Mixer and communication device
By introducing a 180-degree bridge and mixing module into the mixer, a differential network is built, which solves the problem of poor isolation of the single-ended mixer port and significantly improves the isolation of the mixer.
Patent Information
- Application Number
- CN202111145685.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-09-28
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2041-09-28
AI Technical Summary
The port isolation of existing single-ended mixers is poor and cannot meet the actual application needs.
A mixer is designed, including a mixing module and a 180-degree bridge. The mixing module mixes the local oscillator signal and the radio frequency signal, and combines the output through a 180-degree bridge to build a differential network to improve the isolation of the port.
By building a differential network, the isolation of the mixer port is significantly improved and the needs of practical applications are met.
Smart Images
Figure CN114039552B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of mixers, and in particular relates to a mixer and a communication device. Background Art
[0002] Microwave millimeter wave backhaul has the advantages of low cost and robustness, and has been widely used in the field of communications. As the key to frequency change, the mixer plays an important role in the microwave millimeter wave backhaul network.
[0003] The single-ended mixer is the most basic mixer architecture. It has a simple structure, low power consumption, and low cost, but its port isolation is poor and cannot meet actual application requirements. Summary of the invention
[0004] In view of this, embodiments of the present invention provide a mixer and a communication device to solve the problem of poor port isolation of a single-ended mixer in the prior art.
[0005] A first aspect of an embodiment of the present invention provides a mixer, comprising: a mixing module and a 180-degree bridge;
[0006] The first input end of the mixing module is used to input a local oscillator signal, the second input end of the mixing module is used to input a radio frequency signal, the first output end of the mixing module is connected to the first input end of the 180-degree bridge, the second output end of the mixing 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;
[0007] The mixing module is used to mix the local oscillator signal and the radio frequency signal, and output two mixed signals with the same amplitude and a phase difference of 180 degrees from the first output end of the mixing module and the second output end of the mixing module respectively.
[0008] Optionally, the frequency mixing module includes: a frequency mixing unit, a first 90-degree bridge and a second 90-degree bridge;
[0009] The first input end of the frequency mixing unit is the first input end of the frequency mixing module, the second input end of the frequency mixing unit is the 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 to 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 to the first input end of the second 90-degree bridge and the second input end of the second 90-degree bridge;
[0010] The output end of the first 90-degree bridge is the first output end of the mixing module, and the output end of the second 90-degree bridge is the second output end of the mixing module;
[0011] The mixing unit is used to mix the local oscillator signal and the radio frequency signal, and outputs four mixed signals with the same amplitude and phases different by 90 degrees from four output ends of the mixing unit respectively.
[0012] Optionally, the mixing unit includes: a first mixer, a second mixer, a third mixer, a fourth mixer, a third 90-degree bridge, a fourth 90-degree bridge, a fifth 90-degree bridge, a sixth 90-degree bridge, a seventh 90-degree bridge and a power divider;
[0013] The input end of the power divider is the first input end of the frequency mixing unit, the first output end of the power divider is connected to the input end of the third 90-degree bridge, and the second output end of the power divider is connected to the input end of the fourth 90-degree bridge;
[0014] The input end of the fifth 90-degree bridge is the second input end of the frequency mixing unit, the first output end of the fifth 90-degree bridge is connected to the input end of the sixth 90-degree bridge, and the second output end of the fifth 90-degree bridge is connected to the input end of the seventh 90-degree bridge;
[0015] The first input terminal of the first mixer is connected to the first output terminal of the third 90-degree bridge, and the second input terminal of the first mixer is connected to the first output terminal of the sixth 90-degree bridge;
[0016] The first input end of the second mixer is connected to the second output end of the third 90-degree bridge, and the second input end of the second mixer is connected to the second output end of the sixth 90-degree bridge;
[0017] The first input terminal of the third mixer is connected to the first output terminal of the fourth 90-degree bridge, and the second input terminal of the third mixer is connected to the first output terminal of the seventh 90-degree bridge;
[0018] The first input end of the fourth mixer is connected to the second output end of the fourth 90-degree bridge, and the second input end of the fourth mixer is connected to the second output end of the seventh 90-degree bridge;
[0019] The output end of the first mixer is the first output end of the mixing unit, the output end of the second mixer is the second output end of the mixing unit, the output end of the third mixer is the third output end of the mixing unit, and the output end of the fourth mixer is the fourth output end of the mixing unit.
[0020] Optionally, the first mixer, the second mixer, the third mixer, and the fourth mixer are all single-ended mixers.
[0021] Optionally, the phase of the local oscillator signal is The phase of the RF signal is
[0022] The phase of the signal at the first output end of the third 90-degree bridge is The phase of the signal at the second output end of the third 90-degree bridge is The phase of the signal at the first output end of the fourth 90-degree bridge is The phase of the signal at the second output end of the fourth 90-degree bridge is
[0023] The phase of the signal at the first output end of the fifth 90-degree bridge is The phase of the signal at the second output end of the fifth 90-degree bridge is
[0024] The phase of the signal at the first output end of the sixth 90-degree bridge is The phase of the signal at the second output end of the sixth 90-degree bridge is The phase of the signal at the first output end of the seventh 90-degree bridge is The phase of the signal at the second output end of the seventh 90-degree bridge is
[0025] The phase of the signal at the output of the first mixer is The phase of the signal at the output of the second mixer is The phase of the signal at the output of the third mixer is The phase of the signal at the output of the fourth mixer is
[0026] Optionally, the phase of the signal at the output end of the first 90-degree bridge is The phase of the signal at the output of the second 90-degree bridge is
[0027] Optionally, the mixer further includes: a first DC bias unit, a second DC bias unit, a third DC bias unit and a fourth DC bias unit;
[0028] A first end of the first DC bias unit is connected to a first output end of the frequency mixing unit, a first end of the fourth DC bias unit is connected to a fourth output end of the frequency mixing unit, and a second end of the first DC bias unit and a second end of the fourth DC bias unit are connected to a first input end of the first 90-degree bridge and a second input end of the first 90-degree bridge, respectively;
[0029] The first end of the second DC bias unit is connected to the second output end of the mixing unit, the first end of the third DC bias unit is connected to the third output end of the mixing unit, and the second end of the second DC bias unit and the second end of the third DC bias unit are respectively connected to the first input end of the second 90-degree bridge and the second input end of the second 90-degree bridge.
[0030] 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 all the same.
[0031] Optionally, the first DC bias unit includes: a first capacitor, a second capacitor, an inductor and a resistor;
[0032] The first end of the first capacitor is the first end of the first DC bias unit, and the second end of the first capacitor is the second end of the first DC bias unit;
[0033] The inductor and the resistor are connected in series between the first end of the first capacitor and the DC power supply end;
[0034] A first end of the second capacitor is connected to the DC power supply end, and a second end of the second capacitor is grounded.
[0035] A second aspect of the embodiments of the present invention provides a communication device, including the mixer provided by the first aspect of the embodiments of the present invention.
[0036] The embodiment of the present invention provides a mixer and a communication device, the mixer comprising: 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 outputs two mixed signals with the same amplitude and a phase difference of 180 degrees from the first output end of the mixer module and the second output end of the mixer module respectively. The embodiment of the present invention forms two mixed signals with the same amplitude and a phase difference of 180 degrees through the mixer module, and then outputs them through the 180-degree bridge, so as to construct a differential network and improve the isolation of the port. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0038] Figure 1 is a structural schematic diagram of a mixer provided by an embodiment of the present invention;
[0039] Figure 2 is a schematic diagram of the principle of a mixer provided by an embodiment of the present invention;
[0040] Figure 3is a structural schematic diagram of another mixer provided by an embodiment of the present invention;
[0041] Figure 4 is a structural schematic diagram of another mixer provided by an embodiment of the present invention;
[0042] Figure 5 is a circuit schematic diagram of a first DC bias unit provided in an embodiment of the present invention;
[0043] Figure 6 It 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
[0044] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.
[0045] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.
[0046] refer to Figure 1 A first aspect of an embodiment of the present invention provides a mixer, including: a mixing module 1 and a 180-degree bridge 2.
[0047] The first input end of the mixing module 1 is used to input a local oscillator signal, the second input end of the mixing module 1 is used to input a radio frequency signal, the first output end of the mixing module 1 is connected to the first input end of the 180-degree bridge 2, the second output end of the mixing module 1 is connected to the second input end of the 180-degree bridge 2, and the output end of the 180-degree bridge 2 is used to output a target signal.
[0048] The mixing module 1 is used to mix the local oscillator signal and the radio frequency signal, and output two mixed signals with the same amplitude and a phase difference of 180 degrees from the first output end of the mixing module 1 and the second output end of the mixing module 1 respectively.
[0049] The 180-degree bridge can divide an input signal into two signals with equal amplitude and 180° phase difference, or combine two signals with equal amplitude and 180° phase difference into one signal. In the embodiment of the present invention, the mixing module 1 forms two mixed signals with the same amplitude and 180° phase difference, and then combines the outputs through the 180-degree bridge 2 to construct a differential network, which decomposes the leakage signal of the local oscillator into two signals with equal amplitude and opposite phase. Figure 2, the signals are canceled after combining, which improves the isolation of the port.
[0050] In some embodiments, reference Figure 3 The mixing module 1 includes: a mixing unit 11, a first 90-degree bridge 12 and a second 90-degree bridge 13.
[0051] 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 to 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 to the first input end of the second 90-degree bridge 13 and the second input end of the second 90-degree bridge 13.
[0052] The output end of the first 90-degree bridge 12 is the first output end of the mixer module 1 , and the output end of the second 90-degree bridge 13 is the second output end of the mixer module 1 .
[0053] The frequency mixing unit 11 is used to mix the local oscillator signal and the radio frequency signal, and four output terminals of the frequency mixing unit 11 respectively output four mixed signals with the same amplitude and phases different by 90 degrees.
[0054] The 90-degree bridge can divide an input signal into two signals with equal amplitude and a 90-degree phase difference, or combine two signals with equal amplitude and a 90-degree phase difference into one signal. In the embodiment of the present invention, the mixer unit 11 forms four mixed signals with the same amplitude and phases that differ by 90 degrees. For example, the phases of the four mixed signals are θ, θ+π; two of them are combined through the first 90-degree bridge 12 to form one signal, and the other two are combined through the second 90-degree bridge 13 to form a second signal, and the two signals have the same amplitude and a phase difference of 180 degrees. For example, the phase is The two signals of and θ are combined to form a signal with a phase of θ. The two signals of θ+π are combined to form the first signal with a phase of θ+π; or the phase of The two signals of and θ are combined to form a phase The signal has a phase of θ+π and The two signals are combined to form the first phase. The embodiment of the present invention uses two 90-degree bridges to realize an orthogonal network with different phase combinations, thereby improving the image frequency suppression of the mixer, further constructing a network with good differential characteristics, and improving the impedance of the mixer port, thereby improving the isolation of the mixer port. At the same time, four-way orthogonal signals (the above four-way mixing signals with the same amplitude and phase difference of 90 degrees) are used to improve the dynamic range of the mixer.
[0055] In some embodiments, reference Figure 4 The 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.
[0056] 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 to the input end of the third 90-degree bridge 115 , and the second output end of the power divider 120 is connected to the input end of the fourth 90-degree bridge 116 .
[0057] The input end of the fifth 90-degree bridge 117 is the second input end of the mixing unit 11 , the first output end of the fifth 90-degree bridge 117 is connected to the input end of the sixth 90-degree bridge 118 , and the second output end of the fifth 90-degree bridge 117 is connected to the input end of the seventh 90-degree bridge 119 .
[0058] A first input terminal of the first mixer 111 is connected to a first output terminal of the third 90-degree bridge 115 , and a second input terminal of the first mixer 111 is connected to a first output terminal of the sixth 90-degree bridge 118 .
[0059] A first input terminal of the second mixer 112 is connected to a second output terminal of the third 90-degree bridge 115 , and a second input terminal of the second mixer 112 is connected to a second output terminal of the sixth 90-degree bridge 118 .
[0060] A first input terminal of the third mixer 113 is connected to a first output terminal of the fourth 90-degree bridge 116 , and a second input terminal of the third mixer 113 is connected to a first output terminal of the seventh 90-degree bridge 119 .
[0061] A first input terminal of the fourth mixer 114 is connected to a second output terminal of the fourth 90-degree bridge 116 , and a second input terminal of the fourth mixer 114 is connected to a second output terminal of the seventh 90-degree bridge 119 .
[0062] The output end of the first mixer 111 is the first output end of the mixing unit 11 , the output end of the second mixer 112 is the second output end of the mixing unit 11 , the output end of the third mixer 113 is the third output end of the mixing unit 11 , and the output end of the fourth mixer 114 is the fourth output end of the mixing unit 11 .
[0063] In the embodiment of the present invention, four mixers are used to generate four orthogonal signals (Sig1, Sig2, Sig3, Sig4), and a differential network is constructed by the four mixers, thereby improving the dynamic range of the mixers.
[0064] Each 90-degree bridge and 180-degree bridge in the embodiments of the present invention includes two input terminals and two output terminals. Those skilled in the art should be aware that the fourth terminal not mentioned in the above embodiments is an isolation terminal and will not be described in detail here.
[0065] In some embodiments, the first mixer 111 , the second mixer 112 , the third mixer 113 , and the fourth mixer 114 are all single-ended mixers.
[0066] Since a bias network is provided in the mixing tube of a single-ended mixer, it can work at a relatively small local oscillator power, thus greatly reducing the power consumption of the mixer.
[0067] The following uses the phase of the local oscillator signal as The phase of the RF signal is Take this as an example to illustrate.
[0068] refer to Figure 4 , the phase of the signal at the first output end of the third 90-degree bridge 115 is The phase of the signal at the second output end of the third 90-degree bridge 115 is The phase of the signal at the first output terminal of the fourth 90-degree bridge 116 is The phase of the signal at the second output end of the fourth 90-degree bridge 116 is
[0069] The phase of the signal at the first output terminal of the fifth 90-degree bridge 117 is The phase of the signal at the second output end of the fifth 90-degree bridge 117 is
[0070] The phase of the signal at the first output terminal of the sixth 90-degree bridge 118 is The phase of the signal at the second output terminal of the sixth 90-degree bridge 118 is The phase of the signal at the first output terminal of the seventh 90-degree bridge 119 is The phase of the signal at the second output end of the seventh 90-degree bridge 119 is
[0071] The phase of the signal (Sig1) at the output of the first mixer 111 is The phase of the signal (Sig2) at the output of the second mixer 112 is The phase of the signal (Sig3) at the output of the third mixer 113 is The phase of the signal (Sig4) at the output of the fourth mixer 114 is
[0072] In some embodiments, the phase of the signal at the output end of the first 90-degree bridge 12 is The phase of the signal at the output end of the second 90-degree bridge 13 is
[0073] The signal at the output end of the first 90-degree bridge 12 and the signal at the output end of the second 90-degree bridge 13 are combined through a 180-degree bridge to output a target signal.
[0074] In some embodiments, the mixer further includes: a first DC bias unit, a second DC bias unit, a third DC bias unit and a fourth DC bias unit.
[0075] The first end of the first DC bias unit is connected to the first output end of the mixing unit 11, the first end of the fourth DC bias unit is connected to the fourth output end of the mixing unit 11, and the second end of the first DC bias unit and the second end of the fourth DC bias unit are respectively connected to the first input end of the first 90-degree bridge 12 and the second input end of the first 90-degree bridge 12.
[0076] The first end of the second DC bias unit is connected to the second output end of the mixing unit 11, the first end of the third DC bias unit is connected to the third output end of the mixing unit 11, and the second end of the second DC bias unit and the second end of the third DC bias unit are respectively 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.
[0077] In the embodiment of the present invention, a DC bias unit is provided at both input ends of the first 90-degree bridge 12 and both input ends of the first 90-degree bridge 12. By adjusting the voltage value of the DC bias unit, the differential characteristics of the mixer network can be greatly corrected, and the isolation of the mixer port is further optimized. At the same time, the DC bias unit is provided in the differential network to play a better signal cancellation role, and the isolation of the mixer port is further improved.
[0078] In some embodiments, 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 all the same.
[0079] To ensure the consistency of the differential network, the circuit structures of the bias units are the same, and the parameters of the components in the bias units can be set differently according to actual application requirements.
[0080] In some embodiments, reference Figure 5 The first DC bias unit includes: a first capacitor C1, a second capacitor C2, an inductor L1 and a resistor R1.
[0081] The first end of the first capacitor C1 is the first end of the first DC bias unit, and the second end of the first capacitor C1 is the second end of the first DC bias unit.
[0082] The inductor L1 and the resistor R1 are connected in series between the first end of the first capacitor C1 and the DC power supply terminal VCC.
[0083] A first end of the second capacitor C2 is connected to the DC power supply terminal VCC, and a second end of the second capacitor C2 is grounded.
[0084] In the embodiment of the present invention, the first capacitor C1 is connected in series in the loop for direct current isolation, and the potential of each output terminal of the mixer unit 11 can be fine-tuned with the bias voltage. The second capacitor C2 is used for filtering, and at the same time can prevent the RF signal from being crosstalked into the mixer unit 11 through the control line to generate interference. The inductor L1 is a choke inductor L1, which is connected in series with the resistor R1 to prevent the signal at the output end of the mixer unit 11 from being crosstalked to the DC power supply terminal VCC, and interfering with other channels through the DC power supply terminal VCC. The component parameters of each DC bias unit are reasonably designed to ensure the performance while ensuring the consistency of the device.
[0085] In the mixer provided in the embodiment of the present invention, the mixing unit with a relatively high frequency is integrated by a one-piece chip, and the first 90-degree bridge 12, the second 90-degree bridge 13 and the 180-degree bridge with a relatively low frequency are bonded by discrete chips, and each DC bias unit is constructed by surface-mount devices, thereby ensuring the consistency of the mixer.
[0086] Corresponding to any of the above mixers, an 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 will not be described in detail herein.
[0087] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.
Claims
1. A mixer, characterized in that: include: Mixing module and 180 degree bridge; The first input end of the mixing module is used to input a local oscillator signal, the second input end of the mixing module is used to input a radio frequency signal, the first output end of the mixing module is connected to the first input end of the 180-degree bridge, the second output end of the mixing 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 mixing module is used to mix the local oscillator signal and the radio frequency signal, and output two mixed signals with the same amplitude and a phase difference of 180 degrees from the first output end of the mixing module and the second output end of the mixing module respectively; 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 the first input end of the frequency mixing module, the second input end of the frequency mixing unit is the 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 to 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 to 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 the first output end of the mixing module, and the output end of the second 90-degree bridge is the second output end of the mixing module; The mixing unit is used to mix the local oscillator signal and the radio frequency signal, and four output terminals of the mixing unit respectively output four mixing signals with the same amplitude and phases that differ by 90 degrees.
2. The mixer according to claim 1, characterized in that The mixing unit includes: a first mixer, a second mixer, a third mixer, a fourth mixer, a third 90-degree bridge, a fourth 90-degree bridge, a fifth 90-degree bridge, a sixth 90-degree bridge, a seventh 90-degree bridge and a power divider; The input end of the power divider is the first input end of the frequency mixing unit, the first output end of the power divider is connected to the input end of the third 90-degree bridge, and the second output end of the power divider is connected to the input end of the fourth 90-degree bridge; The input end of the fifth 90-degree bridge is the second input end of the frequency mixing unit, the first output end of the fifth 90-degree bridge is connected to the input end of the sixth 90-degree bridge, and the second output end of the fifth 90-degree bridge is connected to the input end of the seventh 90-degree bridge; The first input end of the first mixer is connected to the first output end of the third 90-degree bridge, and the second input end of the first mixer is connected to the first output end of the sixth 90-degree bridge; The first input end of the second mixer is connected to the second output end of the third 90-degree bridge, and the second input end of the second mixer is connected to the second output end of the sixth 90-degree bridge; The first input end of the third mixer is connected to the first output end of the fourth 90-degree bridge, and the second input end of the third mixer is connected to the first output end of the seventh 90-degree bridge; The first input end of the fourth mixer is connected to the second output end of the fourth 90-degree bridge, and the second input end of the fourth mixer is connected to the second output end of the seventh 90-degree bridge; The output end of the first mixer is the first output end of the mixing unit, the output end of the second mixer is the second output end of the mixing unit, the output end of the third mixer is the third output end of the mixing unit, and the output end of the fourth mixer is the fourth output end of the mixing unit.
3. The mixer according to claim 2, characterized in that The first mixer, the second mixer, the third mixer, and the fourth mixer are all single-ended mixers.
4. The mixer according to claim 2 or 3, characterized in that The phase of the local oscillator signal is The phase of the RF signal is The phase of the signal at the first output end of the third 90-degree bridge is The phase of the signal at the second output end of the third 90-degree bridge is The phase of the signal at the first output end of the fourth 90-degree bridge is The 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 is The 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 is The phase of the signal at the second output end of the sixth 90-degree bridge is The phase of the signal at the first output end of the seventh 90-degree bridge is The phase of the signal at the second output end of the seventh 90-degree bridge is The phase of the signal at the output of the first mixer is The phase of the signal at the output of the second mixer is The phase of the signal at the output end of the third mixer is The phase of the signal at the output end of the fourth mixer is 5. The mixer according to claim 4, characterized in that The phase of the signal at the output end of the first 90-degree bridge is The phase of the signal at the output end of the second 90-degree bridge is 6. The mixer according to any one of claims 1 to 3, characterized in that: 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 bias unit is connected to the first output end of the frequency mixing unit, the first end of the fourth DC bias unit is connected to the fourth output end of the frequency mixing unit, and the second end of the first DC bias unit and the second end of the fourth DC bias unit are connected to the first input end of the first 90-degree bridge and the second input end of the first 90-degree bridge respectively; The first end of the second DC bias unit is connected to the second output end of the mixing unit, the first end of the third DC bias unit is connected to the third output end of the mixing unit, and the second end of the second DC bias unit and the second end of the third DC bias unit are respectively connected to the first input end of the second 90-degree bridge and the second input end of the second 90-degree bridge.
7. The mixer according to claim 6, characterized in that 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 all the same.
8. The mixer according to claim 7, characterized in that The first DC bias unit includes: a first capacitor, a second capacitor, an inductor and a resistor; The first end of the first capacitor is the first end of the first DC bias unit, and the second end of the first capacitor is the second end of the first DC bias unit; The inductor and the resistor are connected in series between the first end of the first capacitor and a DC power supply end; A first end of the second capacitor is connected to the DC power supply end, and a second end of the second capacitor is grounded.
9. A communication device, characterized in that: Comprising a mixer as claimed in any one of claims 1 to 8.
Citation Information
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Mixer and method capable of outputting local oscillation harmonic amplitude through cancellation and suppression
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