A PIN tube high voltage switch for frequency hopping filter

Abstract

The present invention provides a PIN tube high-voltage switch for a frequency hopping filter, wherein the emitter of Q3 is connected to +200V, the base is connected to the collector of Q2, and the collector is connected to the base of Q2 through R6 and R4; one end of R2 is connected to L1, and the other end is connected to the emitter of Q2 and the anode of D1, and the cathode of D1 is connected to the collector of Q1; the anode of D2 is connected to +3.3V, and the cathode is connected to C2; and a switch quantity control signal input module is also connected to input a switch quantity control signal. Beneficial effects of the present invention: A PIN tube high-voltage switch for a frequency hopping filter adopts a pull-up resistor with a large resistance value. When the switch output is a low level, only a weak pull-up current is required, and the high-voltage power supply current is reduced when the switch output is a low level, thereby reducing the system power consumption. During the rising edge, the pull-up current is rapidly increased through the self-feedback characteristics of the totem pole, thereby reducing the switch transmission delay and increasing the upper limit of the system's frequency hopping rate.

Description

Technical Field

[0001] The invention belongs to the technical field of frequency hopping filters, and in particular relates to a PIN tube high-voltage switch for a frequency hopping filter. Background Art

[0002] In the current frequency hopping filter, there is a contradiction between the switch transmission delay and the pull-up current in the control of the PIN diode: if the pull-up current is to be reduced, the pull-up resistance must be increased, resulting in an increase in the high-level rise time and an increase in the switch transmission delay; if the high-level rise time is to be reduced and the switch transmission delay is reduced, the pull-up resistance must be reduced, which in turn causes the pull-up current to increase.

[0003] If the pull-up resistance is too large, the switching delay of the PIN tube will increase, reducing the frequency hopping rate; if the pull-up resistance is too small, the power consumption of the frequency hopping filter will increase, the circuit heat will increase, and the system usage time will be reduced. Summary of the invention

[0004] In view of this, the present invention aims to propose a PIN tube high-voltage switch for a frequency hopping filter. Through the totem pole structure of the pull-up circuit, only a weak pull-up current is required when the output is low level. During the rising edge, the self-feedback characteristics of the totem pole are used to increase the pull-up current rapidly, which greatly reduces the switch transmission delay and improves the upper limit of the system's frequency hopping rate.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A PIN tube high-voltage switch for a frequency hopping filter, comprising resistors R2, R3, R4, and R6, capacitors C1 and C2, diodes D1 and D2, an NPN transistor Q2, a PNP transistor Q3, and L1, wherein D2 is a PIN tube switch to be controlled, C2 is a capacitor of a capacitor group of the frequency hopping filter, and L1 is a high-frequency signal isolation inductor;

[0007] The emitter of Q3 is connected to +200V, the base is connected to the collector of Q2, and the collector is connected to the base of Q2 through R6 and R4;

[0008] One end of R2 is connected to L1, and the other end is connected to the emitter of Q2 and the anode of D1. The cathode of D1 is connected to the collector of Q1.

[0009] The anode of D2 is connected to +3.3V, and the cathode is connected to C2;

[0010] A switch quantity control signal input module is also connected to input a switch quantity control signal.

[0011] Furthermore, the switch control signal input module includes an NPN transistor Q1, one end of R3 is connected to +200V, and the other end is connected to the collector of Q1, the base of Q1 is connected to the control signal through R5, and the emitter of Q1 is grounded.

[0012] Furthermore, the switch control signal input module includes NMOS Q1, one end of R3 is connected to +200V, the other end is connected to the drain D of NMOS Q1, the gate G is connected to the control signal through R5, and the source S is grounded.

[0013] Furthermore, the totem pole structure composed of the NPN transistor Q2 and the PNP transistor Q3 is used to provide a fast pull-up current at a rising edge.

[0014] Furthermore, the pull-up resistor R3 is used to provide a weak pull-up current.

[0015] Furthermore, the input control signal is amplified and inverted by an NPN transistor or a MOS tube, and the amplified and inverted signal is isolated by a diode.

[0016] Furthermore, when the control signal is at a high level, transistor Q1 is turned on and outputs a low level, so that the switch is in the on state. At this time, the current flows from +3.3V through D2, L1, R2, D1, Q1 to the ground. Transistors Q2 and Q3 are both in the off state and have no current. Only the pull-up resistor R3 has a weak pull-up current.

[0017] Furthermore, when the control signal changes from a high level to a low level, transistor Q1 is cut off, and the base current of transistor Q2 begins to be provided by R3. The collector current amplified by Q2 is provided to Q3 as the base current, and the collector current amplified by Q3 is fed back to the base of Q2, realizing avalanche-like amplification, causing the pull-up current to rise rapidly, thereby achieving the purpose of reducing the switch transmission delay.

[0018] Furthermore, when the control signal is converted from a low level to a high level, transistor Q1 is turned on, pulling down the base voltage of Q2, so that Q2 is turned off. When Q2 is turned off, the collector has no output current, so that Q3 is also turned off, realizing the conversion from a high level to a low level.

[0019] Compared with the prior art, the PIN tube high-voltage switch for a frequency hopping filter described in the present invention has the following beneficial effects:

[0020] (1) The PIN tube high-voltage switch for a frequency hopping filter described in the present invention adopts a pull-up resistor with a relatively large resistance value. When the switch output is at a low level, only a weak pull-up current is required, which reduces the high-voltage supply current when the switch output is at a low level, thereby reducing the system power consumption. During the rising edge, the pull-up current increases rapidly through the self-feedback characteristics of the totem pole, thereby reducing the switch transmission delay and increasing the upper limit of the system's frequency hopping rate.

[0021] (2) When the output of the PIN tube high-voltage switch for a frequency hopping filter described in the present invention is converted from a low level to a high level, the self-feedback structure of the totem pole causes an avalanche increase in the pull-up current, and the level rises rapidly, so that the switch can quickly output a high level, thereby reducing the transmission delay of the switch;

[0022] (3) The PIN tube high-voltage switch for a frequency hopping filter described in the present invention can be applied to the PIN tube high-voltage switch control of the frequency hopping filter, and can also be applied to other systems requiring high-voltage switch control. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the principle diagram of a PIN tube high-voltage switch for a frequency hopping filter with a triode input according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the principle of a PIN tube high-voltage switch for a frequency hopping filter with MOS tube input according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] A PIN tube high-voltage switch for a frequency hopping filter, comprising resistors R2, R3, R4, and R6, capacitors C1 and C2, diodes D1 and D2, an NPN transistor Q2, a PNP transistor Q3, and L1, wherein D2 is a PIN tube switch to be controlled, C2 is a capacitor of a capacitor group of the frequency hopping filter, and L1 is a high-frequency signal isolation inductor;

[0029] The emitter of Q3 is connected to +200V, the base is connected to the collector of Q2, and the collector is connected to the base of Q2 through R6 and R4;

[0030] One end of R2 is connected to L1, and the other end is connected to the emitter of Q2 and the anode of D1. The cathode of D1 is connected to the collector of Q1.

[0031] The anode of D2 is connected to +3.3V, and the cathode is connected to C2;

[0032] A switch quantity control signal input module is also connected to input a switch quantity control signal.

[0033] The switch control signal input module includes an NPN transistor Q1, one end of R3 is connected to +200V, and the other end is connected to the collector of Q1, the base of Q1 is connected to the control signal through R5, and the emitter of Q1 is grounded.

[0034] The switch control signal input module includes NMOS Q1, one end of R3 is connected to +200V, the other end is connected to the drain D of NMOS Q1, the gate G is connected to the control signal through R5, and the source S is grounded.

[0035] The totem pole structure composed of the NPN transistor Q2 and the PNP transistor Q3 is used to provide a fast pull-up current at the rising edge.

[0036] The pull-up resistor R3 is used to provide a weak pull-up current.

[0037] The input control signal is amplified and inverted by an NPN transistor or a MOS tube, and the amplified and inverted signal is isolated by a diode.

[0038] See also Figure 1 , which is a schematic diagram of a PIN tube high-voltage switch for a frequency hopping filter of the present invention. It can be applied to the PIN tube high-voltage switch control of the frequency hopping filter, and can also be applied to other systems requiring high-voltage switch control.

[0039] like Figure 1 As shown: Its typical structure consists of 2 NPN transistors, 1 PNP transistor, a diode and several resistors and capacitors.

[0040] Among them, D2 is the PIN tube switch that needs to be controlled, C2 is the capacitor group capacitor of the frequency hopping filter, and L1 is the high-frequency signal isolation inductor.

[0041] When the control signal is high, transistor Q1 is turned on and outputs a low level, making the switch in the on state. At this time, the current flows from +3.3V through D2, L1, R2, D1, Q1 to the ground. Transistors Q2 and Q3 are both in the off state and have no current, and only the pull-up resistor R3 has a weak pull-up current.

[0042] When the control signal changes from high level to low level, transistor Q1 is cut off, and the base current of transistor Q2 begins to be provided by R3, and the collector current amplified by Q2 is provided to Q3 as the base current. The collector current amplified by Q3 is fed back to the base of Q2, realizing avalanche amplification, making the pull-up current rise rapidly, and achieving the purpose of reducing the switch transmission delay.

[0043] When the control signal changes from low level to high level, transistor Q1 is turned on, and the base voltage of Q2 is pulled down, so that Q2 is turned off. When Q2 is turned off, there is no output current from the collector, so Q3 is also turned off. The conversion from high level to low level is realized.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A PIN tube high voltage switch for a frequency hopping filter, characterized in that: It includes resistors R2, R3, R4, and R6, capacitors C1 and C2, diodes D1 and D2, NPN transistor Q2, and PNP transistor Q3, and also includes L1, wherein D2 is a PIN transistor switch to be controlled, C2 is a capacitor group capacitor of a frequency hopping filter, and L1 is a high-frequency signal isolation inductor; The emitter of Q3 is connected to +200V, the base is connected to the collector of Q2, and the collector is connected to the base of Q2 through R6 and R4; One end of R2 is connected to L1, and the other end is connected to the emitter of Q2 and the anode of D1. The cathode of D1 is connected to the collector of Q1. The anode of D2 is connected to +3.3V, and the cathode is connected to C2; A switch quantity control signal input module is also connected to input a switch quantity control signal; Among them, one end of R3 is connected to the high-voltage power supply, and the other end is connected to R4, R6, Q1 collector, and D1 cathode; one end of C1 is connected to the ground, and the other end is connected to L1 and R2; one end of L1 is connected to C1 and R2, and the other end is connected to C2 and the cathode of D2; one end of C2 is connected to the ground, and the other end is connected to the cathode of L1 and D2; One end of R4 is connected to the base of Q2, and the other end is connected to R6, R3, the collector of Q1, and the cathode of D1; one end of R6 is connected to the collector of Q3, and the other end is connected to R4, R3, the collector of Q1, and the cathode of D1; Q1 is used as the control signal input amplifier of the PIN tube high voltage switch, and the collector of Q1 is connected to D1, R3, R4, and R6; The switch control signal input module includes an NPN transistor Q1, one end of R3 is connected to +200V, and the other end is connected to the collector of Q1. The base of Q1 is connected to the control signal through R5, and the emitter of Q1 is grounded. The totem pole structure composed of the NPN transistor Q2 and the PNP transistor Q3 is used to provide a fast pull-up current at the rising edge.

2. The PIN tube high-voltage switch for a frequency hopping filter according to claim 1, characterized in that: The pull-up resistor R3 is used to provide a weak pull-up current.

3. The PIN tube high-voltage switch for a frequency hopping filter according to claim 1, characterized in that: The input control signal is amplified and inverted by the NPN transistor Q1 or the MOS tube, and the amplified and inverted signal is isolated by the diode D1.

4. The PIN tube high-voltage switch for a frequency hopping filter according to claim 1, characterized in that: When the control signal is high, transistor Q1 is turned on and outputs a low level, making the switch in the on state. At this time, the current flows from +3.3V through D2, L1, R2, D1, Q1 to ground. Transistors Q2 and Q3 are both in the off state and have no current. Only the pull-up resistor R3 has a weak pull-up current.

5. The PIN tube high-voltage switch for a frequency hopping filter according to claim 1, characterized in that: When the control signal changes from high level to low level, transistor Q1 is cut off, and the base current of transistor Q2 begins to be provided by R3. The collector current amplified by Q2 is provided to Q3 as the base current, and the collector current amplified by Q3 is fed back to the base of Q2, realizing avalanche amplification, making the pull-up current rise rapidly, thereby achieving the purpose of reducing the switch transmission delay.

6. The PIN tube high-voltage switch for a frequency hopping filter according to claim 1, characterized in that: When the control signal is converted from low level to high level, transistor Q1 is turned on, pulling down the base voltage of Q2, so that Q2 is cut off. When Q2 is cut off, the collector of Q2 has no output current, so Q3 is also cut off, realizing the conversion from high level to low level.

Images