CN206993064U - The radio frequency attenuator of continuously adjustabe - Google Patents
The radio frequency attenuator of continuously adjustabe Download PDFInfo
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- CN206993064U CN206993064U CN201720756681.3U CN201720756681U CN206993064U CN 206993064 U CN206993064 U CN 206993064U CN 201720756681 U CN201720756681 U CN 201720756681U CN 206993064 U CN206993064 U CN 206993064U
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- pin diode
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Abstract
It the utility model is related to the radio frequency attenuator technology of continuously adjustabe.The utility model solves current PIN diode attenuator while attenuation change is adjusted, and can make standing wave change very greatly, the problem of influenceing other indexs such as gain fluctuation, it is proposed that a kind of radio frequency attenuator of continuously adjustabe, its technical scheme can be summarized as：Including the first electric capacity, the second electric capacity, PIN diode attenuator circuit and 3dB electric bridges, wherein a sub-signal end of 3dB electric bridges input signal is connected by the first electric capacity with a feed leg input of PIN diode attenuator circuit, and another sub-signal end of 3dB electric bridge input signals is connected by the second electric capacity with another feed leg input of PIN diode attenuator circuit.The beneficial effects of the utility model are, link attenuation value size can be adjusted, while can be kept approximately constant its input and output standing wave, so as to not interfere with the matching of the RF impedance in link, other indexs of radio-frequency power amplifier are not influenceed, suitable for radio-frequency power amplifier.
Description
Technical field
It the utility model is related to the radio frequency attenuator technology of attenuator technology, more particularly to continuously adjustabe.
Background technology
Attenuator can be usually used to adjust link gain in radio-frequency power amplifier module design, its common design form
For：
1. π types decay.Its attenuation is fixed.Its advantage is that circuit is simple (only 3 resistance), but its pad value
It is fixed, when discovery module link gain is too high or too low, it is necessary to employ flatiron to change resistance.This mode is in radio frequency
When power amplifier module is produced in enormous quantities, modular debugging efficiency is low, and rosin joint is easily caused in Renewal process.π types decline
Subtract when radio-frequency power amplifier module is produced in enormous quantities, modular debugging efficiency is low, and void is easily caused in Renewal process
Weldering.
2.PIN diodes are decayed.It is one PIN diode of series connection in radio frequency link, by adjusting the PIN diode
The conversion that PIN diode equivalent resistance is realized by electric current.But this regulative mode is while attenuation changes, standing wave
Change is very big, influences other indexs such as gain fluctuation.PIN diode is decayed while regulative mode changes in attenuation, is stayed
Ripple changes very greatly, influences other indexs such as gain fluctuation.
Utility model content
The purpose of this utility model provides a kind of radio frequency attenuator of continuously adjustabe, solves current PIN diode attenuator
While attenuation change is adjusted, standing wave change can be made very greatly, the problem of influenceing other indexs such as gain fluctuation.
The utility model solves its technical problem, and the technical scheme of use is：The radio frequency attenuator of continuously adjustabe, including the
One electric capacity, the second electric capacity and PIN diode attenuator circuit, it is characterised in that also including 3dB electric bridges, the 3dB electric bridges input letter
Number a sub-signal end be connected by the first electric capacity with a feed leg input of PIN diode attenuator circuit, 3dB electricity
Another sub-signal end of bridge input signal is inputted by another feed leg of the second electric capacity and PIN diode attenuator circuit
End connection.
It is further that the PIN diode attenuator circuit includes the first inductance, the second inductance, first resistor, the second electricity
Resistance, potentiometer, the first PIN diode, the second PIN diode, direct-current input power supplying and ground wire, first PIN diode
Anode is connected with one end of the first electric capacity, and the negative electrode of the first PIN diode is connected by first resistor with ground wire, the first inductance
One end is connected with the anode of the first PIN diode, the connection of the sliding end of the other end and potentiometer, a fixing end of potentiometer with
Direct-current input power supplying is connected, and another fixing end is connected with ground wire, and one end of the second inductance and the sliding end of potentiometer connect, separately
One end is connected with the anode of the second PIN diode, and the anode of the second PIN diode is connected with one end of the second electric capacity, the 2nd PIN
The negative electrode of diode is connected by second resistance with ground wire.
It is further that the resistance of the first resistor is 100 ohm, the resistance of second resistance is 100 ohm, potentiometer
Maximum value be 1000 ohm.
It is further that the resistance of the first resistor is 50 ohm, the resistance of second resistance is 50 ohm, potentiometer
Maximum value is 1000 ohm.
It is further that the direct-current input power supplying is 5V direct-current input power supplyings.
The beneficial effects of the utility model are, by the radio frequency attenuator of above-mentioned continuously adjustabe, can to adjust link attenuation
It is worth size, while can be kept approximately constant its input and output standing wave, so as to does not interfere with the RF impedance in link
Match somebody with somebody, do not influence other indexs of radio-frequency power amplifier.
Brief description of the drawings
Fig. 1 is embodiment circuit structure diagram.
Wherein R1 is first resistor, and R2 is second resistance, and R3 is potentiometer, and D1 is the first PIN diode, D2 second
PIN diode, L1 are the first inductance, and L2 is the second inductance, and C1 is the first electric capacity, and C2 is the second electric capacity, and VCC is direct current input electricity
Source, IN be 3dB electric bridges input, ISO be 3dB electric bridges output end, 0 ° be 3dB electric bridge input signals a sub-signal
End, -90 ° of another sub-signal ends for 3dB electric bridge input signals.
Embodiment
Below in conjunction with the accompanying drawings and embodiment, the technical solution of the utility model is described in detail.
The radio frequency attenuator of continuously adjustabe described in the utility model is decayed electric by the first electric capacity, the second electric capacity, PIN diode
Road and 3dB electric bridges composition, wherein, a sub-signal end of 3dB electric bridge input signals is declined by the first electric capacity with PIN diode
One feed leg input connection on powered down road, another sub-signal ends of 3dB electric bridge input signals by the second electric capacity with
Another feed leg input connection of PIN diode attenuator circuit.
Embodiment
The radio frequency attenuator of the present embodiment continuously adjustabe includes the first electric capacity C1, the second electric capacity C2, PIN diode decay electricity
Road and 3dB electric bridges, its circuit structure diagram referring to Fig. 1, wherein, 0 ° of a sub-signal end for 3dB electric bridge input signals passes through first
Electric capacity C1 is connected with a feed leg input of PIN diode attenuator circuit, another point of letter of 3dB electric bridge input signals
Number end -90 ° be connected by the second electric capacity C2 with another feed leg input of PIN diode attenuator circuit, input signal
Inputted from the input IN of 3dB electric bridges, output signal exports from the output end ISO of 3dB electric bridges.
In foregoing circuit, PIN diode attenuator circuit includes the first inductance L1, the second inductance L2, first resistor R1, second
Resistance R2, potentiometer R3, the first PIN diode D1, the second PIN diode D2, direct-current input power supplying VCC and ground wire, wherein, the
One PIN diode D1 anode is connected with the first electric capacity C1 one end, and the first PIN diode D1 negative electrode passes through first resistor R1
It is connected with ground wire, the first inductance L1 one end is connected with the first PIN diode D1 anode, the slip of the other end and potentiometer R3
End connection, a potentiometer R3 fixing end are connected with direct-current input power supplying VCC, and another fixing end is connected with ground wire, and second
Inductance L2 one end is connected with potentiometer R3 sliding end, and the other end is connected with the second PIN diode D2 anode, the 2nd PIN
Diode D2 anode is connected with the second electric capacity C2 one end, and the second PIN diode D2 negative electrode passes through second resistance R2 and ground
Line connects.
In this example, first resistor R1 resistance is 100 ohm, and second resistance R2 resistance is 100 ohm, potentiometer R3's
Maximum value is 1000 ohm, and direct-current input power supplying is 5V direct-current input power supplyings.
In practical application, using the radio frequency attenuator of the present embodiment continuously adjustabe, following effect can reach：
Changed by the voltage for adjusting potentiometer R3 its sliding end between 0V~5V, the voltage of sliding end passes through
One inductance L1 influences the change of the first PIN diode D1 conducting electric current, influences the second PIN diode D2 by the second inductance L2
Conducting electric current change.When the voltage of potentiometer R3 sliding end rises, the electricity by the first PIN diode D1 can be caused
Rheology is big, the first PIN diode D1 equivalent resistance is diminished, and becomes big by the second PIN diode D2 electric current, makes second
PIN diode D2 equivalent resistance diminishes；Conversely, when the voltage of potentiometer R3 sliding end declines, can cause by first
PIN diode D1 electric current diminishes, and makes the first PIN diode D1 equivalent electric resistive big, passes through the second PIN diode D2 electricity
Rheology is small, makes the second PIN diode D2 equivalent electric resistive big.
When the first PIN diode D1 equivalent resistance in 100 ohm and the second PIN diode D2 of equivalent resistance 100
During ohm, test to obtain through oscillograph, the attenuation of input signal is 10dB, the input IN's and output end ISO of 3dB electric bridges
Standing wave is -30dB, and now the input IN and output end ISO of 3dB electric bridges standing wave are indicated that at standing wave below -15dB
In extraordinary state.
When the first PIN diode D1 equivalent resistance in 300 ohm and the second PIN diode D2 of equivalent resistance 300
During ohm, test to obtain through oscillograph, the attenuation of input signal is 3.4dB, the input IN and output end ISO of 3dB electric bridges
Standing wave be -24dB, now the input IN and output end ISO of 3dB electric bridges standing wave indicate that standing wave below -20dB
It is in extraordinary state.
When the first PIN diode D1 equivalent resistance exists in the equivalent resistance of 10000 ohm and the second PIN diode D2
At 10000 ohm, test to obtain through oscillograph, the attenuation of input signal is 0.5dB, the input IN of 3dB electric bridges and output
Hold ISO standing wave be -21dB, now the input IN and output end ISO of 3dB electric bridges standing wave below -20dB with regard to table
Bright standing wave is in extraordinary state.
The equivalent resistance of the above-mentioned equivalent resistance for working as the first PIN diode D1 and the second PIN diode D2 is in excursion
During interior change, the attenuation excursion of input signal is 10dB~0.5dB, the input IN's and output end ISO of 3dB electric bridges
Standing wave is held in below -20dB, i.e., standing wave is always in preferable matching status.
Claims (5)
1. the radio frequency attenuator of continuously adjustabe, including the first electric capacity, the second electric capacity and PIN diode attenuator circuit, its feature exist
In in addition to 3dB electric bridges, a sub-signal end of the 3dB electric bridges input signal passes through the first electric capacity and decayed with PIN diode
The feed leg input connection of circuit, another sub-signal end of 3dB electric bridge input signals passes through the second electric capacity and PIN
Another feed leg input connection of diode attenuator circuit.
2. the radio frequency attenuator of continuously adjustabe according to claim 1, it is characterised in that the PIN diode decay electricity
Road include the first inductance, the second inductance, first resistor, second resistance, potentiometer, the first PIN diode, the second PIN diode,
Direct-current input power supplying and ground wire, the anode of first PIN diode are connected with one end of the first electric capacity, the first PIN diode
Negative electrode be connected by first resistor with ground wire, one end of the first inductance is connected with the anode of the first PIN diode, the other end with
The sliding end connection of potentiometer, a fixing end of potentiometer are connected with direct-current input power supplying, and another fixing end connects with ground wire
Connect, one end of the second inductance and the sliding end of potentiometer are connected, and the other end is connected with the anode of the second PIN diode, the 2nd PIN
The anode of diode is connected with one end of the second electric capacity, and the negative electrode of the second PIN diode is connected by second resistance with ground wire.
3. the radio frequency attenuator of continuously adjustabe according to claim 2, it is characterised in that the resistance of the first resistor is
100 ohm, the resistance of second resistance is 100 ohm, and the maximum value of potentiometer is 1000 ohm.
4. the radio frequency attenuator of continuously adjustabe according to claim 2, it is characterised in that the resistance of the first resistor is
50 ohm, the resistance of second resistance is 50 ohm, and the maximum value of potentiometer is 1000 ohm.
5. the radio frequency attenuator of the continuously adjustabe according to claim 3 or 4, it is characterised in that the direct-current input power supplying
For 5V direct-current input power supplyings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720756681.3U CN206993064U (en) | 2017-06-27 | 2017-06-27 | The radio frequency attenuator of continuously adjustabe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720756681.3U CN206993064U (en) | 2017-06-27 | 2017-06-27 | The radio frequency attenuator of continuously adjustabe |
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| Publication Number | Publication Date |
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| CN206993064U true CN206993064U (en) | 2018-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720756681.3U Active CN206993064U (en) | 2017-06-27 | 2017-06-27 | The radio frequency attenuator of continuously adjustabe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737705A (en) * | 2020-12-29 | 2021-04-30 | 京信网络系统股份有限公司 | Automatic electronic tuning device and automatic electronic tuning method for standing-wave ratio |
-
2017
- 2017-06-27 CN CN201720756681.3U patent/CN206993064U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737705A (en) * | 2020-12-29 | 2021-04-30 | 京信网络系统股份有限公司 | Automatic electronic tuning device and automatic electronic tuning method for standing-wave ratio |
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