CN114253339A - Band-gap reference voltage source circuit and method for reducing circuit power consumption thereof - Google Patents
Band-gap reference voltage source circuit and method for reducing circuit power consumption thereof Download PDFInfo
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Abstract
The invention discloses a band-gap reference voltage source circuit and a method for reducing the power consumption of the circuit, wherein the circuit comprises: the time sequence control module generates a control signal; the band-gap reference voltage source module generates band-gap reference voltage when in work; the switch module is respectively connected with the time sequence control module and the time sequence control module, receives the control signal and is used for intermittently communicating the power supply end and the output end of the band-gap reference voltage source module and the band-gap reference voltage source circuit according to the control signal; and one end of the holding capacitor is connected with the band-gap reference voltage source module through the switch module, and the other end of the holding capacitor is grounded and used for maintaining the band-gap reference voltage supplied to the output end when an electric connection path between the band-gap reference voltage source module and the output end is disconnected. The invention can effectively reduce the power consumption of the band-gap reference voltage source and has low cost.
Description
Technical Field
The invention relates to the technical field of band-gap reference voltage sources, in particular to a band-gap reference voltage source circuit and a method for reducing power consumption of the band-gap reference voltage source circuit.
Background
With the rapid development of system integration technology, bandgap reference voltage sources have become indispensable basic circuit modules in large-scale, very large-scale integrated circuits and almost all digital analog systems. The method can be widely applied to high-precision comparators, A/D and D/A converters, random dynamic memories, flash memories and system integrated chips. With the development of science and technology, the requirement of low power consumption of integrated circuits is becoming an important research direction for technicians. Since the self power consumption of the bandgap reference voltage source has a direct and crucial influence on the overall power consumption of the whole integrated circuit system, the research on the low-power and even ultra-low-power operation of the bandgap reference voltage source will become necessary.
The traditional bandgap reference voltage source circuit can only be implemented by increasing the resistance if the ultra-low power consumption is desired, but this inevitably increases the chip area and the cost.
Therefore, there is a need to provide an improved technical solution to overcome the above technical problems in the prior art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a band-gap reference voltage source circuit and a method for reducing the power consumption of the band-gap reference voltage source circuit, which effectively reduce the power consumption of the band-gap reference voltage source, realize the ultra-low power consumption operation of the band-gap reference voltage source, and have the advantages of small chip area and low cost.
According to the invention, the band gap reference voltage source circuit comprises: the time sequence control module generates a control signal; the band-gap reference voltage source module generates band-gap reference voltage when in work; the switch module is respectively connected with the time sequence control module and the time sequence control module, receives the control signal and is used for intermittently communicating the power supply end and the output end of the band-gap reference voltage source module and the band-gap reference voltage source circuit according to the control signal; and one end of the holding capacitor is connected with the band-gap reference voltage source module through the switch module, and the other end of the holding capacitor is grounded and used for maintaining the band-gap reference voltage supplied to the output end when an electric connection path between the band-gap reference voltage source module and the output end is disconnected.
Preferably, the switch module includes: the first switch is connected between a power supply pin of the band-gap reference voltage source module and the power supply end, a control end of the first switch is connected with the time sequence control module to receive the control signal, and the first switch is used for connecting or disconnecting an electric connection path between the band-gap reference voltage source module and the power supply end based on the control signal; the second switch is connected between an output pin of the band-gap reference voltage source module and the output end, a control end of the second switch is connected with the time sequence control module to receive the control signal, and the second switch is used for connecting or disconnecting an electric connection path between the band-gap reference voltage source module and the output end based on the control signal.
Preferably, the first switch and the second switch are both NMOS transistors.
Preferably, the first switch and the second switch are both PMOS transistors.
Preferably, the first switch and the second switch are both CMOS switches.
Preferably, the control signal is a low frequency signal.
Preferably, in one signal period of the control signal, the on-time of the switch module is smaller than the off-time of the switch module.
Preferably, the bandgap reference voltage source circuit is configured to provide a bandgap reference voltage for one or more modules in a voltage controlled oscillator, a digital temperature compensated transistor oscillator or a phase locked loop in the radio frequency chip.
The invention provides a method for reducing power consumption of a band-gap reference voltage source circuit, which comprises the following steps: the band-gap reference voltage source module is communicated with an electric connection path of the power supply end and the output end, generates band-gap reference voltage and charges the holding capacitor; and disconnecting the electric connection path of the band-gap reference voltage source module with the power supply end and the output end, and maintaining and providing the band-gap reference voltage by the holding capacitor.
Preferably, the method for connecting or disconnecting the electrical connection paths of the band gap reference voltage source module and the power supply end and the output end comprises the following steps: a switch module is respectively arranged between the band-gap reference voltage source module and the power supply end and the output end; and controlling the switch module to be switched on by adopting a time sequence control module so as to communicate the electric connection paths of the band gap reference voltage source module and the power supply end and the output end, or controlling the switch module to be switched off by adopting the time sequence control module so as to disconnect the electric connection paths of the band gap reference voltage source module and the power supply end and the output end.
Preferably, in one signal cycle of the timing control module, the connection time of the bandgap reference voltage source module and the electrical connection path between the power supply terminal and the output terminal is less than the disconnection time.
The invention has the beneficial effects that: the invention discloses a band-gap reference voltage source circuit and a method for reducing the power consumption of the band-gap reference voltage source circuit, wherein a switch module is arranged between a band-gap reference voltage source module and a power supply end and an output end, and a time sequence control module controls the switch module to be switched on intermittently to realize the intermittent work of the band-gap reference voltage source module so as to provide band-gap reference voltage and charge a holding capacitor, and meanwhile, the holding capacitor discharges to maintain the supply of the band-gap reference voltage during the period that the band-gap reference voltage source module is disconnected (not working) with the power supply end and the output end, thereby ensuring the continuous output of the band-gap reference voltage, reducing the working time of the band-gap reference voltage source module, realizing the ultra-low power consumption work of the circuit under the condition of not increasing the circuit resistance, reducing the chip area and reducing the cost.
Two NMOS transistors or PMOS transistors are adopted to form a switch module to control the band-gap reference voltage source module, and the circuit is simple in structure and low in power consumption.
The on-off control of the switch module is carried out by adopting a low-frequency control signal, and the power consumption of the sequential control module can be approximately ignored, so that new power consumption can not be introduced into the circuit, and the ultra-low power consumption characteristic of the circuit is further ensured.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 shows a system block diagram of a bandgap reference voltage source circuit provided in accordance with an embodiment of the present invention;
FIG. 2 is a circuit block diagram of a bandgap reference voltage source circuit provided in accordance with an embodiment of the present invention;
FIG. 3 is a signal timing diagram of control signals in a bandgap reference voltage source circuit according to an embodiment of the present invention;
fig. 4 shows a flowchart of a method for reducing power consumption of a bandgap reference voltage source circuit according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a system block diagram of a bandgap reference voltage source circuit provided according to an embodiment of the present invention, fig. 2 shows a circuit block diagram of the bandgap reference voltage source circuit provided according to an embodiment of the present invention, and fig. 3 shows a signal timing diagram of a control signal in the bandgap reference voltage source circuit provided according to an embodiment of the present invention.
As shown in fig. 1, in the present embodiment, the bandgap reference voltage source circuit includes: timing control module 100, bandgap reference voltage source module 200, switch module 200 and holding capacitor CHolding。
The timing control circuit 100 is used to provide control signals.
In this embodiment, the control signal provided by the timing control module 100 is a square wave signal with continuous periods.
The bandgap reference voltage source module 200 is used for providing a bandgap reference voltage. Wherein the bandgap reference voltage source module 200 only provides the bandgap reference voltage during its operation, and simultaneously during the operation of the bandgap reference voltage source module 200, it is also used for the holding capacitor CHoldingAnd charging is carried out.
The switch module 300 is disposed between the bandgap reference voltage source module 200 and the power supply terminal VDD and the output terminal VBGAnd respectively connected to the bandgap reference voltage source module 200 and the timing control module 100, and receiving the control signal and intermittently communicating the bandgap reference voltage source module 200 with the power supply terminal VDD and the output terminal V (of the bandgap reference voltage source circuit) based on the control signalBGThe electrical connection path of (a).
In this embodiment, the switch module 300 intermittently connects the bandgap reference voltage source module 200 with the power supply terminal VDD and the output terminal V based on the control signalBGThe electrical connection path of (a) is specifically: in a signal period of the control signal, when the control signal is in a first level state, the switch module 300 is controlled to connect the bandgap reference voltage source module 200 with the supply terminal VDD and the output terminal VBGWhen the control signal is in the second level state, the switch module 300 is controlled to disconnect the bandgap reference voltage source module 200 from the supply terminal VDD and the output terminal VBGFurther, the band-gap reference voltage source module 200 is intermittently communicated with the power supply terminal VDD and the output terminal V in a continuous control signal periodBGThe electrical connection path of (a). When the switch module 300 controls and connects the bandgap reference voltage source module 200 with the power supply terminal VDD and the output terminal VBGWhen the power supply path is electrically connected, the bandgap reference voltage source module 200 is in a working state, and the bandgap reference voltage source module 200 is used as an output terminal VBGThe band-gap reference voltage is provided and is normally consumed. When the switch module 300 controls to disconnect the bandgap reference voltage source module 200 from the power supply terminal VDD and the output terminal VBGIn the electrical connection path of (2), a band gap baseThe quasi-voltage source module 200 is in a non-operating state, and the bandgap reference voltage source module 200 is in a non-power consumption state or has negligible power consumption.
Holding capacitor CHoldingIs connected to the bandgap reference voltage source module 200 through the switch module 300, and the other end is grounded (corresponding to the holding capacitor C)HoldingAn output end V connected with the band-gap reference voltage source circuitBGAnd ground) for the bandgap reference voltage source module 200 and the output terminal VBGIs an output terminal V when the electrical connection path is disconnectedBGA bandgap reference voltage is provided.
In this embodiment, when the bandgap reference voltage source module 200 is in the normal operating state, it is not only the output terminal VBGProviding a bandgap reference voltage and also for the holding capacitor CHoldingAnd charging is carried out. When the bandgap reference voltage source module 200 is in the non-operating state, it is coupled to the holding capacitor CHoldingAfter the charging is finished, the capacitor C is changed to be used as a holding capacitorHoldingMaintain the output end VBGA bandgap reference voltage is provided. Therefore, the working time of the band gap reference voltage source module 200 is reduced while the band gap reference voltage is ensured to be continuously output, the ultra-low power consumption work of the circuit can be realized under the condition that the circuit resistance is not increased, the chip area is reduced, and the cost is reduced.
Further, in this embodiment, the control signal output by the timing control module 100 is a low-frequency signal, and the power consumption of the timing control module 100 can be ignored when the circuit operates, so that the ultra-low power consumption of the bandgap reference voltage source module 200 is not affected. Meanwhile, the duty ratio of the control signal output by the timing control module 100 is adjustable, and the holding capacitor C is adjusted by setting a proper duty ratioHoldingThe proportion of the charging and discharging time, and further ensures that the circuit can realize stable band-gap reference voltage output so as to ensure the high-quality work of the circuit.
Further, as shown in fig. 2, in the present embodiment, the switch module 300 includes a first switch Q1 and a second switch Q2. The first switch Q1 is connected between the power supply pin of the bandgap reference voltage source module 200 and the power supply terminal VDDA control terminal of the first switch Q1 is connected to the timing control module 100 to receive a control signal, and is used for connecting or disconnecting the power supply pin of the bandgap reference voltage source module 200 to the power supply terminal VDD based on the control signal. The second switch Q2 is connected to the output pin and the output end V of the bandgap reference voltage source module 200BGAnd a control terminal of the second switch Q2 is connected to the timing control module 100 for receiving a control signal for connecting or disconnecting the output pin of the bandgap reference voltage source module 200 and the output terminal V based on the control signalBGThe electrical connection path of (a).
In the first embodiment of the present invention, the first switch Q1 and the second switch Q2 are both NMOS transistors. At this time, the first level state of the control signal outputted by the timing control module 100 is the high level state to control the first switch Q1 and the second switch Q2 to be turned on simultaneously, so as to communicate the bandgap reference voltage source module 200 with the power supply terminal VDD and the output terminal V simultaneouslyBGThe electrical connection path of (a). The second level state of the control signal is a low level state to control the first switch Q1 and the second switch Q2 to turn off simultaneously, thereby disconnecting the bandgap reference voltage source module 200 from the supply terminal VDD and the output terminal V simultaneouslyBGThe electrical connection path of (a).
In the second embodiment of the present invention, the first switch Q1 and the second switch Q2 are both PMOS transistors. At this time, the first level state of the control signal outputted by the timing control module 100 is the low level state to control the first switch Q1 and the second switch Q2 to be turned on simultaneously, so as to communicate the bandgap reference voltage source module 200 with the power supply terminal VDD and the output terminal V simultaneouslyBGThe electrical connection path of (a). The second level state of the control signal is a high level state to control the first switch Q1 and the second switch Q2 to turn off simultaneously, thereby disconnecting the bandgap reference voltage source module 200 from the supply terminal VDD and the output terminal V simultaneouslyBGThe electrical connection path of (a).
In the third embodiment of the present invention, the first switch Q1 and the second switch Q2 are CMOS switches using CMOS process.
Based on the above description of the embodiments, in the technical solution disclosed in the present invention, the timing control module 100 can control the switch module 300 to simultaneously connect or disconnect the beltGap reference voltage source module 200, power supply terminal VDD and output terminal VBGCan ensure that the band-gap reference voltage source module 200 enters a non-working state and the holding capacitor CHoldingIs maintained to the output end VBGProviding a bandgap reference voltage in synchronism with the output voltage to avoid the presence of a holding capacitor CHoldingIs maintained to the output end VBGWhen the bandgap reference voltage is provided, the bandgap reference voltage source module 200 is still connected to the power supply terminal VDD and is in an operating state, which results in increased power consumption, or the bandgap reference voltage source module 200 is prevented from being in a non-operating state and the capacitor C is keptHoldingIs maintained to the output end VBGWhen the band-gap reference voltage is provided, the band-gap reference voltage source module 200 is still connected with the output end VBGConnected to result in a holding capacitance CHoldingTowards the bandgap reference voltage source module 200 and the output terminal V simultaneouslyBGProviding a voltage to cause an output to an output terminal VBGThe band-gap reference voltage can not meet the requirement, so that the circuit can be effectively ensured to have high output voltage quality while the power consumption is reduced. Meanwhile, only two transistors are adopted to form a switch module to control the band-gap reference voltage source module, the circuit structure is simple, and the power consumption of the switch module is low.
Preferably, in this embodiment, in one signal period of the control signal, the on-time of the switch module 200 is less than the off-time of the switch module 200. That is, in one signal period of the control signal, the bandgap reference voltage source module 200 is connected to the supply terminal VDD and the output terminal VBGThe on time of the electric connection path is less than the off time, so that the ultra-low power consumption of the band-gap reference voltage source circuit can be further realized. Further, the above time relationship should satisfy the requirement for the holding capacitance CHoldingThe charging and discharging time is set on the premise of being reasonable so as to guarantee the output quality of the circuit.
It should be noted that the bandgap reference voltage source circuit disclosed in the present invention may be used to provide a bandgap reference voltage for one or more modules in a voltage controlled oscillator, a digital temperature compensated transistor oscillator, or a phase locked loop in a radio frequency chip.
Exemplary ofAs shown in fig. 3, it is assumed that the time of one signal cycle of the control signal provided by the timing control module 100 is n × T, and the switch module 200 is controlled to connect the bandgap reference voltage source module 200 with the power supply terminal VDD and the output terminal V in one signal cycleBGHas a time T, i.e. the duty ratio of the control signal is 1/n, and the power consumption of the bandgap reference voltage source module 200 is Iq during the time T, then the total power consumption of the whole bandgap reference voltage source circuit in one signal period is
That is, the bandgap reference voltage source circuit disclosed by the invention can reduce the power consumption of the conventional bandgap reference voltage source to 1/n. Wherein n is a natural number greater than 1. It can therefore be appreciated that the greater n, the smaller the duty cycle of the control signal and the lower the power consumption of the bandgap reference voltage source circuit.
Fig. 4 shows a flowchart of a method for reducing power consumption of a bandgap reference voltage source circuit according to an embodiment of the present invention.
As shown in fig. 4, in this embodiment, the method for reducing the power consumption of the bandgap reference voltage source circuit includes the following steps:
in step S1, the bandgap reference voltage source module is connected to the power supply terminal and the output terminal to generate the bandgap reference voltage, and the holding capacitor is charged.
In step S2, the electrical connection paths between the bandgap reference voltage source module and the power supply terminal and the output terminal are disconnected, and the supply of the bandgap reference voltage is maintained by the holding capacitor.
Referring to fig. 1 to 2, in the present embodiment, a method for connecting or disconnecting an electrical connection path between a bandgap reference voltage source module and a power supply terminal and an output terminal includes: bandgap reference voltage source module 200, power supply terminal VDD and output terminal VBGThe switch modules 300 are respectively arranged between the two modules; the sequential control module 100 is adopted to control the switch module 300 to be conducted so as to communicate the band-gap reference voltage source module 200 with the power supply terminal VDD and the output terminal VBGOr the timing control module 100 is adopted to control the switch module 300 to be turned offDisconnecting the bandgap reference voltage source module 200 from the supply terminal VDD and the output terminal VBGThe electrical connection path of (a).
Further, in a signal period of the time-grant control module, the bandgap reference voltage source module 200 is connected to the supply terminal VDD and the output terminal VBGIs less than the disconnection time. So as to further reduce the power consumption of the band-gap reference voltage source circuit.
The details of the method for reducing the power consumption of the bandgap reference voltage source circuit disclosed in this embodiment can be understood by referring to the working principle of the bandgap reference voltage source circuit described in fig. 1 to 3 herein, and are not described herein again.
In summary, the switch module is arranged between the bandgap reference voltage source module and the power supply terminal and the output terminal, and the timing control module controls the switch module to conduct intermittently to realize intermittent operation of the bandgap reference voltage source module to provide the bandgap reference voltage and charge the holding capacitor, and the holding capacitor maintains the bandgap reference voltage during the period that the bandgap reference voltage source module is disconnected (does not work) with the power supply terminal and the output terminal, so that the bandgap reference voltage is continuously output, the operating time of the bandgap reference voltage source module is reduced, the ultra-low power consumption operation of the circuit is realized without increasing the circuit resistance, the chip area is reduced, and the cost is reduced.
It should be noted that, in this document, the contained terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (11)
1. A bandgap reference voltage source circuit, comprising:
the time sequence control module generates a control signal;
the band-gap reference voltage source module generates band-gap reference voltage when in work;
the switch module is respectively connected with the time sequence control module and the time sequence control module, receives the control signal and is used for intermittently communicating the power supply end and the output end of the band-gap reference voltage source module and the band-gap reference voltage source circuit according to the control signal;
and one end of the holding capacitor is connected with the band-gap reference voltage source module through the switch module, and the other end of the holding capacitor is grounded and used for maintaining the band-gap reference voltage supplied to the output end when an electric connection path between the band-gap reference voltage source module and the output end is disconnected.
2. The bandgap reference voltage source circuit of claim 1, wherein the switching module comprises:
the first switch is connected between a power supply pin of the band-gap reference voltage source module and the power supply end, a control end of the first switch is connected with the time sequence control module to receive the control signal, and the first switch is used for connecting or disconnecting an electric connection path between the band-gap reference voltage source module and the power supply end based on the control signal;
the second switch is connected between an output pin of the band-gap reference voltage source module and the output end, a control end of the second switch is connected with the time sequence control module to receive the control signal, and the second switch is used for connecting or disconnecting an electric connection path between the band-gap reference voltage source module and the output end based on the control signal.
3. The bandgap reference voltage source circuit of claim 2, wherein the first switch and the second switch are both NMOS transistors.
4. The bandgap reference voltage source circuit of claim 2, wherein the first switch and the second switch are both PMOS transistors.
5. The bandgap voltage reference source circuit of claim 2, wherein the first switch and the second switch are both CMOS switches.
6. The bandgap reference voltage source circuit of claim 1, wherein the control signal is a low frequency signal.
7. The bandgap reference voltage source circuit of claim 1, wherein the on-time of the switching module is less than the off-time of the switching module in one signal period of the control signal.
8. The bandgap reference voltage source circuit according to any of claims 1 to 7, wherein the bandgap reference voltage source circuit is configured to provide a bandgap reference voltage for one or more of a voltage controlled oscillator, a digital temperature compensated transistor oscillator or a phase locked loop in a radio frequency chip.
9. A method for reducing power consumption of a bandgap reference voltage source circuit, comprising:
the band-gap reference voltage source module is communicated with an electric connection path of the power supply end and the output end, generates band-gap reference voltage and charges the holding capacitor;
and disconnecting the electric connection path of the band-gap reference voltage source module with the power supply end and the output end, and maintaining and providing the band-gap reference voltage by the holding capacitor.
10. The method for reducing power consumption of a bandgap reference voltage source circuit as claimed in claim 9, wherein the step of switching on or off the electrical connection path between the bandgap reference voltage source module and the supply terminal and the output terminal comprises:
a switch module is respectively arranged between the band-gap reference voltage source module and the power supply end and the output end;
adopting a time sequence control module to control the conduction of the switch module so as to communicate the electric connection paths of the band-gap reference voltage source module and the power supply end and the output end, or
And controlling the switch module to be switched off by adopting a time sequence control module so as to disconnect the electric connection paths of the band-gap reference voltage source module and the power supply end and the output end.
11. The method of claim 10, wherein the connection time of the bandgap reference voltage source module to the electrical connection paths of the power supply terminal and the output terminal is less than the disconnection time in one signal period of the time-grant control module.
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| US20110032027A1 (en) * | 2009-08-05 | 2011-02-10 | Texas Instruments Incorporated | Switched bandgap reference circuit for retention mode |
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Application publication date: 20220329 |