CN103516321A - Power attenuation circuit and closed loop power control circuit - Google Patents
Power attenuation circuit and closed loop power control circuit Download PDFInfo
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- CN103516321A CN103516321A CN201210226489.5A CN201210226489A CN103516321A CN 103516321 A CN103516321 A CN 103516321A CN 201210226489 A CN201210226489 A CN 201210226489A CN 103516321 A CN103516321 A CN 103516321A
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Abstract
The invention provides a power attenuation circuit applied to a closed loop power control circuit. The power attenuation circuit comprises a first resistor, a second resistor and a variable attenuation module, wherein the variable attenuation module comprises a variable voltage source and a variable resistance module. The resistance value of the variable resistance module is adjusted by the variable voltage source according to output power of a power amplifier of the closed loop power control circuit. When the value of the output power of the power amplifier is larger than a first preset power value, the resistance value of the variable resistance module is adjusted to be a first preset resistance value. When the value of the output power of the power amplifier is smaller than a second preset power value, the resistance value of the variable resistance module is adjusted to be a second preset resistance value. The first preset resistance value is a resistance value enabling a frequency converter to work normally and the second preset resistance value is smaller than the first preset resistance value. According to the power attenuation circuit, normal operation of the frequency converter is guaranteed when the power is high, the reject ratio of a closed loop power control test is greatly reduced when the power is low, and manpower and material resources are saved.
Description
Technical field
The present invention relates to the power control techniques field of mobile terminal, relate in particular to a kind of power attenuation circuit and close-loop power control circuit.
Background technology
In cdma system, each channel can be subject to it from the interference of other channel, and this interference is that disturb a kind of intrinsic inherence, and therefore, cdma system is self-interference system.Communication terminal for reduce and other communication terminal between signal disturb, need to carry out close-loop power control, so-called close-loop power control, refers to the process that feedback information that transmitting terminal is sent here according to receiving terminal is controlled transmitting power.
Fig. 1 is the structural representation of close-loop power control circuit, in mobile terminal, frequency converter sends to power amplifier by the signal of reception, power amplifier carries out power amplification to signal, then power amplifier feeds back to frequency converter by the test section of power output, frequency converter can be learnt the size of mobile terminal power output by feedback signal, thereby precisely controls the transmitting power of mobile terminal.Wherein, the test section of power amplifier output power obtains by coupler conventionally, and such as 20dB coupler, transmitting power subtracts the power that 20dB obtains and is test section, and test section is equivalent to sample to transmitting, and intercepts centesimal power.Because the scope of the power output of power amplifier is very large, in order to guarantee frequency converter normal operation, as shown in Figure 2, must between coupler and frequency converter, add attenuator circuit, attenuator circuit in Fig. 2 generally includes: the annexation of the first resistance R 1, the second resistance R 2 and 3, three resistance of the 3rd resistance R as shown in Figure 3.The scope of power amplifier output power, generally from-50dBm left and right to 23dBm, in order to guarantee frequency converter normal operation, adds 3dB attenuation network conventionally.
In the actual production of mobile terminal, the fraction defective that closed-loop power control is tested this link is always all higher, and especially the closed-loop power control in low-power situation, needs repeatedly to measure sometimes, so wasting manpower and material resources.
Summary of the invention
In view of this, the invention provides a kind of power attenuation circuit, for solving the actual production at mobile terminal, the fraction defective that closed-loop power control is tested this link is always all higher, especially the closed-loop power control in low-power situation, sometimes need repeatedly to measure, so wasting manpower and material resources's problem.Its technical scheme is as follows:
A circuit, is applied to, in close-loop power control circuit, comprising: the first resistance and the second resistance, also comprise: variable attenuation module;
Described variable attenuation module comprises: variable voltage source and variable resistor module;
The first input end of described variable resistor module is connected with described variable voltage source, the second input of described variable resistor module is connected with the output of the coupler of described close-loop power control circuit, and the output of described variable resistor module is connected with the input of the frequency converter of described close-loop power control circuit; The first end of described the first resistance is connected with the second input of described variable resistor module, the second end ground connection of described the first resistance; The first end of described the second resistance is connected with the output of described variable resistor module, the second end ground connection of described the second resistance;
Described variable voltage source regulates the resistance value of described variable resistor module according to the power output of the power amplifier of described close-loop power control circuit; when the power output of described power amplifier is greater than the first default performance number; by resistance value adjusting to the first preset resistance value of described variable resistor module; when the power output of described power amplifier is less than the second default performance number, the resistance of described variable resistor module is adjusted to the second preset resistance value;
Described the first preset resistance value is the resistance value that makes frequency converter normal operation, and described the second preset resistance value is less than described the first preset resistance value.
Described variable resistor module comprises: the 3rd resistance and PIN diode;
Described the 3rd first end of resistance and the output of described coupler are connected, and the second end of described the 3rd resistance is connected with the input of described frequency converter; The output of described variable voltage source is connected with the first end of described the 3rd resistance; The anode of described PIN diode is connected with the output of described variable voltage source, and the negative electrode of described PIN diode is connected with the second end of described the 3rd resistance;
When the power output of described power amplifier is greater than the first default performance number, described variable voltage source is closed described PIN diode, the resistance value of described variable resistor module is the resistance of described the 3rd resistance, described the first preset resistance value is the resistance value of described the 3rd resistance, and described variable attenuation module is by the power output of power amplifier described in described the 3rd resistance decrement;
When the power output of described power amplifier is less than the second default performance number, described variable voltage source makes described PIN diode conducting, described PIN diode is in parallel with described the 3rd resistance, the resistance value of described variable resistor module is the resistance value of described PIN diode after in parallel with described the 3rd resistance, described the second preset resistance value is the resistance value of described PIN diode after in parallel with described the 3rd resistance, and described variable attenuation module is by the power output of power amplifier described in described PIN diode and described the 3rd resistance decrement.
Described variable resistor module comprises: the 3rd resistance, PIN diode and the 4th resistance;
Described the 3rd first end of resistance and the output of described coupler are connected, and the second end of described the 3rd resistance is connected with the input of described frequency converter; Described the 4th first end of resistance and the output of described variable voltage source are connected, and the second end of described the 4th resistance is connected with the first end of described the 3rd resistance; The anode of described PIN diode is connected with the output of described variable voltage source, and the negative electrode of described PIN diode is connected with the second end of described the 3rd resistance;
When the power output of described power amplifier is greater than the first default performance number, described variable voltage source is closed described PIN diode, the resistance of described variable resistor module is the resistance value of described the 3rd resistance, described the first preset resistance value is the resistance value of described the 3rd resistance, and described variable attenuation module is by the power output of power amplifier described in described the 3rd resistance decrement;
When the power output of described power amplifier is less than the second default performance number, described variable voltage source makes described PIN diode conducting, described the 4th resistance and described the 3rd resistance are in parallel, the resistance value of described variable resistor module is the resistance value of described the 4th resistance after in parallel with described the 3rd resistance, described the second preset resistance value is the resistance value of the 4th resistance after in parallel with described the 3rd resistance, and described variable attenuation module is by the power output of power amplifier described in described the 4th resistance and described the 3rd resistance decrement.
Preferably, described variable attenuation module also comprises: inductance;
Described inductance is serially connected with between described variable voltage source and described variable resistor module, for the radiofrequency signal of power amplifier output is formed to high resistant, reduces the impact on variable voltage source.
Described variable resistor module is thyrite;
When the power output of described power amplifier is greater than the first default performance number, described variable voltage source regulates the resistance value of described thyrite, making described thyrite resistance is the first preset resistance value, and described variable attenuation module is by the decay power output of described power amplifier of described thyrite;
When the power output of described power amplifier is less than the second default performance number, described variable voltage source regulates the resistance value of described thyrite, the resistance that makes described thyrite is the second preset resistance value, and described variable attenuation module is by the decay power output of described power amplifier of described thyrite.
Described attenuation module comprises: the 5th resistance and thyrite;
Described the 5th first end of resistance and the output of coupler are connected, and the second end of described the 5th resistance is connected with the input of described frequency converter; The first input end of described thyrite is connected with described voltage controlled voltage source, and the second input of described thyrite is connected with the second end of described the 5th resistance, and the output of described thyrite is connected with the second end of described the 5th resistance;
When the power output of described power amplifier is greater than the first default performance number, described variable voltage source regulates the resistance of described thyrite, making the resistance after described the 5th resistance and described thyrite parallel connection is the first preset resistance value, and described variable attenuation module is by the power output of power amplifier described in described thyrite and described the 5th resistance decrement;
When the power output of described power amplifier is less than the first default performance number, described variable voltage source regulates the resistance of described thyrite, making the resistance after described the 5th resistance and described thyrite parallel connection is the second preset resistance value, and described variable attenuation module is by the power output of power amplifier described in described thyrite and described the 5th resistance decrement.
Preferably, above-mentioned attenuator circuit, also comprises: the first electric capacity and the second electric capacity;
Described the first capacitance series is between described variable resistor module and described coupler, described the second capacitance series is between described variable resistor module and described frequency converter, and described the first electric capacity and the second electric capacity are by the DC-isolation in described coupler output signal.
A circuit, comprises above-mentioned power attenuation circuit.
Power attenuation circuit provided by the invention and close-loop power control circuit, according to the power output of power amplifier, regulate the resistance value of variable resistor module, when the power output of power amplifier is greater than the first default performance number, by resistance value adjusting to the first preset resistance value of variable resistor module, the power output of power amplifier is decayed by default pad value, and while having guaranteed high power, frequency converter can work; When the power output of power amplifier is less than the second default performance number, the resistance of variable resistor module is adjusted to the second preset resistance value, the power output of power amplifier is decayed, the power detection error while having reduced low-power by less pad value.Power attenuation circuit provided by the invention, while both having guaranteed high power, frequency converter can work, and while greatly reducing low-power again, the fraction defective of close-loop power control test, has saved manpower and materials.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the structural representation of close-loop power control circuit in prior art;
Fig. 2 is the structural representation of close-loop power control circuit in prior art;
Fig. 3 is the structural representation of power attenuation circuit in prior art;
Fig. 4 is the structural representation of power attenuation circuit provided by the invention;
The structural representation of the power attenuation circuit that Fig. 5 provides for the embodiment of the present invention one;
The structural representation of the power attenuation circuit that Fig. 6 provides for the embodiment of the present invention two;
The structural representation of the power attenuation circuit that Fig. 7 provides for the embodiment of the present invention three;
The structural representation of the power attenuation circuit that Fig. 8 provides for the embodiment of the present invention four.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Inventor finds in realizing the process of the invention, in prior art, there are the following problems: whether the watt level no matter power amplifier is exported, 3dB always will decay, when the power output of power amplifier is higher, decay 3dB can not cause Power Control Problem, but, when the power output of power amplifier is lower, if the 3dB that decays again will cause power detection error to increase.In view of this, the invention provides a kind of power attenuation circuit, be applied in close-loop power control circuit, Fig. 4 is the structural representation of this power attenuation circuit, this power attenuation circuit comprises: the first resistance R 1, the second resistance R 2 and variable attenuation module 1, wherein, variable attenuation module 1 comprises: variable voltage source 11 and variable resistor module 12.
The first input end of variable resistor module 12 is connected with the output of variable voltage source 12, the second input of variable resistor module 12 is connected with the output of the coupler of close-loop power control circuit, and the output of variable resistor module 12 is connected with the input of the frequency converter of close-loop power control circuit; The first end of the first resistance R 1 is connected with the second input of variable resistor module 12, the second end ground connection of the first resistance R 1; The first end of the second resistance R 2 is connected with the output of variable resistor module 12, the second end ground connection of the second resistance R 2.
Variable voltage source 11 regulates the resistance value of variable resistor module 12 according to the power output of the power amplifier of close-loop power control circuit, when the power output of power amplifier is greater than the first default performance number, the resistance of variable resistor module 12 is adjusted to the first preset resistance value, and variable attenuation module 1 is by the power output of variable resistor module 12 decay power amplifiers; When the power output of power amplifier is less than the second default performance number, by resistance value adjusting to the second preset resistance value of variable resistor module 12, variable attenuation module 1 is by the power output of variable resistor module 12 decay power amplifiers.Wherein, the first preset resistance value is the resistance value that makes frequency converter normal operation, and the second preset resistance value is less than the first preset resistance value.
If power attenuation main circuit provided by the invention is by the power output of variable resistor module 12 decay power amplifiers, the pad value of power attenuation circuit is directly proportional to the resistance value of variable resistor module 12, the resistance value of variable resistor module 12 is larger, the pad value of power attenuation circuit is larger, otherwise, the resistance value of variable resistor module 12 is less, and the pad value of power attenuation circuit is less.
Power attenuation circuit provided by the invention and close-loop power control circuit, according to the power output of power amplifier, regulate the resistance value of variable resistor module, when the power output of power amplifier is greater than the first default performance number, by resistance value adjusting to the first preset resistance value of variable resistor module, the power output of power amplifier is decayed by default pad value, and while having guaranteed high power, frequency converter can work; When the power output of power amplifier is less than the second default performance number, the resistance of variable resistor module is adjusted to the second preset resistance value, the power output of power amplifier is decayed, the power detection error while having reduced low-power by less pad value.By power attenuation circuit provided by the invention, while both having guaranteed high power, frequency converter can work, and while greatly reducing low-power again, the fraction defective of close-loop power control test, has saved manpower and materials.
Embodiment mono-
The embodiment of the present invention one provides a kind of power attenuation circuit, Fig. 5 is the structural representation of this attenuator circuit, the power attenuation circuit that the embodiment of the present invention one provides comprises: the first resistance R 1, the second resistance R 2 and variable attenuation module 11, wherein, variable attenuation module 11 comprises: variable voltage source 111 and variable resistor module 112 and inductance L.Variable resistor module 112 in the embodiment of the present invention one comprises: the 3rd resistance R 3 and PIN diode D.
The 3rd first end of resistance R 3 and the output of coupler of variable resistor module 112 are connected, and the second end of the 3rd resistance R 3 is connected with the input of frequency converter; The first end of inductance L is connected with the output of variable voltage source 111, and the second end of inductance L is connected with the first end of the 3rd resistance R 3; The anode of PIN diode D is connected with the second end of inductance L, and the negative electrode of PIN diode D is connected with the second end of the 3rd resistance R 3; The first end of the first resistance R 1 is connected with the first end of the 3rd resistance R 3, the second end ground connection of the first resistance R 1; The first end of the second resistance R 2 is connected with the second end of the 3rd resistance R 3, the second end ground connection of the second resistance R 2.Inductance L in the present embodiment, for to radio frequency signal formation high resistant, reduces the impact on variable voltage source.
When the power output of power amplifier is greater than the first default performance number, variable voltage source 111 is closed PIN diode D, now, the resistance value of variable resistor module 112 is the resistance value of the 3rd resistance R 3, and variable attenuation module 11 is by the power output of the 3rd resistance R 3 decay power amplifiers; When the power output of power amplifier is less than the second default performance number, variable voltage source 111 makes PIN diode D conducting, now, PIN diode D is in parallel with the 3rd resistance R 3, the resistance of variable resistor module 112 is the resistance value of PIN diode D after in parallel with the 3rd resistance R 3, and variable attenuation module 11 is by the power output of PIN diode D and the 3rd resistance R 3 decay power amplifiers.
In the embodiment of the present invention one, conducting by PIN diode D and close the resistance value that changes variable resistor module, when the power output of power amplifier is greater than the first default performance number, PIN diode D closes, variable attenuation module is by the power output of the 3rd resistance R 3 decay power amplifiers, while having guaranteed high power, frequency converter can work, and the first preset resistance value is the resistance value of the 3rd resistance R 3; When the power output of power amplifier is less than the second default performance number, PIN diode D conducting, variable attenuation module is by the power output of the 3rd resistance R 3 and PIN diode D decay power amplifier, the second preset resistance value is the resistance in parallel of the 3rd resistance R 3 and PIN diode D, because the second preset resistance value is less, the power output of power amplifier is decayed, the power detection error while having reduced low-power by less pad value.
The power attenuation circuit that the embodiment of the present invention one provides, while both having guaranteed high power, frequency converter can work, and while greatly reducing low-power again, the fraction defective of closed-loop power control test, has saved manpower and materials.
Embodiment bis-
The embodiment of the present invention two provides a kind of power attenuation circuit, Fig. 6 is the structural representation of this damping resistance, the power attenuation circuit that the embodiment of the present invention two provides comprises: the first resistance R 1, the second resistance R 2 and variable attenuation module 21, wherein, variable attenuation module 21 comprises: variable voltage source 211, variable resistor module 212 and inductance L.Variable resistor module 212 in the embodiment of the present invention two comprises: the 3rd resistance R 3, the 4th resistance R 4 and PIN diode D.
The 3rd first end of resistance R 3 and the output of coupler of variable resistor module 212 are connected, and the second end of the 3rd resistance R 3 is connected with the input of frequency converter; The first end of inductance L is connected with variable voltage source 211, and the second end of inductance L is connected with the first end of the 4th resistance R 4, and the second end of the 4th resistance R 4 is connected with the first end of the 3rd resistance R 3; The anode of PIN diode D is connected with the second end of inductance L, and the negative electrode of PIN diode D is connected with the second end of the 3rd resistance R 3; The first end of the first resistance R 1 is connected with the first end of the 3rd resistance R 3, the second end ground connection of the first resistance R 1; The first end of the second resistance R 2 is connected with the second end of the 3rd resistance R 3, the second end ground connection of the second resistance R 2.Inductance L in the present embodiment, for to radio frequency signal formation high resistant, reduces the impact on variable voltage source.
When the power output of power amplifier is greater than the first default performance number, variable voltage source 211 is closed PIN diode D, now, the resistance value of variable resistor module 212 is the resistance value of the 3rd resistance R 3, and variable attenuation module 21 is by the power output of the 3rd resistance R 3 decay power amplifiers; When the power output of power amplifier is less than the second default performance number, variable voltage source 211 makes PIN diode D conducting, now, the 3rd resistance R 3 is in parallel with the 4th resistance R 4 after connecting with PIN diode D, because the resistance value of PIN diode D is less, can ignore, therefore, the resistance value of variable resistor module is the resistance value of the 3rd resistance R 3 after in parallel with the 4th resistance R 4, and attenuation module is by the power output of the 3rd resistance R 3 and the 4th resistance R 4 decay power amplifiers.It should be noted that, the PIN diode in the present embodiment can be replaced by other device, as long as the device using possesses conducting and the closing function that PIN diode has, is all the scope of protection of the invention.
In addition, power attenuation circuit in the present embodiment also comprises: the first capacitor C 1 and the second capacitor C 2, the first capacitor C 1 is serially connected with between variable resistor module 212 and coupler, the second capacitor C 2 is serially connected with between variable resistor module 212 and frequency converter, and the first capacitor C 1 and the second capacitor C 2 are by the DC-isolation in coupler output signal.
In the embodiment of the present invention two, conducting by PIN diode D and close the resistance value that changes variable resistor module, when the power output of power amplifier is greater than the first default performance number, PIN diode D closes, variable attenuation module is by the power output of the 3rd resistance R 3 decay power amplifiers, while having guaranteed high power, frequency converter can work, and the first preset resistance value is the resistance value of the 3rd resistance R 3; When the power output of power amplifier is less than the second default performance number, PIN diode D conducting, variable attenuation module is by the power output of the 3rd resistance R 3 and the 4th resistance R 4 decay power amplifiers, the second preset resistance value is the resistance value of the 3rd resistance R 3 and the 4th resistance R 4 parallel connections, because the second preset resistance value is less than the first preset resistance value, the power output of power amplifier is decayed, the power detection error while having reduced low-power by less pad value.In addition, compare with embodiment, the 4th resistance R 4 of the present embodiment can make variable attenuation by the more preferably power output of pad value decay power amplifier.
The power attenuation circuit that the embodiment of the present invention two provides, while both having guaranteed high power, frequency converter can work, and while greatly reducing low-power again, the fraction defective of closed-loop power control test, has saved manpower and materials.
Embodiment tri-
The embodiment of the present invention three provides a kind of power attenuation circuit, Fig. 7 is the structural representation of this power attenuation circuit, the power attenuation circuit that the embodiment of the present invention three provides comprises: the first resistance R 1, the second resistance R 2 and variable attenuation module 31, wherein, variable attenuation module 31 comprises: variable voltage source 311 and variable resistor module 312.Variable resistor module 312 in the embodiment of the present invention three comprises: thyrite VCR.
The first input end of thyrite VCR is connected with the output of variable voltage source 311, the second input of thyrite VCR is connected with the output of the coupler of close-loop power control circuit, and the output of thyrite VCR is connected with the input of the frequency converter of close-loop power control circuit; The first end of the first resistance R 1 is connected with the second input of thyrite VCR, the second end ground connection of the first resistance R 1; The first end of the second resistance R 2 is connected with the output of thyrite VCR, the second end ground connection of the second resistance R 2.
In the embodiment of the present invention three, when the power output of power amplifier is greater than the first default performance number, variable voltage source regulates resistance value to the first preset resistance value of thyrite VCR, and while having guaranteed high power, frequency converter can work; When the power output of power amplifier is less than the second default performance number, variable voltage source regulates resistance value to the second preset resistance value of thyrite VCR, and the second preset resistance value is less than the first preset resistance value, this makes the power output of power amplifier decay by less pad value, the power detection error while having reduced low-power.
The power attenuation circuit that the embodiment of the present invention three provides, while both having guaranteed high power, frequency converter can work, and while greatly reducing low-power again, the fraction defective of closed-loop power control test, has saved manpower and materials.
Embodiment tetra-
The embodiment of the present invention four provides a kind of power attenuation circuit, Fig. 8 is the structural representation of this power attenuation circuit, the power attenuation circuit that the embodiment of the present invention four provides comprises: the first resistance R 1, the second resistance R 2 and variable attenuation module 41, wherein variable attenuation module 41 comprises: variable voltage source 411 and variable resistor module 412.Variable resistor module 412 in the embodiment of the present invention four comprises: thyrite VCR and the 5th resistance R 5.
The 5th first end of resistance R 5 and the output of coupler of variable resistor module 412 are connected, and the second end of the 5th resistance R 5 is connected with the input of frequency converter; The first input end of thyrite VCR is connected with the output of variable voltage source 411, and the second input of thyrite VCR is connected with the first end of the 5th resistance R 5, and the output of thyrite VCR is connected with the second end of the 5th resistance R 5; The first end of the first resistance R 1 is connected with the first end of the 5th resistance R 5, the second end ground connection of the first resistance R 1; The first end of the second resistance R 2 is connected with the second end of the 5th resistance R 5, the second end ground connection of the second resistance R 2.
When the power output of power amplifier is greater than the first default performance number, variable voltage source 411 regulates the resistance of thyrite VCR, making the resistance value after the 5th resistance R 5 and thyrite VCR parallel connection is the first preset resistance value, and variable attenuation module 41 is by the power output of thyrite VCR and the 5th resistance R 5 decay power amplifiers; When the power output of power amplifier is less than the second default performance number, variable voltage source 411 regulates the resistance value of thyrite VCR, making the resistance value after the 5th resistance R 5 and thyrite VCR parallel connection is the second preset resistance value, and variable attenuation module 41 is by the power output of thyrite VCR and the 5th resistance R 5 decay power amplifiers.Wherein, the first preset resistance value is the resistance value that makes frequency converter normal operation, and the second preset resistance value is less than the first preset resistance value.Variable voltage source in the present embodiment is digital to analog converter DAC, regulates the resistance value of thyrite by digital to analog converter DAC.
In the embodiment of the present invention four, when the power output of power amplifier is greater than the first default performance number, variable voltage source regulates the resistance value of thyrite VCR, making the parallel resistance value of thyrite VCR and the 5th resistance R 5 is the first preset resistance value, and while having guaranteed high power, frequency converter can work; When the power output of power amplifier is less than the second default performance number, it is the second preset resistance value that variable voltage source regulates the resistance value of thyrite VCR to make the parallel resistance value of thyrite VCR and the 5th resistance R 5, and the second preset resistance value is less than the first preset resistance value, this makes the power output of power amplifier decay by less pad value, the power detection error while having reduced low-power.
The power attenuation circuit that the embodiment of the present invention four provides, while both having guaranteed high power, frequency converter can work, and while greatly reducing low-power again, the fraction defective of closed-loop power control test, has saved manpower and materials.
Embodiment five
The embodiment of the present invention five provides a kind of close-loop power control circuit, and this circuit comprises: frequency converter, power amplifier, coupler and variable attenuation circuit, wherein, variable attenuation circuit is any one variable attenuation circuit in embodiment mono-to four.
The close-loop power control circuit that the embodiment of the present invention five provides, while both having guaranteed high power, frequency converter can work, and while greatly reducing low-power again, the fraction defective of closed-loop power control test, has saved manpower and materials.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a power attenuation circuit, is applied to, in close-loop power control circuit, comprising: the first resistance and the second resistance, it is characterized in that, and also comprise: variable attenuation module;
Described variable attenuation module comprises: variable voltage source and variable resistor module;
The first input end of described variable resistor module is connected with described variable voltage source, the second input of described variable resistor module is connected with the output of the coupler of described close-loop power control circuit, and the output of described variable resistor module is connected with the input of the frequency converter of described close-loop power control circuit; The first end of described the first resistance is connected with the second input of described variable resistor module, the second end ground connection of described the first resistance; The first end of described the second resistance is connected with the output of described variable resistor module, the second end ground connection of described the second resistance;
Described variable voltage source regulates the resistance value of described variable resistor module according to the power output of the power amplifier of described close-loop power control circuit; when the power output of described power amplifier is greater than the first default performance number; by resistance value adjusting to the first preset resistance value of described variable resistor module; when the power output of described power amplifier is less than the second default performance number, the resistance of described variable resistor module is adjusted to the second preset resistance value;
Described the first preset resistance value is the resistance value that makes frequency converter normal operation, and described the second preset resistance value is less than described the first preset resistance value.
2. circuit according to claim 1, is characterized in that, described variable resistor module comprises: the 3rd resistance and PIN diode;
Described the 3rd first end of resistance and the output of described coupler are connected, and the second end of described the 3rd resistance is connected with the input of described frequency converter; The output of described variable voltage source is connected with the first end of described the 3rd resistance; The anode of described PIN diode is connected with the output of described variable voltage source, and the negative electrode of described PIN diode is connected with the second end of described the 3rd resistance;
When the power output of described power amplifier is greater than the first default performance number, described variable voltage source is closed described PIN diode, the resistance value of described variable resistor module is the resistance of described the 3rd resistance, described the first preset resistance value is the resistance value of described the 3rd resistance, and described variable attenuation module is by the power output of power amplifier described in described the 3rd resistance decrement;
When the power output of described power amplifier is less than the second default performance number, described variable voltage source makes described PIN diode conducting, described PIN diode is in parallel with described the 3rd resistance, the resistance value of described variable resistor module is the resistance value of described PIN diode after in parallel with described the 3rd resistance, described the second preset resistance value is the resistance value of described PIN diode after in parallel with described the 3rd resistance, and described variable attenuation module is by the power output of power amplifier described in described PIN diode and described the 3rd resistance decrement.
3. circuit according to claim 1, is characterized in that, described variable resistor module comprises: the 3rd resistance, PIN diode and the 4th resistance;
Described the 3rd first end of resistance and the output of described coupler are connected, and the second end of described the 3rd resistance is connected with the input of described frequency converter; Described the 4th first end of resistance and the output of described variable voltage source are connected, and the second end of described the 4th resistance is connected with the first end of described the 3rd resistance; The anode of described PIN diode is connected with the output of described variable voltage source, and the negative electrode of described PIN diode is connected with the second end of described the 3rd resistance;
When the power output of described power amplifier is greater than the first default performance number, described variable voltage source is closed described PIN diode, the resistance of described variable resistor module is the resistance value of described the 3rd resistance, described the first preset resistance value is the resistance value of described the 3rd resistance, and described variable attenuation module is by the power output of power amplifier described in described the 3rd resistance decrement;
When the power output of described power amplifier is less than the second default performance number, described variable voltage source makes described PIN diode conducting, described the 4th resistance and described the 3rd resistance are in parallel, the resistance value of described variable resistor module is the resistance value of described the 4th resistance after in parallel with described the 3rd resistance, described the second preset resistance value is the resistance value of the 4th resistance after in parallel with described the 3rd resistance, and described variable attenuation module is by the power output of power amplifier described in described the 4th resistance and described the 3rd resistance decrement.
4. according to the circuit described in claim 1,2 or 3, it is characterized in that, described variable attenuation module also comprises: inductance;
Described inductance is serially connected with between described variable voltage source and variable resistor module, for the radiofrequency signal of power amplifier output is formed to high resistant, reduces the impact on variable voltage source.
5. circuit according to claim 1, is characterized in that, described variable resistor module is thyrite;
When the power output of described power amplifier is greater than the first default performance number, described variable voltage source regulates the resistance value of described thyrite, making described thyrite resistance is the first preset resistance value, and described variable attenuation module is by the decay power output of described power amplifier of described thyrite;
When the power output of described power amplifier is less than the second default performance number, described variable voltage source regulates the resistance value of described thyrite, the resistance that makes described thyrite is the second preset resistance value, and described variable attenuation module is by the decay power output of described power amplifier of described thyrite.
6. circuit according to claim 1, is characterized in that, described attenuation module comprises: the 5th resistance and thyrite;
Described the 5th first end of resistance and the output of coupler are connected, and the second end of described the 5th resistance is connected with the input of described frequency converter; The first input end of described thyrite is connected with described voltage controlled voltage source, and the second input of described thyrite is connected with the second end of described the 5th resistance, and the output of described thyrite is connected with the second end of described the 5th resistance;
When the power output of described power amplifier is greater than the first default performance number, described variable voltage source regulates the resistance of described thyrite, making the resistance after described the 5th resistance and described thyrite parallel connection is the first preset resistance value, and described variable attenuation module is by the power output of power amplifier described in described thyrite and described the 5th resistance decrement;
When the power output of described power amplifier is less than the first default performance number, described variable voltage source regulates the resistance of described thyrite, making the resistance after described the 5th resistance and described thyrite parallel connection is the second preset resistance value, and described variable attenuation module is by the power output of power amplifier described in described thyrite and described the 5th resistance decrement.
7. circuit according to claim 1, is characterized in that, also comprises: the first electric capacity and the second electric capacity;
Described the first capacitance series is between described variable resistor module and described coupler, described the second capacitance series is between described variable resistor module and described frequency converter, and described the first electric capacity and the second electric capacity are by the DC-isolation in described coupler output signal.
8. a close-loop power control circuit, is characterized in that, comprises power attenuation circuit as claimed in any of claims 1 to 7 in one of claims.
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| CN201210226489.5A CN103516321B (en) | 2012-06-29 | 2012-06-29 | A kind of power attenuation circuit and close-loop power control circuit |
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| CN201210226489.5A CN103516321B (en) | 2012-06-29 | 2012-06-29 | A kind of power attenuation circuit and close-loop power control circuit |
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| CN103516321B CN103516321B (en) | 2016-03-30 |
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| CN108554757A (en) * | 2017-12-20 | 2018-09-21 | 四川泰猷科技有限公司 | A kind of power regulation resistance determining method and device |
| CN114598298A (en) * | 2022-05-07 | 2022-06-07 | 深圳市鼎阳科技股份有限公司 | Ultra-wideband variable attenuator |
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| CN103516321B (en) | 2016-03-30 |
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