CN107171644B - Modulation signal generating circuit based on phase adjuster - Google Patents
Modulation signal generating circuit based on phase adjuster Download PDFInfo
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- CN107171644B CN107171644B CN201610130619.3A CN201610130619A CN107171644B CN 107171644 B CN107171644 B CN 107171644B CN 201610130619 A CN201610130619 A CN 201610130619A CN 107171644 B CN107171644 B CN 107171644B
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
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- 239000000463 material Substances 0.000 claims description 3
- 230000010354 integration Effects 0.000 abstract description 6
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- RDYMFSUJUZBWLH-UHFFFAOYSA-N endosulfan Chemical compound C12COS(=O)OCC2C2(Cl)C(Cl)=C(Cl)C1(Cl)C2(Cl)Cl RDYMFSUJUZBWLH-UHFFFAOYSA-N 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B23/00—Generation of oscillations periodically swept over a predetermined frequency range
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Abstract
The invention relates to a modulation signal generating circuit based on a phase adjuster, which is used for outputting two different modulation signals and comprises: the phase adjuster has a group delay characteristic, and an input end of the phase adjuster is used for receiving an input signal and expanding each frequency component in the input signal on a time domain according to a frequency relation; one end of the switch is connected with the output end of the phase modulator; the switch is used for controlling the phase adjuster to generate two different group delay responses corresponding to odd mode and even mode responses; the phase adjuster processes the input signal according to the two group delay responses and outputs two different modulation signals through the other end of the switch. Compared with the traditional two circuits, the modulation signal generating circuit based on the phase adjuster has good integration and low power consumption.
Description
Technical Field
The present invention relates to the field of analog signal processing technologies, and in particular, to a modulation signal generation circuit based on a phase adjuster.
Background
Chirp is a coded pulse technique in the field of communications, and is a modulation technique in which the frequency of a signal changes with time. A Chirp signal is a signal whose frequency changes with time. In the conventional chirp modulation process, two circuits are required to generate two responses to output two different modulation signals to modulate symbols 0 and 1 respectively. This modulation method has low integration and high power consumption.
Disclosure of Invention
In view of this, it is necessary to provide a phase adjuster-based modulation signal generation circuit with good integration and low power consumption.
A phase adjuster-based modulation signal generation circuit for outputting two different modulation signals, comprising: the phase adjuster has a group delay characteristic, and an input end of the phase adjuster is used for receiving an input signal and expanding each frequency component in the input signal on a time domain according to a frequency relation; one end of the switch is connected with the output end of the phase modulator; the switch is used for controlling the phase adjuster to generate two different group delay responses corresponding to odd mode and even mode responses; the phase adjuster processes the input signal according to the two group delay responses and outputs two different modulation signals through the other end of the switch.
In one embodiment, the phase adjuster comprises an amplitude control unit and a phase control unit connected in series with each other; the amplitude control unit is used for controlling the amplitude adjusting capability of the phase adjuster, and the phase control unit is used for controlling the phase adjusting capability of the phase adjuster to obtain the group delay required by the phase adjuster.
In one embodiment, the phase control unit comprises a C-type section; the two ends of the C-shaped section, which are positioned at the opening side, are respectively used as an input end and an output end, and the width of the two ends, which are close to the input end and the output end, of the C-shaped section is greater than the width of the middle position of the C-shaped section.
In one embodiment, the phase control unit comprises a plurality of C-shaped sections connected in series; the plurality of C-shaped segments vary in size.
In one embodiment, the C-shaped section is an all-pass structure.
In one embodiment, the amplitude control unit comprises an impedance inverter; the impedance inverter includes transmission lines coupled to each other and arranged in parallel.
In one embodiment, the width of the input and output of the impedance inverter is greater than the width of the transmission line elsewhere, the transmission line being a quarter wavelength long.
In one embodiment, the amplitude control unit and the phase control unit are made of copper material.
In one embodiment, the system further comprises a modulator; the output end of the modulator is connected with the input end of the phase adjuster; the modulator is used for modulating an input signal.
In one embodiment, the modulated signal is used for chirp modulation.
In the modulation signal generation circuit based on the phase adjuster, the phase adjuster can generate two group delay responses corresponding to odd mode and even mode responses through the control of the switch, so that the phase adjuster can output two modulation signals to modulate a target signal. Compared with the traditional two circuits for generating two responses, the modulation signal generation circuit has good integration and low power consumption.
Drawings
Fig. 1 is a block diagram of a modulated signal generating circuit based on a phase adjuster in an embodiment;
FIG. 2 is a schematic diagram of a modulation signal generating circuit based on a phase adjuster according to another embodiment;
fig. 3 is a schematic diagram of chirp modulation performed on the signal in fig. 2 after passing through a modulation signal generation circuit based on a phase adjuster;
fig. 4 is a circuit diagram of a phase adjuster according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below 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.
The modulation signal generation circuit based on the phase adjuster in one embodiment is used for outputting two different modulation signals to modulate a target signal. Fig. 1 is a block diagram of a modulation signal generation circuit based on a phase adjuster in an embodiment. Referring to fig. 1, the phase adjuster-based modulation signal generation circuit includes a phase adjuster 110 and a switch 120. One end of the switch 120 is connected to the output terminal of the phase adjuster 110.
An input of the phase adjuster (Phaser)110 is for receiving an input signal. The phase adjuster 110 has a dispersive group delay characteristic so that frequency components in the input signal can be spread out in the time domain according to a frequency relation, i.e., the signal is adjusted and processed by changing the phase of the signal. Group delay is a quantity used to describe how fast the phase change varies with frequency. The relationship between the group delay and the frequency (and also the group delay response) of the phase adjuster 110 may be linear or non-linear. In the present embodiment, the group delay of the phase adjuster 110 has a linear relationship with the frequency, so that each frequency component in the input signal can be spread in the time domain according to the frequency size relationship.
The switch 120 has two states, closed and open. When switch 120 is closed, the entire circuit behaves as a short circuit, corresponding to an odd mode response; when switch 120 is open, the entire circuit behaves as an open circuit, corresponding to an even mode response. The phase adjuster 110 generates two different group delay responses under the open and close control of the switch 120. Different group delay responses enable the same frequency component in the input signal to have different group delays, so that the input signal is processed differently to obtain two different modulation signals, and the two modulation signals are output through the other end of the switch 120. The resulting modulated signal may be used in chirp modulation to modulate symbols 0 and 1 to obtain the desired chirp signal. The obtained modulation signal can also be used in other frequency modulation processes, and is not limited to chirp modulation.
In the above-mentioned modulation signal generation circuit based on the phase adjuster, the control of the switch 120 can make the phase adjuster 110 generate two group delay responses corresponding to the odd-mode and even-mode responses, so that the phase adjuster 110 can output two modulation signals to modulate the target signal. Compared with the traditional two circuits for generating two responses, the modulation signal generation circuit has good integration and low power consumption.
Fig. 2 is a block diagram of a modulation signal generation circuit based on a phase adjuster in another embodiment. Referring to fig. 2, the modulation signal generating circuit includes a modulator 210, a phase adjuster (Phaser)220, and a switch 230. The modulator 210, the phase adjuster 220, and the switch 230 are connected in sequence.
The modulator 210 is used to modulate an input signal. Specifically, the modulators 210 receive the carrier signals X, respectively2(t) and modulated Signal X1(t) and using the modulated signal X1(t) for the carrier signal X2(t) modulating to obtain a signal containing a carrier signal X2(t) input signal X of envelope information1(t)X2(t) of (d). Input signal X generated by modulator 2101(t)X2(t) is shown in FIG. 3.
The phase adjuster 220 is used for the input signal X1(t)X2(t) processing to obtain two different modulated signals. The phase adjuster 220 includes an amplitude control unit and a phase control unit connected in series with each other. The amplitude control unit is used to control the amplitude adjustment capability of the phase adjuster 220, and the phase control unit is used to control the phase adjustment capability of the phase adjuster 220 to obtain the group delay required by the phase adjuster 220. Fig. 4 is a circuit diagram of a phase adjuster 220 according to an embodiment. The phase adjuster 220 includes a C-type section 410 and an impedance inverter 420. The C-type section 410 and the impedance inverter 420 are connected in series with each other. Impedance inverter 420 is used to control the amplitude of the two-port network of phase adjuster 220, and C-section 410 is used to control the phase of the two-port network. In the present embodiment, the C-shaped section 410 includes a plurality of C-shaped sections arranged in series, and the sizes of the C-shaped sections are different. The two ends of the opening side of the C-shaped section 410 are an input end and an output end, respectively. The width of the C-shaped section 410 near the input and output ends is greater than the width of the middle of the C-shaped section 410. The C-shaped section 410 is a full pass structure. The impedance inverter 420 includes transmission lines coupled to each other and arranged in parallel. The width of the input and output of the impedance inverter 420 is larger than the width of the transmission line elsewhere to ensure good contact. Therefore, the specific dimensions (e.g., length, width, and spacing) of the impedance inverter 420 and the C-type section 410 are designed to produce the group delay (group delay is phase) required by the phase adjuster 220Negative of the derivative of). In this embodiment, the C-shaped section 410 and the impedance inverter 420 are made of copper, which is a common material for a general PCB.
The specific dimensions of the C-section 410 and the impedance inverter 420 are determined as follows:
first, the phase can be derived from the desired group delay (group delay is the negative derivative of the phase). Then, through the phase, the S parameters S11 (input reflection coefficient, used to characterize return loss) and S21 (forward transmission coefficient, used to characterize insertion loss) of this two-port network can be obtained according to the odd-even mode theory. The amplitudes of S11 and S21 can be achieved by the impedance inverter 420, and the phases of S11 and S21 can be achieved by the C-section 420. Specifically, the desired amplitudes of S11 and S12 can be imported into the ADS by matlab, and the optimization is performed with the amplitude as the optimization target and the length, width and interval size of the impedance inverter 420 as the optimization variables. Theoretically, the length of the impedance inverter 420 is a quarter wavelength, and the width and spacing can be optimized or tuned as long as the amplitudes of S11 and S21 are the desired amplitudes. Similarly, the impedance inverter 420 is connected in series with the C-section 410, and the size of the C-section 410 is optimized to obtain the relevant size for the desired group delay. The specific dimensions of the C-section 410 and the impedance inverter 420 are not unique corresponding to the desired amplitude phase. The C-section 410 is an all-pass structure with an amplitude of 1 and a phase that can be set as desired. An embodiment will be described below as an example. The designed group delay is as follows:
τ1(Ω)＝2Ω2+τ0-1
τ-1(Ω)＝-2Ω2+τ0+1
the corresponding phase can be obtained according to the relation between the group delay and the phase:
obtaining an S parameter of the two-port network according to a correlation theory:
therefore, the sizes of the C-type section 410 and the impedance inverter 420 can be determined according to the obtained S parameter; that is, the response of the phase adjuster 220 may be set as desired.
The switch 230 has two states, closed and open. The phase adjuster 220 is capable of generating two different group delay responses corresponding to the two states of the switch 230. In the present embodiment, when the switch 230 is closed, the group delay response generated by the phase adjuster 220 has a positive slope, and when the switch 230 is open, the group delay response generated by the phase adjuster 220 has a negative slope, as shown in fig. 3. In fig. 3, the group delay response generated by the phase adjuster (Phaser)220 under the control of the switch 230 is a linear function with frequency on the abscissa and group delay on the ordinate. For the group delay response of the positive slope, the group delay is small when the frequency is low, and the group delay is large when the frequency is high; for the group delay response with negative slope, the group delay is large when the frequency is low, and the group delay is small when the frequency is high. Therefore, when the group delay response of the phase adjuster 220 is a positive slope after an input signal having different frequency components passes through the phase adjuster 220, the delay of the low frequency component in the input signal is smaller, the low frequency component will appear earlier in the output signal, the delay of the high frequency component in the input signal is larger, and the high frequency component will appear later in the output signal; when the group delay response of the phase adjuster 220 is a negative slope, the high frequency component of the input signal is delayed less and will appear earlier in the output signal, the low frequency component of the input signal is delayed more and will appear later in the output signal. The output signal is used as a modulation signal for signal modulation. In this embodiment, frequency modulation of chirp is taken as an example for explanation. The two output modulated signals modulate chirp-modulated symbols 0 and 1, respectively, and the modulated signals are as shown in fig. 3.
The phase adjuster-based modulation signal generation circuit controls the phase adjuster 220 through the switch 230 by using the microwave odd-even mode circuit theory to generate two responses for generating a Chirp modulation signal. Compared with the traditional two circuits which generate two responses, the modulation signal generating circuit based on the phase adjuster has good integration and low power consumption. Moreover, the group delay response of the phase adjuster 220 can be designed arbitrarily as required, thereby meeting different requirements.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A phase adjuster-based modulation signal generation circuit for outputting two different modulation signals, comprising:
the phase adjuster has a group delay characteristic, and an input end of the phase adjuster is used for receiving an input signal and expanding each frequency component in the input signal on a time domain according to a frequency relation; and
one end of the switch is connected with the output end of the phase modulator; the switch is used for controlling the phase adjuster to generate two different group delay responses corresponding to odd mode and even mode responses; the phase adjuster processes the input signal according to the two group delay responses and outputs two different modulation signals through the other end of the switch;
wherein the phase adjuster comprises an amplitude control unit and a phase control unit which are connected in series with each other; the amplitude control unit is used for controlling the amplitude adjusting capability of the phase adjuster, and the phase control unit is used for controlling the phase adjusting capability of the phase adjuster to obtain the group delay required by the phase adjuster.
2. The phase adjuster-based modulation signal generation circuit according to claim 1, wherein the phase control unit includes a C-type section; the two ends of the C-shaped section, which are positioned at the opening side, are respectively used as an input end and an output end, and the width of the two ends, which are close to the input end and the output end, of the C-shaped section is greater than the width of the middle position of the C-shaped section.
3. The phase adjuster-based modulation signal generation circuit according to claim 2, wherein the phase control unit includes a plurality of C-type sections connected in series with each other; the plurality of C-shaped segments vary in size.
4. The phase adjuster-based modulation signal generation circuit according to claim 2, wherein the C-type section is an all-pass structure.
5. The phase adjuster-based modulation signal generation circuit according to claim 1, wherein the amplitude control unit includes an impedance inverter; the impedance inverter includes transmission lines coupled to each other and arranged in parallel.
6. The phase adjuster-based modulation signal generation circuit according to claim 5, wherein the width of the input and output ends of the impedance inverter is larger than the width of the other positions of the transmission line, which is a quarter wavelength long.
7. The phase adjuster-based modulation signal generation circuit according to claim 1, wherein the amplitude control unit and the phase control unit are each made of a copper material.
8. The phase adjuster-based modulated signal generating circuit according to claim 1, further comprising a modulator; the output end of the modulator is connected with the input end of the phase adjuster; the modulator is used for modulating an input signal.
9. The phase adjuster-based modulated signal generating circuit according to claim 1, wherein the modulated signal is used for chirp modulation.
10. The phase adjuster-based modulated signal generating circuit according to claim 1, wherein the phase adjuster has a linear relationship between group delay and frequency.
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| CN103516435A (en) * | 2013-09-22 | 2014-01-15 | 西南交通大学 | Chirp microwave pulse signal generation method and device based on electro-optic external modulation nonlinear effect |
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- 2016-03-08 CN CN201610130619.3A patent/CN107171644B/en active Active
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| CN1975905A (en) * | 2005-11-29 | 2007-06-06 | 松下电器产业株式会社 | Phase adjustment circuit |
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| CN102594262A (en) * | 2011-01-09 | 2012-07-18 | 联发科技股份有限公司 | Polar transmitter and signal transmitting method |
| CN102291154A (en) * | 2011-09-23 | 2011-12-21 | 电子科技大学 | Polar coordinate transmitter |
| CN102843194A (en) * | 2012-09-12 | 2012-12-26 | 武汉邮电科学研究院 | Chromatic dispersion compensating system and method for wavelength selector switch type ROADM (Reconfigurable Optical Add Drop Multiplexer) |
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