CN116155088A - Charge pump circuit and electronic device - Google Patents

Charge pump circuit and electronic device Download PDF

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Publication number
CN116155088A
CN116155088A CN202310121184.6A CN202310121184A CN116155088A CN 116155088 A CN116155088 A CN 116155088A CN 202310121184 A CN202310121184 A CN 202310121184A CN 116155088 A CN116155088 A CN 116155088A
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China
Prior art keywords
charge pump
module
reference power
output
circuit
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CN202310121184.6A
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Chinese (zh)
Inventor
刘洋
王艳梅
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Goertek Microelectronics Inc
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Goertek Microelectronics Inc
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Priority to CN202310121184.6A priority Critical patent/CN116155088A/en
Publication of CN116155088A publication Critical patent/CN116155088A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H02M3/073—Charge pumps of the Schenkel-type
    • H02M3/075—Charge pumps of the Schenkel-type including a plurality of stages and two sets of clock signals, one set for the odd and one set for the even numbered stages
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The present disclosure provides a charge pump circuit and an electronic device. The charge pump circuit includes: a charge pump module; the input end of the charge pump module is connected with the reference power supply module, and the output end of the charge pump module is used as the output end of the charge pump circuit; the charge pump module comprises N first charge pump units connected in series and controlled switches corresponding to the first charge pump units one by one, and each controlled switch is connected between the output end of the reference power supply module and the output end of the corresponding first charge pump unit.

Description

Charge pump circuit and electronic device
Technical Field
The embodiment of the application relates to the technical field of bias circuits, in particular to a charge pump circuit and electronic equipment.
Background
The microphone consists of a MEMS (Micro-Electro-Mechanical System, microelectromechanical system) chip and an ASIC (Application Specific Integrated Circuit ) chip. For the MEMS chip to function properly, a bias circuit inside the ASIC chip is required to provide a stable and low noise bias voltage to the MEMS chip.
However, the span between the bias voltages required by different MEMS chips is large, so that the bias voltages provided by the ASIC chips cannot be flexibly adapted to the different MEMS chips.
Disclosure of Invention
It is an object of embodiments of the present disclosure to provide a charge pump circuit.
According to a first aspect of embodiments of the present disclosure, there is provided a charge pump circuit comprising:
a charge pump module;
the input end of the charge pump module is connected with the reference power supply module, and the output end of the charge pump module is used as the output end of the charge pump circuit;
the charge pump module comprises N first charge pump units connected in series and controlled switches corresponding to the first charge pump units one by one, and each controlled switch is connected between the output end of the reference power supply module and the output end of the corresponding first charge pump unit.
Optionally, a plurality of first switches connected in parallel and first resistors corresponding to the first switches one by one are connected between the input end of the charge pump module and the reference power module, and the plurality of first resistors are connected in series between the reference power module and the grounding end;
a first end of the first switch is connected with the input end of the charge pump module, and a second end of the first switch is connected with a first end of the corresponding first resistor; the first end of the first resistor is one end close to the output end of the reference power supply module.
Optionally, the charge pump module further comprises:
m second charge pump units are connected in series at the output end of the last one of the first charge pump units.
Optionally, the charge pump circuit further comprises: an oscillator module and a voltage doubler module;
the power supply end of the oscillator module is connected with the reference power supply module, the oscillator module outputs a first clock signal based on the reference voltage output by the reference power supply module, the output end of the oscillator module is connected with the input end of the voltage doubler module, the output end of the voltage doubler module is connected with the second charge pump unit, the voltage doubler module is used for increasing the amplitude of the first clock signal and generating a second clock signal to be output to any one of the second charge pump units, the output end of the oscillator module is also connected with the first charge pump unit, and the oscillator module inputs the first clock signal to any one of the first charge pump units.
Optionally, the charge pump circuit further comprises:
the first control module is connected with the enabling end of the controlled switch and used for controlling any controlled switch to be disconnected, so that the number of the first charge pump units connected between the reference power supply module and the output end of the charge pump circuit is adjusted.
Optionally, the charge pump circuit further comprises
And the controlled end of the clock module is connected with the first control module, and the output end of the clock module is connected with the N first charge pump units.
Optionally, the charge pump circuit further comprises:
and the second control module is connected with the enabling end of the first switch and used for controlling any one of the first switches to be closed so as to adjust the first input voltage output by the reference power supply module to the charge pump module.
Optionally, the second control module and the first control module are the same digital calibration circuit.
Optionally, the controlled end of the reference power supply module is connected with the digital calibration circuit, and is used for adjusting the reference voltage output by the reference power supply module according to the output of the digital calibration circuit.
According to a second aspect of embodiments of the present disclosure, there is provided an electronic device comprising a charge pump circuit as in any one of the first aspects of the present disclosure.
The embodiment of the disclosure has the beneficial effects that the number of the first charge pump units connected between the reference power supply module and the output end of the charge pump circuit is controlled by switching off the controlled switch, so that the output voltage of the charge pump circuit is regulated, and meanwhile, different regulation precision of the output voltage of the charge pump circuit can be realized by setting the number of the first charge pump units, so that the charge pump circuit provides different bias voltages for different MEMS chips.
Other features of the present specification and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.
Fig. 1 is an internal structural diagram of a charge pump circuit provided by an embodiment of the present disclosure.
Fig. 2 is a diagram illustrating an input connection configuration of a charge pump circuit according to an embodiment of the present disclosure.
Fig. 3 is an internal structural diagram of a charge pump circuit provided in another embodiment of the present disclosure.
Fig. 4 is a connection structure diagram of a charge pump circuit provided in an embodiment of the present disclosure.
Fig. 5 is a diagram of a controlled switch connection of a charge pump circuit provided by an embodiment of the present disclosure.
Fig. 6 is a second diagram of a controlled switch connection of a charge pump circuit provided by an embodiment of the present disclosure.
Fig. 7 is a Dickson charge pump connection diagram of a charge pump circuit provided by an embodiment of the present disclosure.
Fig. 8 is a cross-coupled charge pump connection diagram of a charge pump circuit provided by an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the operation of MEMS microphones, MEMS require a stable and low noise bias voltage to convert mechanical deformations generated by sound pressure acting on the MEMS diaphragm into an electrical signal of a certain magnitude. The bias voltage is about 10V, much greater than the supply voltage, so a charge pump module is required to generate a dc level much greater than the supply voltage to bias the MEMS.
And the requirements of different MEMS on the voltage are different, the common MEMS bias voltage is in the range of 6-20 v, and the range span is large. To reduce the design cost of repeated development, it is desirable that the charge pump output voltage of the ASIC be adjustable. When different MEMS are matched, different voltages can be output according to the requirements.
In addition, even if MEMS and ASIC are in the same batch, the condition of inconsistent performance can also occur, and the output voltage of the charge pump is adjustable, so that the performance difference of the MEMS and the ASIC caused by the conditions of process, temperature and the like can be overcome.
Referring to fig. 1, a charge pump circuit provided by an embodiment of the present disclosure is described, the charge pump circuit including: a charge pump module.
The input end of the charge pump module is connected with the reference power module, and the output end of the charge pump module is used as the output end of the charge pump circuit.
The charge pump module comprises N first charge pump units connected in series and controlled switches corresponding to the first charge pump units one by one, and each controlled switch is connected between the output end of the reference power supply module and the output end of the corresponding first charge pump unit.
Wherein N is a natural number greater than or equal to 0, and the charge pump module is a dc-dc converter, and the capacitor is an energy storage element for generating an output voltage greater than the voltage input to the charge pump module.
In this embodiment, as shown in fig. 1, the first input voltage VIN is a reference voltage output by the reference power module, and before the charge pump module receives the first input voltage VIN, the controlled switches corresponding to the first charge pump units one by one are all placed in a closed state, so that a plurality of first charge pump units are all shorted.
When receiving the first input voltage VIN, any controlled switch receives an instruction for controlling the controlled switch to be turned off, and the target first charge pump unit corresponding to the controlled switch in the turned-off state receives the first input voltage VIN, and starts with the target first charge pump unit, and the output end of the last first charge pump unit in the rest first charge pump units connected in series with the output end of the target first charge pump unit is used as the output end of the charge pump circuit. Thus, the position of the controlled switch in the off state is related to the number of first charge pump units connected between the reference power supply module and the output of the charge pump circuit. Wherein the number of first charge pump units represents an adjustable number of stages of the charge pump module.
In one example, as shown in fig. 5, EN1, EN2 … … ENN2 are N controlled switches in sequence and the switches in the clock module correspond to the received enable signals. And receiving an EN3 enabling signal sent by the first control module, and switching off a target controlled switch corresponding to the EN3 enabling signal, so that all the first charge pump units from a target first charge pump unit corresponding to the target controlled switch to the last first charge pump unit are connected into the charge pump circuit, and lifting the first input voltage VIN. Wherein the other first charge pump units between the target first charge pump unit and the reference power supply module remain in a short circuit state, EN3 is an enable signal received corresponding to the third controlled switch and the third switch within the clock module.
In one example, the EN3 enable signal sent by the first control module is received, and the target controlled switch corresponding to the EN3 enable signal and other controlled switches between the target controlled switch and the reference power module are all turned off, so that the first input voltage VIN is received from the target first charge pump unit corresponding to the target controlled switch to the last first charge pump unit, and the first input voltage VIN is boosted.
In one embodiment of the present application, by controlling the on-off of any one of the controlled switches, a plurality of first charge pump units from the first charge pump unit corresponding to the controlled switch are connected to the charge pump circuit, and the position of the controlled switch in the off state is related to the number of the first charge pump units connected between the reference power module and the output end of the charge pump circuit. The quantity of the connected first charge pump units is adjustable by controlling the on-off of the controlled switch, so that the aim of adjusting the output voltage of the charge pump unit circuit is fulfilled. Meanwhile, the number of the first charge pump units connected in series can realize different adjustment precision of the output voltage of the charge pump circuit.
In one example, as shown in fig. 2, a plurality of first switches connected in parallel and first resistors corresponding to the first switches one by one are connected between the input end of the charge pump module and the reference power module, and the plurality of first resistors are connected in series between the reference power module and the ground end.
The first end of the first switch is connected with the input end of the charge pump module, and the second end of the first switch is connected with the first end of the corresponding first resistor. The first end of the first resistor is an end close to the output end of the reference power supply module, and the position of the first switch in the closed state is related to the first input voltage VIN output to the charge pump module by the reference power supply module.
In this embodiment, by controlling any one of the first switches to be turned on, the target first resistor corresponding to the first switch and the rest of the first resistors between the target first resistor and the reference power module are connected between the reference power module and the charge pump module. Any first switch is controlled to be conducted, so that the accessed first resistors divide the reference voltage output by the reference power supply module, the first input voltage VIN is adjusted, and the first input voltage VIN is further input to the charge pump module.
In one example, if the output voltage is increased by 1.5V per first charge pump unit connected to the stage, the adjustment target cannot be achieved by increasing or decreasing the first charge pump unit under the condition that the output voltage needs to be increased by 2V, so that the first input voltage VIN input to the first charge pump unit needs to be adjusted by connecting different numbers of first resistors in series to adjust the granularity of the output voltage, so that the granularity of the adjustment of the output voltage matches the voltage increase range of the first charge pump unit to achieve different output adjustment targets.
Under the condition that the output voltage needs to be increased to 4.5V, the reference voltage Verf output by the reference power supply module is 1.5V, at the moment, VIN=Verf=1.5V, the first control module sends enabling signals enabling the two first charge pump units to be connected into the charge pump circuit, the two connected first charge pump units increase the first input voltage VIN by 3V, and the output voltage is 4.5V.
Under the condition that the output voltage needs to be raised to 4V, the reference voltage Verf output by the reference power supply module is 1.5V, the output voltage cannot be raised to 4V by adopting an adjusting means connected with two first charge pump units or three first charge pump units, the granularity of voltage adjustment is overlarge, therefore, a plurality of first resistors are required to be connected in series to divide the Verf with the voltage of 1.5V to obtain VIN with the voltage of 1V, then the first control module sends an enabling signal for connecting the two first charge pump units into the charge pump circuit, the two connected first charge pump units raise the first input voltage VIN by 3V, and the output voltage is 4V.
In this embodiment, by setting a plurality of first resistors between the reference power module and the charge pump module, the purpose of dividing the reference voltage output by the reference power module is achieved, and further, under the condition that the resistance values of the plurality of first resistors are consistent, the reference voltage can be equally divided. According to the embodiment, the first switch is controlled to be closed, so that the first input voltage VIN is adjusted between 0V and 1.5V, the granularity of voltage adjustment is guaranteed to be small enough, and the voltage adjustment precision is higher.
In one example, when the output voltage needs to be raised to 4.5V, and the reference voltage Verf output by the reference power supply module is 1.5V, the first input voltage VIN output by the reference power supply module to the first charge pump unit is made to be 0V by connecting a plurality of first resistors, the first control module sends an enabling signal that enables the three first charge pump units to be connected to the charge pump circuit, the three connected first charge pump units raise the first input voltage VIN by 4.5V, and the output voltage is made to be 4.5V.
In one example, as shown in fig. 3, the charge pump module further includes:
m second charge pump units are connected in series at the output end of the last first charge pump unit.
In this embodiment, M is a positive integer greater than or equal to 1, the output voltage of the charge pump circuit is adjustable by the first charge pump units connected in series, and the output voltage of the charge pump circuit is ensured to reach a minimum value by the second charge pump units connected in series.
Specifically, when the number of the first charge pump units connected to the charge pump circuit is 0 and the reference voltage Vref is not regulated, the first input voltage VIN input to the charge pump module is equal to the reference voltage Vref, and the first input voltage VIN outputs the output voltage Vout through 0 first charge pump units and M second charge pump units.
At this time, the calculation formula of the output voltage Vout is:
Vout＝Vref+MVclk＝(M+1)Vref (1)
where Vclk is the voltage value raised by one second charge pump unit per access, vref=vclk since Vclk is supplied by the reference power supply block.
Further, in the case where the number of the first charge pump units connected to the charge pump circuit is 0 and the reference voltage Vref is not adjusted, it is obtained by the formula (1):
Voutmax＝(M+1)Vrefmax (2)
the digital calibration circuit adjusts the reference voltage Vref output by the reference power module, so that the reference voltage Vref is adjusted within the range of Vrefmax and Vrefmin, wherein Vrefmax is the maximum value of the reference voltage, and Vrefmin is the minimum value of the reference voltage. Due to the limitation of Vrefmax, vrefmin and M, if the number of the first charge pumps connected to the first charge pump is still 0, the output voltage Vout is not flexible enough, and it cannot be ensured that the output voltage Vout completely covers the required output voltage range.
For example, when the number of connected first charge pumps is still 0, the adjustment granularity of the output voltage Vout of the charge pump module is required to be 0.2, and the adjustment range of the output voltage is required to be 10V, then 50-gear adjustability is required to be achieved inside the charge pump module, that is, 50-gear adjustability is required to be achieved for Vref, so that the adjustment difficulty is high, and the connected first charge pump unit is required to be connected.
In one example, as shown in fig. 5, the first clock signals input to the first charge pump units are sequentially named as CLK1, CLK2 … … CLKN2, and the clock amplitudes of CLK1, CLK2 … … CLKN2 are CLKV1, and CLKV1 is the voltage value raised by each access to one first charge pump unit. The second clock signal input to the second charge pump unit is named CLK01 … … CLK0N1, CLK01 … … CLK0N1 has a clock amplitude CLKV2, CLKV2 is a voltage value raised by each of the second charge pump units, and CLKV1 and CLKV2 are provided by the reference power supply module. Under the condition that N is not equal to 0, the main structure of the charge pump circuit is divided into a second charge pump unit with a fixed stage and a first charge pump unit with an adjustable stage, and the second charge pump unit can meet the requirement of the minimum output voltage Vout.
In order to save area, CLKV2 of the second charge pump unit should be as large as possible so that output Voutmin can be achieved with as few second charge pump units as possible.
The first charge pump unit is designed to cover the regulation range of the output voltage Vout, and in theory, one Vclk voltage rise can be realized by accessing each first charge pump unit, so the number of the adjustable stage charge pumps can be obtained only according to (Voutmax-Voutmin)/Vclk.
CLKV1 may be implemented by a reference power module to power the oscillator OSC, or CLKV1 may be boosted to CLKV2 by a voltage multiplier. The adjusting granularity of the output voltage Vout is determined by the adjusting granularity of the first input voltage VIN, and the two granularity levels are the same, so that the adjusting granularity of the first input voltage VIN is only required to be designed to be small enough, i.e. more first resistors are connected.
In addition, in order to prevent the clock signal connected by the short-circuited first charge pump unit from interfering with the first input voltage VIN, a clock module is added, and when the corresponding first charge pump unit is short-circuited, the clock signal of the first charge pump unit is grounded to disable the first charge pump unit, so that the clock signal does not bring a high-frequency interfering signal into the VIN.
As shown in fig. 5, the controlled end of the clock module is connected to the first control module, the output end of the clock module is connected to the N first charge pump units, the first control module is configured to control conduction between the clock module and the target first charge pump unit, and the clock module is configured to provide clock source input to the N first charge pump units.
In one example, as shown in fig. 4, the charge pump circuit further includes: an oscillator module and a voltage doubler module.
The power end of the oscillator module is connected with the reference power module, the oscillator module outputs a first clock signal CLKV1 based on the reference voltage output by the reference power module, the output end of the oscillator module is connected with the input end of the voltage multiplier module, the output end of the voltage multiplier module is connected with the second charge pump unit, the voltage multiplier module is used for increasing the amplitude of the first clock signal and generating a second clock signal CLKV2 to be output to any second charge pump unit, the output end of the oscillator module is also connected with the first charge pump unit, and the oscillator module is used for converting the reference voltage output by the reference power module into the first clock signal input to any first charge pump unit.
In this embodiment, an oscillator module (oscillator) is used to provide the basic clock signal to the charge pump module. A voltage doubler module (voltage doubler) is used to boost the amplitude of the first clock signal, the voltage doubler module charges the capacitor with the voltage input thereto, and with switching of the circuit, the voltage of the capacitor can be made exactly twice the voltage input thereto in an ideal case.
In this embodiment, the oscillator module generates a first clock signal with the reference voltage Vref as an amplitude, outputs the first clock signal to the voltage doubler module, and the voltage doubler module boosts the amplitude of the first clock signal to obtain a second clock signal, and provides the second clock signal to the second charge pump unit, where the second clock signal is a voltage value boosted by each access to the second charge pump unit.
In one example, the number of stages N1 of the second charge pump unit is determined according to the minimum value Voutmin of the required output voltage of the charge pump circuit and the maximum amplitude Vclkmax that can be achieved, where the determination formula is:
N1＝Voutmin/Vclkmax (4)
the reason why the amplitude Vclkmax as large as possible is used as the amplitude of the second charge pump unit is that the boosting amplitude of each stage of charge pump can be increased, the number of stages of the second charge pump unit can be reduced, and the whole area of the charge pump circuit can be reduced.
And determining the maximum number N2 of the first charge pump unit according to the maximum value Voutmax of the output voltage of the charge pump module, wherein the determination formula is as follows:
N2＝(Voutmax-Voutmin-VINmax)/CLKV1 (5)
where CLKV1 is the first clock signal.
In one example, when the required output voltage Vout of the charge pump circuit is small, the first charge pump unit is all short-circuited by the enable signal EN, and the first input voltage VIN is directly input to the input terminal of the fixed stage charge pump, thus achieving the minimum output voltage of the charge pump. Meanwhile, the enable signal EN of the first control module also controls the clock signal of the first charge pump unit, when the first charge pump unit is short-circuited, all the clock signals of the first charge pump unit are invalid, namely, the first charge pump unit is grounded, so that the high-low switching of the clock signal can be prevented from interfering the first input voltage VIN. When a larger output voltage Vout is required to be output, only a portion of the first charge pump unit needs to be shorted. Thus, a larger output voltage Vout can be output. According to the embodiment of the application, the charge pump module with a wide output voltage adjustable range can be realized, and the first input voltage VIN is slightly disturbed by a clock signal.
In this embodiment, the oscillator module converts the reference voltage into a first clock signal and outputs the first clock signal to the first charge pump unit, and provides the first charge pump unit with a different first clock signal CLKV1, where the first clock signal CLKV1 is a voltage value raised by each access to the first charge pump unit.
In one example, the charge pump circuit further comprises:
and the first control module is connected with the enabling end of the controlled switch and used for controlling any controlled switch to be disconnected, so that the number of the first charge pump units connected between the reference power supply module and the output end of the charge pump circuit is adjusted.
In this embodiment, the first control module controls the controlled switches at positions corresponding to the first number to be disconnected according to the first number of the first charge pump units to be connected, so that the first number of the first charge pump units are connected to the charge pump circuit, and the purpose of lifting the output voltage is achieved.
In one example, the charge pump circuit further comprises:
and the second control module is connected with the enabling end of the first switch and used for controlling any one of the first switches to be closed so as to adjust the first input voltage output by the reference power supply module to the charge pump module.
In this embodiment, the second control module controls the first switch at a position corresponding to the second number to be turned on according to the second number of the first resistors to be connected, so that the second number of the first resistors are connected between the charge pump module and the reference power module, and the purpose of adjusting the first input voltage VIN input into the charge pump module is further achieved.
In one example, the second control module is the same digital calibration circuit as the first control module.
In this embodiment, the first control module and the second control module may be integrated into the same chip, so as to reduce the occupied area, or the same control module is adopted to implement the control logic of the first control module and the second control module at the same time, so that the occupied area can be reduced as well.
The digital calibration circuit is used for inputting instructions for controlling the first switch and the controlled switch after the charge pump circuit is packaged, so that different bias voltages are output by the charge pump circuit under different scenes.
In an example, as shown in fig. 5 to fig. 6, the on-off functions of the controlled switch and the clock module may be implemented by using an electrical switch, an NMOS transistor, a PMOS transistor, a transmission gate, and an nor logic circuit, and the first charge pump unit and the second charge pump unit may be Dickson charge pump or cross-coupled charge pump, and the control logic of the embodiment is applicable to any specific circuit structure of the charge pump.
As shown in fig. 7, the Dickson charge pump is based on the implementation of the structure of the embodiment of the present application, and the capacitor inside the Dickson charge pump stores energy, so as to release energy in a controlled manner to obtain a required output.
As shown in fig. 8, which is an implementation of a cross-coupled charge pump based structure according to an embodiment of the present application, numerous other charge pump structure variations are suitable.
In one example, the controlled end of the reference power supply module is connected with a digital calibration circuit, and is used for adjusting the reference voltage output by the reference power supply module according to the output of the digital calibration circuit.
In this embodiment, the amplitude of the first charge pump unit may be set to two or more editable states, that is, the reference voltage output by the reference power module may be adjusted under the effect of the digital calibration circuit, so that the number of stages of the first charge pump unit may be further reduced, and the area of the charge pump circuit may be reduced.
In the embodiment of the application, the number of the first charge pump units connected between the reference power supply module and the output end of the charge pump circuit is controlled by switching off the controlled switch, so that the output voltage of the charge pump circuit is regulated, and meanwhile, different regulation precision of the output voltage of the charge pump circuit can be realized by setting the number of the first charge pump units, so that the charge pump circuit provides different bias voltages for different MEMS chips.
The embodiment of the application also provides electronic equipment, which comprises any one of the charge pump circuits provided by the embodiment part, so that the electronic equipment provided by the embodiment of the application can realize the same function as any one of the charge pump circuits provided by the embodiment part. That is, in the embodiment of the application, the number of the first charge pump units connected between the reference power supply module and the output end of the charge pump circuit is controlled by turning off the controlled switch, so that the output voltage of the charge pump circuit is adjusted, and meanwhile, different adjustment precision of the output voltage of the charge pump circuit can be realized by setting the number of the first charge pump units, so that the charge pump circuit provides different bias voltages for different MEMS chips.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A charge pump circuit, comprising: a charge pump module;
the input end of the charge pump module is connected with the reference power supply module, and the output end of the charge pump module is used as the output end of the charge pump circuit;
the charge pump module comprises N first charge pump units connected in series and controlled switches corresponding to the first charge pump units one by one, and each controlled switch is connected between the output end of the reference power supply module and the output end of the corresponding first charge pump unit.
2. The charge pump circuit of claim 1, wherein a plurality of first switches connected in parallel and first resistors corresponding to the first switches one to one are connected between the input end of the charge pump module and the reference power module, and the plurality of first resistors are connected in series between the reference power module and the ground end;
a first end of the first switch is connected with the input end of the charge pump module, and a second end of the first switch is connected with a first end of the corresponding first resistor; the first end of the first resistor is one end close to the output end of the reference power supply module.
3. The charge pump circuit of claim 1, wherein the charge pump module further comprises:
m second charge pump units are connected in series at the output end of the last first charge pump unit.
4. The charge pump circuit of claim 3, further comprising: an oscillator module and a voltage doubler module;
the power supply end of the oscillator module is connected with the reference power supply module, the oscillator module outputs a first clock signal based on the reference voltage output by the reference power supply module, the output end of the oscillator module is connected with the input end of the voltage doubler module, the output end of the voltage doubler module is connected with the second charge pump unit, the voltage doubler module is used for increasing the amplitude of the first clock signal and generating a second clock signal to be output to any one of the second charge pump units, the output end of the oscillator module is also connected with the first charge pump unit, and the oscillator module inputs the first clock signal to any one of the first charge pump units.
5. The charge pump circuit of claim 2, further comprising:
the first control module is connected with the enabling end of the controlled switch and used for controlling any controlled switch to be disconnected, so that the number of the first charge pump units connected between the reference power supply module and the output end of the charge pump circuit is adjusted.
6. The charge pump circuit of claim 5, further comprising:
and the controlled end of the clock module is connected with the first control module, and the output end of the clock module is connected with the N first charge pump units.
7. The charge pump circuit of claim 5, further comprising:
and the second control module is connected with the enabling end of the first switch and used for controlling any one of the first switches to be closed so as to adjust the first input voltage output by the reference power supply module to the charge pump module.
8. The charge pump circuit of claim 7, wherein the second control module is the same digital calibration circuit as the first control module.
9. The charge pump circuit of claim 8, wherein the controlled terminal of the reference power module is coupled to the digital calibration circuit for adjusting the reference voltage output by the reference power module based on the output of the digital calibration circuit.
10. An electronic device comprising a charge pump circuit as claimed in any one of claims 1-9.
CN202310121184.6A 2023-02-15 2023-02-15 Charge pump circuit and electronic device Pending CN116155088A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310121184.6A CN116155088A (en) 2023-02-15 2023-02-15 Charge pump circuit and electronic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310121184.6A CN116155088A (en) 2023-02-15 2023-02-15 Charge pump circuit and electronic device

Publications (1)

Publication Number Publication Date
CN116155088A true CN116155088A (en) 2023-05-23

Family

ID=86373162

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310121184.6A Pending CN116155088A (en) 2023-02-15 2023-02-15 Charge pump circuit and electronic device

Country Status (1)

Country Link
CN (1) CN116155088A (en)

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