CN108521270B - Mixer and receiver - Google Patents
Mixer and receiver Download PDFInfo
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- CN108521270B CN108521270B CN201810121612.4A CN201810121612A CN108521270B CN 108521270 B CN108521270 B CN 108521270B CN 201810121612 A CN201810121612 A CN 201810121612A CN 108521270 B CN108521270 B CN 108521270B
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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
- H03D7/14—Balanced arrangements
- H03D7/1408—Balanced arrangements with diodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Abstract
The invention discloses a mixer and a receiver, wherein the mixer comprises: the frequency mixing circuit is used for receiving a radio frequency input signal and a local oscillation signal and mixing frequency according to the received radio frequency input signal and the received local oscillation signal; and the high-pass filter circuit is connected with the frequency mixing circuit to filter out the frequency doubling signal and the intermodulation signal of the radio frequency input signal and the frequency doubling signal of the local oscillation signal, so that the frequency doubling signal and the intermodulation signal of the radio frequency input signal and the frequency doubling signal of the local oscillation signal are prevented from participating in frequency mixing again. The invention can prevent the frequency doubling signal and the intermodulation signal of the radio frequency input signal from participating in frequency mixing again, improve the IIP3 of the frequency mixer, and further improve the anti-intermodulation interference index; and frequency multiplication signals of the local oscillation signals are filtered, and the out-of-band spurious signal interference resistance is improved.
Description
Technical Field
The invention relates to the technical field of mixers, in particular to a mixer and a receiver.
Background
At present, because a receiving link mixer IIP3(Input third-order inter-modulation point ) is Low, a receiver reduces a gain of a front-end LNA (Low noise amplifier) to ensure that an anti-intermodulation interference index meets a requirement. And the gain of the LNA is reduced, resulting in a reduction in the receive sensitivity of the receiver.
In order to improve the above problem, the prior art receiver selects an integrated module to meet the requirement of IIP3, and the cost is increased from 5 yuan per chip to 30 yuan per chip, which greatly increases the cost.
Disclosure of Invention
In order to solve the above problems, the present invention provides a mixer and a receiver, which can meet the requirement of the intermodulation interference resistance index and reduce the cost.
To solve the above technical problem, the present invention further provides a mixer, including: the frequency mixing circuit is used for receiving a radio frequency input signal and a local oscillation signal and mixing frequency according to the received radio frequency input signal and the received local oscillation signal; and the high-pass filter circuit is connected with the frequency mixing circuit to filter out the frequency doubling signal and the intermodulation signal of the radio frequency input signal and the frequency doubling signal of the local oscillation signal, so that the frequency doubling signal and the intermodulation signal of the radio frequency input signal and the frequency doubling signal of the local oscillation signal are prevented from participating in frequency mixing again.
In order to solve the above technical problem, the present invention further provides a receiver, which includes the above mixer.
Compared with the prior art, the mixer of the invention comprises: the frequency mixing circuit is used for receiving a radio frequency input signal and a local oscillation signal and mixing frequency according to the received radio frequency input signal and the received local oscillation signal; the high-pass filter circuit is connected with the frequency mixing circuit to filter out a frequency doubling signal and an intermodulation signal of the radio frequency input signal and a frequency doubling signal of the local oscillation signal, so that the frequency doubling signal and the intermodulation signal of the radio frequency input signal and the frequency doubling signal of the local oscillation signal are prevented from participating in frequency mixing again; a high-pass filter circuit is used for filtering out frequency doubling signals and intermodulation signals of radio frequency input signals, the frequency doubling signals and the intermodulation signals of the radio frequency input signals are prevented from participating in frequency mixing again, the IIP3 of the frequency mixer is improved, and then the intermodulation interference resistance index is improved; and a high-pass filter circuit is used for filtering frequency doubling signals of local oscillation signals, so that the out-of-band spurious signal interference resistance is improved, and the cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a mixer according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram of the mixer of FIG. 1;
fig. 3 is a schematic structural diagram of a receiver according to a first embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be noted that the following examples are only illustrative of the present invention, and do not limit the scope of the present invention. Similarly, the following examples are only some but not all examples of the present invention, and all other examples obtained by those skilled in the art without any inventive work are within the scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a mixer according to a first embodiment of the invention. The mixer 10 comprises a mixer circuit 11 and a high-pass filter circuit 12, wherein the mixer circuit 11 is configured to receive a radio frequency input signal RF and a local oscillation signal LO and perform mixing according to the received radio frequency input signal RF and the local oscillation signal LO. The high-pass filter circuit 12 is connected to the mixer circuit 11 and is configured to filter out a frequency multiplication signal and an intermodulation signal of the RF input signal RF and a frequency multiplication signal of the local oscillation signal LO, so as to prevent the frequency multiplication signal and the intermodulation signal of the RF input signal RF and the frequency multiplication signal of the local oscillation signal LO from participating in frequency mixing again.
As shown in fig. 2, the mixer 10 further includes a first balun circuit T1, a second balun circuit T2, a first capacitor C1, a second capacitor C2, and a third capacitor C3.
The first balun T1 includes a radio frequency input terminal 131, a first terminal 132, a second terminal 133, a third terminal 134, a fourth terminal 135, and a mixed signal output terminal 136. The first end 132 is suspended; the second end 133 is grounded; the radio frequency input 131 is for receiving a radio frequency input signal RF; the mixed signal output terminal 136 is used for outputting the output signal IF mixed by the mixer 10. The first balun circuit T1 is connected to the mixer circuit 11 through the third terminal 134 and the fourth terminal 135, and receives a radio frequency input signal RF input to the mixer circuit 11 and a signal mixed by the mixer circuit 11.
Wherein, the second balun circuit T2 includes: a local oscillation signal input terminal 141, a fifth terminal 142, a sixth terminal 143, a seventh terminal 144, an eighth terminal 145, and a ninth terminal 146. The local oscillation signal input terminal 141 is configured to receive a local oscillation signal LO; the sixth and ninth terminals 143, 146 are grounded; the eighth end 145 is floating. The fifth terminal 142 and the seventh terminal 144 of the second balun circuit T2 are connected to the mixer circuit 11, so as to input the local oscillation signal LO to the mixer circuit 11.
Here, the first balun circuit T1 and the second balun circuit T2 may be transformers. The second balun T2 is connected to the local oscillation signal source 15 through a filter circuit formed by capacitors, so as to receive the local oscillation signal LO. Specifically, one end of the first capacitor C1 is connected to the local oscillation signal source 15, and the other end of the first capacitor C1 is connected to the local oscillation signal input terminal 141; one end of the second capacitor C2 is connected to the local oscillation signal source 15, and the other end of the second capacitor C2 is grounded; one end of the third capacitor C3 is connected to the local oscillation signal input terminal 141, and the other end of the third capacitor C3 is grounded.
The mixer circuit 11 may be a balanced diode mixer circuit, and includes a first diode set 161, a second diode set 162, a third diode set 163, and a fourth diode set 164 connected end to end; wherein, a connection point between the first diode set 161 and the second diode set 162 serves as the first end 111 of the mixer circuit 11 to connect the third end 134 of the first balun circuit T1; the connection point between the second diode group 162 and the third diode group 163 serves as the second terminal 112 of the mixer circuit 11 to connect the seventh terminal 144 of the second balun circuit T2; the connection point between the third diode group 163 and the fourth diode group 164 serves as the third terminal 113 of the mixer circuit 11 to which the fourth terminal 135 of the first balance/unbalance circuit T1 is connected; the connection point between the fourth diode group 164 and the first diode group 161 serves as the fourth terminal 114 of the mixer circuit 11 to connect the fifth terminal 142 of the second balun circuit T2.
In the present embodiment, the first diode group 161, the second diode group 162, the third diode group 163, and the fourth diode group 164 respectively include at least one diode, and the first diode group 161, the second diode group 162, the third diode group 163, and the fourth diode group 164 respectively include one diode as an example for explanation.
The high-pass filter circuit 12 includes: a first high pass filter 121, a second high pass filter 122, a first resistor R1, and a second resistor R2. The first high pass filter 121 is connected to a node between the third terminal 134 of the first balun T1 and the first terminal 111 of the mixer circuit 11, and is used for preventing the frequency multiplication signal and the intermodulation signal of the rf input signal output from the first terminal 111 of the mixer circuit 11 and the frequency multiplication signal of the local oscillation signal LO from entering the mixer circuit 11 again. The second high pass filter 122 is connected to a node between the fourth terminal 135 of the first balun T1 and the third terminal 113 of the mixer circuit 11, for preventing the double frequency signal and the intermodulation signal of the rf input signal and the double frequency signal of the local oscillation signal LO output from the third terminal 113 of the mixer circuit 11 from entering the mixer circuit 11 again.
The first high-pass filter 121 is grounded through a first resistor R1, and the first high-pass filter 121 attenuates and absorbs the frequency doubling signal and the intermodulation signal of the radio frequency input signal and the frequency doubling signal of the local oscillation signal LO filtered by the first high-pass filter 121 through a first resistor R1; the second high pass filter 122 is grounded through a second resistor R2, and the second high pass filter 122 attenuates and absorbs the frequency multiplication signal and the intermodulation signal of the rf input signal and the frequency multiplication signal of the local oscillation signal LO filtered by the second high pass filter 122 by using a second resistor R2.
The following description will take the example that the RF input signal RF includes the first RF input signal f1 and the second RF input signal f 2. After the first rf input signal f1 and the second rf input signal f2 enter the mixer circuit 11 for mixing, the frequency-doubled signal of the rf input signal and the quadrature signal output by the mixer circuit 11 and the frequency-doubled signal of the local oscillation signal LO may be second-order nonlinear components, for example, the frequency-doubled signal of the rf input signal is 2f1 or 2f2, the quadrature signal is 2f1-f2 or 2f2-f1, and the frequency-doubled signal of the local oscillation signal LO is 2 LO. When the frequency-doubled signal of the rf input signal enters the mixer circuit 11 again for mixing, the frequency-doubled signal of the rf input signal output by the mixer circuit 11 may be a third-order nonlinear component, for example, the frequency-doubled signal of the rf input signal is 3f1 or 3f 2.
The working principle of the mixer 10 is described in detail below:
the radio frequency input terminal 131 receives a radio frequency input signal RF which enters the mixer circuit 11 through the third terminal 134 or the fourth terminal 135 of the first balun circuit T1. The local oscillation signal input terminal 141 receives the local oscillation signal LO from the local oscillation signal source 15, and the local oscillation signal LO enters the mixer circuit 11 through the fifth terminal 142 or the seventh terminal 144 of the second balun circuit T2.
The mixer circuit 11 mixes the RF input signal RF with the local oscillator signal LO and may obtain a half IF interference point of 2(RF-0.5IF) or an AB23 interference point of 2 LO. The first high pass filter 121 or the second high pass filter 122 is used to absorb the 2RF or 2LO attenuation onto the first resistor R1 or the second resistor R2. That is, the mixer 10 utilizes the high-pass filter circuit 12 to filter out the frequency multiplication signal of the RF input signal or the frequency multiplication signal (2RF or 2LO) of the local oscillation signal LO, so as to prevent the frequency multiplication signal and the intermodulation signal of the RF input signal and the frequency multiplication signal of the local oscillation signal LO from participating in the mixing again.
Therefore, the mixer 10 filters the frequency doubling signal and the intermodulation signal of the radio frequency input signal by using the high-pass filter circuit 12, prevents the frequency doubling signal and the intermodulation signal of the radio frequency input signal from participating in mixing again, improves the IIP3 of the mixer 10, and further improves the anti-intermodulation interference index; and the high-pass filter circuit 12 is used for filtering out frequency doubling signals of local oscillation signals, so that the out-of-band spurious signal interference resistance is improved, and the cost is reduced.
As shown in fig. 3, the receiver 30 includes a local oscillation signal source 31 and a mixer 32, the mixer 32 obtains a local oscillation signal LO from the local oscillation signal source 31, and the mixer 32 is the mixer 10 disclosed in the foregoing embodiment and is not described herein again.
In summary, the mixer 10 of the present invention includes a mixer circuit 11 and a high-pass filter circuit 12, where the high-pass filter circuit 12 is connected to the mixer circuit 11 and is configured to filter out the frequency multiplication signal and the intermodulation signal of the radio frequency input signal, so as to avoid the frequency multiplication signal and the intermodulation signal of the radio frequency input signal from participating in frequency mixing again, improve IIP3 of the mixer 10, and further improve the intermodulation interference resistance index; and the high-pass filter circuit 12 is used for filtering out frequency doubling signals of local oscillation signals, so that the out-of-band spurious signal interference resistance is improved, and the cost is reduced.
It should be noted that the above embodiments belong to the same inventive concept, and the description of each embodiment has a different emphasis, and reference may be made to the description in other embodiments where the description in individual embodiments is not detailed.
The protection circuit and the control system provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained in the present document by applying a specific example, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (5)
1. A mixer, comprising:
the frequency mixing circuit is used for receiving a radio frequency input signal and a local oscillation signal and mixing frequency according to the received radio frequency input signal and the received local oscillation signal;
the high-pass filter circuit is connected with the frequency mixing circuit to filter out a frequency doubling signal and an intermodulation signal of the radio frequency input signal and a frequency doubling signal of the local oscillation signal, so that the frequency doubling signal and the intermodulation signal of the radio frequency input signal and the frequency doubling signal of the local oscillation signal are prevented from participating in frequency mixing again;
a first balun circuit comprising:
a radio frequency input for receiving the radio frequency input signal;
a first end, a second end, a third end and a fourth end; and
a mixed signal output end for outputting an output signal mixed by the mixer;
wherein the second terminal is grounded, and the first balun circuit is connected to the mixer circuit via the third terminal and the fourth terminal, so as to input the rf input signal to the mixer circuit and receive a signal mixed from the mixer circuit;
a second balun circuit comprising:
a local oscillation signal input terminal for receiving the local oscillation signal;
a fifth end, a sixth end, a seventh end, an eighth end and a ninth end;
wherein the sixth terminal and the ninth terminal are grounded, and the fifth terminal and the seventh terminal in the second balun circuit are connected to the mixer circuit to input the local oscillation signal to the mixer circuit;
the mixing circuit is a double-balanced diode mixing circuit, and comprises a first diode group, a second diode group, a third diode group and a fourth diode group which are connected end to end;
the connection point between the first diode group and the second diode group is used as a first end of the mixing circuit to be connected with a third end of the first balanced/unbalanced circuit;
a connection point between the second diode group and the third diode group serves as a second end of the mixer circuit to connect a seventh end of the second balun circuit;
a connection point between the third diode group and the fourth diode group serves as a third end of the mixer circuit to connect with a fourth end of the first balun circuit;
a connection point between the fourth diode group and the first diode group serves as a fourth end of the mixer circuit to connect with a fifth end of the second balun circuit;
the first diode group, the second diode group, the third diode group and the fourth diode group respectively comprise at least one diode;
the high-pass filter circuit includes:
a first high pass filter connected to a node between the third terminal of the first balun circuit and the first terminal of the mixer circuit to prevent a multiplied frequency signal of the rf input signal and an intermodulation signal output at the first terminal of the mixer circuit and a multiplied frequency signal of the local oscillation signal from reentering the mixer circuit;
and a second high pass filter connected to a node between the fourth terminal of the first balun circuit and the third terminal of the mixer circuit, so as to prevent a multiplied frequency signal of the rf input signal and the intermodulation signal, which are output from the third terminal of the mixer circuit, and a multiplied frequency signal of the local oscillation signal from reentering the mixer circuit.
2. The mixer according to claim 1, wherein the first balun circuit and the second balun circuit are each implemented using a transformer.
3. The mixer of claim 1, wherein the second balun circuit is coupled to a local oscillator signal source through a filter circuit comprising a capacitor to receive the local oscillator signal.
4. The mixer of claim 1, wherein the first high pass filter is further grounded through a first resistor to absorb a multiplied frequency signal of the radio frequency input signal and an intermodulation signal filtered by the first high pass filter and a multiplied frequency signal of the local oscillation signal with the first resistor attenuation; the second high-pass filter is further grounded through a second resistor, so that the second resistor is used for attenuating and absorbing the frequency multiplication signal and the intermodulation signal of the radio frequency input signal and the frequency multiplication signal of the local oscillation signal, which are filtered by the second high-pass filter.
5. Receiver, characterized in that it comprises a mixer according to claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810121612.4A CN108521270B (en) | 2018-02-05 | 2018-02-05 | Mixer and receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810121612.4A CN108521270B (en) | 2018-02-05 | 2018-02-05 | Mixer and receiver |
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| Publication Number | Publication Date |
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| CN108521270A CN108521270A (en) | 2018-09-11 |
| CN108521270B true CN108521270B (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810121612.4A Active CN108521270B (en) | 2018-02-05 | 2018-02-05 | Mixer and receiver |
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| NZ508054A (en) * | 2000-11-09 | 2002-11-26 | Tait Electronics Ltd | Double balanced diode mixer for generating an IF output signal from an RF input signal |
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| WO2011162809A1 (en) * | 2010-06-22 | 2011-12-29 | Hittite Microwave Corporation | Improved double balanced mixer |
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| US5428840A (en) * | 1993-12-10 | 1995-06-27 | Itt Corporation | Monolithic double balanced microstrip mixer with flat conversion loss |
| CN201113924Y (en) * | 2007-08-06 | 2008-09-10 | 成都宏明电子股份有限公司 | Diode double balanced mixer possessing direct current bias |
| CN102918772A (en) * | 2010-03-15 | 2013-02-06 | 赫梯特微波公司 | Distributed, diode mixer circuit |
| CN105991092A (en) * | 2015-01-29 | 2016-10-05 | 西安电子科技大学 | Mixer simulation method and mixer simulation device |
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