (NM1), a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor and a third capacitor; the source of the first NMOS transistor (NM0) is connected to the ground through a fourth resistor, the gate of the first NMOS transistor (NM0) is connected to the first resistor on the one hand, and is connected to the output terminal (XI) of the crystal oscillator circuit through the second capacitor on the other hand, the other end of the first resistor is connected to the drain of the first NMOS transistor (NM0), the drain of the first NMOS transistor (NM0) is further connected to the first capacitor, the second resistor and the source of the first PMOS transistor (PM0) respectively, the other end of the first capacitor is connected to the ground, the other end of the second resistor is connected to the third capacitor and the gate of the second NMOS transistor (NM1), the drain of the first PMOS transistor (PM0) is connected to the power supply terminal (Vdd), the gate of the first PMOS transistor (PM0) is connected to the gate of the second PMOS transistor (PM1), the drain of the second PMOS transistor (PM1) is connected to the drain of the power supply terminal (Vdd), the gate of the second PMOS transistor (NM1) is connected to the source of the second PMOS transistor (PM1), and the source of the second PMOS transistor (PM1) is connected to the drain of the third NMOS transistor (PM1) respectively PM2), the source of the second NMOS transistor (NM1) is connected to the ground terminal through a third resistor, and the other end of the third capacitor is connected to the ground terminal.
3. The low power crystal oscillator circuit of claim 1, wherein:
the crystal circuit unit consists of a third PMOS (P-channel metal oxide semiconductor) transistor (PM2), a fourth PMOS transistor (PM3), a third NMOS transistor (NM3), a fifth resistor and a crystal oscillator; the grid of the third PMOS tube (PM2) is connected with the source of the second PMOS tube (PM1) of the current source unit, the drain of the third PMOS tube (PM2) is connected with the power supply end (Vdd), the source of the third PMOS tube (PM2) is connected with the source of the fifth PMOS tube (PM4) of the auxiliary current source unit on one hand and the drain of the fourth PMOS tube (PM3) on the other hand, the grid of the fourth PMOS tube (PM3) is connected with the output end XI of the crystal oscillator circuit on the one hand and the grid of the fifth resistor and the third NMOS tube (NM3) on the other hand, the source of the fourth PMOS tube (PM3) is connected with the output end XO of the crystal oscillator circuit on the one hand and the other end of the fifth resistor and the drain of the third NMOS tube (NM3) on the other hand, the source of the third NMOS tube (NM3) is connected with the ground terminal, and the two ends of the crystal are connected with the output end XI of the crystal oscillator circuit and the output end of the crystal oscillator circuit.
4. The low power crystal oscillator circuit of claim 1, wherein:
the auxiliary current source unit consists of a fifth PMOS tube (PM4), a sixth PMOS tube (PM5) and a current source (Idc); the source of the fifth PMOS tube (PM4) is connected with the source of the third PMOS tube (PM2) of the transistor circuit unit, the drain of the fifth PMOS tube (PM4) is connected with the power supply end (Vdd), the gate of the fifth PMOS tube (PM4) is connected with the gate of the sixth PMOS tube (PM5), the gate of the sixth PMOS tube (PM5) is connected with the source, the drain of the sixth PMOS tube (PM5) is connected with the power supply end (Vdd), the source of the sixth PMOS tube (PM5) is connected with the current source (Idc), and the other end of the current source (Idc) is connected with the ground end.
5. The low-power crystal oscillator circuit according to any one of claims 2 to 4, wherein:
after a power supply end (Vdd) is powered on, when no signal is output from the output terminals XI and XO of the crystal oscillator circuit, a current source circuit composed of a first PMOS transistor (PM0), a second PMOS transistor (PM1), a first NMOS transistor (NM0), a second NMOS transistor (NM1) and a third resistor generates a large current, where a branch current of the first PMOS transistor (PM0) is I0, a branch current of the second PMOS transistor (PM1) is I1, and I0 is I1.
6. The low-power crystal oscillator circuit according to claim 5, wherein:
the third PMOS transistor (PM2) amplifies the branch current I1 by several times to form a branch current I2, and supplies the branch current I2 to the crystal oscillator circuit formed by the fourth PMOS transistor (PM3), the third NMOS transistor (NM3), and the fifth resistor.
7. The low-power crystal oscillator circuit according to any one of claims 2 to 4, wherein:
the branch current I5 generated by the current source (Idc) and the branch of the sixth PMOS tube (PM5) is mirrored by the fifth PMOS tube (PM4) to form a branch current I4, and the branch current I4 is provided for a crystal oscillator circuit formed by the fourth PMOS tube (PM3), the third NMOS tube (NM3) and a fifth resistor.
8. The low-power crystal oscillator circuit according to any one of claims 2 to 4, wherein:
when the gate voltage (V0) of the first NMOS transistor (NM0) increases, the junction voltage (Vgs) increases, so that the branch current I6 flowing through the first NMOS transistor (NM0) increases rapidly, and the voltage (V3) across the fourth resistor also increases, thereby suppressing the increase of the junction voltage (Vgs) of the first NMOS transistor (NM 0).
9. The low-power crystal oscillator circuit according to any one of claims 2 to 4, wherein:
when the signal amplitude of the output end XI of the crystal oscillator circuit is increased to a preset amplitude value, the signal of the output end XI of the crystal oscillator circuit is superposed on the grid voltage (V0) of the first NMOS tube (NM0) through the feedback path of the second capacitor, and a negative feedback structure is formed.
10. An electronic device comprising the low power crystal oscillator circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111532495.9A CN114337547A (en) | 2021-12-15 | 2021-12-15 | Low-power consumption crystal oscillator circuit and corresponding electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111532495.9A CN114337547A (en) | 2021-12-15 | 2021-12-15 | Low-power consumption crystal oscillator circuit and corresponding electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116526978A (en) * | 2023-04-06 | 2023-08-01 | 北京兆讯恒达技术有限公司 | Anti-interference fast-starting single-ended crystal oscillator circuit and electronic equipment |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116526978A (en) * | 2023-04-06 | 2023-08-01 | 北京兆讯恒达技术有限公司 | Anti-interference fast-starting single-ended crystal oscillator circuit and electronic equipment |
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