CN218679007U - Constant power output amplifier adopting temperature compensation attenuator - Google Patents
Constant power output amplifier adopting temperature compensation attenuator Download PDFInfo
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- CN218679007U CN218679007U CN202223086036.5U CN202223086036U CN218679007U CN 218679007 U CN218679007 U CN 218679007U CN 202223086036 U CN202223086036 U CN 202223086036U CN 218679007 U CN218679007 U CN 218679007U
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Abstract
The utility model relates to an amplifier technical field especially relates to an adopt constant power output amplifier of temperature compensation attenuator, including cavity, outer apron and wire apron, still include microwave circuit board and microwave apron, microwave circuit board and microwave apron set up in the cavity, and the microwave circuit board sets up the temperature compensation attenuator including input isolator, preceding stage amplifier, power amplifier and the output isolator that connects gradually between preceding stage amplifier and power amplifier. The utility model discloses a negative temperature coefficient attenuator, because of its phase place that does not have temperature variation to arouse changes and time delay variation hardly, simple to operate, reliability are high, with low costs, small, can directly be used for replacing complicated active circuit in the radio frequency power amplifier, and the renewal of easy circuit can be applied to satellite transmission subassembly, ground relay transmitting equipment.
Description
Technical Field
The utility model relates to an amplifier technical field especially relates to an adopt temperature compensating attenuator's constant power output amplifier.
Background
An Automatic Gain Control (AGC) amplifier is widely applied to various audio and video transmission and digital intermediate frequency receiving systems, the circuit of a common AGC amplifier can be divided into a preamplifier stage, a gain control stage and a power amplifier output stage, and the circuit form of the gain control stage in the three stages plays a role in determining the final control effect of the AGC amplifier. Therefore, the circuit form of the gain control stage becomes the main basis for the classification of the AGC amplifier.
The common AGC amplifier adopts an electric control attenuator to carry out gain control, and the debugging steps are complicated, as shown in figure 7 and figure 8. Meanwhile, phase change and time delay change caused by temperature change exist, the reliability is low, and the application scene is limited.
SUMMERY OF THE UTILITY MODEL
The utility model provides an adopt constant power output amplifier of temperature compensation attenuator, the gain change that causes because of the temperature variation is offset through the temperature compensation attenuator who adopts negative temperature coefficient, realizes improving the purpose of amplifier temperature characteristic.
In order to realize the utility model discloses an aim, the technical scheme who adopts is: the constant power output amplifier comprises a cavity, an outer cover plate, a lead cover plate, a microwave circuit board and a microwave cover plate, wherein the microwave circuit board and the microwave cover plate are arranged in the cavity, the microwave circuit board comprises an input isolator, a pre-stage amplifier, a power amplifier and an output isolator which are sequentially connected, and a temperature compensation attenuator is arranged between the pre-stage amplifier and the power amplifier.
As the utility model discloses an optimization scheme, microwave circuit board still includes first fixed attenuator and first low pass filter, and first fixed attenuator is connected with the preamplifier, and first low pass filter input is connected with first fixed attenuator, and first low pass filter output is connected with the temperature compensation attenuator.
As the utility model discloses an optimization scheme, the input of temperature compensation attenuator and first low pass filter pass through gold wire bonding pin connection, and the output of temperature compensation attenuator and power amplifier pass through gold wire bonding pin connection, and the GND pin of temperature compensation attenuator passes through gold wire bonding pin connection on the microwave circuit board.
As the utility model discloses an optimization scheme, microwave circuit board still includes band-pass filter and the fixed attenuator of second, and band-pass filter's input is connected with the output of input isolator, and the input of the fixed attenuator of second is connected with band-pass filter's output, and the output of the fixed attenuator of second is connected with the preamplifier.
As the utility model discloses an optimization scheme, microwave circuit board still includes second low pass filter, and second low pass filter's input is connected with power amplifier, and second low pass filter's output is connected with the output isolator.
As an optimization scheme of the utility model, power amplifier includes operational amplifier Q1, first resistance R1, second resistance R2, fourth electric capacity C4, fifth electric capacity C5, sixth electric capacity C6, seventh electric capacity C7, second inductance L2 and third inductance L3, the input of second low pass filter is connected to operational amplifier Q1's output, operational amplifier Q1's the 1 st pin links to each other with the output pin of temperature compensation attenuator, operational amplifier Q1's the 3 rd pin ground connection, operational amplifier Q1's grid offset voltage is connected to a termination of first resistance R1, second resistance R2 and fourth electric capacity C4 all parallel connection are between first resistance R1's the other end and ground, first resistance R1's the other end is connected to second inductance L2's one end, operational amplifier Q1's the 4 th pin is connected to second inductance L2's the other end, fifth electric capacity C5, sixth electric capacity C6 and seventh electric capacity C7 parallel connection are between operational amplifier Q1's the 5 of pin and ground, the third electric capacity L3's the third electric capacity C3 leaky voltage of operational amplifier Q1.
The utility model discloses positive effect has: the utility model discloses a negative temperature coefficient attenuator, because of its phase place that does not have temperature variation to arouse changes and time delay variation hardly, simple to operate, reliability are high, with low costs, small, can directly be used for replacing complicated active circuit in the radio frequency power amplifier, and the renewal of easy circuit can be applied to satellite transmission subassembly, ground relay transmitting equipment.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is an overall structure of the present invention;
fig. 2 is a schematic circuit block diagram of the microwave circuit board of the present invention;
fig. 3 is a schematic diagram of a PCB of the microwave circuit board of the present invention;
FIG. 4 is a plan view of the gold wire bonding of the temperature compensating attenuator of the present invention;
fig. 5 is a circuit diagram of the power amplifier of the present invention;
fig. 6 is a graph of the principle of temperature compensation of the present invention;
FIG. 7 is an analog control block diagram of an AGC amplifier;
fig. 8 is a digital control block diagram of an AGC amplifier.
Wherein: 1. the high-power-consumption low-pass filter comprises a cavity, 2, an outer cover plate, 3, a lead cover plate, 4, a microwave circuit board, 5, a microwave cover plate, 6, an SMA connector, 7, a feedthrough capacitor, 41, an input isolator, 42, a preamplifier, 43, a power amplifier, 44, an output isolator, 45, a temperature compensation attenuator, 46, a first fixed attenuator, 47, a first low-pass filter, 48, a band-pass filter, 49, a second fixed attenuator, 410 and a second low-pass filter.
Detailed Description
As shown in figure 1, the utility model discloses an adopt constant power output amplifier of temperature compensating attenuator, including cavity 1, outer apron 2 and wire apron 3, still include microwave circuit board 4 and microwave apron 5, microwave circuit board 4 and microwave apron 5 set up in cavity 1. As shown in fig. 2, the microwave circuit board 4 includes an input isolator 41, a pre-amplifier 42, a power amplifier 43, and an output isolator 44 connected in this order, and a temperature-compensated attenuator 45 is provided between the pre-amplifier 42 and the power amplifier 43. The constant power output amplifier adopting the temperature compensating attenuator also comprises an SMA joint 6 and a feed-through capacitor 7, and the cavity 1 and the outer cover plate 2 are made of aluminum alloy materials; after debugging and testing are finished, the cavity 1 and the outer cover plate 2 are sealed in a laser welding mode. The wire cover plate 3 and the fixing screws are made of aluminum alloy materials and used for fixing internal wires to run. The microwave cover plate 5 and the fixing screws are made of aluminum alloy materials, and the microwave cover plate and the fixing screws are fixed by screws after debugging is completed. SMA connects 6 and set screw: and a signal input/output interface. The feedthrough capacitor 7 provides an external power interface, an internal power lead bonding location, and the like. The microwave cover 5 provides a stable microwave transmission environment. The outer cover plate 2 seals the whole amplifier by laser sealing welding.
The temperature compensation attenuator 45, i.e., T3, is HMTCA1803N9WB1J. The gain variation of the amplifier under the high and low temperature conditions is adjusted by mainly utilizing the inverse temperature characteristics (the attenuation is small under the high temperature and the attenuation is large under the low temperature) of the temperature compensation attenuator, so that the high and low temperature output power of the amplifier is adjusted, and the temperature stability index of the amplifier is met (the difference between the output power under the high temperature condition and the low temperature condition and the output power under the normal temperature is stable); the package structure is in a micro-assembly form.
The input isolator 41 is used for matching the output port of the signal source with the input port of a constant power output amplifier (amplifier for short) adopting a temperature compensation attenuator; preventing the amplifier signal from reflecting interfering with the signal source. The input isolator 41 adopts a WG902A12 chip U1, U1 radio frequency isolator, is a microwave ferrite device, signals pass through in one direction (1 enters 2 exits), and the reflected signals are absorbed by an absorption resistor, so that the purpose of preventing the signals from being back-connected to a signal source is achieved; the packaging structure adopts a micro-assembly form, and the input and output pins adopt a gold wire bonding process. The output isolator 44 is used to match the power amplifier 43 with the load, and the output isolator 44 uses the WG902a12 chip U5 to prevent the signal from being looped back to protect the power amplification.
The preamplifier 42 amplifies the signal source signal amplitude and drives the power amplifier 43. The preamplifier 42 adopts WFD085105-P19, the preamplifier 42 is used for amplifying an input signal and pushing the power amplifier 43 to work, the working voltage is single voltage, the packaging structure is in a micro-assembly form, and an input/output pin and a power-on pin both adopt a gold wire bonding process. The preamplifier 42 includes an amplifier Q2, a first inductor L1, a first capacitor C1, a second capacitor C2, and a third capacitor C3, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected in parallel between the 2 nd pin of the amplifier Q2 and ground, one end of the first inductor L1 is connected to the 2 nd pin of the amplifier Q2, and the other end of the first inductor L1 is connected to the drain voltage of the amplifier Q2.
As shown in fig. 3, the microwave circuit board 4 further includes a first fixed attenuator 46 and a first low-pass filter 47, the first fixed attenuator 46 is connected to the preamplifier 42, an input end of the first low-pass filter 47 is connected to the first fixed attenuator 46, and an output end of the first low-pass filter 47 is connected to the temperature compensation attenuator 45. The first fixed attenuator 46 is used to optimize the standing wave parameters at the output port of the preamplifier 42. The first low pass filter 47 is used to filter out harmonics from the output of the preamplifier 42. The first low pass filter 47 employs LFCN-123+. LFCN-123+ micro-assembly low pass filter LPF, small, mainly function to filter harmonic and high frequency stray signal that appear after preceding stage amplifier Q2 amplifies, after the signal that is processed enters the final power amplifier, has improved the amplification efficiency of amplifier, reduces the power consumption. (because the input signal passes through the input isolator U1, the band-pass filter U2 and the fixed attenuator T1, the main signal is relatively clean, the amplitude of the useful signal is amplified by a certain value after passing through the preamplifier Q2, and meanwhile, harmonic signals and spurious signals appear, and if the signals and the main signal are sent to the power amplifier without being processed, the harmonic and the spurious signals are further increased, the useful signal is relatively reduced, the amplification efficiency of the power amplifier Q1 is reduced, the power consumption is increased, and the deteriorated harmonic and spurious signals also interfere with other normally-operating devices.) the packaging structure mounting form. The first fixed attenuator 46 adopts a WSDG chip, and is used in an amplification link to play a role in adjusting the gain of the link and matching input and output impedance; the packaging structure adopts a micro-assembly form, and the input and output pins adopt a gold wire bonding process.
As shown in fig. 4, the input end of the temperature-compensating attenuator 45 is connected to the first low-pass filter 47 through a gold wire bonding wire, the output end of the temperature-compensating attenuator 45 is connected to the power amplifier 43 through a gold wire bonding wire, and the GND terminal of the temperature-compensating attenuator 45 is connected to the microwave circuit board 4 through a gold wire bonding wire. During design, planning a circuit board, and reserving the position of the temperature compensation attenuator 45; when a real object is debugged, the temperature compensation attenuator 45 is not added temporarily, the temperature compensation attenuator 45 with proper attenuation and adjustment is selected according to high-temperature, low-temperature and normal-temperature test data, the position of the temperature compensation attenuator 45 is cut off and reserved, a proper space is reserved, the temperature compensation attenuator 45 is assembled, the assembly mode adopts a micro-assembly mode, the lead of the input end and the output end adopts a gold wire bonding mode, and two 25 mu m gold wires are recommended for the input end and the output end; the chip GND pin of the temperature compensation attenuator 45 and the circuit board adopt a gold wire bonding mode, and the temperature compensation attenuator 45 is fixedly installed and bonded by conductive adhesive; the gap between the microstrip line and the product input and output electrode is less than or equal to 0.05mm; too long gold wire should not be used.
The microwave circuit board 4 further comprises a band-pass filter 48 and a second fixed attenuator 49, an input of the band-pass filter 48 is connected to an output of the input isolator 41, an input of the second fixed attenuator 49 is connected to an output of the band-pass filter 48, and an output of the second fixed attenuator 49 is connected to the preamplifier 42. The band pass filter 48 is used to filter out harmonics from the signal source. A second fixed attenuator 49 is used for impedance matching between the bandpass filter 48 and the preamplifier 42 to optimize the standing wave parameters. The bandpass filter 48 employs WLM080120. The WLM080120 micro-assembly band-pass filter BPF has small volume, allows useful signals in a bandwidth range, and filters out stray signals (two sides of a main signal) outside a band to ensure the purity of signals input to an amplifier. (because the spurious signal will reduce the power of the useful signal after passing through the amplifier, thereby reducing the amplification efficiency of the amplifier); the packaging structure adopts a micro-assembly form, and the input and output pins adopt a gold wire bonding process.
The microwave circuit board 4 further comprises a second low-pass filter 410, an input of the second low-pass filter 410 is connected to the power amplifier 43, and an output of the second low-pass filter 410 is connected to the output isolator 44. The second low pass filter 410 is used to filter out harmonics from the output of the power amplifier 43. The second low pass filter 410 also employs an LFCN-123+ chip.
The power amplifier 43 amplifies a signal input from the preamplifier, and outputs a power signal having a certain power value. The power amplifier 43 outputs open circuit protection. Outputting a signal with a certain power level; the package structure adopts a micro-assembly form, and the input/output pins and the power-on pins adopt a gold wire bonding process.
As shown in fig. 5, the power amplifier 43 includes an operational amplifier Q1, a first resistor R1, a second resistor R2, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a second inductor L2, and a third inductor L3, an output terminal of the operational amplifier Q1 is connected to an input terminal of the second low-pass filter 410, a1 st pin of the operational amplifier Q1 is connected to an output pin of the temperature compensation attenuator 45, a 3 rd pin of the operational amplifier Q1 is grounded, one end of the first resistor R1 is connected to a gate bias voltage of the operational amplifier Q1, the second resistor R2 and the fourth capacitor C4 are both connected in parallel between the other end of the first resistor R1 and ground, one end of the second inductor L2 is connected to the other end of the first resistor R1, the other end of the second inductor L2 is connected to a 4 th pin of the operational amplifier Q1, the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 are connected in parallel between a 5 th pin of the operational amplifier Q1 and ground, one end of the third inductor L3 is connected to a drain terminal of the operational amplifier Q1, and a drain terminal of the operational amplifier Q1 is connected to the drain terminal of the operational amplifier Q1. The operational amplifier Q1 adopts WFD080120-P37.
The temperature compensation attenuator 45 with negative temperature coefficient is adopted, bias voltage and control voltage are not needed, signal distortion is not generated, accurate response is realized to temperature change, and gain loss caused by temperature change in various amplifier applications can be effectively solved; the gain of the pre-amplifier is controlled under the conditions of high temperature and low temperature, and the output power of the power amplifier is further controlled; meanwhile, the temperature-compensated attenuator 45 is used between the pre-amplifier 42 and the power amplifier 43, so that impedance matching, intermodulation improvement, isolation and absorption of reflection caused by output mismatch of the power amplifier 43 can be achieved, and the pre-amplifier 42 is protected. An improvement in the temperature characteristic of the amplifier is achieved.
When in use, the utility model is used for cleaning the inner wall of the tank,
as shown IN fig. 6, at normal temperature, after a radio frequency signal output by a signal source passes through an input port (IN), the signal passes through an input isolator U1 first, a reflected signal is absorbed by the input isolator U1, after the signal passes through a band pass filter U2, an interference signal on both sides of a main signal is filtered, after the signal is adjusted IN size by a second fixed attenuator T2, the signal enters a preamplifier, a useful signal is amplified to a certain extent, and simultaneously a harmonic signal and a spurious signal also appear, at this time, after the main signal, the harmonic signal and the spurious signal pass through a first fixed attenuator T1, after the amplitude is adjusted by a first low pass filter U3, the harmonic signal and the spurious signal are basically filtered by a first low pass filter U3, the purity of the useful signal is improved, after the processed useful signal passes through a temperature compensation attenuator 45, the processed useful signal enters a power amplifier Q1, after the power amplifier further amplifies the input useful signal, the useful signal at this time becomes a useful signal with a certain power, at this time, the useful signal also appears, after the harmonic signal, the spurious signal passes through a second pass through a low pass filter U4, the remaining useful signal output isolator U5, and then can be sent out.
Under high temperature, the amplification gains of the amplifiers Q1 and Q2 are reduced, the input power is unchanged, the attenuation amounts of the first fixed attenuator T1 and the second fixed attenuator T2 are unchanged, and the output power is reduced after the temperature compensation attenuator T3 is replaced by the fixed attenuator; after the temperature compensation attenuator T3 is replaced at high temperature, the reverse temperature characteristic of the temperature compensation attenuator is utilized, at the moment, the attenuation quantity of the temperature compensation attenuator is reduced, and the attenuation of a link is reduced, so that the difference value between the output power and the output power at normal temperature is constant.
Under low temperature, the amplification gains of the amplifiers Q1 and Q2 are improved, the input power is unchanged, the attenuation amounts of the first fixed attenuator T1 and the second fixed attenuator T2 are unchanged, and the output power is increased after the temperature compensation attenuator T3 is replaced by the fixed attenuator; after the temperature compensation attenuator T3 is replaced at low temperature, the reverse temperature characteristic of the temperature compensation attenuator is utilized, the attenuation of the temperature compensation attenuator is increased, and the attenuation of a link is increased, so that the difference value between the output power and the output power at normal temperature is constant. The high and low temperature gains of the amplifier can be just balanced by using the temperature compensation attenuator, and finally, signals are stably output.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides an adopt constant power output amplifier of temperature compensating attenuator, includes cavity (1), outer apron (2) and wire apron (3), its characterized in that: the microwave circuit board (4) and the microwave cover plate (5) are arranged in the cavity (1), the microwave circuit board (4) comprises an input isolator (41), a pre-stage amplifier (42), a power amplifier (43) and an output isolator (44) which are sequentially connected, and a temperature compensation attenuator (45) is arranged between the pre-stage amplifier (42) and the power amplifier (43).
2. The constant power output amplifier adopting the temperature-compensated attenuator according to claim 1, wherein: the microwave circuit board (4) further comprises a first fixed attenuator (46) and a first low-pass filter (47), the first fixed attenuator (46) is connected with the preamplifier (42), the input end of the first low-pass filter (47) is connected with the first fixed attenuator (46), and the output end of the first low-pass filter (47) is connected with the temperature compensation attenuator (45).
3. The constant power output amplifier adopting the temperature-compensated attenuator as claimed in claim 2, wherein: the input end of the temperature compensation attenuator (45) is connected with the first low-pass filter (47) through a gold wire bonding lead, the output end of the temperature compensation attenuator (45) is connected with the power amplifier (43) through a gold wire bonding lead, and a GND pin of the temperature compensation attenuator (45) is connected to the microwave circuit board (4) through a gold wire bonding lead.
4. The constant power output amplifier adopting the temperature-compensated attenuator according to claim 3, wherein: the microwave circuit board (4) further comprises a band-pass filter (48) and a second fixed attenuator (49), the input end of the band-pass filter (48) is connected with the output end of the input isolator (41), the input end of the second fixed attenuator (49) is connected with the output end of the band-pass filter (48), and the output end of the second fixed attenuator (49) is connected with the preamplifier (42).
5. The constant power output amplifier adopting the temperature-compensated attenuator as claimed in claim 4, wherein: the microwave circuit board (4) further comprises a second low-pass filter (410), the input end of the second low-pass filter (410) is connected with the power amplifier (43), and the output end of the second low-pass filter (410) is connected with the output isolator (44).
6. The constant power output amplifier using the temperature-compensated attenuator of claim 5, wherein: the power amplifier (43) comprises an operational amplifier Q1, a first resistor R1, a second resistor R2, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a second inductor L2 and a third inductor L3, wherein the output end of the operational amplifier Q1 is connected with the input end of a second low-pass filter (410), the 1 st pin of the operational amplifier Q1 is connected with the output pin of a temperature compensation attenuator (45), the 3 rd pin of the operational amplifier Q1 is grounded, one end of the first resistor R1 is connected with the gate bias voltage of the operational amplifier Q1, the second resistor R2 and the fourth capacitor C4 are connected between the other end of the first resistor R1 and the ground in parallel, one end of the second inductor L2 is connected with the other end of the first resistor R1, the other end of the second inductor L2 is connected with the 4 th pin of the operational amplifier Q1, the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are connected between the 5 th pin of the operational amplifier Q1 and the ground in parallel, one end of the third inductor L3 is connected with the drain voltage of the operational amplifier Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223086036.5U CN218679007U (en) | 2022-11-21 | 2022-11-21 | Constant power output amplifier adopting temperature compensation attenuator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223086036.5U CN218679007U (en) | 2022-11-21 | 2022-11-21 | Constant power output amplifier adopting temperature compensation attenuator |
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| Publication Number | Publication Date |
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| CN218679007U true CN218679007U (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223086036.5U Active CN218679007U (en) | 2022-11-21 | 2022-11-21 | Constant power output amplifier adopting temperature compensation attenuator |
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