CN220732740U - Intermediate frequency signal filtering processing circuit - Google Patents
Intermediate frequency signal filtering processing circuit Download PDFInfo
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- CN220732740U CN220732740U CN202322141324.4U CN202322141324U CN220732740U CN 220732740 U CN220732740 U CN 220732740U CN 202322141324 U CN202322141324 U CN 202322141324U CN 220732740 U CN220732740 U CN 220732740U
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Abstract
The utility model relates to an intermediate frequency signal filtering processing circuit, which comprises a first single-ended signal conversion circuit, wherein the first single-ended signal conversion circuit comprises a first transformer, a pin 1 of the first transformer is grounded through a resistor R10, a pin 3 is connected with a signal through a resistor R28, a pin 4 is connected with one end of a resistor R26, a resistor R91 is connected with a resistor R34 in series and then is connected between the resistor R28 and the resistor R26, and a resistor R26 is connected with a differential signal amplifying module in series with a resistor R27 and a capacitor C16. The design reliably promotes the wanted signal, reduces the signal noise and avoids the signal distortion.
Description
Technical Field
The utility model relates to the technical field of radar signal processing circuits, in particular to an intermediate frequency signal filtering processing circuit.
Background
The radar TR component consists of a transmitter part and a receiver part, and realizes the emission of a sweep frequency continuous wave signal, the reception of an echo signal and IQ demodulation, wherein the receiver part has the functions of completing the power amplification (LNA, radio frequency amplification and intermediate frequency amplification), frequency conversion (down conversion), filtering treatment and the like of the signal. The microwave is a transmission signal working in a certain frequency band, and because of the characteristics of microwave transmission and the curved surface characteristics of the earth, a microwave line is generally formed by one section, each section can be regarded as a point-to-point wireless communication system, the microwave communication transmission information quantity is very high, and the fading caused by the multipath transmission of the ground and the atmosphere can lead to the uneven and distorted signal transmission, so that the utilization rate of the bandwidth of the subsequent signal in the modulation process is low and the noise is strong, therefore, the power amplification (LNA, radio frequency amplification, intermediate frequency amplification), frequency conversion (down conversion), filtering treatment and the like of the echo signal need to be completed when the subsequent signal is received, the indexes of the current processing signal do not reach the standard, the output signal is easy to distort, and the noise rejection is poor, thus the improvement is needed.
Disclosure of Invention
In view of the above, it is necessary to provide an intermediate frequency signal filtering processing circuit.
The intermediate frequency signal filtering processing circuit comprises a first single-ended signal conversion circuit, a second single-ended signal conversion circuit, a differential signal amplification module and a low-pass filtering amplification module, wherein the first band-pass filtering module and the second band-pass filtering module are connected with the output end of the first single-ended signal conversion circuit and the output end of the second single-ended signal conversion circuit respectively, the two output pins of the differential signal amplification module are connected with the input pins of the low-pass filtering amplification module, the output pins of the low-pass filtering amplification module are respectively connected with the output ends of the first band-pass filtering module and the second band-pass filtering module, the first single-ended signal conversion circuit comprises a first transformer U1, the 1 pin of the first transformer U1 is grounded through a resistor R10, the 2 pin is connected with signals through a resistor R28, the 4 pin is connected with one end of a resistor R26, after the resistors R91 and R34 are connected in series, the other end of the resistor R26 is connected between the resistor R28 and the resistor R26, the other end of the resistor R26 is connected with the input pin of the differential signal amplification module 3 through a resistor R27 and a capacitor C16, the output pin of the low-pass filtering amplification module is respectively, the first single-ended signal conversion circuit comprises a first transformer U1 pin, the 1 pin is grounded through a resistor R10, the 2 pin 1 pin is connected with the resistor R4 and the other end of the resistor R4 is connected with the resistor R4 through a resistor R14 and the resistor R11 in series, the resistor R4 through the resistor R4 and the resistor C4.
Preferably, the model of the first transformer U1 is ADT8-1T+.
Preferably, the differential signal amplifying module includes an amplifier U7, pins 19 and 20 of the amplifier U7 are connected with capacitors C2 and C16, a power supply V1 is connected with pins 21 and 22 of the amplifier U7 through inductors L6 and L7, power is supplied, two sets of grounding capacitors C29 and C30 are connected in parallel between the inductor L6 and the pin 21 of the amplifier U7, two sets of grounding capacitors C37 and C38 are connected in parallel between the inductor L7 and the pin 22 of the amplifier U7, both sets of grounding capacitors C37 and C38 are used for grounding filtering, pin 16 of the amplifier U7 is connected to the low-pass filtering amplifying module 4 through capacitors C4 and C20 connected in series, the junction of the capacitors C4 and C20 is grounded through a resistor R12, pin 17 of the amplifier U7 is connected to the low-pass filtering amplifying module 4 through capacitors C3 and C17 connected in series, the junction of the capacitors C3 and C17 is grounded through a resistor R6, and pins 12, 13 and 14 of the amplifier U7 are connected to an external control circuit.
Preferably, the model of the amplifier U7 is HMC960LP4E.
Preferably, the low-pass filtering and amplifying module includes a programmable filter U5, pins 30 and 31 of the programmable filter U5 are used as signal input pins, and are respectively connected with capacitors C17 and C20, and the model of the programmable filter U5 is ADRF6510ACPZ.
Preferably, the first band-pass filtering module includes a transformer U4 and a band-pass filter U6, the 4 pin and the 6 pin of the transformer U4 are respectively connected with the 24 pin and the 23 pin of the programmable filter U5 through series resistor-capacitor circuits, the 4 pin and the 6 pin of the transformer U4 are connected through two parallel ground resistors, the 5 pin of the transformer U4 is grounded through a capacitor C18 and a resistor R32 which are connected in series, and the 1 pin of the transformer U4 is connected with the input end of the band-pass filter U6 through a resistor R42 and a capacitor C26 which are connected in series.
Preferably, the model of the band-pass filter U6 is LBP-6.25M, and the model of the transformer U4 is ADT8-1T+.
The utility model has the advantages that: the dual-channel receiving signal processing is carried out, the input signal is converted into a differential signal, then the amplification and attenuation processing is carried out, the low-pass filtering is carried out, a large out-of-band interference source can be refused, meanwhile, the wanted signal is reliably promoted, the signal noise is reduced, and the signal distortion is avoided.
Drawings
FIG. 1 is a schematic diagram of an intermediate frequency signal filtering circuit according to an embodiment;
FIG. 2 is a schematic diagram of a first single-ended signal conversion circuit;
FIG. 3 is a schematic diagram of a differential signal amplifying module;
FIG. 4 is a schematic diagram of a low pass filter amplifier module;
fig. 5 is a schematic circuit diagram of a first band-pass filter module.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
As shown in fig. 1 to 5, an intermediate frequency signal filtering processing circuit includes a first single-ended signal conversion circuit 1, a second single-ended signal conversion circuit 2, a differential signal amplification module 3, a low-pass filter amplification module 4, a first band-pass filter module 5 and a second band-pass filter module 6, wherein the output end of the first single-ended signal conversion circuit 1 and the output end of the second single-ended signal conversion circuit 2 are respectively connected with the input pins of the differential signal amplification module 3, two output pins of the differential signal amplification module 3 are respectively connected with the input pins of the low-pass filter amplification module 4, the output pins of the low-pass filter amplification module 4 are respectively connected with the output ends of the first band-pass filter module 5 and the second band-pass filter module 6, the first single-ended signal conversion circuit 1 includes a first transformer U1, the pin 1 of the first transformer U1 is grounded through a resistor R10, the pin 2 is emptied, the pin 3 is connected with a signal through a resistor R28, the pin 4 is connected with one end of a resistor R26, after the resistor R91 is connected in series with R34, the other end of the resistor 26 is connected between the resistor R28 and the R26, the other end of the resistor 26 is connected with the input pin of the resistor 4 through a capacitor R16 and the capacitor R4, the differential signal conversion module 6 is connected with the other end of the resistor 4 through the capacitor R14 and the resistor 4 in series, the resistor 4 is connected with the resistor 4 through the resistor 4 and the resistor 4 through the resistor 2, the resistor 4 and the resistor 4 is connected with the end of the resistor through the resistor 1C 1 through the resistor 4. Specifically, in this embodiment, the first single-ended signal conversion circuit 1 and the second single-ended signal conversion circuit 2 have the same structure, and are both used for accessing the signals amplified by the comparator, performing conversion processing, respectively converting the input single-ended signals into differential signals, and then providing the differential signals to the differential signal amplification module 3 for amplification processing, where the 3 pin resistor R28 of the first transformer U1 is used as a current limiter, the 4/6 pin output pin outputs through the series resistor-capacitor circuit, so as to reduce the passing capability of the low-frequency signals, increase the passing capability of the high-frequency signals, amplify the differential signals after the subsequent differential signal amplification module 3 receives the signals, and provide the low-pass filtering amplification module 4 with low-pass filtering, so as to reduce signal noise and maintain signal reliability, and the low-pass filtering amplification module 4 outputs a path of signals to the first band-pass filtering module 5, and converts the differential signals into single-ended signals again, so that a large out-of-band interference source can be rejected, and meanwhile, the signal noise can be reliably improved, and signal distortion can be avoided.
As an alternative embodiment, the first transformer U1 is of the type ADT8-1t+.
Example two
On the basis of the first embodiment, as shown in fig. 3, the differential signal amplifying module 3 includes an amplifier U7, pins 19 and 20 of the amplifier U7 are connected with capacitors C2 and C16, a power supply V1 is connected with pins 21 and 22 of the amplifier U7 through inductors L6 and L7, power is supplied, two grounding capacitors C29 and C30 are connected in parallel between the inductor L6 and the pin 21 of the amplifier U7, two grounding capacitors C37 and C38 are connected in parallel between the inductor L7 and the pin 22 of the amplifier U7, both grounding capacitors are used for grounding filtering, pin 16 of the amplifier U7 is connected to the low-pass filtering amplifying module 4 through capacitors C4 and C20 connected in series, the junction of the capacitors C4 and C20 is grounded through a resistor R12, pin 17 of the amplifier U7 is connected to the low-pass filtering amplifying module 4 through capacitors C3 and C17 connected in series, the junction of the capacitors C3 and C17 is grounded through a resistor R6, and pins 12, 13 and 14 of the amplifier U7 are connected to an external control circuit. Specifically, the amplifier U7 is connected with a power supply through the inductors L6 and L7, so that radiation is reduced, high-frequency common-mode noise is reduced, the grounded capacitor can be stably output, voltage stabilization is beneficial, and through series capacitor output, direct communication is blocked, and high-frequency signal communication is ensured to be normal. The three 12.13.14 pins of the amplifier U7 are respectively connected with the control end of the external singlechip through resistors R35.R31.R22 and used for adjusting the frequency.
As an alternative embodiment, the model of the amplifier U7 is HMC960LP4E.
Example III
On the basis of the second embodiment, as shown in fig. 4, the low-pass filtering amplifying module 4 includes a programmable filter U5, pins 30 and 31 of the programmable filter U5 are used as signal input pins, and are respectively connected with capacitors C17 and C20, the model of the programmable filter U5 is ADRF6510ACPZ, which is a pair of matched full-differential low-noise and low-distortion programmable filters and Variable Gain Amplifiers (VGAs), each channel can reject a large out-of-band interference source, and reliably boost a desired signal, thereby reducing the bandwidth and resolution requirements of an analog-to-digital converter (ADC), VPS of the low-pass filtering amplifying module is connected with a singlechip, and can be used for changing the frequency of the programmable filter U5, and pins 23 and 24 of the programmable filter U5 are respectively output through a capacitor C27/resistor R43 and a capacitor C31/R45 connected in series, so as to filter the output signal, and ensure the reliability of the circuit signal.
Example IV
On the basis of the third embodiment, as shown in fig. 5, the first band-pass filter module 5 includes a transformer U4 and a band-pass filter U6, the 4 pin and the 6 pin of the transformer U4 are respectively connected with the 24 pin and the 23 pin of the programmable filter U5 through series resistor-capacitor circuits, the 4 pin and the 6 pin of the transformer U4 are connected through two parallel ground resistors, the 5 pin of the transformer U4 is grounded through a capacitor C18 and a resistor R32 which are connected in series, and the 1 pin of the transformer U4 is connected with the input end of the band-pass filter U6 through a resistor R42 and a capacitor C26 which are connected in series, so that differential signals are converted into single-ended signals to be output, and the signals of the transformer U4 are input and output and commonly grounded, thereby preventing external signal interference. The second band-pass filtering module 6 has a structure identical to that of the first band-pass filtering module 5, and is not described in detail herein, and the second band-pass filtering module and the first band-pass filtering module have the same structure and the same technical effect.
As an alternative embodiment, the model of the band-pass filter U6 is LBP-6.25M and the model of the transformer U4 is ADT8-1t+.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (7)
1. An intermediate frequency signal filtering processing circuit is characterized in that: the low-pass filter amplifier comprises a first single-ended signal conversion circuit, a second single-ended signal conversion circuit, a differential signal amplification module and a low-pass filter amplification module, wherein the first pin 1 of the first transformer U1 is grounded through a resistor R10, the second pin 2 is connected with a signal through a resistor R28, the first pin 4 is connected with one end of a resistor R26 in series, the resistor R91 is connected between the resistor R28 and the resistor R26 in series, the other end of the resistor R26 is connected with the first input pin of the differential signal amplification module through a resistor R27 and a capacitor C16 which are connected in series, the output pin of the low-pass filter amplification module is connected with the output ends of the first band-pass filter module and the second band-pass filter module respectively, the first single-ended signal conversion circuit comprises a first transformer U1, the first pin 1 is grounded through a resistor R10, the second pin 3 is connected with one end of a resistor R26 in series, the resistor R91 is connected with the resistor R26, the other end of the resistor R26 is connected between the resistor R28 and the resistor R26 in series, the other end of the resistor R26 is connected with the resistor R5 through a resistor R6 and a capacitor C16 which is connected with the resistor R4 in series, and the other end of the resistor R4 is connected with the resistor R4 in series, and the resistor R4 through a resistor R4 and the resistor R11 which is connected with the resistor R4 in series, and the other end of the resistor R4 is connected with the resistor R11.
2. An intermediate frequency signal filtering processing circuit as defined in claim 1, wherein: the model of the first transformer U1 is ADT8-1T+.
3. An intermediate frequency signal filtering processing circuit as defined in claim 1, wherein: the differential signal amplifying module comprises an amplifier U7, 19 pins and 20 pins of the amplifier U7 are connected with capacitors C2 and C16, a power supply V1 is connected with 21 pins and 22 pins of the amplifier U7 through inductors L6 and L7 respectively to supply power, two groups of grounding capacitors C29 and C30 are connected in parallel between the inductor L6 and the 21 pin of the amplifier U7, two groups of grounding capacitors C37 and C38 are connected in parallel between the inductor L7 and the 22 pin of the amplifier U7 and are used for grounding filtering, 16 pins of the amplifier U7 are connected into the low-pass filtering amplifying module through capacitors C4 and C20 which are connected in series, the joint of the capacitors C4 and C20 is grounded through a resistor R12, 17 pins of the amplifier U7 are connected into the low-pass filtering amplifying module through capacitors C3 and C17 which are connected in series, the joint of the capacitors C3 and C17 is grounded through a resistor R6, and the 12, 13 and 14 pins of the amplifier U7 are connected with an external control circuit.
4. An intermediate frequency signal filtering processing circuit as claimed in claim 3, characterized in that: the model of the amplifier U7 is HMC960LP4E.
5. An intermediate frequency signal filtering processing circuit as claimed in claim 3, characterized in that: the low-pass filtering and amplifying module comprises a programmable filter U5, a pin 30 and a pin 31 of the programmable filter U5 are used as signal input pins and are respectively connected with a capacitor C17 and a capacitor C20, and the model of the programmable filter U5 is ADRF6510ACPZ.
6. An intermediate frequency signal filtering processing circuit as defined in claim 5, wherein: the first band-pass filtering module comprises a transformer U4 and a band-pass filter U6, wherein a 4 pin and a 6 pin of the transformer U4 are respectively connected with a 24 pin and a 23 pin of a programmable filter U5 through series resistor-capacitor circuits, the 4 pin and the 6 pin of the transformer U4 are connected through two paths of parallel ground resistors, a 5 pin of the transformer U4 is grounded through a capacitor C18 and a resistor R32 which are connected in series, and a 1 pin of the transformer U4 is connected with the input end of the band-pass filter U6 through a resistor R42 and a capacitor C26 which are connected in series.
7. An intermediate frequency signal filtering processing circuit as defined in claim 6, wherein: the model of the band-pass filter U6 is LBP-6.25M, and the model of the transformer U4 is ADT8-1T+.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322141324.4U CN220732740U (en) | 2023-08-10 | 2023-08-10 | Intermediate frequency signal filtering processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322141324.4U CN220732740U (en) | 2023-08-10 | 2023-08-10 | Intermediate frequency signal filtering processing circuit |
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| Publication Number | Publication Date |
|---|---|
| CN220732740U true CN220732740U (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322141324.4U Active CN220732740U (en) | 2023-08-10 | 2023-08-10 | Intermediate frequency signal filtering processing circuit |
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| CN (1) | CN220732740U (en) |
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- 2023-08-10 CN CN202322141324.4U patent/CN220732740U/en active Active
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