CN113162583A - RC oscillator with frequency temperature compensation function - Google Patents
RC oscillator with frequency temperature compensation function Download PDFInfo
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- CN113162583A CN113162583A CN202110278238.0A CN202110278238A CN113162583A CN 113162583 A CN113162583 A CN 113162583A CN 202110278238 A CN202110278238 A CN 202110278238A CN 113162583 A CN113162583 A CN 113162583A
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Abstract
The invention discloses an RC oscillator with a frequency temperature compensation function, which comprises a crystal oscillation circuit, wherein the crystal oscillation circuit comprises a current source module, a resistance module and a capacitance module, and the capacitance module comprises an adjustable capacitor; the RC oscillator also comprises a band-gap reference voltage source, a temperature sensor circuit, an ADC module and a logic controller; the output end of the temperature sensor circuit is connected to the ADC module, and the ADC module collects temperature detection voltage and sends the temperature detection voltage to the logic controller; the output end of the band-gap reference voltage source is connected to the ADC module, and the ADC module collects the band-gap reference voltage and sends the band-gap reference voltage to the logic controller; the logic controller adjusts the capacitance value of the adjustable capacitor according to the band gap reference voltage and the temperature detection voltage; the invention carries out logic digital operation through the logic controller, adjusts the capacitance value of the adjustable capacitor, further adjusts the frequency of the oscillation signal output by the RC oscillator, and reduces the influence of temperature on the oscillation frequency of the RC oscillator.
Description
All as the field of technology
The invention relates to the technical field of crystal oscillators, in particular to an RC oscillator with a frequency temperature compensation function.
All the above-mentioned background techniques
The crystal oscillator has good frequency accuracy and stability, small volume and low power consumption, is often used as a time frequency reference, and is widely applied to military and civil communication radio stations, microwave communication equipment, program-controlled telephone exchanges, radio comprehensive testers, BP (back propagation) machines, mobile telephone transmitting stations, high-grade frequency counters, GPS (global positioning system), satellite communication, remote control mobile equipment and the like. The off-chip crystal oscillator has good frequency stability and high absolute accuracy, and is widely used in an integrated circuit system, but the off-chip crystal oscillator has large volume, high cost and high power consumption. Therefore, an RC oscillator is usually used in the chip, the RC oscillator includes a resistor and a capacitor to form a frequency-selecting network, the RC oscillator is realized by charging and discharging an RC, and the frequency of the RC oscillator is inversely proportional to the product of the resistor R and the capacitor C.
As shown in FIG. 1, a conventional RC oscillator utilizes up and down currents IS1And IS2Charging and discharging the first capacitor C1, and comparing the voltage of the capacitor C1 with V by a window comparatorHAnd VLComparison (V)HAnd VLIs a current IS3Obtained by voltage division through the resistor R1 and the resistor R2), the comparison result is output to the SR flip-flop SR1, and the oscillation voltage CK is output by the SR flip-flop SR 1. When the temperature changes, the capacitance and the resistance of the RC oscillator change, so that the time constant of the RC oscillator changes. The frequency of the oscillator directly depends on a time constant, if the circuit is not compensated for temperature, the frequency of the RC oscillator inside the chip changes by more than 10% in a full temperature region, how to adjust the oscillation frequency of the RC oscillator to prevent the RC oscillator from being influenced by temperature is a technical problem to be solved by technicians in the field.
All the contents of the invention
The invention aims to provide an RC oscillator with a frequency temperature compensation function, which reduces the influence of temperature on the oscillation frequency of the RC oscillator.
For the purpose of the invention, the technical scheme adopted by the invention is as follows:
an RC oscillator with a frequency temperature compensation function comprises a crystal oscillation circuit, wherein the crystal oscillation circuit comprises a current source module, a resistance module and a capacitance module, and the current source module provides current to the resistance module and the capacitance module; the crystal oscillation circuit generates and outputs oscillation voltage according to the voltage of the resistance module and the voltage of the capacitance module;
the capacitance module comprises an adjustable capacitor; the RC oscillator further comprises a band-gap reference voltage source, a temperature sensor circuit, an ADC module and a logic controller; the output end of the temperature sensor circuit is connected to the ADC module, and the ADC module collects temperature detection voltage and sends the temperature detection voltage to the logic controller; the output end of the band-gap reference voltage source is connected to the ADC module, and the ADC module collects the band-gap reference voltage and sends the band-gap reference voltage to the logic controller; and the logic controller adjusts the capacitance value of the adjustable capacitor according to the band gap reference voltage and the temperature detection voltage.
As a specific implementation manner, the bandgap reference voltage source includes a first MOS transistor, a second MOS transistor, a third MOS transistor, a first triode, a second triode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor, and a first operational amplifier;
the source electrode of the first MOS tube, the source electrode of the second MOS tube and the source electrode of the third MOS tube are connected with a power supply; the grid electrode of the first MOS tube, the grid electrode of the second MOS tube and the grid electrode of the third MOS tube are connected and connected with the output end of the first operational amplifier in parallel; the drain electrode of the first MOS tube is connected with the positive input end of the first operational amplifier, one end of the fifth resistor and one end of the sixth resistor; the other end of the sixth resistor is connected with the collector of the first triode; the base electrode of the first triode is connected with the base electrode of the second triode and grounded; the emitter of the first triode, the other end of the fifth resistor and the emitter of the second triode are grounded; the drain electrode of the second MOS tube is connected with the negative input end of the first operational amplifier, one end of the seventh resistor, the collector electrode of the second triode and the input end of the temperature sensor circuit; the drain electrode of the third MOS tube is connected with one end of the eighth resistor and one end of the third capacitor, and outputs band-gap reference voltage; the other end of the seventh resistor, the other end of the eighth resistor and the other end of the third capacitor are grounded.
As a specific implementation manner, the temperature sensor circuit includes a fourth MOS transistor, a fifth MOS transistor, a second operational amplifier, a ninth resistor, a tenth resistor, a third triode, and a fourth capacitor; the source electrode of the fourth MOS tube and the source electrode of the fifth MOS tube are connected with a power supply; the grid electrode of the fourth MOS tube is connected with the grid electrode of the fifth MOS tube and is connected with the output end of the second operational amplifier; the drain electrode of the fourth MOS tube is connected with the positive input end of the second operational amplifier and is connected with one end of a ninth resistor; the negative input end of the second operational amplifier is connected with the negative input end of the first operational amplifier; the other end of the ninth resistor is connected with a collector of a third triode, and a base electrode and an emitting electrode of the third triode are grounded; the drain electrode of the fifth MOS tube is connected with one end of a tenth resistor and one end of a fourth capacitor, and outputs temperature detection voltage; the other end of the tenth resistor and the other end of the fourth capacitor are grounded.
As a specific implementation, the current source module includes a first current source, a second current source, and a third current source, and the resistance module includes a third resistance and a fourth resistance; the crystal oscillation circuit further comprises a first controllable switch, a second controllable switch, a third comparator, a fourth comparator and a second RS trigger; the output end of the first current source is connected with one end of the first controllable switch, and the other end of the first controllable switch is connected with one end of the second controllable switch, one end of the adjustable capacitor, the inverting input end of the third comparator and the inverting input end of the fourth comparator; the other end of the second controllable switch is connected with the input end of a second current source, and the output end of the second current source is grounded; the other end of the adjustable capacitor is grounded; the output end of the third current source is connected with one end of a third resistor and the non-inverting input end of a third comparator; the other end of the third resistor is connected with one end of a fourth resistor and the non-inverting input end of a fourth comparator; the other end of the fourth resistor is grounded; the output end of the third comparator is connected with the S input end of the second RS trigger, and the output end of the fourth comparator is connected with the R input end of the second RS trigger; the Q output end of the second RS trigger outputs oscillating voltage and is connected with the control end of the first controllable switch; and the QB output end of the second RS trigger is connected with the control end of the second controllable switch.
Further, the third resistor comprises a second RPPOSAB resistor and a third RPPOSAB resistor; one end of the second RPPOSAB resistor is connected with the output end of the third current source, and the other end of the second RPPOSAB resistor is connected with one end of the third RPPOSAB resistor; and the other end of the third RPPOSAB resistor is connected with one end of the fourth resistor.
The invention has the beneficial effects that:
according to the technical scheme, the band gap reference voltage and the temperature detection voltage are sampled to the logic controller through the ADC module, logic digital operation is carried out through the logic controller, the capacitance value of the adjustable capacitor is adjusted, the frequency of the oscillation signal output by the RC oscillator is adjusted, and the influence of temperature on the oscillation frequency of the RC oscillator is reduced.
Description of the drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. The drawings in the following description are only embodiments of the invention and other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic circuit diagram of an RC oscillator provided in the prior art;
fig. 2 is a block diagram of an overall structure of an RC oscillator with frequency temperature compensation according to an embodiment of the present invention;
fig. 3 is a specific structural block diagram of an RC oscillator with frequency temperature compensation function according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a resistor R3 of an RC oscillator with frequency temperature compensation function according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a bandgap reference voltage source and a temperature sensor circuit of an RC oscillator with frequency temperature compensation according to an embodiment of the present invention;
fig. 6 shows an Enable signal RC Enable, a Temperature-correction Trim Code, a Bandgap reference Voltage sampling bandwidth ADC module sample, a VPTAT Voltage ADC module sample, and a Temperature compensation circuit in an RC oscillator with frequency and Temperature compensation according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a bandgap reference voltage source and a temperature sensor circuit for detecting voltage variation with temperature in an RC oscillator with frequency temperature compensation according to an embodiment of the present invention;
fig. 8 is a graph comparing the oscillation frequency of the RC oscillator with the frequency temperature compensation function provided in the embodiment of the present invention with the oscillation frequency of the RC oscillator provided in the related art.
(specific embodiments) in all cases
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 2, an RC oscillator with frequency temperature compensation function includes a crystal oscillation circuit, a bandgap reference voltage source, a temperature sensor circuit, an ADC module and a logic controller; the crystal oscillation circuit comprises a current source module, a resistance module and an adjustable capacitor C2, and generates and outputs an oscillation signal at least through the resistance module and the adjustable capacitor; the temperature sensor circuit is used for detecting the temperature of the RC oscillator and outputting temperature detection voltage VPTAT (voltage signals converted after the temperature sensor circuit detects the temperature) to the ADC module, and the ADC module collects the temperature detection voltage VPTAT and sends the temperature detection voltage VPTAT to the logic controller; the ADC module also collects a band-gap reference voltage VBG output by the band-gap reference voltage source and sends the band-gap reference voltage VBG to the logic controller; the logic controller adjusts the value of the trimming code trim code according to the band-gap reference voltage VBG and the temperature detection voltage VPTAT, and further adjusts the frequency of the oscillation signal by adjusting the capacitance value of the adjustable capacitor, so that the frequency temperature compensation of the RC oscillator is realized, and the influence of the temperature on the oscillation frequency of the RC oscillator is reduced.
As shown in fig. 2 and 3, in the present embodiment, the current source module includes a first current source IS1A second current source IS2And a third current source IS3The resistance module comprises a third resistor R3 and a fourth resistor R4; the crystal oscillation circuit further comprises a first controllable switch SW1, a second controllable switch SW2, a third comparator COMP3, a fourth comparator COMP4 and a second RS trigger RS 2; a first current source IS1And one end of a first controllable switch SW1The other end of the first controllable switch SW1 is connected to one end of the second controllable switch SW2, one end of the adjustable capacitor C2, the inverting input terminal of the third comparator COMP3 and the inverting input terminal of the fourth comparator COMP4, and the other end of the second controllable switch SW2 is connected to the second current source IS2Is connected to a second current source IS2The output end of the transformer is grounded; the other end of the adjustable capacitor C2 is grounded; a third current source IS3Is connected with one end of a third resistor R3 and the non-inverting input terminal of a third comparator COMP 3; the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the non-inverting input terminal of the fourth comparator COMP 4; the other end of the fourth resistor R4 is grounded; the output end of the third comparator COMP3 is connected with the S input end of the second RS flip-flop RS2, and the output end of the fourth comparator COMP4 is connected with the R input end of the second RS flip-flop RS 2; an output end Q of the second RS trigger RS2 outputs an oscillating voltage CK and is connected with a control end of the first controllable switch SW 1; the output QB of the second RS flip-flop RS2 is connected to the control terminal of the second controllable switch SW 2.
As shown in fig. 4, in the present embodiment, the third resistor R3 includes a second RPPOSAB resistor RPPOSAB2 and a third RPPOSAB resistor RPPOSAB 3; one end of the second RPPOSAB resistor RPPOSAB2 and the third current source IS3Is connected with the other end of the third resistor RPPOSAB3, and the other end of the third resistor RPPOSAB is connected with one end of the third resistor RPPOSAB 3; the other terminal of the third RPPOSAB resistor RPPOSAB3 is connected to one terminal of a fourth resistor R4.
In this embodiment, the third resistor R3 selects two RPPOSAB resistors, and theoretically, the resistor with the smaller temperature coefficient is better, and the RPPOSAB resistor is selected in the CMOS standard process because the temperature coefficient of the resistor is the smallest, so that the influence caused by temperature is reduced, and in practice, the resistor type and the resistance value can be reasonably selected according to specific conditions.
As shown in fig. 5, the bandgap reference voltage source includes a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M3, a first transistor Q1, a second transistor Q2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3, and a first operational amplifier OP 1; the source electrode of the first MOS transistor M1, the source electrode of the second MOS transistor M2 and the source electrode of the third MOS transistor M3 are connected with a power supply VDD; the grid electrode of the first MOS transistor M1, the grid electrode of the second MOS transistor M2 and the grid electrode of the third MOS transistor M3 are connected and connected in parallel with the output end of the first operational amplifier OP 1; the drain of the first MOS transistor M1 is connected to the positive input terminal of the first operational amplifier OP1, one end of the fifth resistor R5, and one end of the sixth resistor R6; the other end of the sixth resistor R6 is connected with the collector of the first triode Q1; the base electrode of the first triode Q1 is connected with the base electrode of the second triode Q2 and is grounded; the emitter of the first triode Q1, the other end of the fifth resistor R5 and the emitter of the second triode Q2 are grounded; the drain electrode of the second MOS transistor M2 is connected to the negative input terminal of the first operational amplifier OP1, one end of the seventh resistor R7, the collector electrode of the second triode Q2 and the input terminal of the temperature sensor circuit; the drain of the third MOS transistor M3 is connected to one end of the eighth resistor R8 and one end of the third capacitor C3, and outputs a bandgap reference voltage VBG; the other end of the seventh resistor R7, the other end of the eighth resistor R8 and the other end of the third capacitor C3 are grounded.
As shown in fig. 5, the temperature sensor circuit includes a fourth MOS transistor M4, a fifth MOS transistor M5, a second operational amplifier OP2, a ninth resistor R9, a tenth resistor R10, a third transistor Q3, and a fourth capacitor C4; the source electrode of the fourth MOS tube M4 and the source electrode of the fifth MOS tube M5 are connected with a power supply VDD; the grid electrode of the fourth MOS tube M4 is connected with the grid electrode of the fifth MOS tube M5 and is connected with the output end of the second operational amplifier OP 2; the drain of the fourth MOS transistor M4 is connected to the positive input terminal of the second operational amplifier OP2, and is connected to one end of the ninth resistor R9; the negative input terminal of the second operational amplifier OP2 is connected to the negative input terminal of the first operational amplifier OP 1; the other end of the ninth resistor R9 is connected with the collector of the third triode Q3, and the base and the emitter of the third triode Q3 are grounded; the drain of the fifth MOS transistor M5 is connected to one end of the tenth resistor R10 and one end of the fourth capacitor C4, and outputs a temperature detection voltage VPTAT; the other terminal of the tenth resistor R10 and the other terminal of the fourth capacitor C4 are grounded.
As shown in fig. 6, the RC oscillator with frequency temperature compensation function provided in this embodiment operates according to the following principle:
firstly, a device in a crystal oscillation circuit receives a power-on enabling signal (RC Enable), acquires calibration information (Trim Code loading) from a storage unit of a chip, and calibrates oscillation voltage output by an RC oscillator to a target frequency; secondly, outputting a band gap reference Voltage VBG by a band gap reference Voltage source, outputting a temperature detection Voltage VPTAT by a temperature sensor circuit, performing sampling conversion of the band gap reference Voltage VBG and the temperature detection Voltage VPTAT by an ADC module, and outputting a band gap reference Voltage sampling value (Bandgap Voltage ADC module sample) and a temperature detection Voltage sampling value (VPTAT Voltage ADC module sample) to a logic controller; and finally, performing logic digital operation by the logic controller, wherein the logic controller outputs Temperature compensation calculation (Temperature compensation), adjusts the capacitance value of the adjustable capacitor C2 and further adjusts the frequency of the oscillation signal output by the RC oscillator.
As shown in fig. 7, the bandgap reference voltage source provided in the embodiment of the present application adopts a multi-stage temperature compensation design, and outputs a bandgap reference voltage VBG with a better temperature compensation characteristic; the temperature sensor circuit provided by the embodiment can output the temperature detection voltage VPTAT with the positive temperature coefficient (mainly considering the first-order temperature coefficient); in this embodiment, in order to track the Temperature characteristic of the RC oscillator in real time, the ADC module is required to sample the bandgap reference voltage VBG and the Temperature detection voltage VPTAT, record the sampled voltages to the logic controller, and then the logic controller obtains a Temperature compensation calculation result (Temperature compensated calculation) by considering the compensation of different Temperature slopes according to the comparison of logic operations, and finally adjusts the current calibration information trim code value to control the capacitance of the adjustable capacitor C2.
As shown in fig. 8, compared with the case that the oscillation frequency of the oscillation voltage output by the RC oscillator increases with the increase of the temperature before the temperature compensation, the temperature stability of the oscillation frequency of the oscillation voltage output by the RC oscillator is greatly improved after the temperature compensation is performed by the RC oscillator provided by the present application; the temperature characteristic of the oscillation frequency of the clock output by the RC oscillator is relatively stable, the slope of the temperature detection voltage VPTAT output by the temperature detection sensor is relatively stable, and the temperature characteristic compensation of the oscillation voltage output by the RC oscillator can be realized through the compensation of the fixed temperature slope.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (5)
1. An RC oscillator with a frequency temperature compensation function comprises a crystal oscillation circuit, wherein the crystal oscillation circuit comprises a current source module, a resistance module and a capacitance module, and the current source module provides current to the resistance module and the capacitance module; the crystal oscillation circuit generates and outputs oscillation voltage according to the voltage of the resistance module and the voltage of the capacitance module;
the method is characterized in that: the capacitance module comprises an adjustable capacitor; the RC oscillator further comprises a band-gap reference voltage source, a temperature sensor circuit, an ADC module and a logic controller; the output end of the temperature sensor circuit is connected to the ADC module, and the ADC module collects temperature detection voltage and sends the temperature detection voltage to the logic controller; the output end of the band-gap reference voltage source is connected to the ADC module, and the ADC module collects the band-gap reference voltage and sends the band-gap reference voltage to the logic controller; and the logic controller adjusts the capacitance value of the adjustable capacitor according to the band gap reference voltage and the temperature detection voltage.
2. The RC oscillator with frequency temperature compensation function according to claim 1, characterized in that: the band-gap reference voltage source comprises a first MOS tube, a second MOS tube, a third MOS tube, a first triode, a second triode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor and a first operational amplifier;
the source electrode of the first MOS tube, the source electrode of the second MOS tube and the source electrode of the third MOS tube are connected with a power supply; the grid electrode of the first MOS tube, the grid electrode of the second MOS tube and the grid electrode of the third MOS tube are connected and connected with the output end of the first operational amplifier in parallel; the drain electrode of the first MOS tube is connected with the positive input end of the first operational amplifier, one end of the fifth resistor and one end of the sixth resistor; the other end of the sixth resistor is connected with the collector of the first triode; the base electrode of the first triode is connected with the base electrode of the second triode and grounded; the emitter of the first triode, the other end of the fifth resistor and the emitter of the second triode are grounded; the drain electrode of the second MOS tube is connected with the negative input end of the first operational amplifier, one end of the seventh resistor, the collector electrode of the second triode and the input end of the temperature sensor circuit; the drain electrode of the third MOS tube is connected with one end of the eighth resistor and one end of the third capacitor, and outputs band-gap reference voltage; the other end of the seventh resistor, the other end of the eighth resistor and the other end of the third capacitor are grounded.
3. The RC oscillator with frequency temperature compensation function according to claim 2, characterized in that: the temperature sensor circuit comprises a fourth MOS tube, a fifth MOS tube, a second operational amplifier, a ninth resistor, a tenth resistor, a third triode and a fourth capacitor; the source electrode of the fourth MOS tube and the source electrode of the fifth MOS tube are connected with a power supply; the grid electrode of the fourth MOS tube is connected with the grid electrode of the fifth MOS tube and is connected with the output end of the second operational amplifier; the drain electrode of the fourth MOS tube is connected with the positive input end of the second operational amplifier and is connected with one end of a ninth resistor; the negative input end of the second operational amplifier is connected with the negative input end of the first operational amplifier; the other end of the ninth resistor is connected with a collector of a third triode, and a base electrode and an emitting electrode of the third triode are grounded; the drain electrode of the fifth MOS tube is connected with one end of a tenth resistor and one end of a fourth capacitor, and outputs temperature detection voltage; the other end of the tenth resistor and the other end of the fourth capacitor are grounded.
4. The RC oscillator with frequency temperature compensation function according to any one of claims 1 to 3, characterized in that: the current source module comprises a first current source, a second current source and a third current source, and the resistance module comprises a third resistance and a fourth resistance; the crystal oscillation circuit further comprises a first controllable switch, a second controllable switch, a third comparator, a fourth comparator and a second RS trigger; the output end of the first current source is connected with one end of the first controllable switch, and the other end of the first controllable switch is connected with one end of the second controllable switch, one end of the adjustable capacitor, the inverting input end of the third comparator and the inverting input end of the fourth comparator; the other end of the second controllable switch is connected with the input end of a second current source, and the output end of the second current source is grounded; the other end of the adjustable capacitor is grounded; the output end of the third current source is connected with one end of a third resistor and the non-inverting input end of a third comparator; the other end of the third resistor is connected with one end of a fourth resistor and the non-inverting input end of a fourth comparator; the other end of the fourth resistor is grounded; the output end of the third comparator is connected with the S input end of the second RS trigger, and the output end of the fourth comparator is connected with the R input end of the second RS trigger; the Q output end of the second RS trigger outputs oscillating voltage and is connected with the control end of the first controllable switch; and the QB output end of the second RS trigger is connected with the control end of the second controllable switch.
5. The RC oscillator with frequency temperature compensation function of claim 4, wherein: the third resistor comprises a second RPPOSAB resistor and a third RPPOSAB resistor; one end of the second RPPOSAB resistor is connected with the output end of the third current source, and the other end of the second RPPOSAB resistor is connected with one end of the third RPPOSAB resistor; and the other end of the third RPPOSAB resistor is connected with one end of the fourth resistor.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421889A (en) * | 2022-01-20 | 2022-04-29 | 深圳市灵明光子科技有限公司 | High-precision oscillator |
| CN114679135A (en) * | 2022-05-27 | 2022-06-28 | 浙江地芯引力科技有限公司 | Oscillator circuit, frequency adjusting method, chip, electronic device, and storage medium |
| CN114900175A (en) * | 2022-07-11 | 2022-08-12 | 上海泰矽微电子有限公司 | Low-power-consumption capacitive touch sensing detection circuit |
-
2021
- 2021-03-15 CN CN202110278238.0A patent/CN113162583A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421889A (en) * | 2022-01-20 | 2022-04-29 | 深圳市灵明光子科技有限公司 | High-precision oscillator |
| CN114679135A (en) * | 2022-05-27 | 2022-06-28 | 浙江地芯引力科技有限公司 | Oscillator circuit, frequency adjusting method, chip, electronic device, and storage medium |
| CN114900175A (en) * | 2022-07-11 | 2022-08-12 | 上海泰矽微电子有限公司 | Low-power-consumption capacitive touch sensing detection circuit |
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