CN111698184B - Broadband equalization circuit with adjustable amplitude-frequency characteristic - Google Patents
Broadband equalization circuit with adjustable amplitude-frequency characteristic Download PDFInfo
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- CN111698184B CN111698184B CN202010496917.0A CN202010496917A CN111698184B CN 111698184 B CN111698184 B CN 111698184B CN 202010496917 A CN202010496917 A CN 202010496917A CN 111698184 B CN111698184 B CN 111698184B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a broadband equalization circuit with adjustable amplitude-frequency characteristics, which belongs to the technical field of equalizers and solves the technical problem of inaccurate power control of a power amplifier during emission due to uneven coupling signals, and comprises a port 1, a port 2 and a bridge T four-order broadband equalization network connected between the port 1 and the port 2; the port 1 and the port 2 are in reciprocal relation; the port 1 and the port 2 are used for connecting the bridge T fourth-order broadband equalization network between the radio frequency circuit and the rear-stage circuit, and the bridge T fourth-order broadband equalization network acts on the coupling signal to realize in-band gain equalization and flatten the in-band gain of the coupling signal; the port 2 is used for outputting the coupled signal with flat gain to a post-stage circuit; wherein the in-band gain equalization is based on a gain curve of the coupled signal to perform inverse curvature compensation of the signal gain. The invention realizes the accurate control of the amplitude-frequency characteristic in the working frequency band and improves the detection precision and the reliability of the single power amplifier.
Description
Technical Field
The invention relates to the technical field of equalizers, in particular to a broadband equalizing circuit with adjustable amplitude-frequency characteristics.
Background
With the continuous development of communication technology, the operating frequency bandwidth is wider and wider, the in-band gain of the radio frequency circuit is often fluctuated greatly, and at the moment, a broadband equalization circuit is needed, and the combined design of the equalization circuit can be realized aiming at different frequency bands by considering the characteristic that the amplitudes of all frequency bands in a full frequency band are inconsistent. The amplitude of some rf sensing or sampling circuits is related to the frequency and exhibits a certain rule, and at this time, a wideband equalization circuit is also needed for matching, such as rf detection and control of a communication transmitter. A new generation of broadband communication systems requires more precise and stable control of power emission, which requires that the equalization circuit must satisfy characteristics of broadband operation, high coupling flatness, and the like. If the coupling band of the equalizing circuit is uneven, the detection voltages of different frequency points have larger difference due to larger in-band ripples, and the power values output by the power amplifier have larger difference at different frequency points in the working frequency band, so that the reliability of a single power amplifier is influenced.
If some frequency points are coupled 'wave troughs', at the moment, the coupled signal is smaller than a normal value, the power amplifier detection and control unit wrongly judges that the output power is smaller at the moment, the power can be continuously increased to output a higher power level and kept, so that the reliability of the power amplifier single machine is reduced, and the output power can exceed the power capacity of the power amplifier external equipment when serious, so that the external equipment is damaged, and the reliability of the system is influenced. And the power output is increased to exceed the rated power designed by a power amplifier single machine, the power tube works at the maximum saturated output power for a long time, the service life of the power tube is shortened, and the power tube is easy to burn in the field.
If some frequency points are coupled wave crests, the coupled signals are larger than normal values, and the power amplifier detection and control unit mistakenly determines that the output power is larger at this time, the power output is continuously reduced to a lower power level and maintained, so that the output power of a single power amplifier is lower than the actually required value, and the system requirement cannot be met.
Therefore, the in-band ripple of the broadband equalizing circuit affects not only the operational reliability of the system, but also the design and cost of external devices (such as filters, rf switches, etc.). The existing coupling circuit and broadband equalization circuit cannot ensure the characteristics of low insertion loss, high stability and high in-band flatness under the condition of limited volume.
Further, the coupling degree of the broadband signal varies depending on the coupling method, and for example, the coupling of the strip line or the coaxial line is performed at a frequency (f) away from the center of the coupling line 0 ) In the lower sideband coupling (this coupling mode, hereinafter referred to as short coupling), the operating frequency f is generally required to be less than or equal to f 0 10, its coupling is 6dB up per octave; strip line or coaxial line coupling using a frequency (f) not far from the center of the coupled line 0 ) Lower sideband coupling of, generally requiring f 0 /2≥f≥f 0 10, where the coupling rises by less than 6dB per octave. The existing broadband equalizing circuit can not adjust the amplitude-frequency characteristic according to the specific coupling degree so as to adapt to different broadband signal coupling modes.
Disclosure of Invention
In view of the above analysis, the present invention provides a wideband equalization circuit with adjustable amplitude-frequency characteristics, which makes the coupled signal equalized by the equalization circuit have constant coupling degree in the whole frequency band and high flatness in the frequency band, and is adaptable to different wideband signal coupling modes.
The invention discloses a broadband equalization circuit with adjustable amplitude-frequency characteristics, which comprises a port 1, a port 2 and a bridge T four-order broadband equalization network connected between the port 1 and the port 2;
the port 1 and the port 2 are used for connecting a bridge T fourth-order broadband equalization network between a previous-stage radio frequency circuit and a next-stage circuit, the port 1 is used for connecting the previous-stage radio frequency circuit and connecting a radio frequency coupling signal, and the bridge T fourth-order broadband equalization network is used for carrying out in-band gain equalization on the coupling signal so as to flatten the in-band gain of the coupling signal; the port 2 is used for outputting the coupled signal with flat gain to a post-stage circuit;
wherein the in-band gain equalization is based on a gain curve of the coupled signal to perform inverse curvature compensation of the signal gain.
Further, the bridge T fourth-order broadband equalization network comprises a second-order series resonance branch, a second-order parallel resonance branch, an impedance network branch, and resistors R3 and R4; the resistors R3 and R4 are adjustable resistors;
the impedance network branch is connected between the port 1 and the port 2 and comprises resistors R1 and R2 which are connected in series;
the second-order series resonance branch circuit is connected between the port 1 and the port 2 and comprises a first inductor L1 and a first capacitor C1 which are connected in series; the resistor R3 is connected in series in the second-order series resonance branch circuit;
the second-order parallel resonance branch comprises a second inductor L2 and a second capacitor C2 which are connected in parallel; one end of the second-order parallel resonance branch is grounded, and the other end of the second-order parallel resonance branch is connected to the connecting end of the resistors R1 and R2 through the resistor R4.
Further, the R1 and the R2 are pure resistors with the same resistance, and the resistance of the R1 and the resistance of the R2 are equal to the port impedance values R of the port 1 and the port 2.
Further, the resonant frequency ω of the second-order series resonant branch 01 The resonant frequency ω of the second-order parallel resonant branch 02 Satisfy omega 01 ≈ω 02 ＜ω L ，ω L The low end of the frequency of the coupled signal.
Further, the impedance Z of the series circuit formed by the first inductor L1, the first capacitor C1 and the resistor R3 connected in series 1 Impedance Z of series-parallel circuit composed of second inductor L2, second capacitor C2 and resistor R4 2 Satisfies the condition Z 1 Z 2 ＝R 2 。
Further, the first capacitance value C 1 A second inductance L 2 And the port impedance value R satisfies:
further, the resistance values R of the resistors R3 and R4 3 ＝R 4 The attenuation amplitude per octave of the broadband equalization circuit Δ a ≈ -20lg [ (2 ≈ R/(R + R)) 3 ))]。
Furthermore, the resistance values of the resistors R3 and R4 are synchronously adjusted, so that the gain attenuation amplitude of each octave of the broadband equalization circuit is equal to the gain rise amplitude of each octave of the coupling signal gain curve.
Further, the coupling mode of the port signal is short coupling or lower sideband coupling.
Further, when the port impedance value R =50 Ω; the resistance value of the adjusting resistors R3 and R4 is adjusted within the range of 0 omega to R 3 ＝R 4 ＜50Ω。
The invention has the following beneficial effects:
1. the invention solves the technical problem of inaccurate power control of the power amplifier during transmitting due to uneven coupling signals, and improves the detection precision and the reliability of a single power amplifier.
2. The two ports of the invention have the same characteristic impedance and are pure resistors, the adopted circuit form is absorption type, the transmission loss is absorbed on the R1 and R2 resistors, the ports have no reflection, the standing wave is small, and the standing wave optimization is carried out without adding an attenuator on the ports.
3. The attenuation value in the working frequency band is increased along with the frequency and is in a linear relation, the attenuation value can be adjusted by adjusting the resistance values of R3 and R4, and the method can be used for amplitude-frequency equalization when a strip line or a coaxial line is subjected to short coupling, amplitude-frequency equalization when a lower sideband is coupled, and other occasions needing amplitude-frequency equalization.
4. The circuit structure of the invention is relatively simple, the circuit devices are few, and the cost is low.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of a wideband equalization circuit in an embodiment of the present invention;
FIG. 2 shows the impedance Z of the bridge T network in an embodiment of the invention c An equivalent circuit schematic diagram;
FIG. 3 shows the short-circuit impedance Z of the bridge T network in an embodiment of the invention 0 An equivalent circuit schematic diagram;
FIG. 4 shows the open-circuit impedance Z of the bridge T network in an embodiment of the invention ∞ Schematic diagram of equivalent circuit.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
The embodiment discloses a broadband equalization circuit with adjustable amplitude-frequency characteristics, as shown in fig. 1, which includes a port 1, a port 2, and a bridge T fourth-order broadband equalization network connected between the port 1 and the port 2; and the port 1 and the port 2 are used for connecting the bridge T four-order broadband equalization network between the upper-stage radio frequency circuit and the rear-stage circuit.
The port 1 is used for connecting a primary radio frequency circuit and accessing a radio frequency coupling signal; the radio frequency coupling signal is a broadband signal, the in-band gain fluctuation of the radio frequency coupling signal is large, and broadband equalization processing is needed.
The bridge T fourth-order broadband equalization network is used for carrying out in-band gain equalization on the coupled signals so as to flatten the in-band gain of the coupled signals;
the in-band gain equalization is directed at a gain curve of the coupled signal to perform inverse curvature compensation of the signal gain to achieve flatness of the signal gain.
The port 2 is used for outputting the gain-flattened coupled signal to a subsequent stage circuit for further detection and processing.
Specifically, the bridge T fourth-order broadband equalization network comprises a second-order series resonance branch, a second-order parallel resonance branch, an impedance network branch, and resistors R3 and R4; and the resistors R3 and R4 are adjustable resistors and are used for adjusting amplitude-frequency characteristics.
The impedance network branch is connected between the port 1 and the port 2 and comprises resistors R1 and R2 which are connected in series.
The second-order series resonance branch comprises a first inductor L1 and a first capacitor C1 which are connected in series and connected between a port 1 and a port 2. The resistor R3 is connected in series in the second-order series resonance branch. The resistor R3 and the first inductor L1 can be interchanged, and the first capacitor C1 and the first inductor L1 can be interchanged.
The second-order parallel resonance branch comprises a second inductor L2 and a second capacitor C2 which are connected in parallel. One end of the second-order parallel resonance branch is grounded, and the other end of the second-order parallel resonance branch is connected to the connecting end of the resistors R1 and R2 through the resistor R4.
In the design of the bridge T fourth-order broadband equalization network, in order to ensure port impedance matching, R1 and R2 which are connected in series are pure resistors, the resistance values are the same, and the numerical values are equal to the required port impedance value R. The resistors R1 and R2 absorb transmission loss, no reflection exists at the port 1 and the port 2, standing waves are small, and standing wave optimization is carried out without adding an attenuator at the port.
The characteristic that the impedance of an LC series resonance loop is monotonously increased in a mode | Z | when the LC series resonance loop deviates from a resonance frequency point is utilized, so that a higher frequency end has larger attenuation quantity relative to a lower frequency end, a second-order series resonance branch is connected with an impedance network branch in parallel, the amplitude-frequency characteristic of a combined network of the two branches is correspondingly increased along with the increase of the attenuation quantity of the frequency, and the increase of the coupling degree of a coupling signal along with the increase of the frequency is offset.
However, the characteristic impedance of the combined network of the two branches is non-pure impedance in the operating frequency band, which is not consistent with the port pure impedance actually required, and the attenuation generated along with the frequency is also non-linear, so that a lossless network opposite to the LC series impedance characteristic needs to be added to perform capacitive or inductive conjugate matching, and the attenuation is corrected.
The slope relation of the module value and the frequency of the second-order parallel resonance branch circuit is that the module | Z | of impedance is monotonously reduced when the slope relation deviates from a resonance frequency point, in order to ensure that the characteristic impedances of two ports of the broadband equalizing circuit are both required port impedance values R, the second-order parallel resonance branch circuit is connected between the connection part of the series resistance networks R1 and R2 and the ground, a structural form of bilateral symmetry is achieved, the characteristic impedances at two ends of the networks are consistent, the imaginary part conjugate complementation of the series-parallel resonance networks is carried out through an equivalent circuit, the port impedance characteristic of pure resistance is achieved, and meanwhile, the curve of attenuation quantity increasing along with the frequency is corrected into a linear relation.
Because a bilateral symmetry structural form is adopted, the characteristic impedances of the two ports are both impedance values R, and the port 1 and the port 2 are in a reciprocal relation, namely the connection relations between the port 1 and the port 2 and a radio frequency circuit and a rear-stage circuit can be interchanged, the equalization effect is not influenced, and the use is more convenient and reliable.
Furthermore, in order to adapt to different coupling gain curves brought by different coupling modes, the amplitude-frequency characteristic of the balanced network is changed by adjusting the resistance values of the resistors R3 and R4, the gain attenuation curve of the balanced network is adjusted, and the adjustment of the full-band coupling degrees of different coupling modes is realized.
Specifically, the circuit parameters are designed as follows:
1) Calculating short circuit impedance Z of bridge T mixed network 0
FIG. 3 is a diagram illustrating short-circuit impedance Z of the four-step broadband equalization network of this embodiment T 0 An equivalent diagram;
as can be seen from the figure, short-circuit impedance:
in the formula, Z 1 The impedance of a series circuit formed by a first inductor L1, a first capacitor C1 and an adjusting resistor R3 which are connected in series;
ω 01 the resonant frequency of the second-order series resonant branch circuit;
Z 2 the impedance of the series-parallel circuit formed by the second inductor L2, the second capacitor C2 and the adjusting resistor R4
ω 02 The resonant frequency of the second-order series resonant branch circuit;
ω =2 π f, f being the operating frequency, R being the desired port impedance value, R 3 Is the resistance value of the resistor R3, R 4 Is the resistance value of the resistor R4.
2) Calculating open circuit impedance Z of bridge T mixed network ∞
FIG. 4 shows the open-circuit impedance Z of the four-step broadband equalization network of this embodiment T ∞ An equivalent diagram;
as can be seen, the open circuit impedance:
3) Calculating port impedance Z of bridge T mixed network c
FIG. 2 is a diagram showing the port impedance Z of the bridge T fourth-order broadband equalization network of this embodiment c An equivalent circuit diagram of (a);
impedance of ports in the figure
4) Calculating a first capacitance value C that satisfies the port impedance requirement and the resonant frequency requirement 1 A first inductance value L 1 A second inductance L 2 And a second capacitance value C 2 ；
a. Calculating a first capacitance value C 1 And a second inductance value L 2
When the port impedance is pure impedance R, R 2 ＝Z 1 Z 2 When the resonant frequency ω of the second-order series resonant branch 01 Two isResonance frequency omega of order parallel resonance branch 02 Satisfy omega 01 ≈ω 02 ＝ω 0 ＜ω L When the temperature of the water is higher than the set temperature,
ω L the working frequency of the circuit is the low end value;
i.e. when the first capacitance value C 1 A second inductance L 2 And the required port impedance value R satisfies
When the impedance of the port is pure impedance R;
b. calculating a second capacitance value C 2 And a first inductance value L 1 ；
In determining the first capacitance value C 1 A second inductance L 2 After the relationship of (1), according to
A second inductance value L can be determined 2 And a second capacitance value C 2 The relationship of (1); according to>
A first inductance value L can be determined 1 And a first capacitance value C 1 The relationship (2) of (c).
5) Calculating the transmission loss delta A of the four-order bridge T hybrid network of each frequency multiplication:
the transmission loss of the four-step bridge T hybrid network is
When R is satisfied 2 ＝Z 1 Z 2 ，R 3 ＝R 4 And ω is 01 ≈ω 02 ＝ω 0 ＜ω L Time of flight
Two frequency points within the operating frequency bandf 1 And f 2 And then:
ΔA＝A (f2) -A (f1) ≈-20lg[(f 2 /f 1 )*(R/(R+R 3 ))]；
when f is 2 ＝2f 1 The attenuation amplitude per octave Δ a ≈ -20lg [ (2 ≈ (R/(R + R) ] 3 ))]More than or equal to-6 dB; the attenuation amplitude of each octave can be conveniently adjusted by adjusting the resistance value of the resistor R3.
Selecting a first capacitance value C 1 A first inductance value L 1 A second inductance value L 2 A second capacitance value C 2 And a resistance R 3 、R 4 Is such that the resonance frequency omega of the series resonant circuit and the parallel resonant circuit 01 、ω 02 Satisfy omega 01 ≈ω 02 ＝ω 0 ＜ω L Satisfy R 2 ＝Z 1 Z 2 The attenuation amplitude delta A curve of each octave transmission of the bridge T mixed network in a working frequency band is opposite to the in-band coupling gain curve of the coupling signal, so that the inverse curvature compensation can be carried out on the curve, the in-band gain of the radio frequency signal is flattened, and the coupling degree of the output signal in a full frequency band is constant.
When the signals connected to the ports are coupled by a strip line or a coaxial line, the coupled signals may be coupled by a short coupling or a lower sideband, or may be coupled by other coupling methods.
When short coupling is used, the coupling degree rises by 6dB per octave; can be adjusted by adjusting R 3 ＝R 4 =0, Δ a ≈ 20lg [ (2 · (R/(R + R)) 3 ))]= 20lg2= -6dB; and carrying out balanced cancellation on the short coupling signal to ensure that the coupling degree of the output signal is constant in the full frequency band.
When the lower sideband coupling is adopted, the coupling degree is increased by less than 6dB per octave; can be adjusted by adjusting R 3 、R 4 The resistance value of the transformer ensures that the attenuation amplitude delta A of each octave is the same as the coupling degree rising amplitude when the lower sideband is coupled, and the lower sideband coupling signal is balanced and offset, so that the coupling degree of the output signal in the full frequency band is constant.
When other coupling modes are adopted, the rising amplitude of each octave is increased according to the coupling degree;can be adjusted by adjusting R 3 、R 4 The resistance value of the transformer enables the attenuation amplitude delta A of each octave to be the same as the coupling degree rising amplitude when the lower sideband is coupled, the coupled signals are balanced and offset, and the coupling degree of the output signals in the full frequency band is constant.
In other words, in the working frequency band, the equalization circuit attenuates the corresponding values of the frequency signals at different working frequency points, and the difference of the coupling values of the coupling signals at different working frequency points is exactly offset, so that the coupling degree of the radio frequency coupling signals is controlled at a certain preset value in the full frequency band, and the coupling degree of the signals is irrelevant to the frequency, and the purpose of equalizing the full frequency band of the radio frequency coupling signals is achieved.
Specifically, when the strip line or the coaxial line is coupled, the required port impedance value R =50 Ω; in this case the resistance R 3 、R 4 The resistance value adjusting range is 0 omega to R 3 ＝R 4 ＜50Ω。
In conclusion, the technical problem that power control of the power amplifier is inaccurate when the power amplifier transmits due to the fact that the coupling signal is uneven is solved, and detection precision and reliability of a single power amplifier are improved.
The characteristic impedance of two ports of the equalizing circuit is the same and is pure resistance, the adopted circuit form is absorption type, the transmission loss is absorbed on the R1 and R2 resistances, the ports do not reflect, the standing wave is small, and the standing wave optimization is carried out without adding an attenuator on the ports. When a single RC balanced circuit is adopted, the problems that the port impedance is not pure resistance, the insertion loss of a coupled signal is large, the coupling degree is extremely low, and a direct current signal output after detection is small and large in fluctuation and is not suitable for being used in occasions with high precision requirements are avoided; the function is completed by adjusting the amplitude and frequency through a multi-stage LC, RC and RLC filter circuit, the function belongs to a reflection type, port standing waves are poor, an attenuator needs to be additionally arranged to optimize the port standing waves, and the functions are multiple in devices, complex in circuit and difficult to debug.
The attenuation value in the working frequency band is increased along with the frequency and is in a linear relation, the attenuation value can be adjusted by adjusting the resistance values of R3 and R4, and the method can be used for amplitude-frequency equalization when a strip line or a coaxial line is subjected to short coupling, amplitude-frequency equalization when a lower sideband is coupled, and other occasions needing amplitude-frequency equalization.
And the resistance values of the resistors R3 and R4 are adjusted, so that the transmission coefficient of the balance network can be conveniently and finely adjusted, and the influence of parasitic parameters of devices in the circuit can be counteracted.
The circuit is simple in structure, convenient to debug, and low in cost, and has port reciprocity characteristics, the characteristics of the two ports are consistent, impedance is pure resistance, and the circuit is convenient to test and use, and circuit devices are few.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (6)
1. A broadband equalization circuit with adjustable amplitude-frequency characteristics is characterized by comprising a port 1, a port 2 and a bridge T four-order broadband equalization network connected between the port 1 and the port 2;
the port 1 and the port 2 are used for connecting a bridge T fourth-order broadband equalization network between a previous-stage radio frequency circuit and a next-stage circuit, the port 1 is used for connecting the previous-stage radio frequency circuit and accessing a radio frequency coupling signal, and the bridge T fourth-order broadband equalization network is used for carrying out in-band gain equalization on the coupling signal so as to flatten the in-band gain of the coupling signal; the port 2 is used for outputting the coupled signal with flat gain to a post-stage circuit;
wherein, the in-band gain equalization is based on a gain curve of a coupled signal to perform inverse curvature compensation of signal gain;
the bridge T fourth-order broadband equalization network comprises a second-order series resonance branch, a second-order parallel resonance branch, an impedance network branch and resistors R3 and R4; the resistors R3 and R4 are adjustable resistors; the amplitude-frequency characteristic of the equalization network is changed by adjusting the resistance values of the resistors R3 and R4, the gain attenuation curve of the equalization network is adjusted, and the adjustment of the full-band coupling degrees of different coupling forms is realized;
the impedance network branch is connected between the port 1 and the port 2 and comprises resistors R1 and R2 which are connected in series;
the second-order series resonance branch circuit is connected between the port 1 and the port 2 and comprises a first inductor L1 and a first capacitor C1 which are connected in series; the resistor R3 is connected in series in the second-order series resonance branch circuit;
the second-order parallel resonance branch comprises a second inductor L2 and a second capacitor C2 which are connected in parallel; one end of the second-order parallel resonance branch is grounded, and the other end of the second-order parallel resonance branch is connected to the connecting end of the resistors R1 and R2 through a resistor R4;
the R1 and the R2 are pure resistors with the same resistance value, and the resistance values of the R1 and the R2 are equal to the port impedance values R of the port 1 and the port 2;
resistance value R of the resistors R3 and R4 3 ＝R 4 The attenuation amplitude per octave of the broadband equalization circuit Δ a ≈ -20lg [ (2 ≈ R/(R + R)) 3 ))]；
And the resistance values of the resistors R3 and R4 are synchronously adjusted, so that the gain attenuation amplitude of each octave of the broadband equalizing circuit is equal to the gain rise amplitude of each octave of a coupling signal gain curve.
2. The wideband equalization circuit of claim 1 wherein the second order series resonant branch has a resonant frequency ω 01 Resonant frequency ω of said second order parallel resonant branch 02 Satisfy omega 01 ≈ω 02 ＜ω L ，ω L The low end of the frequency of the coupled signal.
3. Broadband equalizing circuit according to claim 2, characterized in that the impedance Z of the series circuit of the first inductor L1, the first capacitor C1 and the resistor R3 connected in series is such that it forms a series circuit 1 Impedance Z of series-parallel circuit composed of second inductor L2, second capacitor C2 and resistor R4 2 Satisfies the condition Z 1 Z 2 ＝R 2 。
4. The wideband equalization circuit of claim 3 wherein said first capacitance value C 1 A second inductance L 2 And the port impedance value R satisfies:
5. the wideband equalization circuit of claim 1, wherein the port signals are coupled in a short coupling or a lower sideband coupling.
6. The wideband equalization circuit of claim 1, wherein when the port impedance value R =50 Ω; the resistance value of the adjusting resistors R3 and R4 is adjusted within the range of 0 omega to R 3 ＝R 4 ＜50Ω。
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| CN115084816B (en) * | 2022-07-21 | 2024-03-01 | Oppo广东移动通信有限公司 | Radio frequency circuit, passive circuit and electronic equipment |
| CN117335766B (en) * | 2023-12-01 | 2024-03-26 | 成都世源频控技术股份有限公司 | Ultra-wideband radio frequency equalizer structure |
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