CN210724713U - Digital control circuit and switch type frequency hopping filter - Google Patents
Digital control circuit and switch type frequency hopping filter Download PDFInfo
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- CN210724713U CN210724713U CN201921599572.0U CN201921599572U CN210724713U CN 210724713 U CN210724713 U CN 210724713U CN 201921599572 U CN201921599572 U CN 201921599572U CN 210724713 U CN210724713 U CN 210724713U
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Abstract
The utility model relates to a digital control circuit, including inductance L1, inductance L4, first tuning return circuit, coupling circuit, second tuning return circuit; one end of the inductor L1 is in communication connection with external control equipment through an RFIN port, the other end of the inductor L1 is electrically connected with a first tuning loop, the first tuning loop is electrically connected with a second tuning loop through a coupling circuit, and the second tuning loop is electrically connected with one end of the inductor L4; and the other end of the inductor L4 is connected with external equipment through an RFOUT port, the utility model also discloses a switch type frequency hopping filter; the four filter modules are tuned, so that the overall performance of the filter is improved, and the production debugging efficiency is higher.
Description
Technical Field
The utility model relates to an electronic communication field especially relates to a digital control circuit and on-off frequency hopping filter.
Background
In recent years, with the rapid development of electronic technology, the application of radio communication technology is becoming more and more widespread. The radio frequency front end is used as an important component of the transceiver, and the main function is to screen the received high-frequency signals during receiving; when transmitting, it can effectively filter out useless transmitting clutter frequency and prevent the wireless interference signal of other transmitter from entering the transmitter. With the increase of the size, power consumption and other technical requirements of the rf front end by users, the rf front end needs to be more and more miniaturized and have lower power consumption.
In the control circuit of the conventional frequency hopping filter, the voltage of a diode is not easy to adjust, so that the resonance point of the filter cannot be adjusted and controlled with high precision, and the control circuit is not beneficial to application in some complex environments.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a digital control circuit and switch mode frequency hopping filter are provided to solve the problem that the resonance point of wave filter can't realize the regulation and control of high accuracy in the background art.
The utility model discloses a following technical means realizes solving above-mentioned technical problem:
a digital control circuit comprises an inductor L1, an inductor L4, a first tuning loop, a coupling circuit and a second tuning loop; one end of the inductor L1 is in communication connection with external control equipment through an RFIN port, the other end of the inductor L1 is electrically connected with a first tuning loop, the first tuning loop is electrically connected with a second tuning loop through a coupling circuit, and the second tuning loop is electrically connected with one end of the inductor L4; and the other end of the inductor L4 is connected to an external device through an RFOUT port, and outputs a control signal, wherein,
the coupling circuit comprises a voltage stabilizing diode D3, a voltage stabilizing diode D4 and a voltage stabilizing diode D5; wherein; the anode of the zener diode D3 is electrically connected to the ends connected to the inductors L2 and D1, the cathode of the zener diode D3, the cathode of the zener diode D4 and the cathode of the zener diode D5 are electrically connected to each other, the interconnected ends of the cathode of the zener diode D3, the cathode of the zener diode D4 and the cathode of the zener diode D5 are electrically connected to the power source VCC1, the anode of the zener diode D4 is grounded, and the anode of the zener diode D5 is electrically connected to the second tuning loop.
Varactor D3, varactor D4 and varactor D5 form a coupling circuit, the reverse junction voltage of varactor D3, varactor D4 and varactor D5 is controlled through voltage, the capacitance of the varactor D4 and varactor D5 changes along with the voltage, and the capacitance coupling of the first tuning loop and the second tuning loop is optimized, so that better adjustment precision is realized, the reverse junction voltage of the varactors (D3-D5) is skipped, the varactors (D3-D5) have different capacitance values, when the filter is applied, the resonance frequency point of the filter can be changed accordingly, and high-precision adjustment and control are realized.
As a further aspect of the present invention: the first tuning loop comprises an inductor L2, a voltage stabilizing diode D1 and a voltage stabilizing diode D2; wherein the content of the first and second substances,
the inductor L2 is electrically connected with one end of the inductor L1, one end of the inductor L2 is electrically connected with the anode of the zener diode D2, and one end of the inductor L2 connected with the anode of the zener diode D2 is grounded; the other end of the inductor L2 is electrically connected with the anode of the zener diode D1, the cathode of the zener diode D1 is electrically connected with the cathode of the zener diode D2, the end of the zener diode D1, which is connected with the cathode of the zener diode D2, is connected to the power supply VCC2, and the end of the inductor L2, which is connected with the anode of the diode D1, is electrically connected with the coupling circuit.
Inductance L2 and varactor D1, varactor D2 make up into first tuning return circuit, give varactor D1 and varactor D2 input reverse junction voltage, can change varactor D1 and varactor D2's junction capacitance, and then optimize tuning frequency and index performance.
As a further aspect of the present invention: the second tuning loop comprises an inductor L3, a voltage stabilizing diode D6 and a voltage stabilizing diode D7; the anode of the zener diode D6 is electrically connected to the anode of the zener diode D5, the cathode of the zener diode D6 is electrically connected to the cathode of the zener diode D7, the end of the zener diode D6 connected to the cathode of the zener diode D7 and the end of the zener diode D7 connected to the power source VCC2, the anodes of the zener diode D6 and the zener diode D7 are electrically connected to one end of the inductor L3, respectively, and the end of the zener diode D7 connected to the inductor L3 is grounded; the inductor L3 is also connected to one end of the inductor L4, and connected to the RFOUT port through the inductor L4, thereby outputting a signal.
Inductance L4 and varactor D6, varactor D7 make up into the second tuning return circuit, give varactor D6 and varactor D7 input reverse junction voltage, can change varactor D6 and varactor D7's junction capacitance, can optimize tuning frequency and index performance.
As a further aspect of the present invention: one end of the inductor L1 is connected to the midpoint of the inductor L2, and one end of the inductor L4 is connected to the midpoint of the inductor L3.
One end of the inductor L4 is connected to the midpoint of the inductor L3, so that the circuit has more accurate control performance.
As a further aspect of the present invention: the inductance L1 and the inductance L4 are input and output matching inductors respectively.
A switch type frequency hopping filter based on the control circuit comprises a first switch, a filter bank, a second switch and a digital control circuit; the first switch is electrically connected with the filter block, the other end of the filter block is electrically connected with the second switch, and the first switch, the filter bank and the second switch are electrically connected with the digital control circuit.
The filter bank is tuned, so that the overall performance of the switch type frequency hopping filter is improved, the production debugging efficiency is higher, and the switch can be controlled by the digital control module to realize switching in the filter bank.
As a further aspect of the present invention: the filter bank comprises a plurality of filter modules, in the embodiment, the filter bank comprises four filter modules, each filter module comprises one of a digital filter and a low-pass filter, the tuning range of each filter module is 30 MHz-90 MHz, 90 MHz-225 MHz, 225 MHz-512 MHz and 512 MHz-678 MHz in sequence, and the first switch and the second switch are single-pole four-throw switches.
The utility model has the advantages that:
1. the utility model discloses in, varactor D3, varactor D4 makes up into coupling circuit with varactor D5, through voltage control varactor D3, varactor D4 and varactor D5 reverse junction voltage, make its electric capacity change along with voltage, optimize first harmonic return circuit, the capacitive coupling in second harmonic return circuit, thereby realize better regulation precision, skip the reverse junction voltage of varactor (D3-D5), make varactor (D3-D5) present different capacitance values, when applying to in the wave filter, the resonance frequency point that can make the wave filter also changes thereupon, realize the regulation and control of higher precision.
2. In the utility model, in the first tuning loop, inductor L2, varactor diode D1 and varactor diode D2 are combined into a first tuning loop, and reverse junction voltage is input to varactor diode D1 and varactor diode D2, so that junction capacitance of varactor diode D1 and varactor diode D2 can be changed, and tuning frequency and index performance can be optimized; in the second tuning loop, the inductor L4, the varactor diode D6 and the varactor diode D7 are combined into the second tuning loop, and the tuning frequency and the index performance can be optimized similarly.
3. The utility model discloses in, a plurality of filter module tunes, not only makes switch-type frequency hopping filter's wholeness ability improve, and production debugging efficiency is higher moreover, can control switch realize switching between a plurality of filter module through digital control circuit.
4. The utility model discloses in, first switch, second switch are single-pole four-throw switch, and utensil switching time is fast, the insertion loss is little, characteristics such as high isolation and anti-interference.
Drawings
Fig. 1 is a schematic circuit diagram of a digital control circuit in embodiment 1 provided by the present invention.
Fig. 2 is a block diagram of a switch-mode frequency hopping filter according to embodiment 2 of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example 1
Fig. 1 is a schematic circuit diagram of a digital control circuit according to embodiment 1 of the present invention; referring to fig. 1, a digital control circuit includes an inductor L1, an inductor L4, a first tuning loop, a coupling circuit, and a second tuning loop; one end of the inductor L1 is in communication connection with an external control device through an RFIN port (RaDio Frequency signal input port), the control device can input a high level or a low level from the RFIN port, the other end of the inductor L1 is electrically connected with a first tuning loop, the first tuning loop is electrically connected with a second tuning loop through a coupling circuit, and the second tuning loop is electrically connected with one end of the inductor L4; and the other end of the inductor L4 is connected to an external device through an RFOUT port (RaDio Frequency signal output port), and outputs a control signal.
In this embodiment, the first tuning loop includes an inductor L2, a zener diode D1, and a zener diode D2; wherein the content of the first and second substances,
the inductor L2 is electrically connected with one end of the inductor L1, one end of the inductor L2 is electrically connected with the anode of the zener diode D2, and one end of the inductor L2 connected with the anode of the zener diode D2 is grounded; the other end of the inductor L2 is electrically connected to the anode of the zener diode D1, the cathode of the zener diode D1 is electrically connected to the cathode of the zener diode D2, the end of the zener diode D1, which is connected to the cathode of the zener diode D2, is connected to the power source VCC2 (voltage current controller, power supply voltage), and the end of the inductor L2, which is connected to the zener diode D1, is electrically connected to the coupling circuit.
The coupling circuit comprises a voltage stabilizing diode D3, a voltage stabilizing diode D4 and a voltage stabilizing diode D5; wherein; the anode of the zener diode D3 is electrically connected to the ends connected to the inductor L2 and the zener diode D1, the cathode of the zener diode D3, the cathode of the zener diode D4 and the cathode of the zener diode D5 are electrically connected to each other, the ends connected to the cathode of the zener diode D3, the cathode of the zener diode D4 and the cathode of the zener diode D5 are electrically connected to the power source VCC1, the anode of the zener diode D4 is grounded, and the anode of the zener diode D5 is electrically connected to the second tuning loop.
Further, the second tuning loop comprises an inductor L3, a zener diode D6, and a zener diode D7; the anode of the zener diode D6 is electrically connected to the anode of the zener diode D5, the cathode of the zener diode D6 is electrically connected to the cathode of the zener diode D7, the end of the zener diode D6 connected to the cathode of the zener diode D7 and the end of the zener diode D7 connected to the power source VCC2, the anodes of the zener diode D6 and the zener diode D7 are electrically connected to one end of the inductor L3, respectively, and the end of the zener diode D7 connected to the inductor L3 is grounded; the inductor L3 is also connected to one end of the inductor L4, and connected to the RFOUT port through the inductor L4, thereby outputting a signal.
In this embodiment, the inductor L2, the varactor diode D1, and the varactor diode D2 form a first tuning loop, and reverse junction voltages are input to the varactor diode D1 and the varactor diode D2, so that junction capacitances of the varactor diode D1 and the varactor diode D2 can be changed, and tuning frequency and index performance can be optimized; the inductor L4, the variable capacitance diode D6 and the variable capacitance diode D7 form a second tuning loop, reverse junction voltage is input to the variable capacitance diode D6 and the variable capacitance diode D7, junction capacitance of the variable capacitance diode D6 and the variable capacitance diode D7 can be changed, and tuning frequency and index performance can be optimized; the varactor diode D3, the varactor diode D4 and the varactor diode D5 are combined into a coupler, and the reverse junction voltage of the varactor diode D3, the varactor diode D4 and the varactor diode D5 is controlled through voltage, so that the capacitance of the coupler changes along with the voltage, and the capacitive coupling of the two harmonic loops is optimized.
Preferably, one end of the inductor L1 is connected to the midpoint of the inductor L2, and one end of the inductor L4 is connected to the midpoint of the inductor L3, so that the circuit has more accurate control performance.
Preferably, the inductance L1 and the inductance L4 are input and output matching inductors respectively, and play a role in signal transmission matching.
The working principle is as follows: the inductor L2, the variable capacitance diode D1 and the variable capacitance diode D2 form a first tuning loop, reverse junction voltage is input to the variable capacitance diode D1 and the variable capacitance diode D2, junction capacitance of the variable capacitance diode D1 and the variable capacitance diode D2 can be changed, and tuning frequency and index performance are optimized;
the inductor L4, the variable capacitance diode D6 and the variable capacitance diode D7 are combined to form a second tuning loop, and the tuning frequency and the index performance can also be optimized;
varactor D3, varactor D4 and varactor D5 make up into coupling circuit, through voltage control varactor D3, varactor D4 and varactor D5 reverse junction voltage, make its electric capacity change along with the voltage, optimize the capacitive coupling of first tuning return circuit, second tuning return circuit, thereby realize better regulation precision, jump the reverse junction voltage of varactor (D3-D5), make varactor (D3-D5) present different capacitance values, when this circuit applies to the wave filter, can make the resonance frequency point of wave filter also change thereupon, realize the regulation and control of higher accuracy.
Example 2
Fig. 2 is a block diagram of a switch-type frequency hopping filter according to embodiment 2 of the present invention, and as shown in fig. 2, a switch-type frequency hopping filter based on the digital control circuit according to embodiment 1 includes a first switch, a filter bank, a second switch, and a digital control circuit; the first switch is electrically connected with the filter block, the other end of the filter block is electrically connected with the second switch, and the first switch, the filter bank and the second switch are electrically connected with the digital control circuit.
The filter bank comprises a plurality of filter modules, in the embodiment, the filter bank comprises four filter modules, each filter module is electrically connected with the first switch and the second switch, each filter module comprises one of a digital filter and a low-pass filter, the tuning range of each filter module is 30 MHz-90 MHz, 90 MHz-225 MHz, 225 MHz-512 MHz and 512 MHz-678 MHz in sequence, and the first switch and the second switch are single-pole four-throw switches.
The working principle is as follows: in this embodiment, four filter modules tune, not only make the wholeness ability of wave filter improve, and production debugging efficiency is higher moreover, realizes switching between four filter modules through digital control module control switch, and single-pole four-throw switch utensil switching time is fast, the insertion loss is little, characteristics such as high isolation and anti-interference.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A digital control circuit is characterized by comprising an inductor L1, an inductor L4, a first tuning loop, a coupling circuit and a second tuning loop; one end of the inductor L1 is in communication connection with external control equipment through an RFIN port, the other end of the inductor L1 is electrically connected with a first tuning loop, the first tuning loop is electrically connected with a second tuning loop through a coupling circuit, and the second tuning loop is electrically connected with one end of the inductor L4; and the other end of the inductor L4 is connected to an external device through an RFOUT port, wherein,
the coupling circuit comprises a voltage stabilizing diode D3, a voltage stabilizing diode D4 and a voltage stabilizing diode D5; the anode of the zener diode D3 is electrically connected with the first tuning loop, the cathode of the zener diode D3, the cathode of the zener diode D4 and the cathode of the zener diode D5 are electrically connected with each other, the cathode of the zener diode D3 is also electrically connected with the power supply VCC1, the anode of the zener diode D4 is grounded, and the anode of the zener diode D5 is electrically connected with the second tuning loop.
2. The digital control circuit of claim 1, wherein the first tuning loop comprises an inductor L2, a zener diode D1, a zener diode D2; wherein the content of the first and second substances,
the inductor L2 is electrically connected with one end of the inductor L1, one end of the inductor L2 is electrically connected with the anode of the zener diode D2, and one end of the inductor L2 connected with the anode of the zener diode D2 is grounded; the other end of the inductor L2 is electrically connected with the anode of the zener diode D1, the cathode of the zener diode D1 is electrically connected with the cathode of the zener diode D2, the cathode of the zener diode D1 is also electrically connected with the power supply VCC2, and one end of the inductor L2, which is connected with the anode of the diode D1, is electrically connected with the coupling circuit.
3. The digital control circuit of claim 2, wherein the second tuning loop comprises an inductor L3, a zener diode D6, a zener diode D7; the anode of the zener diode D6 is electrically connected with the anode of the zener diode D5, the cathode of the zener diode D6 is electrically connected with the cathode of the zener diode D7, one end of the zener diode D6, which is connected with the cathode of the zener diode D7, is connected to the power VCC2, the anodes of the zener diode D6 and the zener diode D7 are electrically connected with one end of the inductor L3, and the zener diode D7 is grounded; the inductor L3 is also connected to one end of the inductor L4.
4. The digital control circuit of claim 1, wherein the inductance L1 is an input matched inductor and the inductance L4 is an output matched inductor.
5. The digital control circuit as claimed in claim 3, wherein one end of the inductor L1 is connected at the midpoint of the inductor L2, and one end of the inductor L4 is connected at the midpoint of the inductor L3.
6. A switched mode frequency hopping filter based on the digital control circuit of any one of claims 1 to 5, comprising a first switch, a filter bank, a second switch, the digital control circuit; the first switch is electrically connected with the filter block, the other end of the filter block is electrically connected with the second switch, and the first switch, the filter bank and the second switch are electrically connected with the digital control circuit.
7. The switched frequency hopping filter according to claim 6, wherein the filter bank comprises a plurality of filter modules.
8. The switched frequency hopping filter according to claim 6, wherein the filter bank comprises four filter modules.
9. The switched mode frequency hopping filter according to claim 8, wherein the tuning ranges of the four filter modules are, in order: 30 MHz-90 MHz, 90 MHz-225 MHz, 225 MHz-512 MHz, 512 MHz-678 MHz.
10. The switched frequency hopping filter of claim 6, wherein the first switch and the second switch are single pole four throw switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921599572.0U CN210724713U (en) | 2019-09-24 | 2019-09-24 | Digital control circuit and switch type frequency hopping filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921599572.0U CN210724713U (en) | 2019-09-24 | 2019-09-24 | Digital control circuit and switch type frequency hopping filter |
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| Publication Number | Publication Date |
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| CN210724713U true CN210724713U (en) | 2020-06-09 |
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| CN201921599572.0U Active CN210724713U (en) | 2019-09-24 | 2019-09-24 | Digital control circuit and switch type frequency hopping filter |
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| CN (1) | CN210724713U (en) |
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