CN114039552B - Mixer and communication device - Google Patents
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- CN114039552B CN114039552B CN202111145685.5A CN202111145685A CN114039552B CN 114039552 B CN114039552 B CN 114039552B CN 202111145685 A CN202111145685 A CN 202111145685A CN 114039552 B CN114039552 B CN 114039552B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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Abstract
本发明适用于混频器技术领域，提供了一种混频器及通信装置，上述混频器包括：混频模块及180度电桥；混频模块的第一输入端用于输入本振信号，混频模块的第二输入端用于输入射频信号，混频模块的第一输出端与180度电桥的第一输入端连接，混频模块的第二输出端与180度电桥的第二输入端连接，180度电桥的输出端用于输出目标信号；混频模块用于对本振信号和射频信号进行混频，并分别由混频模块的第一输出端及混频模块的第二输出端输出两路幅值相同、相位相差180度的混频信号。本发明通过混频模块及180度电桥构建差分网络，提高了端口的隔离度。
The present invention is applicable to the technical field of mixers, and provides a mixer and a communication device, wherein the mixer comprises: a mixer module and a 180-degree bridge; the first input end of the mixer module is used to input a local oscillator signal, the second input end of the mixer module is used to input a radio frequency signal, the first output end of the mixer module is connected to the first input end of the 180-degree bridge, the second output end of the mixer module is connected to the second input end of the 180-degree bridge, and the output end of the 180-degree bridge is used to output a target signal; the mixer module is used to mix the local oscillator signal and the radio frequency signal, and two mixed signals with the same amplitude and a phase difference of 180 degrees are output from the first output end of the mixer module and the second output end of the mixer module respectively. The present invention constructs a differential network through the mixer module and the 180-degree bridge, thereby improving the isolation of the port.
Description
Technical Field
The present invention relates to a mixer, and more particularly to a mixer and a communication device.
Background
The microwave millimeter wave backhaul has the advantages of low cost, robust effect and the like, and is widely applied in the field of communication. The mixer plays an important role in the microwave millimeter wave backhaul network as a key of frequency variation.
The single-ended mixer is the most basic mixer architecture, and the single-ended mixer has the advantages of simple structure, smaller power consumption and lower cost, but the port isolation is poor, and the practical application requirement cannot be met.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a mixer and a communication device, so as to solve the problem of poor isolation of the single-ended mixer port in the prior art.
A first aspect of an embodiment of the present invention provides a mixer, comprising a mixing module and a 180 degree bridge;
The first input end of the frequency mixing module is used for inputting local oscillation signals, the second input end of the frequency mixing module is used for inputting radio frequency signals, the first output end of the frequency mixing module is connected with the first input end of the 180-degree bridge, the second output end of the frequency mixing module is connected with the second input end of the 180-degree bridge, and the output end of the 180-degree bridge is used for outputting target signals;
the frequency mixing module is used for mixing the local oscillation signal and the radio frequency signal, and two paths of frequency mixing signals with the same amplitude value and 180-degree phase difference are respectively output by the first output end of the frequency mixing module and the second output end of the frequency mixing module.
Optionally, the frequency mixing module comprises a frequency mixing unit, a first 90-degree bridge and a second 90-degree bridge;
The first input end of the frequency mixing unit is a first input end of the frequency mixing module, the second input end of the frequency mixing unit is a second input end of the frequency mixing module, the first output end of the frequency mixing unit and the fourth output end of the frequency mixing unit are respectively connected with the first input end of the first 90-degree bridge and the second input end of the first 90-degree bridge, and the second output end of the frequency mixing unit and the third output end of the frequency mixing unit are respectively connected with the first input end of the second 90-degree bridge and the second input end of the second 90-degree bridge;
The output end of the first 90-degree bridge is a first output end of the frequency mixing module, and the output end of the second 90-degree bridge is a second output end of the frequency mixing module;
The frequency mixing unit is used for mixing the local oscillation signal and the radio frequency signal, and four paths of frequency mixing signals with the same amplitude and phase difference of 90 degrees are respectively output from four output ends of the frequency mixing unit.
Optionally, the frequency mixing unit comprises a first frequency mixer, a second frequency mixer, a third frequency mixer, a fourth frequency mixer, a third 90-degree electric bridge, a fourth 90-degree electric bridge, a fifth 90-degree electric bridge, a sixth 90-degree electric bridge, a seventh 90-degree electric bridge and a power divider;
The input end of the power divider is a first input end of the mixing unit, the first output end of the power divider is connected with the input end of the third 90-degree bridge, and the second output end of the power divider is connected with the input end of the fourth 90-degree bridge;
The input end of the fifth 90-degree electric bridge is a second input end of the mixing unit, the first output end of the fifth 90-degree electric bridge is connected with the input end of the sixth 90-degree electric bridge, and the second output end of the fifth 90-degree electric bridge is connected with the input end of the seventh 90-degree electric bridge;
the first input end of the first mixer is connected with the first output end of the third 90-degree bridge, and the second input end of the first mixer is connected with the first output end of the sixth 90-degree bridge;
the first input end of the second mixer is connected with the second output end of the third 90-degree bridge, and the second input end of the second mixer is connected with the second output end of the sixth 90-degree bridge;
The first input end of the third mixer is connected with the first output end of the fourth 90-degree bridge, and the second input end of the third mixer is connected with the first output end of the seventh 90-degree bridge;
the first input end of the fourth mixer is connected with the second output end of the fourth 90-degree bridge, and the second input end of the fourth mixer is connected with the second output end of the seventh 90-degree bridge;
the output end of the first mixer is a first output end of the mixing unit, the output end of the second mixer is a second output end of the mixing unit, the output end of the third mixer is a third output end of the mixing unit, and the output end of the fourth mixer is a fourth output end of the mixing unit.
Optionally, the first mixer, the second mixer, the third mixer and the fourth mixer are all single-ended mixers.
Optionally, the phase of the local oscillator signal isThe phase of the radio frequency signal is
The phase of the signal at the first output end of the third 90-degree bridge isThe phase of the signal at the second output end of the third 90-degree bridge isThe phase of the signal at the first output end of the fourth 90-degree bridge isThe phase of the signal at the second output end of the fourth 90-degree bridge is
The phase of the signal at the first output end of the fifth 90-degree bridge isThe phase of the signal at the second output end of the fifth 90-degree bridge is
The phase of the signal at the first output end of the sixth 90-degree bridge isThe phase of the signal at the second output end of the sixth 90-degree bridge isThe phase of the signal at the first output end of the seventh 90-degree bridge isThe phase of the signal at the second output end of the seventh 90-degree bridge is
The phase of the signal at the output end of the first mixer isThe phase of the signal at the output end of the second mixer isThe phase of the signal at the output end of the third mixer isThe phase of the signal at the output of the fourth mixer is
Optionally, the phase of the signal at the output of the first 90 degree bridge isThe phase of the signal at the output end of the second 90-degree bridge is
Optionally, the mixer further comprises a first DC bias unit, a second DC bias unit, a third DC bias unit and a fourth DC bias unit;
The first end of the first direct current bias unit is connected with the first output end of the frequency mixing unit, the first end of the fourth direct current bias unit is connected with the fourth output end of the frequency mixing unit, and the second end of the first direct current bias unit and the second end of the fourth direct current bias unit are respectively connected with the first input end of the first 90-degree bridge and the second input end of the first 90-degree bridge;
The first end of the second direct current bias unit is connected with the second output end of the frequency mixing unit, the first end of the third direct current bias unit is connected with the third output end of the frequency mixing unit, and the second end of the second direct current bias unit and the second end of the third direct current bias unit are respectively connected with the first input end of the second 90-degree bridge and the second input end of the second 90-degree bridge.
Optionally, the circuit structures of the first dc bias unit, the second dc bias unit, the third dc bias unit and the fourth dc bias unit are the same.
Optionally, the first direct current bias unit comprises a first capacitor, a second capacitor, an inductor and a resistor;
The first end of the first capacitor is a first end of the first direct current bias unit, and the second end of the first capacitor is a second end of the first direct current bias unit;
the inductor and the resistor are connected in series between the first end of the first capacitor and the direct current power supply end;
The first end of the second capacitor is connected with the direct current power supply end, and the second end of the second capacitor is grounded.
A second aspect of the embodiment of the present invention provides a communication device, including the mixer provided in the first aspect of the embodiment of the present invention.
The embodiment of the invention provides a mixer and a communication device, wherein the mixer comprises a mixing module and a 180-degree bridge, a first input end of the mixing module is used for inputting local oscillator signals, a second input end of the mixing module is used for inputting radio frequency signals, a first output end of the mixing module is connected with a first input end of the 180-degree bridge, a second output end of the mixing module is connected with a second input end of the 180-degree bridge, an output end of the 180-degree bridge is used for outputting target signals, and the mixing module is used for mixing the local oscillator signals and the radio frequency signals and respectively outputting two paths of mixing signals with the same amplitude value and 180 degrees phase difference through the first output end of the mixing module and the second output end of the mixing module. According to the embodiment of the invention, two paths of mixed signals with the same amplitude value and 180 degrees phase difference are formed through the mixing module, and then the mixed signals are output through 180-degree bridge combination, so that a differential network is constructed, and the isolation of ports is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a mixer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a mixer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a mixer according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of yet another mixer according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a first DC bias unit according to an embodiment of the present invention;
Fig. 6 is a comparison diagram of isolation between a mixer provided with a dc bias unit and a mixer not provided with a dc bias unit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
Referring to fig. 1, a first aspect of an embodiment of the present invention provides a mixer comprising a mixing module 1 and a 180 degree bridge 2.
The first input end of the frequency mixing module 1 is used for inputting local oscillation signals, the second input end of the frequency mixing module 1 is used for inputting radio frequency signals, the first output end of the frequency mixing module 1 is connected with the first input end of the 180-degree bridge 2, the second output end of the frequency mixing module 1 is connected with the second input end of the 180-degree bridge 2, and the output end of the 180-degree bridge 2 is used for outputting target signals.
The frequency mixing module 1 is used for mixing the local oscillation signal and the radio frequency signal, and two paths of frequency mixing signals with the same amplitude and 180-degree phase difference are respectively output by a first output end of the frequency mixing module 1 and a second output end of the frequency mixing module 1.
The 180-degree bridge can divide an input signal into two signals which are equal in amplitude and have a 180-degree phase difference, or combine two signals which are equal in amplitude and have a 180-degree phase difference into one signal. According to the embodiment of the invention, two paths of mixed signals with the same amplitude and 180-degree phase difference are formed through the mixing module 1, then the mixed signals are output through the 180-degree bridge 2 in a combined way, a differential network is constructed, the leakage signals of the local oscillator are decomposed into two signals with the same amplitude and opposite phases, and referring to fig. 2, the signals are canceled after the combined way, so that the isolation degree of the port is improved.
In some embodiments, referring to fig. 3, the mixing module 1 includes a mixing unit 11, a first 90 degree bridge 12, and a second 90 degree bridge 13.
The first input end of the mixing unit 11 is the first input end of the mixing module 1, the second input end of the mixing unit 11 is the second input end of the mixing module 1, the first output end of the mixing unit 11 and the fourth output end of the mixing unit 11 are respectively connected with the first input end of the first 90-degree bridge 12 and the second input end of the first 90-degree bridge 12, and the second output end of the mixing unit 11 and the third output end of the mixing unit 11 are respectively connected with the first input end of the second 90-degree bridge 13 and the second input end of the second 90-degree bridge 13.
The output end of the first 90-degree bridge 12 is a first output end of the mixing module 1, and the output end of the second 90-degree bridge 13 is a second output end of the mixing module 1.
The mixing unit 11 is configured to mix the local oscillation signal and the radio frequency signal, and four output ends of the mixing unit 11 output four mixing signals with the same amplitude and phase difference of 90 degrees in sequence.
The 90-degree bridge can divide one input signal into two signals which are equal in amplitude and have a 90-degree phase difference, or combine two signals which are equal in amplitude and have a 90-degree phase difference into one signal. In the embodiment of the invention, four paths of mixed signals with the same amplitude and sequentially different phases by 90 degrees are formed through the mixing unit 11. For example, the four mixed signals have phases of respectivelyθ,And theta + pi, wherein two paths of signals are combined through the first 90-degree electric bridge 12 to form one path of signals, the other two paths of signals are combined through the second 90-degree electric bridge 13 to form a second path of signals, and the amplitude values of the two paths of signals are the same, and the phase difference is 180 degrees. For example, the phase isTwo paths of signals with theta are combined to form a path of signal with phase theta, and the phase isAnd two paths of signals with theta+pi are combined to form a first path of signal with phase theta+pi, or the phase theta+pi isAnd theta and two signals are combined to form a phase asThe phase of the signal of (2) is theta+pi sumTwo paths of signals are combined to form a first path of phaseIs a signal of (a). According to the embodiment of the invention, two 90-degree bridges are adopted to realize quadrature networks with different phase combinations, so that the image frequency suppression degree of the mixer is improved, a network with good differential characteristics is further constructed, the impedance of the mixer port is good, and the isolation degree of the mixer port is improved. Meanwhile, four paths of quadrature signals (the four paths of mixing signals with the same amplitude and the phase difference of 90 degrees in sequence) are adopted, so that the dynamic range of the mixer is improved.
In some embodiments, referring to FIG. 4, mixing unit 11 includes a first mixer 111, a second mixer 112, a third mixer 113, a fourth mixer 114, a third 90 degree bridge 115, a fourth 90 degree bridge 116, a fifth 90 degree bridge 117, a sixth 90 degree bridge 118, a seventh 90 degree bridge 119, and a power divider 120.
The input end of the power divider 120 is the first input end of the mixing unit 11, the first output end of the power divider 120 is connected with the input end of the third 90-degree bridge 115, and the second output end of the power divider 120 is connected with the input end of the fourth 90-degree bridge 116.
The input terminal of the fifth 90 degree bridge 117 is the second input terminal of the mixing unit 11, the first output terminal of the fifth 90 degree bridge 117 is connected to the input terminal of the sixth 90 degree bridge 118, and the second output terminal of the fifth 90 degree bridge 117 is connected to the input terminal of the seventh 90 degree bridge 119.
A first input of the first mixer 111 is connected to a first output of the third 90-degree bridge 115 and a second input of the first mixer 111 is connected to a first output of the sixth 90-degree bridge 118.
The first input of the second mixer 112 is connected to the second output of the third 90-degree bridge 115 and the second input of the second mixer 112 is connected to the second output of the sixth 90-degree bridge 118.
A first input of the third mixer 113 is connected to a first output of the fourth 90-degree bridge 116 and a second input of the third mixer 113 is connected to a first output of the seventh 90-degree bridge 119.
The first input of the fourth mixer 114 is connected to the second output of the fourth 90-degree bridge 116 and the second input of the fourth mixer 114 is connected to the second output of the seventh 90-degree bridge 119.
The output end of the first mixer 111 is a first output end of the mixing unit 11, the output end of the second mixer 112 is a second output end of the mixing unit 11, the output end of the third mixer 113 is a third output end of the mixing unit 11, and the output end of the fourth mixer 114 is a fourth output end of the mixing unit 11.
In the embodiment of the invention, four mixers are adopted to generate four paths of orthogonal signals (Sig 1, sig2, sig3 and Sig 4), and a differential network is constructed through the four mixers, so that the dynamic range of the mixers is improved.
In the embodiment of the present invention, each of the 90-degree bridge and the 180-degree bridge includes two input ends and two output ends, and it should be clear to those skilled in the art that the fourth terminals not mentioned in the above embodiment are all isolation ends, which are not described herein again.
In some embodiments, the first mixer 111, the second mixer 112, the third mixer 113, and the fourth mixer 114 are single-ended mixers.
The single-ended mixer can work under smaller local oscillation power due to the bias network arranged on the mixer tube, so that the power consumption of the mixer is greatly reduced.
The phase of the local oscillation signal is as followsThe phase of the radio frequency signal isAn example is described.
Referring to FIG. 4, the phase of the signal at the first output of the third 90 degree bridge 115 isThe phase of the signal at the second output of the third 90 degree bridge 115 isThe phase of the signal at the first output of the fourth 90 degree bridge 116 isThe phase of the signal at the second output of the fourth 90 degree bridge 116 is
The phase of the signal at the first output of the fifth 90 degree bridge 117 isThe phase of the signal at the second output of the fifth 90 degree bridge 117 is
The phase of the signal at the first output of the sixth 90 degree bridge 118 isThe phase of the signal at the second output of the sixth 90 degree bridge 118 isThe phase of the signal at the first output of the seventh 90 degree bridge 119 isThe phase of the signal at the second output of the seventh 90 degree bridge 119 is
The phase of the signal (Sig 1) at the output of the first mixer 111 isThe phase of the signal (Sig 2) at the output of the second mixer 112 isThe phase of the signal (Sig 3) at the output of the third mixer 113 isThe phase of the signal (Sig 4) at the output of the fourth mixer 114 is
In some embodiments, the phase of the signal at the output of the first 90 degree bridge 12 isThe phase of the signal at the output of the second 90 degree bridge 13 is
The signal at the output of the first 90-degree bridge 12 and the signal at the output of the second 90-degree bridge 13 output the target signal by 180-degree bridge combination.
In some embodiments, the mixer further comprises a first DC bias unit, a second DC bias unit, a third DC bias unit, and a fourth DC bias unit.
The first end of the first dc offset unit is connected to the first output of the mixer unit 11, the first end of the fourth dc offset unit is connected to the fourth output of the mixer unit 11, and the second end of the first dc offset unit and the second end of the fourth dc offset unit are connected to the first input of the first 90-degree bridge 12 and the second input of the first 90-degree bridge 12, respectively.
The first end of the second dc offset unit is connected to the second output end of the mixer unit 11, the first end of the third dc offset unit is connected to the third output end of the mixer unit 11, and the second end of the second dc offset unit and the second end of the third dc offset unit are connected to the first input end of the second 90-degree bridge 13 and the second input end of the second 90-degree bridge 13, respectively.
In the embodiment of the invention, the two input ends of the first 90-degree bridge 12 and the two input ends of the first 90-degree bridge 12 are respectively provided with the direct current bias unit, and the differential characteristic of the mixer network can be greatly corrected by adjusting the voltage value of the direct current bias unit, so that the isolation degree of the mixer port is further optimized. Meanwhile, a direct current bias unit is arranged in the differential network, so that better signal cancellation effect is achieved, and isolation of the ports of the mixer is further improved.
In some embodiments, the first dc bias unit, the second dc bias unit, the third dc bias unit, and the fourth dc bias unit have the same circuit structure.
In order to ensure the consistency of the differential network, the circuit structures of the bias units are the same, and parameters of elements in the bias units can be set differently according to actual application requirements.
In some embodiments, referring to FIG. 5, the first DC bias unit includes a first capacitor C1, a second capacitor C2, an inductor L1 and a resistor R1.
The first end of the first capacitor C1 is a first end of the first dc bias unit, and the second end of the first capacitor C1 is a second end of the first dc bias unit.
The inductor L1 and the resistor R1 are connected in series between the first terminal of the first capacitor C1 and the dc power supply terminal VCC.
The first end of the second capacitor C2 is connected to the dc power supply terminal VCC, and the second end of the second capacitor C2 is grounded.
In the embodiment of the present invention, the first capacitor C1 is connected in series in the loop for blocking, and the potential of each output end of the mixer unit 11 can be finely tuned with the bias voltage. The second capacitor C2 is used for filtering, and can prevent the radio frequency signal from being crosstalked into the mixing unit 11 through the control line, and interference is generated. The inductor L1 is a choke inductor L1, and is connected in series with the resistor R1 to prevent crosstalk of signals at the output end of the mixer unit 11 to the dc power supply end VCC, and interferes with other channels through the dc power supply end VCC. Component parameters of each direct current bias unit are reasonably designed, and the consistency of the components is ensured while the performance is ensured.
According to the mixer provided by the embodiment of the invention, the mixing units with relatively high frequency are integrated by adopting one-chip chips, the first 90-degree electric bridge 12, the second 90-degree electric bridge 13 and the 180-degree electric bridge with relatively low frequency are formed by adopting discrete chip bonding, and each direct-current bias unit is built by adopting surface-mounted devices, so that the consistency of the mixer is ensured.
Corresponding to any of the above mixers, the embodiment of the present invention further provides a communication device, which includes any of the above mixers, and has the advantages of the above mixers, which are not described herein.
The foregoing embodiments are merely for illustrating the technical solution of the present application, but not for limiting the same, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solution described in the foregoing embodiments may be modified or substituted for some of the technical features thereof, and that these modifications or substitutions should not depart from the spirit and scope of the technical solution of the embodiments of the present application and should be included in the protection scope of the present application.
Claims (9)
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| CN104821792A (en) * | 2015-04-27 | 2015-08-05 | 西安空间无线电技术研究所 | Mixer and method capable of outputting local oscillation harmonic amplitude through cancellation and suppression |
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| US7231197B1 (en) * | 2000-10-27 | 2007-06-12 | Fisher Daniel E | Angle rate interferometer and passive ranger |
| CN102270965B (en) * | 2011-04-02 | 2013-08-28 | 华为技术有限公司 | Mixer circuit and local oscillation leakage suppression method for mixer circuit |
| CN113055046B (en) * | 2021-03-09 | 2022-07-12 | 杭州永谐科技有限公司东莞分公司 | Multichannel broadband millimeter wave mixing system |
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