CN216851910U - Radio frequency amplifying circuit with adjustable output power - Google Patents
Radio frequency amplifying circuit with adjustable output power Download PDFInfo
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- CN216851910U CN216851910U CN202122828573.1U CN202122828573U CN216851910U CN 216851910 U CN216851910 U CN 216851910U CN 202122828573 U CN202122828573 U CN 202122828573U CN 216851910 U CN216851910 U CN 216851910U
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- radio frequency
- voltage
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- amplifier
- potentiometer
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 14
- 230000003321 amplification Effects 0.000 claims abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 16
- 239000003381 stabilizer Substances 0.000 claims description 14
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The utility model belongs to the technical field of analog signal processing, and particularly relates to a radio frequency amplification circuit with adjustable output power. The utility model adopts a wide voltage radio frequency amplifier PHA-101+ to build a radio frequency amplifying circuit, adopts a low dropout linear voltage regulator LT1963AEQ and a high-precision potentiometer 3296W to build a voltage stabilizing circuit with adjustable output voltage, and supplies power for the radio frequency amplifying circuit. The output voltage of the voltage stabilizing circuit is adjusted by adjusting the resistance value of the potentiometer, so that the output power of the radio frequency amplifying circuit is adjusted.
Description
Technical Field
The utility model belongs to the technical field of analog signal processing, and particularly relates to a radio frequency amplification circuit with adjustable output power.
Background
In the radio frequency circuit, since impedance matching of the output terminal needs to be considered, it is troublesome to adjust the output power. When the output power needs to be adjusted, the available schemes are generally a numerical control attenuator, a variable gain amplifier and a voltage control attenuator. The digital control attenuator and the variable gain amplifier are both digitally controlled, the output power is regulated in a stepping mode instead of continuously variable mode, and the stepping is generally 1 dB. The voltage-controlled attenuator can realize continuously variable output power adjustment, but the attenuation amount is large, so that the voltage-controlled attenuator is not suitable for small-range power adjustment. And the impedance matching of the radio frequency amplifying circuit can be changed by adopting a common amplifying circuit.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a radio frequency amplifying circuit with adjustable output power and an implementation method thereof. The utility model realizes the adjustment of the output power of the radio frequency amplifying circuit by adjusting the voltage adjustable linear voltage stabilizing circuit without changing the impedance matching of the radio frequency amplifying circuit.
The technical scheme of the utility model is as follows: the radio frequency amplification circuit with adjustable output power comprises a voltage-adjustable linear voltage stabilizing circuit and a radio frequency amplification circuit, wherein the output of the voltage-adjustable linear voltage stabilizing circuit is connected with the radio frequency amplification circuit; the method is characterized in that: the voltage-adjustable linear voltage stabilizing circuit comprises a voltage stabilizer U2, a first resistor R1, a second resistor R2 and a potentiometer RP1, wherein a potentiometer RP1 and a second resistor R2 are connected in parallel between an output end OUT of the voltage stabilizer U2 and a reference end ADJ, the second resistor R2 is connected with a sliding end of the potentiometer RP1, and the size of a connection resistance value of the potentiometer RP1 can be changed by adjusting the sliding end; reference terminal ADJ of voltage regulator U2 is connected to ground through a first resistor R1, and input terminal VIN and enable terminal EN of voltage regulator U2 are connected to an input dc power supply. An output end OUT of the voltage stabilizer U2 is connected with the third capacitor C3 and the fourth capacitor C4, and an input end VIN of the voltage stabilizer U2 is connected with the fifth capacitor C5 and the sixth capacitor C6.
According to the radio frequency amplifying circuit with adjustable output power, the radio frequency amplifying circuit is characterized in that: regulator U2 is a low dropout linear regulator LT1963 AEQ.
According to the radio frequency amplifying circuit with adjustable output power, the radio frequency amplifying circuit is characterized in that: the resistance of the first resistor R1 is 2.7k Ω, the resistance of the second resistor R2 is 8.2k Ω, and the maximum resistance of the potentiometer RP1 is 10k Ω.
According to the radio frequency amplifying circuit with adjustable output power, the radio frequency amplifying circuit is characterized in that: the radio frequency amplification circuit is connected in sequence by a first DC blocking capacitor C1, a radio frequency amplifier U1 and a second DC blocking capacitor C2. One end of the inductor L1 is connected with the output of the radio frequency amplifier U1, and the other end of the inductor L1 is connected with the output end OUT of the voltage stabilizer U2.
The radio frequency amplifying circuit with adjustable output power is characterized in that: the radio frequency amplifier U1 is a wide voltage radio frequency amplifier PHA-101+ device.
The utility model has the beneficial effects that: by adjusting the voltage, the output power of the radio frequency amplifying circuit can be continuously adjusted within +/-2.5 dB under the condition of not changing the impedance matching of the output end.
Drawings
Fig. 1 is a schematic block diagram of a radio frequency amplification circuit of the present invention.
Fig. 2 is a circuit diagram of the rf amplifying circuit according to the present invention.
Detailed Description
The technical scheme of the utility model is further explained by combining the attached drawings.
As shown in fig. 1, an rf amplifier circuit with adjustable output power includes a voltage-adjustable linear voltage regulator circuit and an rf amplifier circuit. The output of the voltage-adjustable linear voltage stabilizing circuit is connected with the radio frequency amplifying circuit.
As shown in FIG. 2, the RF amplifying circuit of the present invention is sequentially connected by a first DC blocking capacitor C1, an RF amplifier U1, and a second DC blocking capacitor C2, and the RF amplifier U1 may be a wide voltage RF amplifier PHA-101+ device. When the radio frequency input circuit works, a radio frequency input signal is input through the first blocking capacitor C1, amplified through the radio frequency amplifier U1 and output through the second blocking capacitor C2. The dc power supply for the rf amplifier U1 is provided by a tunable linear voltage regulator circuit. The operating band of the radio frequency amplifier U1 is 50 MHz-1500 MHz, the typical gain value is 15dB, and the typical 1dB saturated output power value is 26 dBm. By adjusting the power to the rf amplifier U1, its output power can be adjusted.
As shown in fig. 2, the voltage-adjustable linear voltage stabilizing circuit of the present invention includes a voltage regulator U2 and an inductor L1, one end of the inductor L1 is connected to the output of the rf amplifier U1, the other end of the one end of the inductor L1 is connected to the output terminal OUT of the voltage regulator U2, a potentiometer RP1 and a second resistor R2 are connected in parallel between the output terminal OUT of the voltage regulator U2 and the reference terminal ADJ, the second resistor R2 is connected to the sliding end of the potentiometer RP1, and the magnitude of the access resistance of the potentiometer RP1 can be changed by moving the sliding end; reference terminal ADJ of voltage regulator U2 is connected to ground through a first resistor R1, and input terminal VIN and enable terminal EN of voltage regulator U2 are connected to an input dc power supply. An output end OUT of the voltage stabilizer U2 is connected with the third capacitor C3 and the fourth capacitor C4, and an input end VIN of the voltage stabilizer U2 is connected with the fifth capacitor C5 and the sixth capacitor C6.
Regulator U2 of the present invention may be a low dropout linear regulator LT1963 AEQ. In the utility model, the resistance value of the first resistor R1 is 2.7k omega, the resistance value of the second resistor R2 is 8.2k omega, and the maximum resistance value of the potentiometer RP1 is 10k omega. When the resistance value of the potentiometer is adjusted to 0, the output voltage of the voltage stabilizing circuit is about 4.88V. When the resistance value of the potentiometer is adjusted to the maximum value, the voltage stabilizing circuit outputs about 9.36V of voltage.
The resistance value of the potentiometer is set to the position of a middle point 5k omega in the initial state, and the adjustable range of the output voltage of the adjustable linear voltage stabilizing circuit is 7.12V +/-2.24V. Through practical tests, under the state of saturated amplification, the change rate of the radio frequency output power along with the voltage is about 1.1 dB/V. The power adjustable range of the rf amplifying circuit is about ± 2.5dB without changing the impedance matching of the output terminal by adjusting the voltage. The circuit and the method are suitable for the output end of the radio frequency amplifying circuit with the working frequency range of 50 MHz-1500 MHz.
Claims (5)
1. The radio frequency amplification circuit with adjustable output power comprises a voltage-adjustable linear voltage stabilizing circuit and a radio frequency amplification circuit, wherein the output of the voltage-adjustable linear voltage stabilizing circuit is connected with the radio frequency amplification circuit; the method is characterized in that: the voltage-adjustable linear voltage stabilizing circuit comprises a voltage stabilizer U2, a first resistor R1, a second resistor R2 and a potentiometer RP1, wherein a potentiometer RP1 and a second resistor R2 are connected in parallel between an output end OUT of the voltage stabilizer U2 and a reference end ADJ, the second resistor R2 is connected with a sliding end of the potentiometer RP1, and the size of a connection resistance value of the potentiometer RP1 can be changed by adjusting the sliding end; reference end ADJ of voltage stabilizer U2 is connected with ground through first resistance R1, and input VIN, enable end EN of voltage stabilizer U2 are connected with input DC power supply, and output OUT of voltage stabilizer U2 is connected with third electric capacity C3 and fourth electric capacity C4, and input VIN of voltage stabilizer U2 is connected with fifth electric capacity C5 and sixth electric capacity C6.
2. The rf amplifier circuit of claim 1, wherein: regulator U2 is a low dropout linear regulator LT1963 AEQ.
3. The rf amplifier circuit of claim 1, wherein: the resistance of the first resistor R1 is 2.7k Ω, the resistance of the second resistor R2 is 8.2k Ω, and the maximum resistance of the potentiometer RP1 is 10k Ω.
4. The rf amplifier circuit of claim 1, wherein: the radio frequency amplification circuit is sequentially connected with a first blocking capacitor C1, a radio frequency amplifier U1 and a second blocking capacitor C2, one end of an inductor L1 is connected with the output end of the radio frequency amplifier U1, and the other end of the inductor L1 is connected with the output end OUT of a voltage stabilizer U2.
5. The rf amplifier circuit with adjustable output power of claim 4, wherein: the RF amplifier U1 is a wide voltage RF amplifier PHA-101+ device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122828573.1U CN216851910U (en) | 2021-11-18 | 2021-11-18 | Radio frequency amplifying circuit with adjustable output power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122828573.1U CN216851910U (en) | 2021-11-18 | 2021-11-18 | Radio frequency amplifying circuit with adjustable output power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216851910U true CN216851910U (en) | 2022-06-28 |
Family
ID=82102190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122828573.1U Expired - Fee Related CN216851910U (en) | 2021-11-18 | 2021-11-18 | Radio frequency amplifying circuit with adjustable output power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216851910U (en) |
-
2021
- 2021-11-18 CN CN202122828573.1U patent/CN216851910U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220628 |