Driving circuit for improving frequency hopping rate
By connecting the capacitors in the frequency hopping filter driving circuit to accelerate the charge and discharge characteristics of the capacitors in the frequency hopping filter driving circuit, the conduction and cut-off speed of the transistor are improved, and the problem of slow frequency hopping speed in the prior art is solved, and a higher frequency hopping speed and faster response speed are achieved.
Patent Information
- Application Number
- CN202421229250.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The frequency hopping rate of existing frequency hopping filters is slow, resulting in slow equipment response, easy to track signals, incomplete useful signals and easy to lose.
A driving circuit including a current limiting resistor and a transistor is designed. By accelerating the charge and discharge characteristics of the capacitor in parallel, the conduction and cutoff speed of the transistor are improved, thereby accelerating the response speed of the driving circuit.
The change rate increase of the driving circuit is achieved by more than 10μs, providing a faster frequency hopping rate, and meeting the needs of a higher frequency hopping filter driver circuit with a higher frequency hopping speed.
Smart Images
Figure CN222620891U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a driving circuit for improving the frequency hopping rate, belonging to the technical field of driving circuits. Background Art
[0002] Faster frequency hopping rate has always been the goal of frequency hopping filters. The existing frequency hopping filters can no longer meet the needs of more advanced equipment under the rapid technological upgrades, so each improvement in frequency hopping rate is very difficult. The frequency hopping performance issues are as follows:
[0003] 1) The frequency hopping rate is slow, causing the device to respond slowly;
[0004] 2) The frequency hopping rate is slow and the signal is easy to track;
[0005] 3) The frequency hopping rate is slow, the useful signal is incomplete, and the signal is easily lost. Summary of the invention
[0006] The technical problem to be solved by the utility model is to provide a driving circuit for improving the frequency hopping rate, so as to solve the problems existing in the above-mentioned prior art.
[0007] The technical solution adopted by the utility model is: a driving circuit for improving the frequency hopping rate, comprising a current limiting resistor R1, a current limiting resistor R2, a current limiting resistor R3, a current limiting resistor R4, a transistor Q1, a transistor Q2, a transistor Q3, a capacitor C1 and a capacitor C2, the capacitor C1 and the capacitor C2 are respectively connected in parallel to the current limiting resistor R1 and the current limiting resistor R2, one end of the current limiting resistor R1 and the current limiting resistor R2 are connected to each other as an input terminal IN, and the other ends of the current limiting resistor R1 and the current limiting resistor R2 are respectively connected to The base electrodes of transistor Q1 and transistor Q2, the collector of transistor Q1 and the base of transistor Q3 are connected to one end of current limiting resistor R3, the other end of current limiting resistor R3 is connected to one end of current limiting resistor R4 and high voltage end VBB at the same time, the other end of current limiting resistor R4 is connected to the collector of transistor Q3, the emitter of transistor Q3 is connected to the collector of transistor Q2 as the driving output end OUT, the emitter of transistor Q2 is connected to the emitter of transistor Q1 and then connected to the ground end GND.
[0008] Furthermore, the resistance values of the current limiting resistor R1 , the current limiting resistor R2 , the current limiting resistor R3 and the current limiting resistor R4 are 2KΩ, 2KΩ, 200KΩ and 330Ω respectively.
[0009] Furthermore, the transistor Q1, the transistor Q2 and the transistor Q3 are all NPN transistors MMBT5551.
[0010] Furthermore, the capacitor C1 and the capacitor C2 are 820PF capacitors.
[0011] The beneficial effects of the utility model are as follows: compared with the prior art, the utility model provides a higher jumping speed driving circuit for the frequency hopping filter (in the circuit, a higher jumping speed is achieved by connecting acceleration capacitors C1 and C2 in parallel next to the current limiting resistors R1 and R2, and the rapid response of the front stage controls the rapid change of the rear stage driving circuit, thereby improving the ability of the driving circuit to respond quickly and drive the filter to jump quickly), and utilizes the charging and discharging characteristic curve of the capacitor to accelerate the conduction and cutoff of the transistor, and the charging and discharging characteristics of the capacitor timely supplement the control ability of the control end, accelerates the first stage control reaction time and drives the rear stage circuit to change in time, thereby achieving the purpose of rapid jumping, and can enable the driving circuit to achieve a change rate increase of more than 10μs, thereby providing the frequency hopping filter with a faster driving circuit and meeting the demand for a higher jumping speed frequency hopping filter driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is the circuit schematic;
[0013] Figure 2 It is the volt-ampere characteristic curve of the triode;
[0014] Figure 3 This is a circuit simulation comparison result diagram;
[0015] Figure 4 This is a 3D image of the front of the PCB board;
[0016] Figure 5 This is a 3D image of the back side of the PCB board. DETAILED DESCRIPTION
[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0018] Example 1: Figure 1As shown, a driving circuit for improving the frequency hopping rate includes a current limiting resistor R1, a current limiting resistor R2, a current limiting resistor R3, a current limiting resistor R4, a transistor Q1, a transistor Q2, a transistor Q3, a capacitor C1 and a capacitor C2, the capacitor C1 and the capacitor C2 are respectively connected in parallel to the current limiting resistor R1 and the current limiting resistor R2, one end of the current limiting resistor R1 and the current limiting resistor R2 are connected to each other as an input end IN, the other ends of the current limiting resistor R1 and the current limiting resistor R2 are respectively connected to the base electrodes of the transistor Q1 and the transistor Q2, the collector of the transistor Q1 and the base of the transistor Q3 are connected to one end of the current limiting resistor R3, and the other end of the current limiting resistor R3 is simultaneously connected to the limiting One end of the current limiting resistor R4 is connected to the high voltage end VBB, the other end of the current limiting resistor R4 is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is connected to the collector of the transistor Q2 as the driving output end OUT, the emitter of the transistor Q2 is connected to the emitter of the transistor Q1 and connected to the ground end GND; the resistance values of the current limiting resistors R1, R2, R3 and R4 used for current limiting are 2KΩ, 2KΩ, 200KΩ and 330Ω respectively; the transistors Q1, Q2 and Q3 are all NPN transistors MMBT5551; the capacitors C1 and C2 are 820PF capacitors.
[0019] The utility model provides a higher jump speed driving circuit for the frequency hopping filter (in the circuit, a higher jump speed is achieved by connecting acceleration capacitors C1 and C2 in parallel next to the current limiting resistors R1 and R2, the rapid response of the front stage controls the rapid change of the rear stage driving circuit, and improves the ability of the driving circuit to respond quickly and drive the filter to jump quickly), uses the charging and discharging characteristic curve of the capacitor to accelerate the conduction and cutoff of the transistor, and the charging and discharging characteristics of the capacitor timely supplement the control ability of the control end, accelerates the first stage control reaction time and drives the rear stage circuit to change in time, and achieves the purpose of rapid jump, which can enable the driving circuit to achieve a change rate of more than 10μs, and provide a faster driving circuit for the frequency hopping filter, meeting the demand for a higher jump speed frequency hopping filter driving circuit.
[0020] Embodiment 2: A method for designing a driving circuit for increasing a frequency hopping rate, the method comprising the following steps:
[0021] Step 1: First, select the appropriate transistor MMBT5551 device according to the voltage and current. Checking the relevant data sheet, we know that the device withstands a voltage of +160V. The use scenario of the drive circuit is 100V, which can meet the circuit usage. Calculate the relevant current limiting resistance and capacitance values through the voltage and current and the transistor volt-ampere characteristic curve. Figure 2 Transistor characteristic curve and current requirement calculation: The current limiting resistor R3 of the second-stage transistor is 200K, and the current limiting resistor R1 and current limiting resistor R2 of the first-stage transistor are 2K resistors;
[0022] Step 2: Use Multisim simulation software to simulate and debug the circuit diagram. Finally, the driving speed of the circuit can be improved by connecting 820P capacitors in parallel with R1 and R2 resistors. The simulation diagram data comparison results are as follows: Figure 3 , CH1 is the input level change waveform, CH3 is the drive output waveform without parallel 820P capacitor, CH4 is the drive output waveform after the circuit is optimized. By comparing the simulation results, it can be seen that the driving circuit rise speed is improved after the parallel capacitor is connected;
[0023] Step 3: Draw the schematic diagram according to the selected device. Figure 1 , the control level is input through the input terminal IN, and reaches the base of the transistor Q1 and the transistor Q2 through the current limiting resistor R1 and the current limiting resistor R2;
[0024] When the input terminal IN is high, the threshold voltage U be Greater than 0.7V (due to the transistor threshold voltage U be The first-stage transistor Q1 and transistor Q2 are in the on state. At this moment, the high-voltage terminal VBB reaches the ground terminal GND through the current-limiting resistor R3 and the transistor Q1 in the on state. Therefore, the base voltage of the second-stage transistor Q3 is close to 0V, making the transistor Q3 unable to conduct. Since the transistor Q2 is turned on, the output terminal (OUT) of the drive circuit outputs a 0 level.
[0025] When the input terminal IN is low, the threshold voltage U be Less than 0.7V, the first-stage transistors Q1 and Q2 are in the cut-off state. At this moment, the high-voltage terminal VBB reaches the base electrode of the transistor Q3 through the current-limiting resistor R3, making the threshold voltage U be When the voltage is greater than 0.7V, the high voltage VBB is turned on, and the transistor Q3 in the on state provides the high voltage VBB (+100V) driving voltage to the output end through the current limiting resistor R4. This circuit controls the change of the output voltage through the high and low levels of the input end to drive the frequency hopping filter.
[0026] Step 4: Use AD software to draw the actual PCB circuit board and complete the driver board circuit design. Figure 4 The front of the PCB board, Figure 5 The back side of the PCB board.
[0027] The above description is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present utility model, which should be included in the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.
Claims
1. A driving circuit for increasing a frequency hopping rate, characterized in that: It includes a current limiting resistor R1, a current limiting resistor R2, a current limiting resistor R3, a current limiting resistor R4, a transistor Q1, a transistor Q2, a transistor Q3, a capacitor C1 and a capacitor C2. The capacitor C1 and the capacitor C2 are respectively connected in parallel to the current limiting resistor R1 and the current limiting resistor R2. One end of the current limiting resistor R1 and the current limiting resistor R2 are connected to each other as an input end IN. The other ends of the current limiting resistor R1 and the current limiting resistor R2 are respectively connected to the base of the transistor Q1 and the transistor Q2. The collector of the transistor Q1 and the base of the transistor Q3 are connected to one end of the current limiting resistor R3. The other end of the current limiting resistor R3 is simultaneously connected to one end of the current limiting resistor R4 and a high-voltage end VBB. The other end of the current limiting resistor R4 is connected to the collector of the transistor Q3, and the emitter of the transistor Q3 is connected to the collector of the transistor Q2 as a driving output end OUT. The emitter of the transistor Q2 is connected to the emitter of the transistor Q1 and then connected to the ground end GND.
2. A driving circuit for increasing the frequency hopping rate according to claim 1, characterized in that: The resistance values of the current limiting resistor R1, the current limiting resistor R2, the current limiting resistor R3 and the current limiting resistor R4 are 2KΩ, 2KΩ, 200KΩ and 330Ω respectively.
3. The driving circuit for increasing the frequency hopping rate according to claim 1, characterized in that: Transistor Q1, transistor Q2 and transistor Q3 are all NPN transistors MMBT5551.
4. The driving circuit for increasing the frequency hopping rate according to claim 1, characterized in that: Capacitors C1 and C2 are 820PF capacitors.