CN101119098A - Gain fluctuation regulation circuit and method - Google Patents
Gain fluctuation regulation circuit and method Download PDFInfo
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- CN101119098A CN101119098A CNA2007100940178A CN200710094017A CN101119098A CN 101119098 A CN101119098 A CN 101119098A CN A2007100940178 A CNA2007100940178 A CN A2007100940178A CN 200710094017 A CN200710094017 A CN 200710094017A CN 101119098 A CN101119098 A CN 101119098A
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Abstract
The present invention discloses a gain fluctuation adjusting circuit which consists of a first resonance circuit that is connected with the 90 Dgr phase end of a 3dB bridge and a second resonance circuit that are connected with the 0 Dgr phase end of the 3dB bridge and both are connected in series. The present invention also discloses a gain fluctuation adjusting method, the signals are divided into two groups after entering the 3dB bridge and the two groups enter the first resonance circuit and the second resonance circuit respectively. The two resonance circuit processes the signals and return theses signals back to the 3dB bridge which reunify the two groups of signals and then sent out. The present invention can adjust the variable capacitance of the two resonance circuit so as to adjust the in-band gain fluctuation of the circuit. The present invention can compensate the inclination of the gain of the amplifier within the range of the frequency domain through changing the resonance point of the resonance circuit by adjusting the variable capacitance, which improves the index of the in-band wave and ensures linearity of the power amplifier and normal work. Furthermore, the present invention is convenient to be controlled and easy to be carried out with low cost.
Description
Technical Field
The present invention relates to a circuit, and more particularly, to a gain fluctuation adjustment circuit. The invention also relates to a gain fluctuation adjusting method.
Background
Radio frequency power amplifiers have wide application in the field of wireless communications. In recent years, with the increase of signal modulation modes, in order to meet the increasing requirements for efficiency and linearity of power amplifiers, novel designs such as multi-stage power amplifiers, feed-forward technologies, unbalanced amplification and the like are developed, and among the novel power amplifier designs, a gain fluctuation technology is one of key technologies.
The gain fluctuation is the difference between the maximum level and the minimum level in the effective working frequency band of the repeater, and is used for balancing the gain fluctuation in the band. The requirement for in-band gain fluctuation usually does not exceed 3dB, if the gain fluctuation index is too poor, the output power of the in-band system will be inconsistent, which causes the deterioration of linearity and distortion of output signals, and if the gain fluctuation index is applied to a communication system, the EVM and PCDE indexes will be affected, which causes the deterioration of communication quality.
In a linear power amplifier, the frequency characteristic curve of a high-power single-tube amplifier is relatively stable within a certain frequency band range. However, when the system operates in a wide band range or after the system is cascaded through multiple amplifiers, the gain fluctuation of the high-power tube will be deteriorated to some extent. Meanwhile, due to the difference of frequency domain responses of various devices in the radio frequency circuit, the variation of gain or loss reflected in the circuit at different frequencies can bring more uncertainty to the in-band fluctuation of the system.
The system in-band gain index in practical work is easily influenced by the following aspects:
1. the gain fluctuation due to the impedance characteristics of the device itself is deteriorated.
In addition to the amplifier in the power amplifier circuit, the impedance characteristics of the device itself are one of the causes of the system gain up-slope. In a high-frequency use environment, the S parameter characteristics of the device are different under different frequencies. For example, for a small signal amplifier, there is a large difference in gain indexes from the 800MHz band to the 2GHz band, but the fluctuation in the narrow band is small. For the MOSFET tube of the high-power amplifier working in the 3G frequency band, the fluctuation of the gain is a sensitive index, and when the output power is larger, the MOSFET tube is particularly easy to be influenced and deteriorated. In addition, the differential loss of devices in the circuit may have large difference in different frequency bands.
2. Gain fluctuation deterioration caused by debugging a high-power tube.
(1) Linear debugging: in debugging a power amplifier, linearity is one of the first indicators to be considered. The linearity index characterizes the ability of the amplifier to amplify a signal without distortion, and in practical tests, ACPR and ACPR are generally used for characterization. The linearity indicator ACPR is an adjacent channel power ratio that measures the amount of interference or adjacent frequency channel power, and is generally defined as the ratio of the average power in adjacent channels (or offsets) to the average power in the channel transmitting the signal. ACLR is the adjacent channel power leakage ratio and is an important index for characterizing the system linearity.
The requirement on the ACPR of the base station on the 3G protocol is generally about-45 dBc, and the improvement on the linearity of the power amplifier by the currently and generally adopted Digital Predistortion (DPD) technology is generally 20-25 dB, so that the linearity of the power amplifier is required to be better than-25 dBc. This value is typically required to be-35 dBc in practice to allow for margins in production etc. The contents of power amplifier linear debugging are mainly to debug the output matching circuit of the final amplifier, and when the output power of the power amplifier is higher, the output matching circuit is more sensitive, so that the gain fluctuation index of the amplifier is necessarily influenced by the linear index debugging.
(2) Peak and efficiency commissioning: peak debugging is also a process of paramount importance in debugging power amplifiers. The peak power is the maximum variation of energy on circuit elements in a unit time of a power supply, and is a physical quantity with a size and a positive and negative, and is particularly referred to as peak output power. The greater the peak power, the more devices the power supply can load. The efficiency of the power amplifier is determined by the ratio of the output power of the power amplifier to the consumed energy, and represents the index of the energy conversion efficiency of the power amplifier.
The same as the debugging of linear indexes, the high peak value and the high efficiency of the power amplifier are realized by adjusting the power amplifier output matching circuit, and due to the sensitivity of the matching circuit, the debugging of the two indexes also inevitably influences the gain fluctuation indexes of the system.
The current radio frequency power amplifier for wireless communication is generally formed by cascading a plurality of amplifiers. To optimize the linear, peak power and efficiency performance of the system, the in-band ripple performance of the system is degraded. Amplifier systems also have stringent requirements for in-band ripple, particularly in systems such as feed forward amplifiers where the in-band ripple in the amplifier loop is very demanding, typically less than 0.5dB.
In order to make the in-band fluctuation performance of the amplifier meet the requirement, the current common method for adjusting the gain fluctuation of the power amplifier tube is to adjust the gain fluctuation of each stage of amplifier in the amplifier system so as to make the gain fluctuation of the system reach the index; since the linearity, peak value and efficiency of the amplifier and the gain fluctuation in the amplifier band cannot be optimized simultaneously, when the gain fluctuation performance of the amplifier is very good, the linearity, peak value and efficiency index of the amplifier are necessarily sacrificed. Considering the importance of linearity, peak value and efficiency index and their relationship contrary to the gain fluctuation index, the first three indexes are usually improved at the expense of gain fluctuation in high-power debugging.
Another method is to connect reactive devices (e.g. capacitors) in parallel in the small signal or high power part of the power amplifier system to adjust the gain fluctuation of the system, but this method can adjust the gain fluctuation in that range very limited, and its standing wave performance is very poor, which makes the stability of the system insufficient.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a gain fluctuation adjusting circuit and a gain fluctuation adjusting method, which can be used for adjusting the circuit gain fluctuation in a larger range and compensating the inclination of the amplifier gain in a frequency domain range, thereby improving the in-band fluctuation index, ensuring the linearity and normal work of the power amplifier, and being convenient to control, simple and easy to implement and low in cost.
To solve the above technical problems, the present invention provides a gain fluctuation adjustment circuit comprising
The first resonant circuit comprises a first 50 omega microstrip line connected between a 90-degree phase end of a 3dB bridge and the ground, a capacitor C1 and a resistor R1 are connected between the vicinity of one end, connected with the 3dB bridge, of the first 50 omega microstrip line and the ground in parallel, one end of a variable capacitor D1 is grounded, and a capacitor C3 is connected between the other end of the variable capacitor D1 and the middle part of the first 50 omega microstrip line;
the second resonant circuit comprises a second 50 omega microstrip line connected between the 0-degree phase end of the 3dB bridge and the ground, a capacitor C2 and a resistor R2 are connected in parallel between the vicinity of one end of the second 50 omega microstrip line connected with the 3dB bridge and the ground, one end of a variable capacitor D2 is grounded, and a capacitor C4 is connected between the other end of the variable capacitor D2 and the middle part of the second 50 omega microstrip line;
and the 3dB bridge is connected with an input signal, equally divides the input signal into two paths, one path is directly output to the second resonant circuit by the 0-degree phase end, the other path is output to the first resonant circuit by the 90-degree phase end after delaying for 90 degrees, then receives two paths of signals processed and reflected by the first resonant circuit and the second resonant circuit, synthesizes the two paths of received signals and outputs the synthesized signals by the isolation end.
The technical scheme of the gain fluctuation adjusting method is that after entering the 3dB bridge, signals are equally divided into two paths of completely symmetrical signals, the first path of signals is directly output to the second resonance circuit through the 0-degree phase end, the second path of signals is output to the first resonance circuit through the 90-degree phase end after being delayed for 90 degrees, the first path of signals are processed by the second resonance circuit and are reflected to the 0-degree phase end, the second path of signals are processed by the first resonance circuit and are reflected to the 90-degree phase end, the 3dB bridge synthesizes the two paths of reflected signals again and outputs the two paths of signals through the isolation end of the bridge, and the variable capacitor D1 of the first resonance circuit and the variable capacitor D2 of the second resonance circuit are adjusted, so that the power of output signals is controlled.
The invention changes the resonance point of the resonance circuit by adjusting the variable capacitor, adjusts the gain of the amplified signal, can adjust the fluctuation of the circuit gain in a larger range, compensates the inclination of the amplifier gain in a frequency domain range, improves the in-band fluctuation index, ensures the linearity and normal work of the power amplifier, and has convenient control, simplicity, easy operation and lower cost.
Drawings
The invention is explained in more detail below with reference to the drawings and examples:
FIG. 1 is a circuit diagram of a gain fluctuation adjustment circuit of the present invention;
FIG. 2 is a graph of resonant circuit impedance versus frequency;
FIG. 3 is a graph of S-parameter versus frequency for a resonant circuit;
FIG. 4 is a graph of varactor capacitance versus voltage;
FIG. 5 is a circuit diagram of another embodiment of a gain fluctuation adjustment circuit of the present invention;
FIGS. 6 to 8 are graphs showing the adjustment of the gain by the gain fluctuation adjustment circuit according to the present invention when the gain is raised in an ideal state;
FIGS. 9-11 are graphs of the adjustment of the gain by the gain fluctuation adjustment circuit of the present invention when the gain drops under ideal conditions;
fig. 12 to 14 are graphs showing the gain fluctuation adjusting circuit of the present invention adjusting the gain when the gain is changed in practice.
Detailed Description
The gain fluctuation adjusting circuit of the present invention, the structure of which is shown in FIG. 1, comprises
The first resonant circuit comprises a first 50 omega microstrip line connected between a 90-degree phase end of a 3dB bridge and the ground, a capacitor C1 and a resistor R1 are connected between the vicinity of one end, connected with the 3dB bridge, of the first 50 omega microstrip line and the ground in parallel, one end of a variable capacitor D1 is grounded, and a capacitor C3 is connected between the other end of the variable capacitor D1 and the middle of the first 50 omega microstrip line;
the second resonant circuit comprises a second 50 omega microstrip line connected between the 0-degree phase end of the 3dB bridge and the ground, a capacitor C2 and a resistor R2 are connected between the vicinity of one end, connected with the 3dB bridge, of the second 50 omega microstrip line and the ground in parallel, one end of a variable capacitor D2 is grounded, and a capacitor C4 is connected between the other end of the variable capacitor D2 and the middle of the second 50 omega microstrip line;
and the 3dB bridge is connected with an input signal, equally divides the input signal into two paths, one path is directly output to the second resonant circuit by the 0-degree phase end, the other path is output to the first resonant circuit by the 90-degree phase end after delaying for 90 degrees, then receives two paths of signals processed and reflected by the first resonant circuit and the second resonant circuit, synthesizes the two paths of received signals and outputs the synthesized signals by the isolation end.
The resonant circuit can adopt a parallel resonant circuit or a series resonant circuit to realize the gain fluctuation adjusting circuit, and the quality factor of the series resonant circuit is poor, so that the pass band of the resonant circuit is obviously deteriorated (the pass band is too wide), and the parallel resonant circuit is adopted in the invention.
Fig. 2 shows the impedance of the parallel resonant circuit as a function of frequency, and when the circuit is at the resonant frequency, the impedance of the circuit appears as a pure impedance and reaches a maximum value. If the signal frequency is less than the resonant frequency, the circuit exhibits Inductive (Inductive) and if the signal frequency is greater than the resonant frequency, the circuit exhibits Capacitive (Capacitive).
Fig. 3 shows the result of simulation of the S parameter of the capacitive impedance resonant circuit in the process of implementing the gain fluctuation adjustment function. The parallel resonance circuit presents the characteristics of opposite S21 curves on two sides of a resonance point, when a system working frequency band falls below the resonance point of the gain fluctuation adjusting circuit, the circuit presents inductance (Inductive), the circuit gain presents a descending trend, when the system working frequency band falls above the resonance point of the gain fluctuation adjusting circuit, the circuit presents capacitance (Capacitive) and the circuit gain presents an ascending trend. The gain variation curve can realize the gain fluctuation adjusting capacity of more than or equal to +/-2 dB within the range of 10 MHz-15 MHz by taking a resonance point as a center, and simultaneously, the resonance point can be moved within a wide frequency band range by adjusting the impedance of the resonance circuit and the circuit matching mode, so that the circuit can be used as a wide frequency band gain fluctuation adjusting circuit.
Variable capacitance D1 and D2 are voltage-controlled variable-capacitance ware, variable capacitance D1 with the one end that electric capacity C3 is connected, and variable capacitance D2 with the one end that electric capacity C4 is connected all is connected with control voltage end VCC. The voltage-controlled variable-capacitance devices D1 and D2 are variable capacitance diodes.
In order to simplify circuit debugging, a device with voltage control variable capacitive reactance and impedance is adopted as a resonant element in the gain starting regulating circuit, and the R value and the C value of the device are changed by changing the voltage value VCC on the device. There is a formula for the resonant frequency:
therefore, the resonant frequency of the gain fluctuation adjusting circuit moves back and forth along with the change of the voltage value on the variable capacitance device. Fig. 4 shows a capacitance-reactance change curve in the voltage-controlled varactor device, and it can be known from a formula that a resonance point of the resonance circuit is determined by the varactors D1 and D2, the parallel capacitors C1 and C2, and the microstrip inductances L of the first 50 Ω microstrip line and the second 50 Ω microstrip line, a depth of the resonance point is determined by the resistors R1 and R2, and when a voltage value at two ends of the varactor device changes from 0V to 12V, an internal capacitance characteristic parameter changes gradually from 9pF to 1 pF. And then adjusting the lengths of the R1 and R2, the C1 and C2, the first 50 omega microstrip line and the second 50 omega microstrip line, and knowing from a formula, fo can be changed correspondingly, and the required resonance depth can be obtained.
In order to improve the performance of the gain fluctuation adjusting circuit of the present invention, as shown in fig. 5, a signal input end of the 3dB bridge is connected to a third 50 Ω microstrip line, an isolation end of the 3dB bridge is connected to a fourth 50 Ω microstrip line, the resistor R1 is connected to the first 50 Ω microstrip line through a fifth 50 Ω microstrip line, the resistor R2 is connected to the second 50 Ω microstrip line through a sixth 50 Ω microstrip line, the capacitor C1 is connected to the first 50 Ω microstrip line through a seventh 50 Ω microstrip line, and the capacitor C2 is connected to the second 50 Ω microstrip line through an eighth 50 Ω microstrip line.
The output signal of the 3dB bridge is connected to the signal input of the power amplifier circuit.
The invention further provides a method for adjusting gain fluctuation of the circuit, as shown in fig. 1 and fig. 5, a signal is equally divided into two completely symmetrical signals after entering the 3dB bridge through RFin, the first signal is directly output to the second resonant circuit through the 0-degree phase end, the second signal is output to the first resonant circuit through the 90-degree phase end after being delayed by 90 degrees, because the first 50 Ω microstrip line and the second 50 Ω microstrip line are grounded, radio frequency signals are reflected, the first signal is processed by the second resonant circuit and reflected back to the 0-degree phase end, the second signal is processed by the first resonant circuit and reflected back to the 90-degree phase end, the 3dB bridge resynthesizes the two reflected signals and outputs the signals through the isolation end RFout of the bridge, and the variable capacitor D1 of the first resonant circuit and the variable capacitor D2 of the second resonant circuit are adjusted, so as to control the power of the output signal.
Because the voltage-controlled variable capacitor devices can be adopted for the D1 and the D2, the voltage-controlled variable capacitor devices D1 and D2 can be controlled by controlling the change of the voltage VCC at the voltage terminal.
The gain fluctuation adjusting circuit is connected to the front end of the power amplifier circuit, and the negative feedback end of the power amplifier circuit is connected to the control voltage end VCC to perform negative feedback control on gain.
Aiming at the phenomenon of gain fluctuation abnormity in the debugging of a high-power tube in a power amplifier circuit, the gain fluctuation adjusting circuit of the invention is required to make different compensations. In an ideal state, as shown in fig. 6, the Gain of the high-power tube in the operating frequency band shows an upward trend, the Gain of the low-frequency end is G1, the Gain of the high-frequency end is G2, the in-band Gain fluctuation is Delta Gain1= G1-G2, fig. 7 is a curve for fluctuation adjustment of the Gain fluctuation adjusting circuit, the control voltage VCC is adjusted so that the difference between the low end and the high end is Delta Gain2= G3-G4, and when Delta Gain1= Delta Gain2, the ideal system Gain curve synthesized by the two should be a horizontal straight line, as shown in fig. 8, compensation for the flat fluctuation of the Gain of the high-power tube is realized, and the effect of improving the fluctuation of the Gain of the system is achieved.
Conversely, when the Gain of the corresponding high-power tube in the band has a decreasing trend, the Gain fluctuation in the system band is Delta Gain1= G1-G2, as shown in fig. 9, fig. 10 is a curve obtained by performing fluctuation adjustment by the Gain fluctuation adjusting circuit, the difference between the low end and the high end of the curve is Delta Gain2= G3-G4, the control voltage VCC is adjusted to make Delta Gain1= Delta Gain2, and the fluctuation adjusting circuit provides a compensation curve with an increasing trend, so that the synthesized curve is still a horizontal straight line, thereby achieving the technical effect as shown in fig. 11.
In practical applications, the gain fluctuation curve of the high power transistor may also take some special forms, for example, as shown in fig. 12, the gain fluctuation curve of the high power transistor is a curve that rises first and then falls, as known from the characteristics of the capacitance resonance curve, the gain fluctuation adjusting circuit may still make corresponding adjustments, after changing the capacitance resistance value and properly adjusting the matching circuit, the resonance point of the circuit is changed, when the resonance frequency falls into the center position in the band, the gain fluctuation adjusting circuit may complete the gain compensation function in the special gain fluctuation state, so that the curve that the gain fluctuation adjusting circuit performs fluctuation adjustment is as shown in fig. 13, and after synthesis. The gain curve of the system output is a horizontal straight line as shown in fig. 14.
The gain fluctuation adjusting circuit and the method provided by the invention can be applied to a power amplifier system. In the existing power amplifier system, when the peak value and the efficiency are optimal, the gain fluctuation is increased by 2.5dB in band, and the gain fluctuation can be greatly reduced by adopting the radio frequency gain fluctuation adjusting circuit to compensate.
The gain fluctuation adjusting circuit is positioned in a power amplifier pre-stage small signal circuit, adjusts the numerical values of C1, C2, R1 and R2 to change the position of the resonant frequency, adjusts the numerical values of R1 and R2 to change the depth of a resonant point, simultaneously changes the characteristic of a control voltage value VCC to change a variable capacitance device, and finely adjusts the resonant characteristic of the circuit. Test results show that when C1 and C2 are 20pF, R1 and R2 are 47 omega, and the bias voltage is 2V, the radio frequency gain fluctuation adjusting circuit can provide the characteristic of 2.2dB drop in a required frequency band, as shown in table 1, meanwhile, the circuit difference loss is less than 3.7dB, and a compensated gain fluctuation curve of a power amplification system is 0.3dB rise in the band, so that the gain fluctuation index of the system in the band is greatly improved.
| Bias electrode Press and press | Gain fluctuation regulating electricity under different frequencies Insertion loss (dB) of road | Gain opener A device |
| V | 2.09GHz | 2.14GHz | 2.19GHz | dB |
| 0.00 | -1.10 | -2.40 | -4.10 | -3.00 |
| 1.00 | -1.30 | -2.43 | -3.90 | -2.60 |
| 2.00 | -1.41 | -2.34 | -3.66 | -2.25 |
| 3.00 | -1.46 | -2.31 | -3.29 | -1.83 |
| 4.00 | -1.55 | -2.29 | -3.05 | -1.50 |
| 5.00 | -1.62 | -2.27 | -2.59 | -0.97 |
| 6.00 | -1.79 | -2.01 | -2.06 | -0.27 |
| 7.00 | -1.83 | -1.89 | -1.93 | -0.10 |
| 8.00 | -1.90 | -1.88 | -1.80 | 0.10 |
| 9.00 | -1.96 | -1.85 | -1.69 | 0.27 |
| 10.00 | -2.05 | -1.82 | -1.56 | 0.49 |
| 11.00 | -2.10 | -1.80 | -1.38 | 0.72 |
| 12.00 | -2.19 | -1.78 | -1.17 | 1.02 |
TABLE 1
In summary, the invention changes the resonance point of the resonance circuit through the adjustment of the variable capacitor, adjusts the gain of the amplified signal, can adjust the fluctuation of the circuit gain in a larger range, compensates the inclination of the amplifier gain in the frequency domain range, improves the in-band fluctuation index, ensures the linearity and normal work of the power amplifier, and has convenient control, simplicity and easy implementation and lower cost.
Claims (10)
1. A gain fluctuation adjustment circuit, comprising
The first resonant circuit comprises a first 50 omega microstrip line connected between a 90-degree phase end of a 3dB bridge and the ground, a capacitor C1 and a resistor R1 are connected between the vicinity of one end, connected with the 3dB bridge, of the first 50 omega microstrip line and the ground in parallel, one end of a variable capacitor D1 is grounded, and a capacitor C3 is connected between the other end of the variable capacitor D1 and the middle part of the first 50 omega microstrip line;
the second resonant circuit comprises a second 50 omega microstrip line connected between the 0-degree phase end of the 3dB bridge and the ground, a capacitor C2 and a resistor R2 are connected between the vicinity of one end, connected with the 3dB bridge, of the second 50 omega microstrip line and the ground in parallel, one end of a variable capacitor D2 is grounded, and a capacitor C4 is connected between the other end of the variable capacitor D2 and the middle of the second 50 omega microstrip line;
and the 3dB bridge is connected with an input signal, equally divides the input signal into two paths, one path is directly output to the second resonant circuit by the 0-degree phase end, the other path is output to the first resonant circuit by the 90-degree phase end after delaying for 90 degrees, then receives two paths of signals processed and reflected by the first resonant circuit and the second resonant circuit, synthesizes the two paths of received signals and outputs the synthesized signals by the isolation end.
2. The gain fluctuation adjustment circuit according to claim 1, wherein the variable capacitors D1 and D2 are voltage-controlled variable-capacitance devices, and a control voltage terminal VCC is connected to both the end of the variable capacitor D1 connected to the capacitor C3 and the end of the variable capacitor D2 connected to the capacitor C4.
3. The gain fluctuation adjustment circuit of claim 2, wherein the varicap devices D1 and D2 are varactors.
4. The gain fluctuation adjustment circuit according to claim 1, wherein a third 50 Ω microstrip line is connected to the signal input terminal of the 3dB bridge, and a fourth 50 Ω microstrip line is connected to the isolation terminal of the 3dB bridge.
5. The gain fluctuation adjustment circuit of claim 1, wherein the resistor R1 is connected to the first 50 Ω microstrip line through a fifth 50 Ω microstrip line; the resistor R2 is connected with the second 50 omega microstrip line through a sixth 50 omega microstrip line.
6. The gain fluctuation adjustment circuit according to claim 1, wherein the capacitor C1 is connected to the first 50 Ω microstrip line through a seventh 50 Ω microstrip line; the capacitor C2 is connected with the second 50 Ω microstrip line through an eighth 50 Ω microstrip line.
7. A gain fluctuation adjustment circuit as claimed in claim 1, characterized in that the output signal of the 3dB bridge is connected to a signal input of a power amplifier circuit.
8. A gain fluctuation adjusting method is characterized in that a signal is evenly divided into two completely symmetrical signals after entering a 3dB bridge, the first signal is directly output to a second resonant circuit through a 0-degree phase end, the second signal is output to a first resonant circuit through a 90-degree phase end after being delayed by 90 degrees, the first signal is processed by the second resonant circuit and is reflected back to the 0-degree phase end, the second signal is processed by the first resonant circuit and is reflected back to the 90-degree phase end, the 3dB bridge synthesizes the two reflected signals again and outputs the two signals through an isolation end of the bridge, and a variable capacitor D1 of the first resonant circuit and a variable capacitor D2 of the second resonant circuit are adjusted, so that the power of an output signal is controlled.
9. The gain fluctuation adjustment method according to claim 8, wherein the voltage-controlled variable capacitance devices D1 and D2 are controlled by a change in the voltage at the control voltage terminal VCC.
10. The gain fluctuation adjustment method as claimed in claim 8, wherein a negative feedback terminal of the power amplifier circuit is connected to the control voltage terminal VCC.
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| CN107332535A (en) * | 2017-06-26 | 2017-11-07 | 武汉凡谷电子技术股份有限公司 | It is a kind of to be used to adjust the circuit arrangement that microstrip line transmits phase |
| CN109714013B (en) * | 2018-11-27 | 2023-06-16 | 京信网络系统股份有限公司 | Gain-adjustable equalizer, equalizer circuit capable of automatically adjusting gain and method |
| CN109714013A (en) * | 2018-11-27 | 2019-05-03 | 京信通信系统（中国）有限公司 | Tunable gain equalizer, the equalizer and method that gain can be automatically adjusted |
| CN113131963A (en) * | 2019-12-31 | 2021-07-16 | 深圳市大富科技股份有限公司 | Compensation circuit and communication circuit |
| CN113467320A (en) * | 2021-07-21 | 2021-10-01 | 西安龙飞电气技术有限公司 | Weak signal detection algorithm based on gain compensation |
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