CN108512539B - Broadband carrier wave Signal channel switching system - Google Patents
Broadband carrier wave Signal channel switching system Download PDFInfo
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- CN108512539B CN108512539B CN201810550771.6A CN201810550771A CN108512539B CN 108512539 B CN108512539 B CN 108512539B CN 201810550771 A CN201810550771 A CN 201810550771A CN 108512539 B CN108512539 B CN 108512539B
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- H—ELECTRICITY
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- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
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Abstract
A switching circuit and system for wideband carrier signal channel, wherein the input end of the first control signal input circuit in the switching circuit is used for inputting control signals, the output end of the first control signal input circuit is connected with the switching control signal input end of the second control signal switching circuit, the first input end of the second control signal switching circuit is connected with the high voltage rail, the second input end of the second control signal switching circuit is connected with the low voltage rail, and the output end of the second control signal switching circuit is connected with the control signal input end of the output circuit; the output circuit comprises a first a second broadband carrier signal delivery end, the first and second wideband carrier signal transmission ends are wideband carrier signal input and output ends: when the first broadband carrier signal conveying end is used for inputting the broadband carrier signal, the second broadband carrier signal conveying end is used for outputting the broadband carrier signal; when the second wideband carrier signal transmitting end is used for inputting wideband carrier signals, the first wideband carrier signal transmitting end is used for outputting wideband carrier signals.
Description
Technical Field
The invention relates to an integrated circuit analog signal processing technology, in particular to a broadband carrier signal channel switching system.
Background
The ideno semiconductor analog switch and multiplexing basis is described in: the complementary-MOS processes (CMOS) yields good P-channel and N-channel MOSFETs. Connecting the PMOS and NMOS devices in parallel forms the basic bilateral CMOS switch of FIG. 1.This combination reduces the on-resistance, and also produces a resistance which varies much less with signal voltage.
The broadband power line carrier signal is a signal directly transmitted on a power frequency alternating current power line, and the peak-to-peak value of the broadband power line carrier signal can reach 50V. And various electrical load impacts, transformer surges, lightning strokes and other electrical disturbances exist on the power line. The existing analog signal switch circuit is based on an MOS tube, has low capability of tolerating high voltage and instant large current, is easy to damage due to field load impact, static electricity or surge impact in the field application of broadband carrier communication, and has low reliability. If the electrostatic and surge protection circuit is added, the analog signal switch circuit based on the MOS tube needs to obtain higher working voltage, the wafer area is large, the cost is high, and in the complementary bidirectional technology, the MOS greatly increases the power and the cost.
The broadband carrier signal channel switching circuit or system which is stable, reliable, low in power, small in size and low in cost is found and becomes the current research direction.
Disclosure of Invention
A wideband carrier signal path switching system, wherein: the broadband carrier signal channel switching circuit comprises a decoder, two paths and more than two paths of broadband carrier signal channel switching circuits, wherein the broadband carrier signal channel switching circuits have the same structure: the high-voltage power supply circuit comprises a corresponding first control signal input circuit, a corresponding second control signal switch circuit and a corresponding output circuit, wherein the corresponding first control signal input circuit is a corresponding control signal output circuit of a decoder, the output end of the corresponding first control signal input circuit is a corresponding control signal output end of the decoder, the output end of the corresponding first control signal input circuit is connected with the switch control signal input end of the corresponding second control signal switch circuit, the first input end of the corresponding second control signal switch circuit is connected with a high-voltage rail, the second input end of the corresponding second control signal switch circuit is connected with a low-voltage rail, and the output end of the corresponding second control signal switch circuit is connected with the control signal input end of the corresponding output circuit; the corresponding output circuit comprises a first broadband carrier signal transmission end and a second broadband carrier signal transmission end, wherein the first broadband carrier signal transmission end and the second broadband carrier signal transmission end are broadband carrier signal input and output ends: when the first broadband carrier signal conveying end is used for inputting the broadband carrier signal, the second broadband carrier signal conveying end is used for outputting the broadband carrier signal; when the second broadband carrier signal conveying end is used for inputting the broadband carrier signal, the first broadband carrier signal conveying end is used for outputting the broadband carrier signal; broadband carrier signal input ends of output circuits in corresponding broadband carrier signal channel switch circuits are connected with corresponding broadband carrier signal input ends of the broadband carrier signal channel switch systems in a one-to-one correspondence manner; the broadband carrier signal output ends of the output circuits in the corresponding broadband carrier signal channel switch circuits are all connected with the output ends of the broadband carrier signal channel switch systems;
the output circuit comprises a corresponding output control NPN triode and a corresponding first resistor: the base electrode of the output control NPN triode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the output end of the corresponding second control signal switching circuit; the collector electrode of the output control NPN triode is a first broadband carrier signal transmission end, and the emitter electrode of the output control NPN triode is a second broadband carrier signal transmission end; when the broadband carrier signal channel switch system chip is manufactured, a plurality of output control NPN triodes are manufactured into vertical devices, and the model of the output control NPN triodes is PSBB4160;
the second control signal switching circuit comprises a corresponding second resistor, a corresponding first NPN triode, a corresponding third resistor, a corresponding first PNP triode, a corresponding fourth resistor and a corresponding fifth resistor, wherein the first end of the second resistor is connected with a corresponding control signal output end of the decoder, the second end of the second resistor is connected with a base electrode of the first NPN triode, an emitting electrode of the first NPN triode is connected with a low voltage rail, a collecting electrode of the first NPN triode is connected with a second end of the fourth resistor, the first end of the fourth resistor is connected with a second end of the third resistor in series, and the first end of the third resistor is connected with a high voltage rail; the middle joint of the first end of the fourth resistor and the second end of the third resistor is connected with the base electrode of the first PNP triode, the emitter electrode of the first PNP triode is connected with the high voltage rail, the collector electrode of the first PNP triode is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the low voltage rail, and the collector electrode of the first PNP triode and the middle joint of the first end of the fifth resistor are connected with the control signal input end of the corresponding output circuit; and the reverse amplification factor of the NPN triode is controlled to be more than or equal to 30 by the corresponding output of the output circuit in each path of broadband carrier signal channel switching circuit in the broadband carrier signal channel switching system.
A wideband carrier signal path switching system, wherein: the broadband carrier signal channel switching circuit comprises a decoder, two paths and more than two paths of broadband carrier signal channel switching circuits, wherein the broadband carrier signal channel switching circuits have the same structure: the high-voltage power supply circuit comprises a corresponding first control signal input circuit, a corresponding second control signal switch circuit and a corresponding output circuit, wherein the corresponding first control signal input circuit is a corresponding control signal output circuit of a decoder, the output end of the corresponding first control signal input circuit is a corresponding control signal output end of the decoder, the output end of the corresponding first control signal input circuit is connected with the switch control signal input end of the corresponding second control signal switch circuit, the first input end of the corresponding second control signal switch circuit is connected with a high-voltage rail, the second input end of the corresponding second control signal switch circuit is connected with a low-voltage rail, and the output end of the corresponding second control signal switch circuit is connected with the control signal input end of the corresponding output circuit; the corresponding output circuit comprises a first broadband carrier signal transmission end and a second broadband carrier signal transmission end, wherein the first broadband carrier signal transmission end and the second broadband carrier signal transmission end are broadband carrier signal input and output ends: when the first broadband carrier signal conveying end is used for inputting the broadband carrier signal, the second broadband carrier signal conveying end is used for outputting the broadband carrier signal; when the second broadband carrier signal conveying end is used for inputting the broadband carrier signal, the first broadband carrier signal conveying end is used for outputting the broadband carrier signal; broadband carrier signal input ends of output circuits in corresponding broadband carrier signal channel switch circuits are connected with corresponding broadband carrier signal input ends of the broadband carrier signal channel switch systems in a one-to-one correspondence manner; the broadband carrier signal output ends of the output circuits in the corresponding broadband carrier signal channel switch circuits are all connected with the output ends of the broadband carrier signal channel switch systems;
the output circuit comprises a corresponding output control NPN triode and a corresponding first resistor, wherein the base electrode of the output control NPN triode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the output end of the corresponding second control signal switching circuit; the output control NPN triode has an emitter as a first broadband carrier signal transmission end, and the output control NPN triode has a collector as a second broadband carrier signal transmission end; when the broadband carrier signal channel switch system chip is manufactured, a plurality of output control NPN triodes are manufactured into vertical devices, and the model of the output control NPN triodes is PSBB4160;
the second control signal switching circuit comprises a corresponding second resistor, a corresponding first NPN triode, a corresponding third resistor, a corresponding first PNP triode, a corresponding fourth resistor and a corresponding fifth resistor, wherein the first end of the second resistor is connected with a corresponding control signal output end of the decoder, the second end of the second resistor is connected with a base electrode of the first NPN triode, an emitting electrode of the first NPN triode is connected with a low voltage rail, a collecting electrode of the first NPN triode is connected with a second end of the fourth resistor, the first end of the fourth resistor is connected with a second end of the third resistor in series, and the first end of the third resistor is connected with a high voltage rail; the middle joint of the first end of the fourth resistor and the second end of the third resistor is connected with the base electrode of the first PNP triode, the emitter electrode of the first PNP triode is connected with the high voltage rail, the collector electrode of the first PNP triode is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the low voltage rail, and the collector electrode of the first PNP triode and the middle joint of the first end of the fifth resistor are connected with the control signal input end of the corresponding output circuit; and the reverse amplification factor of the NPN triode is controlled to be more than or equal to 30 by the corresponding output of the output circuit in each path of broadband carrier signal channel switching circuit in the broadband carrier signal channel switching system.
The invention provides a broadband carrier signal channel switching system, which is characterized in that a decoder controls the gating of each broadband carrier signal channel switching circuit so as to control the output of one broadband carrier signal, wherein an input signal of the broadband carrier signal channel switching circuit controls the on-off of a second control signal switching circuit through a first control signal input circuit, the second control signal switching circuit controls the on-off of an output circuit, and a broadband carrier signal is input and output through a first broadband carrier signal transmission end and a second broadband carrier signal transmission end of the output circuit so as to achieve the switching function of controlling the on-off of the broadband carrier signal.
Drawings
Fig. 1 is a schematic diagram of a prior art MOS transistor based analog signal switching circuit.
FIG. 2 is a schematic diagram of a wideband carrier signal path switching circuit according to the present invention;
FIG. 3 is a circuit diagram of one embodiment of the wideband carrier signal path switching circuit of the present invention;
fig. 4 is another specific circuit diagram of the wideband carrier signal path switching circuit of the present invention;
fig. 5 is a schematic diagram of the structure of a wideband carrier signal path switching system of the present invention;
FIG. 6 is a circuit diagram of a four-way switching system of one embodiment of the wideband carrier signal path switching system of the present invention;
FIG. 7 is a schematic circuit diagram of an embodiment of a single channel switching circuit for a wideband carrier signal in accordance with the present invention;
fig. 8 is a graphical representation of simulation results of the implementation of fig. 7.
Detailed Description
The invention provides a broadband carrier signal channel switching circuit, as shown in fig. 2, which comprises a first control signal input circuit, a second control signal switching circuit and an output circuit, wherein the input end of the first control signal input circuit is used for inputting control signals, the output end of the first control signal input circuit is connected with the switch control signal input end of the second control signal switching circuit and is used for conveying switch control signals CTL, the first input end of the second control signal switching circuit is connected with a high voltage rail VCC, the second input end of the second control signal switching circuit is connected with a low voltage rail GND, and the output end of the second control signal switching circuit is connected with the control signal input end of the output circuit and is used for conveying control signals Scout; the output circuit comprises a first broadband carrier signal conveying end and a second broadband carrier signal conveying end, wherein the first broadband carrier signal conveying end and the second broadband carrier signal conveying end are broadband carrier signal input and output ends: when the first broadband carrier signal transmission end is used for inputting the broadband carrier signal IN, the second broadband carrier signal transmission end is used for outputting the broadband carrier signal OUT; when the second wideband carrier signal transmitting terminal is used for inputting the wideband carrier signal IN, the first wideband carrier signal transmitting terminal is used for outputting the wideband carrier signal OUT.
Fig. 3 is a schematic diagram of an embodiment of the wideband carrier signal path switching circuit shown in fig. 2:
the second control signal switching circuit comprises a second resistor R1, a first NPN triode Q1, a third resistor, a first PNP triode Q2, a fourth resistor R3 and a fifth resistor R4, wherein the first end of the second resistor R1 is connected with the output end of the first control signal input circuit and is used for inputting a switching control signal CTL, the second end of the second resistor R1 is connected with the base electrode of the first NPN triode Q1, the emitter electrode of the first NPN triode is connected with a low voltage rail GND, the collector electrode of the first NPN triode Q1 is connected with the second end of the fourth resistor R3, the first end of the fourth resistor R3 is connected with the second end of the third resistor R2 in series, and the first end of the third resistor R2 is connected with a high voltage rail VCC; the middle joint of the first end of the fourth resistor R3 and the second end of the third resistor R2 is connected with the base electrode of the first PNP triode Q2, the emitter electrode of the first PNP triode Q2 is connected with the high-voltage rail VCC, the collector electrode of the first PNP triode Q2 is connected with the first end of the fifth resistor R4, the second end of the fifth resistor R4 is connected with the low-voltage rail GND, and the middle joint of the collector electrode of the first PNP triode Q2 and the first end of the fifth resistor R4 is connected with the control signal input end of the output circuit and used for conveying the control signal Scout to the output circuit.
The output circuit comprises an output control NPN triode QS1 and a first resistor RS1, wherein the base electrode of the output control NPN triode QS1 is connected with the first end of the first resistor RS1, and the second end of the first resistor RS1 is connected with the output end of the second control signal switching circuit and is used for inputting a control signal Scout; the collector of the output control NPN triode QS1 is a first broadband carrier signal transmission end and is used for inputting a signal IN, and the emitter of the output control NPN triode QS1 is a second broadband carrier signal transmission end and is used for outputting a signal OUT.
When the first control signal input circuit outputs a switch control signal CTL, the switch control signal CTL is sent to a base electrode of a first NPN triode Q1 in the second control signal switch circuit, the first NPN triode Q1 is conducted, a base electrode of a first PNP triode Q2 is electrified, the first PNP triode Q2 is conducted, and a control signal Scout is output from a junction between a collector electrode of the first PNP triode Q2 and a fifth resistor R4; IN the output circuit, a control signal Scout is loaded to the base electrode of an output control triode QS1 after being limited by a first resistor RS1, the output control triode QS1 is conducted, the collector electrode of the output control triode QS1 inputs a broadband carrier signal IN, and the emitter electrode of the output control triode QS1 outputs a broadband carrier signal OUT.
To adapt to the broadband carrier transmission requirement, the reverse amplification factor B of the output control triode QS1 R Is larger than the value required for realizing reverse saturation conduction, preferably reverse amplification factor B R And (3) the reverse amplification factor is the ratio of the current flowing into the emitter E to the current flowing into the base B when the voltages of the emitter E and the base B are higher than the voltage of the collector C and do not reach saturation.
In the conventional application, the NPN triode requires that the collector C voltage is always higher than the emitter E voltage, the reverse working state of the NPN triode is freshly reported, and found by actual measurement, some triodes can also work in the state that the emitter E voltage is higher than the collector C voltage.
Description: 1. the principle of reverse amplification of NPN triode is applied, but not the principle of reverse amplifier, the reverse amplifier refers to a reverse voltage amplifier, the output voltage is 180 degrees different from the input voltage, and the amplifier has certain voltage, current and power amplification effects.
2. The current general switch electric chip is realized by using a MOS tube, and a switch circuit made of an NPN triode is manufactured into a chip, so that the volume can be made smaller, and meanwhile, the cost can be reduced.
3. The bidirectional conduction is realized by utilizing the characteristic of reverse amplification factor of the triode.
Fig. 4 is a schematic diagram of another embodiment of the wideband carrier signal path switching circuit of fig. 2:
the second control signal switching circuit comprises a second resistor R1, a first NPN triode Q1, a third resistor, a first PNP triode Q2, a fourth resistor R3 and a fifth resistor R4, wherein the first end of the second resistor R1 is connected with the output end of the first control signal input circuit and is used for inputting a switching control signal CTL, the second end of the second resistor R1 is connected with the base electrode of the first NPN triode Q1, the emitter electrode of the first NPN triode is connected with a low voltage rail GND, the collector electrode of the first NPN triode Q1 is connected with the second end of the fourth resistor R3, the first end of the fourth resistor R3 is connected with the second end of the third resistor R2 in series, and the first end of the third resistor R2 is connected with a high voltage rail VCC; the middle joint of the first end of the fourth resistor R3 and the second end of the third resistor R2 is connected with the base electrode of the first PNP triode Q2, the emitter electrode of the first PNP triode Q2 is connected with the high-voltage rail VCC, the collector electrode of the first PNP triode Q2 is connected with the first end of the fifth resistor R4, the second end of the fifth resistor R4 is connected with the low-voltage rail GND, and the middle joint of the collector electrode of the first PNP triode Q2 and the first end of the fifth resistor R4 is connected with the control signal input end of the output circuit and used for conveying the control signal Scout to the output circuit.
The output circuit comprises an output control NPN triode QS1 and a first resistor RS1, wherein the base electrode of the output control NPN triode QS1 is connected with the first end of the first resistor RS1, and the second end of the first resistor RS1 is connected with the output end of the second control signal switching circuit and is used for inputting a control signal Scout; the emitter of the output control NPN triode QS1 is a first broadband carrier signal transmission end and is used for inputting a signal IN, and the collector of the output control NPN triode QS1 is a second broadband carrier signal transmission end and is used for outputting a signal OUT.
When the first control signal input circuit outputs a switch control signal CTL, the switch control signal CTL is sent to a base electrode of a first NPN triode Q1 in the second control signal switch circuit, the first NPN triode Q1 is conducted, a base electrode of a first PNP triode Q2 is electrified, the first PNP triode Q2 is conducted, and a control signal Scout is output from a junction between a collector electrode of the first PNP triode Q2 and a fifth resistor R4; IN the output circuit, the control signal Scout is loaded to the base electrode of the output control triode QS1 after being limited by the first resistor RS1, the output control triode QS1 is turned on, the emitter electrode of the output control triode QS1 inputs the broadband carrier signal IN, and the collector electrode of the output control triode QS1 outputs the broadband carrier signal OUT.
To adapt to the broadband carrier transmission requirement, the reverse amplification factor B of the output control triode QS1 R Is larger than the value required for realizing reverse saturation conduction, preferably reverse amplification factor B R And (3) the reverse amplification factor is the ratio of the current flowing into the emitter E to the current flowing into the base B when the voltages of the emitter E and the base B are higher than the voltage of the collector C and do not reach saturation.
As can be seen from fig. 3 and fig. 4, the wideband carrier signal channel switching circuit of the present technical solution can be used as a bidirectional analog switch, and can realize bidirectional conduction of the wideband carrier signal.
The invention also provides a broadband carrier signal channel switching system, as shown in the schematic diagram of fig. 5: the broadband carrier signal channel switching circuit comprises a decoder, two paths and more than two paths of broadband carrier signal channel switching circuits, wherein the broadband carrier signal channel switching circuits have the same structure: the circuit comprises a corresponding first control signal input circuit, a corresponding second control signal switch circuit and a corresponding output circuit, wherein the corresponding first control signal input circuit is a corresponding control signal output circuit of a decoder, an output end CTL of the corresponding first control signal input circuit is a corresponding control signal output end of the decoder, an output end CTL of the corresponding first control signal input circuit is connected with a switch control signal input end of the corresponding second control signal switch circuit, a first input end of the corresponding second control signal switch circuit is connected with a high voltage rail, a second input end of the corresponding second control signal switch circuit is connected with a low voltage rail, and an output end of the corresponding second control signal switch circuit is connected with a control signal input end of the corresponding output circuit; the corresponding output circuit comprises a first broadband carrier signal transmission end and a second broadband carrier signal transmission end, wherein the first broadband carrier signal transmission end and the second broadband carrier signal transmission end are broadband carrier signal input and output ends: when the first broadband carrier signal conveying end is used for inputting the broadband carrier signal, the second broadband carrier signal conveying end is used for outputting the broadband carrier signal; when the second broadband carrier signal conveying end is used for inputting the broadband carrier signal, the first broadband carrier signal conveying end is used for outputting the broadband carrier signal; corresponding wideband carrier signal input ends IN of output circuits IN the wideband carrier signal channel switching circuits are connected with corresponding wideband carrier signal input ends MuxIN1, muxIN2 of the wideband carrier signal channel switching system IN a one-to-one correspondence manner; and the broadband carrier signal output ends OUT of the output circuits in the corresponding broadband carrier signal channel switch circuits are all connected with the output end MuxOUT of the broadband carrier signal channel switch system.
The output circuit comprises a corresponding output control NPN triode and a corresponding first resistor: the base electrode of the output control NPN triode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the output end of the corresponding second control signal switching circuit; the collector electrode of the output control NPN triode is a first broadband carrier signal transmission end, and the emitter electrode of the output control NPN triode is a second broadband carrier signal transmission end.
In another case, the output circuit comprises a corresponding output control NPN triode and a corresponding first resistor, wherein the base electrode of the output control NPN triode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the output end of the corresponding second control signal switch circuit; the output control NPN triode has an emitter as the first wideband carrier signal transmitting end and a collector as the second wideband carrier signal transmitting end.
The second control signal switching circuit comprises a corresponding second resistor, a corresponding first NPN triode, a corresponding third resistor, a corresponding first PNP triode, a corresponding fourth resistor and a corresponding fifth resistor, wherein a first end CTL of the second resistor is connected with a corresponding control signal output end of the decoder, a second end of the second resistor is connected with a base electrode of the first NPN triode, an emitter electrode of the first NPN triode is connected with a low voltage rail, a collector electrode of the first NPN triode is connected with a second end of the fourth resistor, a first end of the fourth resistor is connected with a second end of the third resistor in series, and a first end of the third resistor is connected with a high voltage rail; the middle joint of the first end of the fourth resistor and the second end of the third resistor is connected with the base electrode of the first PNP triode, the emitter electrode of the first PNP triode is connected with the high voltage rail, the collector electrode of the first PNP triode is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the low voltage rail, and the collector electrode of the first PNP triode and the middle of the first end of the fifth resistor are connected with the control signal input end of the corresponding output circuit.
And the reverse amplification factor of the NPN triode is controlled to be more than or equal to 30 by the corresponding output of the output circuit in each path of broadband carrier signal channel switching circuit in the broadband carrier signal channel switching system.
The operation of each path of wideband carrier signal channel switch circuit in the wideband carrier signal channel switch system is not repeated.
The decoder selects and controls which path of broadband carrier signal channel switch circuit is conducted. The input ends A1 and A2 of the decoder are high-low level signals input from the outside, and the input ends A and E of the decoder are high-low level signals input from the outside, and M is less than or equal to 2 on the assumption that M paths of broadband carrier signal channel switch circuits are arranged on the premise that M paths of broadband carrier signal channel switch circuits are arranged on the ground n (power of n of 2), typically taking m=2 n 。
When manufacturing a broadband carrier signal channel switch system chip, an NPN tube is preferably used as an output control triode QS1, a plurality of output control triodes QS1 are made into a vertical device, and compared with the same horizontal process, the vertical NPN tube has a small base area, so that the speed is higher. The P region of the NPN tube is more convenient and easier in process control. The NPN tube is made into a transverse structure, and the P area can not be minimized due to the limitation of design rules because the P area can only be connected with signals through the lead holes, thereby completely destroying the advantages of the NPN tube. Thus, NPN tubes are preferred for vertical devices.
The PNP tube and the NPN tube are complementary, the PNP tube has no way to be made into a vertical structure as the NPN, and the transverse PNP tube is the most common. For the base electrode of PNP, the parasitic resistance is also greatly influenced, and the diffusion N doping can be adopted to replace the ion implantation process in the process, so that the lower resistance is obtained.
When the output control transistor QS1 is turned on, the input signal terminal (IN) is connected to the output signal terminal (OUT), IN which case the wideband carrier signal path switching circuit is considered to be closed, and when the wideband carrier signal path switching circuit is closed, the voltage signal at the input signal terminal (IN) is transmitted to the output signal terminal (OUT). When the output control transistor QS1 is turned off, the input signal terminal (IN) is disconnected from the output signal terminal (OUT), IN which case the broadband carrier signal path switching circuit is considered to be turned off. When the wideband carrier signal path switching circuit is open, the voltage signal at the input signal terminal (IN) is not passed to the output signal terminal (OUT). The output control transistor QS1 is controlled by the output signal SCout of the second control signal switching circuit 100. The switch control signal input terminal of the second control signal switch circuit 100 receives a switch control signal (CTL), the switch control signal is a binary signal of logic high or logic low (which may also be simply referred to as high and low), and if the switch control signal is high, the output signal SCout of the second control signal switch circuit 100 is low, so that the output control transistor QS1 in the output circuit is turned off; if the switching control signal is low, the output signal SCout of the second control signal switching circuit 100 is high, and the output control transistor QS1 in the output circuit is turned on.
The wideband carrier signal path switching circuit may operate normally as long as the input wideband carrier signal received at the input signal terminal (IN) is greater than the low voltage rail (GND) and less than the high voltage rail (VCC). The wideband carrier signal path switching circuit may be used as a bi-directional analog switch (without distinguishing between input and output).
The switching system of fig. 5, the switching system 310 is shown as including a plurality of switching circuits 300-1, 300-2 … … -N, collectively referred to as switching circuits 300. Any of the embodiments of the switching circuit 300 described above IN the embodiments of fig. 2, 3 may be used, each embodiment of the switching circuit 300 including a switch control signal terminal (CTL), an input signal terminal (IN), an output signal terminal (OUT). Each of the input signal terminals (IN) is connected to a one-to-one switching system input terminal Mux IN1, mux IN2 … … Mux INN. The output signal terminals (OUT) of the plurality of switching circuits 300-1, 300-2 … … -N are tied together and connected to the output signal terminal (Mux OUT) of the switching system. The switching system 310 also includes a decoder 301 that includes select inputs Sel1, sel2 … … Sel M. The output of the decoder is connected to the switch control signal terminal (CTL) of the switching circuit 300, and is used to select which of the switching systems 310 has its input signal terminal (IN) connected to its output signal terminal (OUT), while the remainder of the switching systems 310 have their input signal terminal (IN) disconnected from their output signal terminal (OUT).
A plurality of switch circuits and decoders are manufactured on a chip, and a 4-way switch system is taken as an example, as shown in fig. 6, one group of decoders with the model of 74HC139 is selected as the decoders in the embodiment (the 74HC139 comprises two groups of 2-4 decoders), A1 and A2 are address input ends of the decoders, an ES enabling end (active low level) is used for controlling data output ends Y1-Y4 of the decoders, and the decoder is used for selecting which way of output of the switch circuits.
The truth table for the decoder is as follows:
when the 1 st switch is selected, a broadband carrier signal Mux IN1 is input, a low level is input to a decoder enabling end ES, 00 is input to a decoder address input end A1A2, at the moment, a decoder data output end Y1 is low level, decoder data output ends Y2, Y3 and Y4 are high level, a switch circuit D1 is gated, and data is output, wherein Mux OUT=mux IN1; setting A2 nd switching circuit, inputting a broadband carrier signal Mux IN2, inputting a low level to a decoder enabling end ES, inputting 01 to a decoder address input end A1A2, wherein a decoder data output end Y2 is low level, decoder data output ends Y1, Y3 and Y4 are high level, gating a switching circuit D2, and outputting data, wherein Mux OUT=mux IN2; setting a 3 rd path, inputting a broadband carrier signal Mux IN3, inputting a low level to a decoder enabling end ES, inputting 10 to a decoder address input end A1A2, wherein a decoder data output end Y3 is low level, decoder data output ends Y1, Y2 and Y4 are high level, gating a switch circuit D3, and outputting data, wherein Mux OUT=mux IN3; let the 4 th path be selected, input the broadband carrier signal Mux IN4, the decoder enable end ES input low level, the decoder address input end A1A2 input 11, at this time the decoder data output end Y4 is low level, the decoder data output ends Y1, Y2, Y3 are high level, the switch circuit D4 gates, the data output, mux out=mux IN4. When Mux out=mux IN enable end ES inputs high level, the present switching system stops working.
Specific embodiments of the present invention are shown in fig. 7: the input signal Sin is a carrier signal, the voltage of the carrier signal is from 0 to 12V, and the frequency range is from 2MHz to 12MHz. The output circuit of the broadband carrier signal channel switching circuit is based on an NPN triode QS1, wherein the QS1 is selected as PSBB4160, the highest CE withstand voltage value of the triode is 60V, the collector C of the triode is connected with an input signal Sin through current 1A, the forward amplification factor exceeds 400, the reverse amplification factor is about 50, the emitter E is connected with an output signal Sout, and the base B of the triode is connected with the collector C of a PNP triode Q2 through a current limiting resistor Rs 1. The voltage source control switching circuit is composed of Q1, Q2, R1, R2, R3 and R4, Q2 is selected as 2SB734, Q1 is selected as 2SB106, collector C of PNP triode Q2 is connected with ground level GND through resistor R4, emitter E is connected with voltage source Vcc, base stage connection R2, R3 and R2 are connected with voltage source Vcc, R3 is connected with collector C of NPN triode Q1, emitter of triode Q1 is connected with ground level GND, and base stage is connected with switch control signal CTL through R1. Simulation is carried out through Multisim12 software, a simulation circuit diagram is shown in fig. 8, a voltage source control switch circuit is equivalent by S1, the amplitude of an input signal Sin is 1V, the frequency is 5MHz, a simulation result is watched through a virtual oscilloscope, as shown in fig. 8, in order to show the anti-surge and anti-impact effects, A, B channels are adopted for comparison, the signals of the A channel are equivalent to adding RC filtering on the basis of the signals of the B channel, and the output of the A, B channels is not different from the simulation result, so that the circuit has good anti-surge and anti-impact capabilities.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. A wideband carrier signal path switching system, characterized by: the broadband carrier signal channel switching circuit comprises a decoder, two paths and more than two paths of broadband carrier signal channel switching circuits, wherein the broadband carrier signal channel switching circuits have the same structure: the high-voltage power supply circuit comprises a corresponding first control signal input circuit, a corresponding second control signal switch circuit and a corresponding output circuit, wherein the corresponding first control signal input circuit is a corresponding control signal output circuit of a decoder, the output end of the corresponding first control signal input circuit is a corresponding control signal output end of the decoder, the output end of the corresponding first control signal input circuit is connected with the switch control signal input end of the corresponding second control signal switch circuit, the first input end of the corresponding second control signal switch circuit is connected with a high-voltage rail, the second input end of the corresponding second control signal switch circuit is connected with a low-voltage rail, and the output end of the corresponding second control signal switch circuit is connected with the control signal input end of the corresponding output circuit; the corresponding output circuit comprises a first broadband carrier signal transmission end and a second broadband carrier signal transmission end, wherein the first broadband carrier signal transmission end and the second broadband carrier signal transmission end are broadband carrier signal input and output ends: when the first broadband carrier signal conveying end is used for inputting the broadband carrier signal, the second broadband carrier signal conveying end is used for outputting the broadband carrier signal; when the second broadband carrier signal conveying end is used for inputting the broadband carrier signal, the first broadband carrier signal conveying end is used for outputting the broadband carrier signal; broadband carrier signal input ends of output circuits in corresponding broadband carrier signal channel switch circuits are connected with corresponding broadband carrier signal input ends of the broadband carrier signal channel switch systems in a one-to-one correspondence manner; the broadband carrier signal output ends of the output circuits in the corresponding broadband carrier signal channel switch circuits are all connected with the output ends of the broadband carrier signal channel switch systems;
the output circuit comprises a corresponding output control NPN triode and a corresponding first resistor: the base electrode of the output control NPN triode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the output end of the corresponding second control signal switching circuit; the collector electrode of the output control NPN triode is a first broadband carrier signal transmission end, and the emitter electrode of the output control NPN triode is a second broadband carrier signal transmission end; when the broadband carrier signal channel switch system chip is manufactured, a plurality of output control NPN triodes are manufactured into vertical devices, and the model of the output control NPN triodes is PSBB4160;
the second control signal switching circuit comprises a corresponding second resistor, a corresponding first NPN triode, a corresponding third resistor, a corresponding first PNP triode, a corresponding fourth resistor and a corresponding fifth resistor, wherein the first end of the second resistor is connected with a corresponding control signal output end of the decoder, the second end of the second resistor is connected with a base electrode of the first NPN triode, an emitting electrode of the first NPN triode is connected with a low voltage rail, a collecting electrode of the first NPN triode is connected with a second end of the fourth resistor, the first end of the fourth resistor is connected with a second end of the third resistor in series, and the first end of the third resistor is connected with a high voltage rail; the middle joint of the first end of the fourth resistor and the second end of the third resistor is connected with the base electrode of the first PNP triode, the emitter electrode of the first PNP triode is connected with the high voltage rail, the collector electrode of the first PNP triode is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the low voltage rail, and the collector electrode of the first PNP triode and the middle joint of the first end of the fifth resistor are connected with the control signal input end of the corresponding output circuit; and the reverse amplification factor of the NPN triode is controlled to be more than or equal to 30 by the corresponding output of the output circuit in each path of broadband carrier signal channel switching circuit in the broadband carrier signal channel switching system.
2. A wideband carrier signal path switching system, characterized by: the broadband carrier signal channel switching circuit comprises a decoder, two paths and more than two paths of broadband carrier signal channel switching circuits, wherein the broadband carrier signal channel switching circuits have the same structure: the high-voltage power supply circuit comprises a corresponding first control signal input circuit, a corresponding second control signal switch circuit and a corresponding output circuit, wherein the corresponding first control signal input circuit is a corresponding control signal output circuit of a decoder, the output end of the corresponding first control signal input circuit is a corresponding control signal output end of the decoder, the output end of the corresponding first control signal input circuit is connected with the switch control signal input end of the corresponding second control signal switch circuit, the first input end of the corresponding second control signal switch circuit is connected with a high-voltage rail, the second input end of the corresponding second control signal switch circuit is connected with a low-voltage rail, and the output end of the corresponding second control signal switch circuit is connected with the control signal input end of the corresponding output circuit; the corresponding output circuit comprises a first broadband carrier signal transmission end and a second broadband carrier signal transmission end, wherein the first broadband carrier signal transmission end and the second broadband carrier signal transmission end are broadband carrier signal input and output ends: when the first broadband carrier signal conveying end is used for inputting the broadband carrier signal, the second broadband carrier signal conveying end is used for outputting the broadband carrier signal; when the second broadband carrier signal conveying end is used for inputting the broadband carrier signal, the first broadband carrier signal conveying end is used for outputting the broadband carrier signal; broadband carrier signal input ends of output circuits in corresponding broadband carrier signal channel switch circuits are connected with corresponding broadband carrier signal input ends of the broadband carrier signal channel switch systems in a one-to-one correspondence manner; the broadband carrier signal output ends of the output circuits in the corresponding broadband carrier signal channel switch circuits are all connected with the output ends of the broadband carrier signal channel switch systems;
the output circuit comprises a corresponding output control NPN triode and a corresponding first resistor, wherein the base electrode of the output control NPN triode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the output end of the corresponding second control signal switching circuit; the output control NPN triode has an emitter as a first broadband carrier signal transmission end, and the output control NPN triode has a collector as a second broadband carrier signal transmission end; when the broadband carrier signal channel switch system chip is manufactured, a plurality of output control NPN triodes are manufactured into vertical devices, and the model of the output control NPN triodes is PSBB4160;
the second control signal switching circuit comprises a corresponding second resistor, a corresponding first NPN triode, a corresponding third resistor, a corresponding first PNP triode, a corresponding fourth resistor and a corresponding fifth resistor, wherein the first end of the second resistor is connected with a corresponding control signal output end of the decoder, the second end of the second resistor is connected with a base electrode of the first NPN triode, an emitting electrode of the first NPN triode is connected with a low voltage rail, a collecting electrode of the first NPN triode is connected with a second end of the fourth resistor, the first end of the fourth resistor is connected with a second end of the third resistor in series, and the first end of the third resistor is connected with a high voltage rail; the middle joint of the first end of the fourth resistor and the second end of the third resistor is connected with the base electrode of the first PNP triode, the emitter electrode of the first PNP triode is connected with the high voltage rail, the collector electrode of the first PNP triode is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the low voltage rail, and the collector electrode of the first PNP triode and the middle joint of the first end of the fifth resistor are connected with the control signal input end of the corresponding output circuit; and the reverse amplification factor of the NPN triode is controlled to be more than or equal to 30 by the corresponding output of the output circuit in each path of broadband carrier signal channel switching circuit in the broadband carrier signal channel switching system.
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