CN205092828U - Solid -state power amplifier's blasting protection circuit - Google Patents
Solid -state power amplifier's blasting protection circuit Download PDFInfo
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- CN205092828U CN205092828U CN201520905344.7U CN201520905344U CN205092828U CN 205092828 U CN205092828 U CN 205092828U CN 201520905344 U CN201520905344 U CN 201520905344U CN 205092828 U CN205092828 U CN 205092828U
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Abstract
The utility model relates to a solid -state power amplifier technical field, the utility model discloses a solid -state power amplifier's blasting protection circuit specifically includes automatic level control loop and on -off control loop. Through the threshold value that sets up the automatic level control loop, it is stable at a certain specified power level that excitation input power will be crossed in the realization, the back is started to control at the automatic level control loop to delay disjunction gate limit realization through setting up the on -off control loop, opens the RF switch, and the drive signal that crosses before preventing to start to control gets into the radio -frequency amplification link. Cooperation through two circuit is used, when the input was drive signal, realizes the protection to follow -up equipment, simultaneously crossing that drive signal carries out the amplitude control and being not only that the delay switch's that uses among the prior art break -make prevents the blasting the input. The utility model discloses in do not use general blasting protective device clipper -limiter to avoid the deterioration of indexs such as transmitting system harmonic, third -order on intermodulation, noise coefficient.
Description
Technical field
The utility model relates to solid-state power amplifier technical field; specifically a kind of over-excitation protection circuit of solid-state power amplifier; under the prerequisite not worsening the linearity, solve the blasting that the excessive blasting that causes of input signal and own temperature characteristic cause simultaneously.
Background technology
The power output of solid-state power amplifier is saturated gradually along with the increase of input power, if input power continues to increase (blasting), the linearity index such as harmonic wave, third order intermodulation, noise factor of system will worsen very soon, and solid state power device such as GaAs, gallium nitride Microwave Power Tubes may cause and burn simultaneously.
In use, blasting is mainly from two aspects for solid-state power amplifier.One is that input end signal is excessive, as erroneous input or when power amplifier front-end module has alc circuit, and the overshoot before loop stability; Two is that the temperature characterisitic of solid state power amplifier self causes, and when low temperature, amplifying link gain significantly increases, and now same radio-frequency (RF) input power will cause the blasting of power amplifier.
The blasting of existing solution solid-state power amplifier mainly adds amplitude limiter at input.When input power is greater than certain value, by the copped wave characteristic of amplitude limiter, input power will be made constant in certain fixed value.Because amplitude limiter mainly make use of the nonlinear characteristic of semiconductor, the deterioration of the indexs such as emission system harmonic wave, third order intermodulation, noise factor will be caused.And independent amplitude limiter can not solve the blasting problem that power amplifier own temperature characteristic causes.
CN200810239302.9 patent discloses a kind of over-excitation protection circuit, is made up of coupler, power detection module, voltage comparison module, switch/attenuation module and time delay module.A part for the main signal of input is coupled by coupler, obtains power signal transmissions to power detection module; The amplitude of power signal is converted into corresponding voltage and is supplied to voltage comparison module by power detection module; The threshold voltage of the voltage received and setting compares, to produce control signal by voltage comparison module; Switch/attenuation module according to the conducting of the low and high level control link of control signal and disconnection, thus realizes the protection to rear class equipment.Time delay module, arranges delay time for the response time summation according to coupler, power detection module and voltage comparison module, prevents main signal from before control signal, arriving switch/attenuation module.This patent realizes blasting protection by the disconnection of switch/attenuation module and conducting; magnitude of voltage in the voltage signal of power detection module is greater than threshold voltage; then output low level control switch/attenuation module disconnecting link; rear class equipment is protected by the mode of disconnecting link; i.e. simple disconnecting link during blasting; but such over-excitation protection circuit cannot be applied in frequency microwave solid-state power amplifier, reach the time delay of Microsecond grade.From the record of this patent, this patent delay circuit is in radio frequency primary link, and primary link is frequency microwave link, and delay circuit realizes difficulty, and rule of thumb, can only realize at most the time delay of a few nanosecond, long time delay cannot realize; And the time delay of the detection comparison circuit of its lower branch road generally will reach Microsecond grade; therefore to realize the detection comparison circuit that delay circuit amount of delay is longer than lower branch road and carry out control switch break-make; do not have realizability, the over-excitation protection circuit therefore in this patent cannot be applied in the solid-state power amplifier of frequency microwave frequency range.If input blasting signal in this patent to continue simultaneously always, switch can not be opened, and radio frequency link can not work.
Utility model content
The over excited technical problem that the employing amplitude limiter existed for over-excitation protection circuit of the prior art causes the deterioration of the indexs such as emission system harmonic wave, third order intermodulation, noise factor and amplitude limiter can not solve power amplifier own temperature characteristic causing, the utility model discloses a kind of over-excitation protection circuit of solid-state power amplifier.
The technical solution of the utility model is as follows:
The utility model discloses a kind of over-excitation protection circuit of solid-state power amplifier, it specifically comprises auto level control loop and switching control loop, described switching control loop is used for after auto level control loop starts to control, open radio-frequency (RF) switch again, described auto level control loop comprises coupler, detector amplifier, first comparator, first threshold circuit and voltage-controlled attenuator, the input of described voltage-controlled attenuator connects the input of main signal, the input of output butt coupling device, a part of signal of coupler exports to detector amplifier, part signal exports to the radio-frequency (RF) switch of switching control loop, the output of detector amplifier connects the delay circuit of the first comparator and switching control loop respectively, and the first comparator connects the first threshold circuit, and its comparative result inputs to voltage-controlled attenuator as control signal.
Further, above-mentioned switching control loop comprises coupler, detector amplifier, delay circuit, the second comparator, the second threshold circuit and radio-frequency (RF) switch, described delay circuit connects the second comparator, second comparator connects the second threshold circuit, and the comparative result of the second comparator inputs to radio-frequency (RF) switch as control signal.
Further; above-mentioned over-excitation protection circuit also comprises low temperature over-excitation protection circuit; described low temperature over-excitation protection circuit adopts temperature compensation attenuator to realize, and the input of described temperature compensation attenuator connects radio-frequency (RF) switch, and output connects radio frequency and amplifies link.
By adopting above technical scheme, the beneficial effects of the utility model are: this circuit does not introduce nonlinear device, and the voltage-controlled attenuator of radio frequency link, coupler and radio-frequency (RF) switch all have the good linearity.The size of solid state power amplifier power output can by the first threshold circuit free adjustment simultaneously, and over excited thresholding can pass through the second threshold circuit free adjustment.After tested, this circuit is applicable to the blasting protection that bandwidth is less than the continuous wave solid-state power amplifier of 10%.Can realize as input power more than dynamic change 10dB, and under the condition of variations in temperature-35 DEG C ~+70 DEG C, ensure that the power output change of solid-state power amplifier is less than 0.5dB, the anti-blasting input power of solid-state power amplifier can reach more than 20dBm.
Delay circuit in this patent is after detection, and it belongs to low-frequency channel, therefore can realize the time delay of Microsecond grade.This patent owing to adding alc circuit, served as pumping signal always continue time, alc circuit is reduced to rated input power level by the amplitude of blasting signal, and link can work as usual.This patent, owing to adding temperature-compensation circuit, can prevent low temperature blasting problem.
Accompanying drawing explanation
Fig. 1 be the over-excitation protection circuit of solid-state power amplifier of the present utility model realize schematic diagram.
Embodiment
Below in conjunction with Figure of description, describe embodiment of the present utility model in detail.
The utility model discloses a kind of over-excitation protection circuit of solid-state power amplifier, it specifically comprises auto level control loop and switching control loop, described switching control loop is used for after auto level control loop starts to control, open radio-frequency (RF) switch again, prevent the blasting signal before starting to control from entering radio frequency and amplify link, described auto level control loop comprises coupler 11, detector amplifier 12, first comparator 13, first threshold circuit 22 and voltage-controlled attenuator 14, the input of described voltage-controlled attenuator 14 connects the input of main signal, the input of output butt coupling device 11, a part of signal of coupler 11 exports to detector amplifier 12, part signal exports to the radio-frequency (RF) switch of switching control loop, the output of detector amplifier 12 connects the delay circuit of the first comparator 13 and switching control loop respectively, and the first comparator 13 connects the first threshold circuit 22, and its comparative result inputs to voltage-controlled attenuator 14 as control signal.Over-excitation protection circuit of the present utility model is by arranging auto level control loop and switching control loop; power output V2 is stabilized in a certain specified input power levels by auto level control loop; switching control loop is used for after auto level control loop starts to control; open radio-frequency (RF) switch again; prevent the blasting signal before starting to control from entering radio frequency and amplify link; by two circuit with the use of, when being input as blasting signal, realize the protection to follow-up equipment.By auto level control loop, amplitude control is carried out to the blasting signal of input and is not only the simple disconnection of the delay switch used in prior art, the utility model does not use amplitude limiter, thus avoids the deterioration of the indexs such as emission system harmonic wave, third order intermodulation, noise factor.
Further, above-mentioned switching control loop comprises coupler 11, detector amplifier 12, delay circuit 15, second comparator 16, second threshold circuit 23 and radio-frequency (RF) switch 17.A part of signal of described coupler 11 exports to detector amplifier 12, part signal exports to the radio-frequency (RF) switch of switching control loop, the output of detector amplifier 12 connects the delay circuit 15 of the first comparator 13 and switching control loop respectively, delay circuit 15 connects the second threshold circuit 23, and its comparative result inputs to radio-frequency (RF) switch 17 as control signal.
Further; above-mentioned over-excitation protection circuit also comprises low temperature over-excitation protection circuit; described low temperature over-excitation protection circuit adopts temperature compensation attenuator 21 to realize; the input of described temperature compensation attenuator 21 connects radio-frequency (RF) switch 17; output connects radio frequency and amplifies link 3, and the temperature characterisitic that the temperature characterisitic of described temperature compensation attenuator 21 and radio frequency amplify link 3 is complementary.Temperature-compensating is realized by low temperature over-excitation protection circuit.Temperature damping's device can adopt temperature damping's device TVA0500N09W3S of EMCTechnology, and temperature coefficient is 0.045dB/ °.
Fig. 1 be the over-excitation protection circuit of solid-state power amplifier of the present utility model realize schematic diagram, its over-excitation protection circuit comprises an auto level control loop, a switching control loop and a temperature-compensation circuit.Auto level control loop is used for carrying out amplitude control to input blasting signal; Before switching control loop is used for preventing auto level control loop stability, blasting signal enters radio frequency and amplifies link; Temperature-compensation circuit amplifies the temperature characterisitic of link for compensating radio frequency, reduce blasting during low temperature.
Over-excitation protection circuit mainly comprises input over-excitation protection circuit and low temperature over-excitation protection circuit; Input over-excitation protection circuit mainly comprises auto level control loop (loop1) and switching control loop (Loop2).When after system input blasting signal, by regulating threshold circuit (22), the power output V2 of auto level control loop (loop1) will be stabilized in a certain specified input power levels, and stabilization time is T1.
Can total amount of delay T2 of by-pass cock control loop (Loop2) and blasting protection threshold level by the threshold value of the amount of delay of adjustment delay circuit (15) and threshold circuit (23), make T2 > T1.Realize before the stable output power of auto level control loop (loop1) with this, radio-frequency (RF) switch (17) is allowed to be in off-state, after auto level control loop (loop1) is stable, produces control signal by comparator (16) and open radio-frequency (RF) switch (17).
Low temperature over-excitation protection circuit adopts temperature compensation attenuator (21) to realize.The temperature characterisitic that the temperature characterisitic of temperature compensation attenuator (21) and radio frequency amplify link (3) is complementary, and during solution low temperature, radio frequency amplifies the over excited problem of link.
Wherein detecting circuit can adopt Schottky diode detection, and amplification and comparison circuit adopt operational amplifier to complete.Delay circuit (15) adopts RC time delay networking to realize, and by the value of regulating resistance electric capacity, can realize the adjustment of amount of delay.
The technical indicator that radio frequency amplifies link (3) is: saturation output power is continuous wave 51dBm, and gain is greater than 60dB; Specified output continuous wave 50dBm, corresponding rated input power is-10dBm; Under-35 DEG C ~+70 DEG C conditions, the temperature coefficient of change in gain is-0.04dB/ °.
After adding over-excitation protection circuit, when input power excursion is at-5dBm ~ 5dBm, and under the condition of variations in temperature-35 DEG C ~+70 DEG C, solid-state power amplifier power output is changed to 50dBm ~ 50.4dBm; The anti-blasting input power of solid state power amplifier is 20dBm.
Coefficient given in the above embodiments and parameter; be available to those skilled in the art to realize or use utility model; utility model does not limit only gets aforementioned disclosed numerical value; when not departing from the thought of utility model; those skilled in the art can make various modifications or adjustment to above-described embodiment; thus the protection range of utility model not limit by above-described embodiment, and should be the maximum magnitude meeting the inventive features that claims are mentioned.
Claims (3)
1. the over-excitation protection circuit of a solid-state power amplifier, it is characterized in that specifically comprising auto level control loop and switching control loop, described switching control loop is used for after auto level control loop starts to control, open radio-frequency (RF) switch again, described auto level control loop comprises coupler, detector amplifier, first comparator, first threshold circuit and voltage-controlled attenuator, the input of described voltage-controlled attenuator connects the input of main signal, the input of output butt coupling device, a part of signal of coupler exports to detector amplifier, part signal exports to the radio-frequency (RF) switch of switching control loop, the output of detector amplifier connects the delay circuit of the first comparator and switching control loop respectively, and the first comparator connects the first threshold circuit, and the comparative result of the first comparator inputs to voltage-controlled attenuator as control signal.
2. the over-excitation protection circuit of solid-state power amplifier as claimed in claim 1; it is characterized in that described switching control loop comprises coupler, detector amplifier, delay circuit, the second comparator, the second threshold circuit and radio-frequency (RF) switch; described delay circuit connects the second comparator; second comparator connects the second threshold circuit, and the comparative result of the second comparator inputs to radio-frequency (RF) switch as control signal.
3. the over-excitation protection circuit of solid-state power amplifier as claimed in claim 2; it is characterized in that described over-excitation protection circuit also comprises low temperature over-excitation protection circuit; described low temperature over-excitation protection circuit adopts temperature compensation attenuator to realize; the input of described temperature compensation attenuator connects radio-frequency (RF) switch, and output connects radio frequency and amplifies link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520905344.7U CN205092828U (en) | 2015-11-13 | 2015-11-13 | Solid -state power amplifier's blasting protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520905344.7U CN205092828U (en) | 2015-11-13 | 2015-11-13 | Solid -state power amplifier's blasting protection circuit |
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| CN205092828U true CN205092828U (en) | 2016-03-16 |
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| CN201520905344.7U Active CN205092828U (en) | 2015-11-13 | 2015-11-13 | Solid -state power amplifier's blasting protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105227144A (en) * | 2015-11-13 | 2016-01-06 | 中国电子科技集团公司第二十九研究所 | A kind of over-excitation protection circuit of solid-state power amplifier and its implementation |
| CN108355248A (en) * | 2018-02-09 | 2018-08-03 | 苏州无双医疗设备有限公司 | A kind of defibrillating system |
-
2015
- 2015-11-13 CN CN201520905344.7U patent/CN205092828U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105227144A (en) * | 2015-11-13 | 2016-01-06 | 中国电子科技集团公司第二十九研究所 | A kind of over-excitation protection circuit of solid-state power amplifier and its implementation |
| CN108355248A (en) * | 2018-02-09 | 2018-08-03 | 苏州无双医疗设备有限公司 | A kind of defibrillating system |
| CN108355248B (en) * | 2018-02-09 | 2022-02-01 | 苏州无双医疗设备有限公司 | Defibrillation system |
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