CN212413126U - Electrically tunable filter - Google Patents
Electrically tunable filter Download PDFInfo
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- CN212413126U CN212413126U CN202020932668.0U CN202020932668U CN212413126U CN 212413126 U CN212413126 U CN 212413126U CN 202020932668 U CN202020932668 U CN 202020932668U CN 212413126 U CN212413126 U CN 212413126U
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Abstract
The embodiment of the utility model discloses an electric tunable filter, which comprises an integrated control module, a digital-to-analog conversion module and an electric tunable filter array; the control module comprises a data signal receiving port, a clock signal receiving port, a chip selection signal receiving port and a trigger signal receiving port; the digital-to-analog conversion module is respectively and electrically connected with the electrically tunable filter array and the control module; the control module is used for being in an awakening state at the enabling stage of the chip selection signal and the trigger signal and controlling the electric regulation filter to establish a radio frequency signal transmission channel according to a data signal and a clock signal in the awakening state; and entering a dormant state after the enabling stages of the chip selection signal and the trigger signal are finished, and transmitting the radio frequency signal in the dormant state. The embodiment of the utility model discloses an electric accent wave filter reduces the clock signal that control module produced and to radio frequency signal transmission's influence, improves electric accent wave filter's precision, reduces electric accent wave filter's average power.
Description
Technical Field
The embodiment of the utility model provides a relate to the electric speed regulation filtering technology field, especially relate to an electric speed regulation filter.
Background
The electric tuning frequency modulation filter is used as a band-pass radio frequency device, and due to the adjustable center frequency, various forming modes, high speed, flexible frequency modulation mode and interference resistance, the electric tuning frequency modulation filter is more and more appeared in a communication base station, relay equipment and a portable handheld terminal, and develops towards the direction of miniaturization and intellectualization. However, the production, debugging and testing processes are time-consuming, labor-consuming and high in workload.
Fig. 1 is a schematic diagram of an electrical tilt filtering operation principle adopted in the prior art, and as shown in fig. 1, a conventional electrical tilt filter only includes an electrical tilt filter array 102, and when the electrical tilt filter array 102 is used for filtering, a user controls the electrical tilt filter array 102 through a digital-to-analog converter 101 by using a microprocessor 100, so that the electrical tilt filter array 102 can realize a filtering function.
In the prior art, because a microprocessor used by a user and an electrically tunable filter array are mutually independent, the microprocessor in the electrically tunable filter array is required to be used by the user to generate control voltage, and the nonlinearity of a capacitance diode in the electrically tunable filter array restricts the performance of the filter in the practical use process, so that the problems of frequency offset, standing wave offset and large insertion loss are easy to occur. Meanwhile, the microprocessor and the electrically tunable filter array are mutually independent, the use is troublesome, the optimal position of the electrically tunable filter array is difficult to accurately select, and the problem that the control voltage of the filter is difficult to pair is more easily caused by the cascade connection of a plurality of filters. If the microprocessor is directly integrated in the electrically tunable filter array to form the filter, because the distance between the microprocessor and the electrically tunable filter array is too short, a clock pulse signal generated when the microprocessor works will generate harmonic interference, so that the working performance of the electrically tunable filter array is influenced, and meanwhile, the power consumption of the filter is too large, so that the miniaturization and portable trend of devices is difficult to realize.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a pair of electric adjusting filter, aim at reduce the influence of the clock signal that integrated control module produced in the wave filter to radio frequency signal transmission, improve electric adjusting filter's precision, reduce electric adjusting filter's power, solved the clock signal that control module produced and influenced radio frequency signal transmission's problem.
To achieve the purpose, the embodiment of the utility model discloses an electric tunable filter, which comprises an integrated control module, a digital-to-analog conversion module and an electric tunable filter array;
the control module comprises a data signal receiving port, a clock signal receiving port, a chip selection signal receiving port and a trigger signal receiving port, wherein the data signal receiving port is used for receiving a data signal, the clock signal receiving port is used for receiving a clock signal, the chip selection signal receiving port is used for receiving a chip selection signal, and the trigger signal receiving port is used for receiving a trigger signal;
the digital-to-analog conversion module is electrically connected with the electrically tunable filter array and the control module respectively;
the control module is used for being in an awakening state at the enabling stage of the chip selection signal and the trigger signal and controlling the electric tilt filter to establish a radio frequency signal transmission channel according to the data signal and the clock signal in the awakening state; and entering a dormant state after the enabling stages of the chip selection signal and the trigger signal are finished, and transmitting radio frequency signals in the dormant state.
Optionally, the control module further includes a central processing unit, a storage and a cache region, and the central processing unit is electrically connected to the storage and the cache region respectively;
the storage stores the optimal stepping value of the radio frequency channel;
the buffer area comprises a first buffer area and a second buffer area, and the first buffer area is used for buffering the data signals; the central processing unit is used for determining an optimal stepping value corresponding to the data signal according to a preset program and the data signal; the second buffer region is used for buffering the preferred stepping value.
Optionally, the digital-to-analog conversion module further includes a register;
the register is electrically connected with the central processing unit, and the central processing unit is also used for transmitting the optimal stepping value to the register according to the trigger signal;
the digital-to-analog conversion module is used for generating a tuning voltage corresponding to the preferred stepping value according to the preferred stepping value.
Optionally, the electrically tunable filter array includes at least one varactor diode, and the varactor diode is configured to change a capacitance value according to the tuning voltage, so that the electrically tunable filter is at a center frequency required by a radio frequency signal transmission channel.
Optionally, the tunable filter further includes an amplifying circuit, an input end of the amplifying circuit is electrically connected to the digital-to-analog conversion module, and an output end of the amplifying circuit is electrically connected to the tunable filter array, and is configured to amplify the tuning voltage.
Optionally, the digital-to-analog conversion module is integrally disposed in the control module;
the control module comprises a central processing unit, and the digital-to-analog conversion module is electrically connected with the central processing unit;
or, the digital-to-analog conversion module is independently arranged in the electrically tunable filter, the control module comprises a connecting terminal, and the digital-to-analog conversion module is electrically connected with the connecting terminal.
Optionally, the digital-to-analog conversion module is electrically connected to the electrically tunable filter array through at least one analog voltage transmission line.
Optionally, the clock signal receiving port includes at least one of a serial peripheral interface, a pin interface, and a two-wire serial interface.
Optionally, the electrically tunable filter array includes at least one independently arranged electrically tunable filter unit;
the electrically tunable filter also comprises a radio frequency signal input interface and a radio frequency signal output interface;
the radio frequency signal input end of the electric regulation filtering unit is electrically connected with the radio frequency signal input interface;
and the radio frequency signal output end of the electric regulation filtering unit is electrically connected with the radio frequency signal output interface.
Optionally, the digital-to-analog conversion module includes at least one independently arranged digital-to-analog converter;
when the digital-to-analog conversion module comprises a plurality of digital-to-analog converters which are independently arranged, the number of bits of the digital-to-analog converters is the same; or the plurality of digital-to-analog converters at least comprise a first digital-to-analog converter and a second digital-to-analog converter, wherein the number of bits of the first digital-to-analog converter is different from that of the second digital-to-analog converter.
The embodiment of the utility model discloses electric accent wave filter, through with control module, digital analog conversion module and electric accent filter array integrated in electric accent wave filter inside together, improve the integrated level of wave filter, convenient to use, easily operation. The chip selection signal and the trigger signal are received through the chip selection signal receiving port and the trigger signal receiving port, so that the chip selection signal and the trigger signal are in an awakening state in an enabling stage of the chip selection signal, meanwhile, the awakening state is utilized to call a stepping value meeting requirements according to a data signal and a clock signal, the chip selection signal and the trigger signal enter a dormant state after the enabling stage of the chip selection signal and the trigger signal is ended, after the trigger signal is received, the control module is awakened again, the stepping value meeting the requirements is transmitted by utilizing the awakening state again, a radio frequency signal transmission channel is established, then the chip selection signal and the trigger signal enter the dormant state again, the transmission of the radio frequency signal is carried out by utilizing the dormant state, the interference of the radio frequency signal generated by the control module in the transmission process is reduced, the transmission quality of the radio frequency signal is improved, the influence of the decline of, the influence of the clock frequency and each harmonic thereof on the channel sensitivity is completely eliminated, the precision of the filter is improved, and meanwhile, the whole power consumption of the filter is reduced by utilizing the dormant state of the control module.
Drawings
Fig. 1 is a schematic diagram of an operation principle of an electrical modulation filter adopted in the prior art.
Fig. 2 is a schematic structural diagram of an electrically tunable filter provided in an embodiment of the present invention.
Fig. 3 is a schematic diagram for waking up a control module according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of another electrically tunable filter provided by an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of another electrically tunable filter provided in an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of another electrically tunable filter provided in the embodiment of the present invention.
Detailed Description
In order to make the technical problem solved, the technical solution adopted and the technical effect achieved by the embodiments of the present invention clearer, the technical solution of the present invention is further described below by referring to the accompanying drawings and by means of specific embodiments.
Fig. 2 is a schematic structural diagram of an electrical tunable filter provided in an embodiment of the present invention, as shown in fig. 2, an embodiment of the present invention provides an electrical tunable filter, which includes an integrated control module 1, a digital-to-analog conversion module 2, and an electrical tunable filter array 3;
the control module 1 comprises a data signal receiving port 11, a clock signal receiving port 12, a chip selection signal receiving port 13 and a trigger signal receiving port 14, wherein the data signal receiving port 11 is used for receiving a data signal, the clock signal receiving port 12 is used for receiving a clock signal, the chip selection signal receiving port 13 is used for receiving a chip selection signal, and the trigger signal receiving port 14 is used for receiving a trigger signal;
the digital-to-analog conversion module 1 is respectively and electrically connected with the electrically tunable filter array 3 and the control module 2;
the control module 1 is used for being in an awakening state at the enabling stage of the chip selection signal and the trigger signal and controlling the electric regulation filter to establish a radio frequency signal transmission channel according to a data signal and a clock signal in the awakening state; and entering a dormant state after the enabling stages of the chip selection signal and the trigger signal are finished, and transmitting the radio frequency signal in the dormant state.
The control module 1 is capable of adjusting the running state according to user operation by freely awakening the control module 1 through a chip selection signal and a trigger signal, so that the controllability is improved, the control module 1 is awakened according to the chip selection signal, simultaneously calls a stepping value meeting requirements according to a data signal, enters a dormant state after calling the stepping value meeting the requirements, then awakens the control module 1 again according to the trigger signal, the control module 1 transmits the stepping value meeting the requirements into the analog-digital conversion module 2 and then enters the dormant state again, and the analog-digital conversion module 2 generates a corresponding tuning electric power according to the stepping value meeting the requirements The VF is pressed and transmitted to the electrically tunable filter array 3, so that a radio frequency signal transmission channel is established to transmit radio frequency signals, the control module 1 is in a dormant state in the transmission process of the radio frequency signals, the interference of the radio frequency signals by clock signals generated by the control module 1 in the transmission process is reduced, the transmission quality of the radio frequency signals is improved, the influence of the clock frequency and the reduction of the channel sensitivity at each subharmonic is eliminated, the influence of the electrically tunable filter on the signal-to-noise ratio of the whole machine is reduced, the influence of the clock frequency and each subharmonic thereof on the channel sensitivity is completely eliminated, the precision of the filter is improved, and meanwhile, the overall power consumption of the filter is reduced by utilizing the dormant state of the control module. For example, fig. 3 is a schematic diagram of a wake-up of a control module according to an embodiment of the present invention. As shown in fig. 3, the first sleep period is B, the second sleep period is a, and the rf signal transmission process occurs in the control module 1 within the sleep period a.
It will be appreciated that the clock signal generated by the control module 1 is formed by the superposition of a fundamental frequency sinusoidal signal and its multiple harmonic signals, for example, when the clock signal is 26MHz, the channel bandwidth is typically 5MHz, and the clock signal will have a serious influence on the operating frequency of the rf signal with frequencies of 26M, 52M, 78M, 104M, 130M, 156M, 182M, 208M, 234M, 260M, 286M, 312M, 338M, 364M, 390M, 416M, 442M, 468M, 494M, 520M, 546M, and the sensitivity of the filter will be seriously reduced due to the interference of the clock signal. Illustratively, the control module 1 is in a sleep state at the beginning, when the control module receives the chip selection signal and the data signal, the chip selection signal wakes up the control module 1, the control module 1 calls a step value meeting the user requirement according to the data signal, and then the control module 1 enters the sleep state. When the control module receives the trigger signal, the control module 1 is awakened again by the trigger signal, and the control module 1 enters the dormant state again after transmitting the stepping value meeting the requirement to the analog-to-digital conversion module 2. The tuning voltage VF is generated through the processing of the analog-to-digital conversion module 2, meanwhile, the tuning voltage VF is transmitted to the electrically tunable filter array 3 through the analog-to-digital conversion module 2, and a radio frequency signal transmission channel is established by the electrically tunable filter array according to the tuning voltage VF to transmit radio frequency signals.
Optionally, the control module 1 further includes a central processing unit 15, a storage 16, and a buffer 17, where the central processing unit 15 is electrically connected to the storage 16 and the buffer 17, respectively;
the memory 16 stores the step value corresponding to the radio frequency channel;
the buffer 17 includes a first buffer 171 and a second buffer 172, the first buffer 171 is used for buffering data signals; the central processing unit 15 is used for determining an optimal stepping value corresponding to the data signal according to a preset program and the data signal; the second buffer 172 is used to buffer the preferred step values.
The cpu 15 controls the data signal transmitted from the data signal receiving port 11 to be buffered in the first buffer 171, temporarily stores the data signal of the user, selects the step value corresponding to the rf channel pre-stored in the memory 16 according to the data signal, and retrieves the preferred step value satisfying the data signal into the second buffer 172. The chip selection signal and the trigger signal are in the wake-up control module 1 in the enabling stage, the step value meeting the requirement is called according to the data signal and the clock signal by using the wake-up state, the chip selection signal and the trigger signal enter the dormant state after the enabling stage is ended, and the stage of calling the optimal step value meeting the data signal is reused in the previous radio frequency signal transmission stage, so that the whole transmission smoothness is improved, the working time is saved, and the efficiency is improved.
With continued reference to fig. 2, optionally, the digital-to-analog conversion module 2 further comprises a register 21;
the register 21 is electrically connected with the central processing unit 15, and the central processing unit 15 is further used for transmitting the optimized stepping value to the register 21 according to the trigger signal;
the analog-to-digital conversion module 2 is configured to generate a tuning voltage VF corresponding to the preferred step value according to the preferred step value.
Receive the preferred step value that control module 1 selected to transfer out through register 21 for analog-to-digital conversion module 2 generates tuning voltage VF according to preferred step value, when avoiding artifical debugging voltage, because varactor nonlinear attribute causes the reference voltage change, and the great condition of control error takes place, thereby makes to pair the wave filter more accurate, need not carry out artifical calculation simultaneously and pairs, simplifies work step, improves analog-to-digital conversion module 2 treatment effeciency.
Optionally, the electrically tunable filter array 3 includes at least one varactor diode (not shown in the figure), and the varactor diode is used for changing a capacitance value according to the tuning voltage VF, so that the electrically tunable filter is at a center frequency required by the radio frequency signal transmission channel.
The analog-to-digital conversion module 2 loads the generated tuning voltage VF at two ends of the variable capacitance diode in the electrically tunable filter array 3, so that the capacitance value of the variable capacitance diode is changed, the electrically tunable filter can be in the central frequency required by the radio frequency signal transmission channel according to the user data signal, the control mode is simple, the operation is easy, the effect is obvious, and the efficiency of establishing the radio frequency transmission channel is improved.
Fig. 4 is a schematic structural diagram of another electrically tunable filter provided in the embodiment of the present invention, as shown in fig. 4, optionally, the digital-to-analog conversion module 2 is integrally disposed inside the control module 1; the control module 1 comprises a central processing unit 15, and the digital-to-analog conversion module 2 is electrically connected with the central processing unit 15;
or, with reference to fig. 2, the digital-to-analog conversion module 2 is independently disposed in the electrically tunable filter, the control module 1 includes a connection terminal 18, and the digital-to-analog conversion module 2 is electrically connected to the connection terminal 18.
Integrate digital analog conversion module 2 in control module 1's inside, the further volume that reduces the wave filter promotes the light and exquisite portability of wave filter, simultaneously, integrate digital analog conversion module 2 in control module 1's inside, improved digital analog conversion module 2 and control module 1's data transmission efficiency to the work efficiency of wave filter has been improved.
With reference to fig. 4, optionally, the tunable filter further includes an amplifying circuit 6, an input end of the amplifying circuit 6 is electrically connected to the digital-to-analog conversion module 2, and an output end of the amplifying circuit 6 is electrically connected to the tunable filter array 3, and is configured to amplify the tuning voltage.
Tuning voltage VF output by the digital-to-analog conversion module 2 is amplified through the amplifying circuit 6, so that the electrically tunable filter array 3 can be more easily acquired, and the control precision and accuracy are improved. It can be understood that the tuning voltage VF output by the digital-to-analog conversion module 2 is amplified by the amplifying circuit 6 and then loaded into at least one varactor diode in the electrically tunable filter array 3, so that the loading voltages at two ends of the varactor diode are changed according to the tuning voltage VF output by the digital-to-analog conversion module 2, thereby changing the capacitance value of the varactor diode and enabling radio frequency channels to be established according to voltages of different requirements.
Optionally, the digital-to-analog conversion module 2 is electrically connected to the electrically tunable filter array 3 through at least one analog voltage transmission cable 22.
Optionally, the clock signal receiving port 12 includes at least one of a serial peripheral interface, a pin interface, and a two-wire serial interface.
The clock signal receiving port 12 is a data Interface capable of performing communication, and includes a Serial Peripheral Interface (SPI), a PIN Interface (PIN), and a two-wire Serial Interface (I2C). Illustratively, the serial peripheral interface is adopted, and an external client clock signal is transmitted through the serial peripheral interface, so that the control module is simply and easily awakened, and the working efficiency is improved.
Fig. 5 is a schematic structural diagram of another electrically tunable filter provided in an embodiment of the present invention, as shown in fig. 5, optionally, the electrically tunable filter array 3 includes at least one independently disposed electrically tunable filter unit 31;
the electrically tunable filter also comprises a radio frequency signal input interface 7 and a radio frequency signal output interface 8;
the radio frequency signal input end of the electric regulation filtering unit 31 is electrically connected with the radio frequency signal input interface 7;
the radio frequency signal output end of the electric tuning filtering unit 31 is electrically connected with the radio frequency signal output interface 8.
Radio frequency signals of the electric regulation filter enter through a radio frequency signal input interface 7 and are transmitted to each electric regulation filtering unit, and radio frequency output signals of each filtering unit are output through a radio frequency signal output interface 8. And the signal of each filtering unit is ensured to be normally received and quickly reacted.
Illustratively, the set electrically tunable filter array 3 includes a plurality of independently set electrically tunable filter units 31, a radio frequency signal input end of each electrically tunable filter unit 31 is electrically connected to the radio frequency signal input interface 7, and radio frequency signal output ends of the electrically tunable filter units 31 are electrically connected to the radio frequency signal output interface 8. The set electrically tunable filter array 3 includes a plurality of independently set electrically tunable filter units 31, and the filter frequency bands of a plurality of different electrically tunable filter units 31 may be the same or different. When the filtering frequency bands of a plurality of different electrically tunable filtering units 31 are the same, a plurality of same frequency bands can be obtained after filtering by the electrically tunable filtering array 3, and the plurality of same frequency bands can be mutually referenced to verify the filtering accuracy of the different electrically tunable filtering units 31; when the filtering frequency bands of the plurality of different electrically tunable filtering units 31 are different, a plurality of different frequency bands can be obtained after the filtering of the electrically tunable filtering array 3, and the plurality of different frequency bands can be combined with each other, so that the filtering range of the electrically tunable filtering array 3 is ensured to be large.
Fig. 6 is a schematic structural diagram of another electrically tunable filter provided in an embodiment of the present invention, as shown in fig. 6, optionally, the digital-to-analog conversion module 2 includes at least one digital-to-analog converter independently disposed;
when the digital-to-analog conversion module 2 comprises a plurality of digital-to-analog converters which are independently arranged, the number of bits of the plurality of digital-to-analog converters is the same; or the plurality of digital-to-analog converters comprises at least a first digital-to-analog converter 23 and a second digital-to-analog converter 24, wherein the number of bits of the first digital-to-analog converter 23 is different from the number of bits of the second digital-to-analog converter 24.
For example, a plurality of digital-to-analog converters of different bit numbers can be matched to different output voltages, e.g. VF1And VF2The size of the tunable filter module can be different, and the application range of the tunable filter module is enlarged.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.
Claims (10)
1. An electrically tunable filter is characterized by comprising an integrated control module, a digital-to-analog conversion module and an electrically tunable filter array;
the control module comprises a data signal receiving port, a clock signal receiving port, a chip selection signal receiving port and a trigger signal receiving port, wherein the data signal receiving port is used for receiving a data signal, the clock signal receiving port is used for receiving a clock signal, the chip selection signal receiving port is used for receiving a chip selection signal, and the trigger signal receiving port is used for receiving a trigger signal;
the digital-to-analog conversion module is electrically connected with the electrically tunable filter array and the control module respectively;
the control module is used for being in an awakening state at the enabling stage of the chip selection signal and the trigger signal and controlling the electric tilt filter to establish a radio frequency signal transmission channel according to the data signal and the clock signal in the awakening state; and entering a dormant state after the enabling stages of the chip selection signal and the trigger signal are finished, and transmitting radio frequency signals in the dormant state.
2. The electrically tunable filter according to claim 1, wherein the control module further comprises a central processing unit, a storage and a buffer area, the central processing unit being electrically connected to the storage and the buffer area, respectively;
the storage stores the optimal stepping value of the radio frequency channel;
the buffer area comprises a first buffer area and a second buffer area, and the first buffer area is used for buffering the data signals; the central processing unit is used for determining an optimal stepping value corresponding to the data signal according to a preset program and the data signal; the second buffer region is used for buffering the preferred stepping value.
3. The electrically tunable filter according to claim 2, wherein the digital-to-analog conversion module further comprises a register;
the register is electrically connected with the central processing unit, and the central processing unit is also used for transmitting the optimal stepping value to the register according to the trigger signal;
the digital-to-analog conversion module is used for generating a tuning voltage corresponding to the preferred stepping value according to the preferred stepping value.
4. The electrically tunable filter according to claim 3, wherein the electrically tunable filter array comprises at least one varactor diode, and the varactor diode is configured to change a capacitance value according to the tuning voltage, so that the electrically tunable filter is at a center frequency required by a radio frequency signal transmission channel.
5. The electrically tunable filter according to claim 4, further comprising an amplifying circuit, wherein an input end of the amplifying circuit is electrically connected to the digital-to-analog conversion module, and an output end of the amplifying circuit is electrically connected to the electrically tunable filter array, and is configured to amplify the tuning voltage.
6. The electrically tunable filter according to claim 1, wherein the digital-to-analog conversion module is integrally disposed in the control module;
the control module comprises a central processing unit, and the digital-to-analog conversion module is electrically connected with the central processing unit;
or, the digital-to-analog conversion module is independently arranged in the electrically tunable filter, the control module comprises a connecting terminal, and the digital-to-analog conversion module is electrically connected with the connecting terminal.
7. The electrically tunable filter according to claim 1, wherein the digital-to-analog conversion module is electrically connected to the electrically tunable filter array through at least one analog voltage transmission line.
8. The electrically tunable filter of claim 1, wherein the clock signal receiving port comprises at least one of a serial peripheral interface, a pin interface, and a two-wire serial interface.
9. The electrically tunable filter according to claim 1, wherein the electrically tunable filter array comprises at least one independently disposed electrically tunable filter unit;
the electrically tunable filter also comprises a radio frequency signal input interface and a radio frequency signal output interface;
the radio frequency signal input end of the electric regulation filtering unit is electrically connected with the radio frequency signal input interface;
and the radio frequency signal output end of the electric regulation filtering unit is electrically connected with the radio frequency signal output interface.
10. The electrically tunable filter according to claim 1, wherein the digital-to-analog conversion module comprises at least one independently arranged digital-to-analog converter;
when the digital-to-analog conversion module comprises a plurality of digital-to-analog converters which are independently arranged, the number of bits of the digital-to-analog converters is the same; or the plurality of digital-to-analog converters at least comprise a first digital-to-analog converter and a second digital-to-analog converter, wherein the number of bits of the first digital-to-analog converter is different from that of the second digital-to-analog converter.
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| CN202020932668.0U CN212413126U (en) | 2020-05-28 | 2020-05-28 | Electrically tunable filter |
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| CN202020932668.0U CN212413126U (en) | 2020-05-28 | 2020-05-28 | Electrically tunable filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113794482A (en) * | 2021-07-29 | 2021-12-14 | 三维通信股份有限公司 | Electrically tunable bandpass filter, radio frequency receiving link and communication system |
| CN117130671A (en) * | 2023-01-16 | 2023-11-28 | 荣耀终端有限公司 | System wake-up method, electronic equipment and computer readable storage medium |
-
2020
- 2020-05-28 CN CN202020932668.0U patent/CN212413126U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113794482A (en) * | 2021-07-29 | 2021-12-14 | 三维通信股份有限公司 | Electrically tunable bandpass filter, radio frequency receiving link and communication system |
| CN117130671A (en) * | 2023-01-16 | 2023-11-28 | 荣耀终端有限公司 | System wake-up method, electronic equipment and computer readable storage medium |
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