CN220421777U - Frequency doubling circuit - Google Patents
Frequency doubling circuit Download PDFInfo
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- CN220421777U CN220421777U CN202321812743.XU CN202321812743U CN220421777U CN 220421777 U CN220421777 U CN 220421777U CN 202321812743 U CN202321812743 U CN 202321812743U CN 220421777 U CN220421777 U CN 220421777U
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- capacitor
- amplifier
- mixer
- frequency doubling
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- 239000003990 capacitor Substances 0.000 claims abstract description 34
- 230000001629 suppression Effects 0.000 abstract description 5
- 230000010355 oscillation Effects 0.000 abstract description 3
- 230000000452 restraining effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
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Abstract
The utility model relates to a frequency doubling circuit, which comprises an attenuator B1, wherein the input end of the attenuator B1 is connected with a microwave signal RFin, the output end of the attenuator B is respectively connected with an RF end and an IF end of a mixer U1, the LO end of the mixer U1 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the input end of an amplifier T1, the output end of the amplifier T1 is connected with one end of a capacitor C3, the other end of the capacitor C3 is connected with the input end of a band-pass filter F1, and the output end of the band-pass filter F1 is used as an output signal of the microwave signal to be RFout; the amplifier T1 is powered by a bias circuit. According to the utility model, the RF port of the mixer U1 is directly connected with the IF port, so that the frequency doubling function is realized, an amplifier connected with the LO port of the mixer U1 and used for providing local oscillation power can be saved, and the circuit is simple and easy to realize; the method can obtain a more stable and single frequency doubling signal, and the out-of-band suppression requirement of the band-pass filter F1 is easier to realize during frequency doubling, and the harmonic suppression is high.
Description
Technical Field
The utility model relates to the technical field of frequency doubling circuits, in particular to a frequency doubling circuit.
Background
The frequency doubling circuit is a basic and important microwave circuit and is used for amplifying the frequency of a microwave input signal into integer multiples so as to improve the frequency. The frequency doubling circuit is widely applied to the fields of radar microwave systems, radio communication and the like.
The frequency doubling modes commonly used at present are as follows: firstly, a microwave input signal is directly input into a frequency multiplier by using an existing frequency multiplier device, and the frequency of the microwave input signal is amplified by integer times by the frequency multiplier, and the frequency multiplication mode is simple in circuit, but an output signal is unstable and harmonic interference is easy to generate; secondly, the phase-locked loop is utilized to respectively input the microwave input signal and the reference signal into the phase-locked loop, a frequency divider is arranged in the phase-locked loop, and the frequency of the microwave input signal is amplified by a feedback mechanism of the phase-locked loop and changing the frequency division times. Therefore, how to develop a frequency doubling circuit with easy implementation, stable output signal and high harmonic suppression has become a technical problem to be solved.
Disclosure of Invention
In order to solve the problems of unstable output signals and complex circuits of the existing frequency doubling circuits and difficult realization, the utility model aims to provide a frequency doubling circuit which is simple and easy to realize, stable in output signals and high in harmonic suppression.
In order to achieve the above purpose, the present utility model adopts the following technical scheme: the frequency doubling circuit comprises an attenuator B1, wherein the input end of the attenuator B1 is connected with a microwave signal RFin, the output end of the attenuator B is respectively connected with an RF end and an IF end of a mixer U1, the LO end of the mixer U1 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the input end of an amplifier T1, the output end of the amplifier T1 is connected with one end of a capacitor C3, the other end of the capacitor C3 is connected with the input end of a band-pass filter F1, and the output end of the band-pass filter F1 is used as an output signal of the microwave signal RFout; the amplifier T1 is powered by a bias circuit.
The bias circuit comprises a capacitor C1, a resistor R1, a capacitor C4 and an inductor L1, wherein one end of the capacitor C1 and one end of the resistor R1 are both connected with a voltage VCC, the other end of the capacitor C1 is grounded, the other end of the resistor R1 is respectively connected with one end of the capacitor C4 and one end of the inductor L1, the other end of the inductor L1 is connected with the output end of the amplifier T1, and the other end of the capacitor C4 is grounded.
According to the technical scheme, the beneficial effects of the utility model are as follows: firstly, the RF port of the mixer U1 is directly connected with the IF port, so that the signal frequency output by the LO port of the mixer U1 is the sum of the signal frequencies of the RF port and the IF port, namely, the signal frequency of the RF port is doubled, and the double frequency function is realized; the RF port of the mixer U1 is reversely used with the LO port, so that an amplifier connected with the LO port of the mixer U1 and used for providing local oscillation power can be saved, and the circuit is simple and easy to realize; secondly, the LO port signal of the mixer U1 amplifies power through the amplifier T1, and then the combined component except the frequency doubling signal is restrained through the band-pass filter F1, so that a more stable and single frequency doubling signal can be obtained, and when frequency doubling is carried out, the out-of-band restraining requirement of the band-pass filter F1 is easier to realize, and the harmonic suppression is high; third, the utility model can realize higher frequency multiplication through cascade, for example, 4 times multiplication, and two cascade of the utility model can be used.
Drawings
Fig. 1 is a schematic circuit diagram of the present utility model.
Detailed Description
As shown in fig. 1, a frequency doubling circuit includes an attenuator B1, the input end of which is connected to a microwave signal RFin, the output end of which is connected to an RF end and an IF end of a mixer U1, the LO end of the mixer U1 is connected to one end of a capacitor C2, the other end of the capacitor C2 is connected to an input end of an amplifier T1, the output end of the amplifier T1 is connected to one end of a capacitor C3, the other end of the capacitor C3 is connected to an input end of a band-pass filter F1, and the output end of the band-pass filter F1 outputs a signal RFout as a microwave signal output end; the amplifier T1 is powered by a bias circuit 1. The RF end is a radio frequency end, the LO end is a local oscillator end, and the IF end is an intermediate frequency end.
The bias circuit 1 comprises a capacitor C1, a resistor R1, a capacitor C4 and an inductor L1, wherein one end of the capacitor C1 and one end of the resistor R1 are both connected with a voltage VCC, the other end of the capacitor C1 is grounded, the other end of the resistor R1 is respectively connected with one end of the capacitor C4 and one end of the inductor L1, the other end of the inductor L1 is connected with the output end of the amplifier T1, and the other end of the capacitor C4 is grounded.
In summary, the RF port of the mixer U1 is directly connected to the IF port, so that the signal frequency output by the LO port of the mixer U1 is the sum of the signal frequencies of the two ports, namely, the RF port signal frequency is twice, and the frequency doubling function is realized; the RF port of the mixer U1 is reversely used with the LO port, so that an amplifier connected with the LO port of the mixer U1 and used for providing local oscillation power can be saved, and the circuit is simple and easy to realize; the LO port signal of the mixer U1 amplifies power through the amplifier T1, and then the combined components except the frequency doubling signal are restrained through the band-pass filter F1, so that a more stable and single frequency doubling signal can be obtained, and when the frequency doubling is carried out, the out-of-band restraining requirement of the band-pass filter F1 is easier to realize, and the harmonic restraining is high; the utility model can realize higher frequency multiplication through cascade, for example, 4 times multiplication, and two cascade of the utility model can be used.
Claims (2)
1. A frequency doubling circuit, characterized by: the microwave frequency mixer comprises an attenuator B1, wherein the input end of the attenuator B1 is connected with a microwave signal RFin, the output end of the attenuator B is respectively connected with an RF end and an IF end of a mixer U1, the LO end of the mixer U1 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the input end of an amplifier T1, the output end of the amplifier T1 is connected with one end of a capacitor C3, the other end of the capacitor C3 is connected with the input end of a band-pass filter F1, and the output end of the band-pass filter F1 is used as an output signal of the microwave signal RFout; the amplifier T1 is powered by a bias circuit (1).
2. The frequency doubling circuit of claim 1, wherein: the bias circuit (1) comprises a capacitor C1, a resistor R1, a capacitor C4 and an inductor L1, wherein one end of the capacitor C1 and one end of the resistor R1 are both connected with a voltage VCC, the other end of the capacitor C1 is grounded, the other end of the resistor R1 is respectively connected with one end of the capacitor C4 and one end of the inductor L1, the other end of the inductor L1 is connected with the output end of the amplifier T1, and the other end of the capacitor C4 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321812743.XU CN220421777U (en) | 2023-07-11 | 2023-07-11 | Frequency doubling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321812743.XU CN220421777U (en) | 2023-07-11 | 2023-07-11 | Frequency doubling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220421777U true CN220421777U (en) | 2024-01-30 |
Family
ID=89651852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321812743.XU Active CN220421777U (en) | 2023-07-11 | 2023-07-11 | Frequency doubling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220421777U (en) |
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2023
- 2023-07-11 CN CN202321812743.XU patent/CN220421777U/en active Active
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