CN114915528B - Modulation circuit and transmitter - Google Patents
Modulation circuit and transmitter Download PDFInfo
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- CN114915528B CN114915528B CN202210431356.5A CN202210431356A CN114915528B CN 114915528 B CN114915528 B CN 114915528B CN 202210431356 A CN202210431356 A CN 202210431356A CN 114915528 B CN114915528 B CN 114915528B
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- 230000010355 oscillation Effects 0.000 claims abstract description 43
- 238000012545 processing Methods 0.000 claims abstract description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
-
- 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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
Abstract
The application provides a modulation circuit, comprising: the local oscillation module is used for generating local oscillation signals; the control module is used for processing the input signal to obtain a control signal; the modulation module is electrically connected with the local oscillation module and the control module, and is used for modulating the local oscillation signal and adjusting the modulation power of the local oscillation signal according to the control signal. The application also provides a transmitter. Therefore, the modulation circuit and the transmitter provided by the application can realize the modulation of the local oscillation signal and control the modulation power of the local oscillation signal through the control signal.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a modulation circuit and a transmitter.
Background
With the continuous development of communication technology, transmitters are increasingly widely used, and the transmitters generally comprise a modulation circuit for modulating a local oscillation signal (for example, quadrature phase shift keying modulation), however, the modulation circuit has no effective control mechanism when modulating the local oscillation signal, so that the performance of the modulated signal is poor.
Disclosure of Invention
In view of the above, the present application provides a modulation circuit and a transmitter, which can modulate a local oscillation signal and control the modulation power of the local oscillation signal by a control signal.
In a first aspect, the present application provides a modulation circuit comprising: the local oscillation module is used for generating local oscillation signals; the control module is used for processing the input signal to obtain a control signal; the modulation module is electrically connected with the local oscillation module and the control module, and is used for modulating the local oscillation signal and adjusting the modulation power of the local oscillation signal according to the control signal.
In some possible implementations, the control module further includes a signal generator for generating two input signals that are orthogonal to each other.
In some possible implementations, the control module further includes a signal receiver configured to receive the multiple external signals, and a combiner electrically connected to the signal receiver, the combiner configured to combine the multiple external signals into two input signals.
In some possible implementations, the combiner includes a plurality of latches electrically connected to the signal receiver, the plurality of latches for latching the plurality of external signals according to the clock signal, and a first selector electrically connected to the plurality of latches, the first selector for selecting the latched plurality of external signal outputs according to the clock signal to obtain the two input signals.
In some possible implementations, the modulation module includes a modulator and a transformer, the modulator is electrically connected to the control module and the local oscillation module, the modulator is configured to modulate the local oscillation signal according to the control signal to obtain a modulation signal, the transformer is electrically connected to the modulator, and the transformer is configured to adjust a voltage value of the modulation signal.
In some possible implementations, the control module further includes a driver for enhancing a driving capability of the input signal, and an encoder electrically connected to the driver for encoding the input signal.
In some possible implementations, the control module includes a controller electrically connected to the encoder, the controller configured to derive the control signal based on the encoded input signal.
In some possible implementations, the control module adjusts the modulation power by adjusting a duty cycle of the control signal to control the modulation module to be in an active state or an inactive state.
In some possible implementations, the local oscillator signal includes four paths of signals that are orthogonal to each other.
In a second aspect, the present application provides a transmitter comprising the modulation circuit described above.
Therefore, the modulation circuit and the transmitter provided by the application can realize the modulation of the local oscillation signal and control the modulation power of the local oscillation signal through the control signal.
Drawings
Fig. 1 is a block diagram of a modulation circuit according to the present application.
Fig. 2 is a circuit diagram of a modulation circuit according to embodiment 1 of the present application.
Fig. 3 is a circuit diagram of a modulation circuit provided in embodiment 2 of the present application.
Fig. 4 is a circuit diagram of a merging unit in embodiment 2 of the present application.
FIG. 5 is a signal timing diagram of the merging unit of FIG. 4.
Fig. 6 is a circuit diagram of a modulation circuit according to embodiment 3 of the present application.
Description of the main reference signs
Modulation circuits 100, 200, 300
Control module 10
Signal generator 101
Data receiver 102
Combiner 103
Latches L1, L2, L3, L4, L5
Merging unit 1031
First selector 1032
Second selector 104
Driver 105
Encoder 106
Controller 107
Local oscillation module 20
Modulation module 30
Modulator 301
Transformer 302
The application will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In the embodiments of the present application, the terms "first," "second," and the like are used merely for distinguishing between different objects, and are not to be construed as indicating or implying a relative importance or order. For example, a first application, a second application, etc. are intended to distinguish between different applications, rather than to describe a particular order of application, and features defining "first", "second", etc. may explicitly or implicitly include one or more such features.
Referring to fig. 1, a schematic diagram of a modulation circuit 100 according to the present application is shown. The modulation circuit 100 may be applied to a transmitter, where the modulation circuit 100 is configured to modulate a local oscillator signal to obtain a modulated signal. The modulation circuit 100 includes a control module 10, a local oscillation module 20, and a modulation module 30.
The control module 10 is electrically connected to the modulation module 30, and the local oscillation module 20 is electrically connected to the modulation module 30.
The local oscillation module 20 is configured to generate a local oscillation signal. Alternatively, the local oscillator module 20 may be a quadrature voltage controlled oscillator (Quadrature Voltage-Controlled Oscillator, QVCO), a frequency multiplier, etc., and it is understood that the local oscillator module 20 may generate four local oscillator signals with orthogonality, i+, I-, q+, Q-local oscillator signals, respectively. The control module 10 is configured to process an input signal to obtain a control signal. Alternatively, the input signal may be a pseudo-random binary sequence, or a two-way serial data signal, and in some possible implementations, the control module 10 may enhance the driving capability of the input signal, encode the input signal, and convert the encoded input signal to obtain the control signal. Wherein the control signal may be used to adjust the modulation power of the local oscillator signal.
The modulation module 30 is configured to modulate the local oscillation signal according to the control signal. Optionally, the modulation module 30 performs quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK) modulation on the local oscillator signal. The modulation module 30 may adjust the modulation power to the local oscillator signal according to the control signal.
Example 1
Referring to fig. 2, a circuit diagram of a modulation circuit 100 according to embodiment 1 of the present application is shown. The control module 10 includes a signal generator 101, a driver 105, an encoder 106, and a controller 107, and the modulation module 30 includes a modulator 301 and a transformer 302.
The signal generator 101 is electrically connected to the driver 105, the driver 105 is electrically connected to the encoder 106, the encoder 106 is electrically connected to the controller 107, the controller is electrically connected to the modulator 301, and the modulator 301 is electrically connected to the local oscillation module 20 and the transformer 302.
The signal generator 101 is for generating an input signal. Alternatively, the signal generator 101 may be a Pseudo-random binary sequence (PRBS) generator and the input signal may be a Pseudo-random binary sequence. In some possible implementations, the input signal includes I, Q two signals. It will be appreciated that the I, Q input signals are 90 out of phase, i.e. I, Q input signals are orthogonal to each other. The driver 105 is used to enhance the driving capability of the input signal. Specifically, the driver 105 may integrate the signal waveforms of the input signals, alternatively, the driver 105 may shape the waveforms of the input signals into square waves to enhance the driving capability of the input signals.
The encoder 106 is used for encoding the input signal. Specifically, the encoder 106 may encode the input signal corresponding to different modulation modes, for example, when the modulation module 30 performs QPSK modulation on the local oscillation signal, the encoder 106 may encode the input signal corresponding to the QPSK modulation mode, so that the input signal may control the modulation power of the local oscillation signal in the QPSK modulation mode.
The controller 107 is configured to output a control signal according to the encoded input signal to control the modulation power of the modulation module 30. Specifically, the controller 107 may output a control signal with a specific duty ratio according to the encoded information in the encoded input signal, for example, when the encoded information is "1", the control signal is used to control the modulator 301 to enter an operating state, i.e. the modulator 301 modulates the local oscillation signal, and when the encoded information is "0", the control signal is used to control the modulator 301 to enter a non-operating state, i.e. the modulator 301 stops modulating the local oscillation signal. It will be appreciated that the control signal may control the modulator 301 to be active or inactive by a particular duty cycle to adjust the modulation power of the modulation module 30.
The modulator 301 is configured to modulate a local oscillation signal according to a control signal. Optionally, the modulator 301 may include a digital power amplifier (DigitalPowerAmplifier, DPA) for amplifying the local oscillator signal. In some possible implementations, the modulator 301 includes a plurality of modulating units, where the number of modulating units may be consistent with the number of signal paths of the local oscillation signals, for example, when the local oscillation signals include 4 paths of signals orthogonal to each other, the number of modulating units may be 4, so as to modulate the local oscillation signals of each path, and the modulator 301 modulates the local oscillation signals to obtain modulated signals.
The transformer 302 is used to regulate the voltage of the modulated signal. It will be appreciated that the transformer 302 may also improve isolation of the modulated signal.
Example 2
Referring to fig. 3, a circuit diagram of a modulation circuit 200 according to embodiment 1 of the present application is shown. The modulation circuit 200 provided in embodiment 2 differs from the modulation circuit 100 provided in embodiment 1 in that: in the modulation circuit 200, the control module 10 includes a data receiver 102, a combiner 103, a driver 105, an encoder 106, and a controller 107.
The data receiver 102 is electrically connected to the combiner 103, the combiner 103 is electrically connected to the driver 105, the driver 105 is electrically connected to the encoder 106, the encoder 106 is electrically connected to the controller 107, the controller is electrically connected to the modulator 301, and the modulator 301 is electrically connected to the local oscillation module 20 and the transformer 302.
The data receiver 102 is used for receiving an external signal. Specifically, the external signal may be a multi-path differential signal, which may be generated by external electronic components and input to the data receiver 102 through a low voltage differential signal (LowVoltageDifferenceSignal, LVDS) interface.
The combiner 103 is configured to combine the external signals into two paths of the input signals. Specifically, since the data receiving rate of the LVDS interface is limited, parallel-to-serial conversion is required for multiple external signals to obtain high-speed serial data. The combiner 103 may perform parallel-to-serial conversion on the multiple external signals to obtain two input signals, thereby improving the data transmission rate.
The structure and functions of the driver 105, the encoder 106 and the controller 107 are the same as those in embodiment 1 and embodiment 2, and thus are not described here again.
Referring to fig. 4, in embodiment 2, the combiner 103 includes a plurality of combining units 1031, each combining unit 1031 is configured to combine two external signals into one input signal, and it is understood that the plurality of combining units 1031 can be cascaded to combine multiple external signals into two input signals.
The combining unit 1031 includes latches L1-L5 and a first selector 1032, the latch L1 receives a first external signal, the latch L3 receives a second external signal, the latches L2 and L5 are electrically connected to the first selector 1032, and the latches L1-L5 and the first selector 1032 are controlled by clock signals, which can be generated by an external clock source.
It will be appreciated that the frequency of the clock signal is associated with the operating state of latches L1-L5. The latches L1 to L5 latch the external signal according to the level value of the clock signal, and output the latched external signal to the first selector 1032.
In some possible implementations, the latches L1, L3, and L5 latch the external signal when the clock signal is high, and the latches L2, L4 latch the external signal when the clock signal is low.
Specifically, referring to fig. 5, in some possible implementations, the first external signal includes a data element D1, a data source D3, and a data element D5, and the second external signal includes a data element D2, a data source D4, and a data element D6. Latch L1 receives the first external signal and latch L3 receives the second external signal.
At time t1-t2, the clock signal is high, and the latches L1, L3, and L5 start to operate, and the latch L1 samples and latches the data element D1, and the latch L3 samples and latches the data element D2. Since the data element is not input to the latches L5 and L2 at this time, the latches L5 and L2 also output no data element, and the first selector 1032 has no data element to be selected, i.e. outputs no signal.
At time t2-t3, the clock signal is low, the latches L2 and L4 start to operate, the latch L2 samples and latches the data element D1, the latch L4 samples and latches the data element D2, and at this time, the data element is not input to the latch L5, so the latch L5 also outputs the data element temporarily, and the first selector 1032 selects the data element D1 latched by the latch L2 as the data element output of the input signal.
At time t3-t4, the clock signal is high, and the latches L1, L3, and L5 start to operate, the latch L1 samples and latches the data element D3, the latch L3 samples and latches the data element D4, and the latch L5 samples and latches the data element D2, and at this time, the latch L2 does not operate, so the first selector 1032 selects the data element D2 latched by the latch L5 as the data element output of the input signal.
Thus, the combining unit 1031 may implement parallel-to-serial conversion of multiple external signals through the latches L1-L5 and the first selector 1032, thereby improving a data transmission rate.
Example 3
Referring to fig. 6, a circuit diagram of a modulation circuit 300 according to embodiment 3 of the present application is shown. The modulation circuit 300 provided in embodiment 3 differs from the modulation circuit 100 provided in embodiment 1 in that: the control module 10 further comprises a data receiver 102, a combiner 103, a second selector 104, a driver 105, an encoder 106, and a controller 107.
The signal generator 101 is electrically connected to the second selector 104, the data receiver 102 is electrically connected to the combiner 103, the combiner 103 is electrically connected to the second selector 104, the second selector 104 is electrically connected to the driver 105, the driver 105 is electrically connected to the encoder 106, the encoder 106 is electrically connected to the controller 107, the controller is electrically connected to the modulator 301, and the modulator 301 is electrically connected to the local oscillator module 20 and the transformer 302.
The structures and functions of the signal generator 101, the data receiver 102, and the combiner 103 are the same as those of the embodiments 1 and 2, and thus are not described here again.
The second selector 104 is used to select the input signal generated by the signal generator 101 or the input signal combined by the combiner 103 as a new input signal, and outputs to the driver 105. It will be appreciated that the second selector 104 may derive four differential input signals to control the modulation of the four local oscillator signals.
The present application also provides a transmitter comprising any one of the modulation circuits 100, 200, and 300. Therefore, the modulation circuit and the transmitter provided by the application can control the modulation power of the local oscillation signal through the control signal, provide an effective control mechanism and enhance the performance of the modulation signal.
It will be appreciated by persons skilled in the art that the above embodiments have been provided for the purpose of illustrating the application and are not to be construed as limiting the application, and that suitable modifications and variations of the above embodiments are within the scope of the application as claimed.
Claims (8)
1. A modulation circuit, comprising:
the local oscillation module is used for generating local oscillation signals;
the control module is used for processing the input signal to obtain a control signal;
the modulation module is electrically connected with the local oscillation module and the control module, and is used for modulating the local oscillation signal and adjusting the modulation power of the local oscillation signal according to the control signal;
the control module comprises an encoder and a controller, the encoder is electrically connected to the controller, the encoder is used for encoding an input signal corresponding to a modulation mode of the modulation module, the controller is used for outputting a control signal with a corresponding duty ratio according to encoded information in the encoded input signal, and the control module is used for controlling the modulation module to be in a working state or a non-working state by adjusting the duty ratio of the control signal so as to adjust the modulation power.
2. The modulation circuit of claim 1, wherein the control module further comprises a signal generator for generating two paths of the input signals that are orthogonal to each other.
3. The modulation circuit of claim 2, wherein the control module further comprises a signal receiver for receiving multiple external signals and a combiner electrically connected to the signal receiver for combining the multiple external signals into two input signals.
4. The modulation circuit as claimed in claim 3, wherein the combiner comprises a plurality of latches electrically connected to the signal receiver, the plurality of latches for latching the plurality of external signals according to a clock signal, and a first selector electrically connected to the plurality of latches, the first selector for selecting the latched plurality of external signal outputs according to the clock signal to obtain two paths of the input signals.
5. The modulation circuit of claim 1, wherein the modulation module comprises a modulator and a transformer, the modulator is electrically connected to the control module and the local oscillator module, the modulator is configured to modulate the local oscillator signal according to the control signal to obtain a modulated signal, the transformer is electrically connected to the modulator, and the transformer is configured to adjust a voltage value of the modulated signal.
6. The modulation circuit of claim 1, wherein the control module further comprises a driver for enhancing a driving capability of the input signal, the driver being electrically connected to the encoder.
7. The modulation circuit of claim 1, wherein the local oscillator signal comprises four paths of signals that are orthogonal to each other.
8. A transmitter comprising a modulation circuit as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210431356.5A CN114915528B (en) | 2022-04-22 | 2022-04-22 | Modulation circuit and transmitter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210431356.5A CN114915528B (en) | 2022-04-22 | 2022-04-22 | Modulation circuit and transmitter |
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| CN114915528A CN114915528A (en) | 2022-08-16 |
| CN114915528B true CN114915528B (en) | 2023-09-26 |
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Effective date of registration: 20240717 Address after: 518057 room A302, Research Institute building, Tsinghua University, South District, high tech Industrial Park, Nanshan District, Shenzhen City, Guangdong Province Patentee after: RESEARCH INSTITUTE OF TSINGHUA University IN SHENZHEN Country or region after: China Patentee after: TSINGHUA University Address before: 518057 room A302, Research Institute building, Tsinghua University, South District, high tech Industrial Park, Nanshan District, Shenzhen City, Guangdong Province Patentee before: RESEARCH INSTITUTE OF TSINGHUA University IN SHENZHEN Country or region before: China |