S-band low-stray radio frequency orthogonal up-conversion circuit

Abstract

The utility model provides an S wave band low spurious radio frequency quadrature up-conversion circuit, which is characterized in that I-path / Q-path signals are subjected to amplitude adjustment after entering and then enter a bridge to generate IN-path and IP-path (QN and QP) signals to enter corresponding interfaces of a modulator, the signals are output after being modulated, the output end of the modulator is connected with a filter, the filter suppresses local oscillation signals, and the output end of the modulator is connected with a power supply. The superposition modulator suppresses a local oscillation signal, the suppression of the local oscillation signal is more than 70dB, the modulation signal passes through the filter, is subjected to amplitude adjustment, enters the second-stage mixer, is subjected to frequency mixing, is filtered and amplified and is finally output, at the moment, the frequency reaches an S wave band (4GHz-6GHz), and the output amplitude reaches + 10dBm.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communication, in particular to an S-band low-spurious radio frequency orthogonal up-conversion circuit. Background Art

[0002] S-band low spurious RF orthogonal up-conversion circuit, this technology can be applied to the field of wireless communications, and can also be applied to certain test and measurement equipment, and the design of this index performance is the core component of some test and measurement equipment, and its performance parameters directly affect the application scope and performance indicators of the entire test and measurement equipment. The existing modulator has low output spurious suppression and narrow output frequency bandwidth, making it difficult to expand the output frequency range. Utility Model Content

[0003] The utility model provides an S-band low-spurious radio frequency orthogonal up-conversion circuit to solve the problems of low output spurious suppression and narrow output frequency bandwidth of the existing modulator.

[0004] In order to solve the above problems, the utility model provides an S-band low-spurious radio frequency orthogonal up-conversion circuit, including a bridge, a modulator, a filter 1, an amplifier 1, a mixer, a filter 2, an equalizer, and an amplifier 2:

[0005] Bridge: used to condition I / Q signals into IN and IP / QN and QP signals;

[0006] Modulator: connected to the bridge, used to condition the four signals IN, IP, QN and QP and the local oscillator signal to the S band, and suppress the local oscillator signal by more than 35dB;

[0007] Filter 1: connected to the modulator, used to suppress the local oscillator signal with a suppression degree of more than 35dB;

[0008] Amplifier 1: connected to the filter 1, to perform amplitude conditioning on the filtered S-band signal;

[0009] Mixer: connected to the amplifier 1, used to mix the fixed S-band signal with the local oscillator signal and condition it into a broadband signal covering 4GHz to 6GHz;

[0010] Filter 2: connected to the mixer, used to suppress S-band and local oscillator signals with a suppression degree of more than 70dB;

[0011] Equalizer: connected to the second filter, to adjust the amplitude flatness of the broadband signal;

[0012] Amplifier 2: connected to the equalizer, to adjust the amplitude of the broadband signal to an output amplitude of +10dBm.

[0013] As a preferred technical solution of the utility model, the frequency of the I-channel / Q-channel signal is DC-350MHz, and the center frequency of the first-level S-band signal of the I-channel / Q-channel is 3150MHz after being modulated by the modulator.

[0014] As a preferred technical solution of the utility model, the first-stage S-band signal is conditioned into a broadband S-band signal after passing through a mixer, and the frequency coverage range is 4 GHz to 6 GHz.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] In the S-band low-spurious RF orthogonal up-conversion circuit of the utility model, the input I-channel / Q-channel signal and the synchronously input local oscillator signal are conditioned by a modulator to generate a first-level S-band signal, and this S-band signal is a fixed center frequency signal. The first-level S-band signal and the synchronously input second local oscillator signal are conditioned by a mixer to generate a second-level S-band signal, and this S-band signal is a broadband signal. The frequency distribution in this design is reasonable, various intermodulation spurs are avoided, and finally low-spurious performance is achieved, and the output frequency range can be expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or some technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of an S-band low spurious RF orthogonal up-conversion circuit provided in an embodiment of the utility model.

[0019] Reference numerals:

[0020] 1. Bridge; 2. Modulator; 3. Filter 1; 4. Amplifier 1; 5. Mixer; 6. Filter 2; 7. Equalizer; 8. Amplifier 2. DETAILED DESCRIPTION

[0021] In the following, only some exemplary embodiments are briefly described. As engineers working in this industry can recognize, within the framework of the utility model examples, the described embodiments can be modified appropriately. Therefore, the drawings and descriptions are considered to be illustrative and non-restrictive in nature.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple people" is two or more, unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] like Figure 1As shown, the embodiment of the utility model provides an S-band low-spurious radio frequency orthogonal up-conversion circuit, including a bridge 1, a modulator 2, a filter 3, an amplifier 4, a mixer 5, a filter 6, an equalizer 7, and an amplifier 8:

[0028] Bridge 1: used to condition the I / Q signals into IN and IP / QN and QP signals;

[0029] Modulator 2: connected to bridge 1, used to condition the four signals IN, IP, QN and QP and the local oscillator signal to the S band, and suppress the local oscillator signal above 35dB;

[0030] Filter 1 3: connected to modulator 2, used to suppress the local oscillator signal with a suppression degree of more than 35dB;

[0031] Amplifier 1 4: connected to filter 1 3, to perform amplitude conditioning on the filtered S-band signal;

[0032] Mixer 5: connected to amplifier 4, used to mix the fixed S-band signal with the local oscillator signal and condition it into a broadband signal covering 4 GHz to 6 GHz;

[0033] Filter 2 6: connected to mixer 5, used to suppress S-band and local oscillator signals, with a suppression degree of more than 70 dB;

[0034] Equalizer 7: connected to filter 2 6, to adjust the amplitude flatness of the broadband signal;

[0035] Amplifier 2 8: connected to the equalizer 7, to adjust the amplitude of the broadband signal so that the amplitude reaches the output amplitude of +10dBm;

[0036] In summary, in the S-band low-spurious RF orthogonal up-conversion circuit provided by the utility model, the I-channel / Q-channel signal and the synchronously input local oscillator signal are conditioned by the modulator 2 to generate a first-stage S-band single-frequency signal. After the signal passes through the filter 3, a low-spurious S-band signal with spurious suppression of more than 70 dB can be generated. This S-band signal and the synchronously input local oscillator signal are conditioned by the mixer 5 and then by the filter 6 to generate a broadband S-band low-spurious signal with a frequency coverage of 4GHz to 6GHz. After being conditioned by the equalizer 7 and the amplifier 8, a low-spurious S-band signal can be generated, thereby realizing the function of the S-band low-spurious RF orthogonal up-conversion circuit.

Claims

1. An S-band low spurious radio frequency orthogonal up-conversion circuit, comprising a bridge (1), a modulator (2), a filter 1 (3), an amplifier 1 (4), a mixer (5), a filter 2 (6), an equalizer (7), and an amplifier 2 (8), characterized in that: Bridge (1): used to condition the I / Q signal into IN and IP / QN and QP signals; Modulator (2): connected to the bridge (1), used for conditioning the four signals IN, IP, QN and QP and the local oscillator signal to the S band; Filter 1 (3): connected to the modulator (2), and used to suppress the local oscillator signal; Amplifier 1 (4): connected to the filter 1 (3), and performs amplitude conditioning on the filtered S-band signal; A mixer (5) connected to the amplifier (4) for mixing the fixed S-band signal with the local oscillator signal to adjust the signal into a broadband signal covering 4 GHz to 6 GHz; Filter 2 (6): connected to the mixer (5), used to filter out the S-band and local oscillator signals to obtain a pure broadband signal; An equalizer (7) is connected to the filter 2 (6) to adjust the amplitude flatness of the broadband signal; Amplifier 2 (8): connected to the equalizer (7), adjusts the amplitude of the broadband signal to an output amplitude of +10dBm.

2. The S-band low spurious RF orthogonal up-conversion circuit according to claim 1, characterized in that: The frequency of the I / Q signal is between DC and 350 MHz, and the center frequency of the first-order S-band signal of the I / Q signal is 3150 MHz after being modulated by the modulator (2).

3. The S-band low spurious RF orthogonal up-conversion circuit according to claim 2, characterized in that: The first-stage S-band signal is conditioned into a broadband S-band signal after passing through a mixer (5), and the frequency coverage range is 4 GHz to 6 GHz.

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