CN1160856C - Composite switch circuit and composite switch device - Google Patents
Composite switch circuit and composite switch device Download PDFInfo
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- CN1160856C CN1160856C CNB981163262A CN98116326A CN1160856C CN 1160856 C CN1160856 C CN 1160856C CN B981163262 A CNB981163262 A CN B981163262A CN 98116326 A CN98116326 A CN 98116326A CN 1160856 C CN1160856 C CN 1160856C
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Abstract
The present invention relates to a composite switch circuit for alternately and electrically connecting a first circuit to a third circuit or a second circuit to the third circuit. A lowpass filter circuit is plugged in a switch circuit for generating height symmetry on a circuit construction. The composite switch circuit is arranged on a series of medium basal pieces of a multi-layer integrated body, which enables the composite switch circuit to be miniaturized. As the composite switch circuit with a symmetrical circuit structure, low plug-in loss and high performance are presented in a wide frequency range. The composite switch circuit is especially suitable to form a part of a wireless transceiver in a cellular radio telephone.
Description
Technical field
The present invention relates to a kind of commutation circuit, be particularly related to a kind of like this composite switch circuit (compositeswitch circuit), form by the diode commutation circuit that has embedded low-pass filter circuit, as the high frequency commutation circuit of digital cellular radio telephone etc., receive or emission communication signal transmission passage alternately to switch.The present invention also relates to a kind of composite switch device that comprises the multilayer conglomerate (integral multi-layer body) of composite switch circuit.
Background technology
The commutation circuit of digital cellular radio telephone etc. be used for alternately connecting receiving circuit to antenna or radiating circuit to antenna.In using the radio telephone of diversity system, commutation circuit also alternately connects receiving circuit to first antenna or connect receiving circuit to second antenna.Similarly, in the base station of the wireless communication system that uses the diversity emission system, commutation circuit also is used for alternately connecting radiating circuit to first antenna or connect radiating circuit to second antenna.
Be routed to internal circuit and one and be routed to external tapping having external tapping to be used for to connect the radio telephone of self booster (booster) etc., commutation circuit also to be used to switch one.In addition, commutation circuit is used to switch a series of channels of the base station of wireless communication system.
Figure 11 is the schematic circuit diagram that is illustrated in disclosed traditional commutation circuit among the Japanese patent gazette No.6-197040.In Figure 11, commutation circuit alternately connect radiating circuit Tx to antenna ANT or receiving circuit Rx to antenna ANT.Radiating circuit Tx is connected to the anode of the first diode D101 by first capacitor C 101.The negative electrode of the first diode D101 is connected to antenna ANT by the 3rd capacitor C 103.Antenna ANT also is connected to receiving circuit Rx by the 3rd capacitor C 103, the second transmission line SL2 and the 4th capacitor C 104 of series connection.The anode of the first diode D101 is by the first transmission line SL1 and second capacitor C, 102 ground connection of series connection.In addition, control circuit T1 is connected on the node between the first transmission line SL1 and second capacitor C 102 by resistance R 101.The anode of the second diode D102 is connected on the node between the second transmission line SL2 and the 4th capacitor C 104, its minus earth.Transmission line and some electric capacity are arranged on a series of substrates of multilayer dielectricity body, and diode, resistance and other electric capacity are installed on the end face of dielectric layer body.
When filter circuit and commutation circuit were used together, commutation circuit and filter circuit were formed respectively, connect together then.Thereby, need a sheet of erection space, require adjunct circuit to be used for impedance matching.
In order to address the above problem, Japanese patent gazette No.8-97743 discloses a kind of composite set that comprises commutation circuit and filter circuit.The equivalent electric circuit of this composite set as shown in figure 12.In Figure 12, the filter circuit part is by box indicating shown in the dotted line.Filter circuit is positioned at the place of interconnection radiating circuit Tx and commutation circuit.Equivalent electric circuit when radiating circuit is electrically connected with antenna ANT as shown in figure 13.In equivalent electric circuit, diode D201 and D202 are not shown, because they are operated in the position that the DC electric current passes through, and are in low impedance state formation short circuit.
As can be seen from Figure 13, the traditional circuit that simply filter circuit and commutation circuit is formed by connecting lacks and only shows enough frequency characteristics in the symmetry on the circuit structure in narrow frequency band.See the commutation circuit poor performance of arrowband, and because product variations and productivity ratio is low with the viewpoint that makes full use of the frequency band of distributing to communication system.
Summary of the invention
Correspondingly, the purpose of this invention is to provide a kind of broadband, on circuit structure, have the composite switch circuit of high symmetry and comprise the composite switch device of miniaturization of the multilayer integrated morphology of this composite switch circuit.
By big quantity research based on above-mentioned purpose, the inventor finds, can be by between the diode of commutation circuit and transmission line, low-pass filter circuit being set, replace the simple low-pass filter circuit that connects to improve symmetry on the circuit structure to commutation circuit, thereby compare with conventionally known commutation circuit, reduce the high-performance of inserting waste and guaranteeing commutation circuit in wideer frequency band.
Thereby, according to the first embodiment of the present invention, be used for alternately being electrically connected first circuit to tertiary circuit or second circuit to the composite switch circuit of tertiary circuit, comprise:
(1) first path of interconnection first circuit and tertiary circuit, first path comprises first diode and first transmission line, first end of first diode is connected to tertiary circuit, and first end of first transmission line is connected on the node between second end of first circuit and first diode along separate routes;
(2) alternate path of interconnection second circuit and tertiary circuit, alternate path comprises second transmission line and second diode, first end of second transmission line is connected to tertiary circuit, first end of second diode is connected on second end and the node between the second circuit of second transmission line along separate routes, it is characterized in that described composite switch circuit also comprises:
(3) be arranged on the interior low-pass filter circuit of first path, so that first end of first transmission line that second end of first diode that interconnects and shunt are connected.
In the above-described embodiment, second end of first transmission line is by capacity earth, and first control circuit is connected on the node between first transmission line and the electric capacity by resistance link.Equally, second end of second diode is by another capacity earth, and second control circuit is connected on the node between second diode and the electric capacity by resistance link.First and second control circuits by switching first and second diodes ON state (Low ESR) and OFF state (high impedance) controls first circuit or second circuit is electrically connected on tertiary circuit.
First, second and tertiary circuit can be respectively radiating circuit, receiving circuit and antenna.Therefore, composite switch circuit of the present invention can be the commutation circuit that embeds low-pass filter circuit, can realize alternately connecting radiating circuit to antenna or connection receiving circuit to antenna.
In a preferred embodiment of composite switch circuit of the present invention, first, second and tertiary circuit can be respectively radiating circuit, receiving circuit and antenna, and the negative electrode of first diode is connected to radiating circuit, and the anode of first diode is connected to antenna.Equally, the negative electrode of second diode is connected to receiving circuit, the plus earth of second diode.Thereby, low-pass filter circuit be connected the negative electrode of first diode and first transmission line that connects along separate routes between.
In another preferred embodiment of composite switch circuit of the present invention, first, second and tertiary circuit can be respectively radiating circuit, receiving circuit and antenna, and the anode of first diode is connected to radiating circuit, and the negative electrode of first diode is connected to antenna.Equally, the anode of second diode is connected to receiving circuit, the minus earth of second diode.Thereby, low-pass filter circuit be connected the anode of first diode and first transmission line that connects along separate routes between.
According to second embodiment of the present invention, composite switch device comprises the composite switch circuit on a series of dielectric substrates that are arranged in the multilayer conglomerate, this composite switch circuit can realize alternately being electrically connected first circuit to tertiary circuit or be electrically connected second circuit to tertiary circuit, comprising:
(1) first path of interconnection first circuit and tertiary circuit, first path comprises first diode and first transmission line, first end of first diode is connected to tertiary circuit, and first end of first transmission line is connected on the node between second end of first circuit and first diode along separate routes;
(2) alternate path of interconnection second circuit and described tertiary circuit, alternate path comprises second transmission line and second diode, first end of second transmission line is connected to tertiary circuit, first end of second diode is connected on second end and the node between the second circuit of second transmission line along separate routes, it is characterized in that described composite switch device also comprises:
(3) be arranged on the interior low-pass filter circuit of first path, so that first end of first transmission line that second end of first diode that interconnects and shunt are connected; And at least the first transmission line, the part of second transmission line and low-pass filter circuit are arranged at least one interior media substrate layer of multilayer conglomerate.
In the above-described embodiments, first diode and second diode can be arranged on the end face of multilayer conglomerate.
By arranging at least the first transmission line, second transmission line and a low-pass filter circuit part are at least one interior media substrate of multilayer conglomerate and/or arrange that diode on the end face of multilayer conglomerate, can obtain the composite switch circuit of monomer.Equally, can be arranged on the end face of multilayer conglomerate such as elements such as electric capacity, resistance and inductance.Can suitably select to be arranged in element on the end face of multilayer conglomerate according to the element on the interior substrate layer that is arranged in the multilayer conglomerate.
Composite switch device can comprise at least two grounding electrodes that are arranged on the dielectric substrate.On-chip first and second transmission lines of interior media that are arranged in the multilayer conglomerate can be between two grounding electrodes.Each electric capacity of low-pass filter circuit can be formed by last grounding electrode in two grounding electrodes of clamping first and second transmission lines and the electrode that is provided with thereon with respect to last grounding electrode.By between transmission line and low-pass filter circuit, embedding grounding electrode, can be suppressed at the undesirable interference between transmission line and the low-pass filter circuit with aforesaid way.
In composite switch device of the present invention, the electrode that forms the capacitor plate of low-pass filter circuit can be arranged in installation surface with respect to composite switch device respectively and be positioned on the dielectric substrate above first and second transmission lines.
First and second transmission lines preferably are made up of the spiral electrode pattern, because the screw electrode pattern makes the transmission line physical size shorter.
In a preferred embodiment of composite switch device of the present invention, first, second and tertiary circuit can be respectively radiating circuit, receiving circuit and antenna, and the negative electrode of first diode is connected to radiating circuit, and the anode of first diode is connected to antenna.Equally, the negative electrode of second diode is connected to receiving circuit, the plus earth of second diode.Thereby, low-pass filter circuit be connected the negative electrode of first diode and first transmission line that connects along separate routes between.
In another preferred embodiment of composite switch device of the present invention, first, second and tertiary circuit can be respectively radiating circuit, receiving circuit and antenna, and the anode of first diode is connected to radiating circuit, and the negative electrode of first diode is connected to antenna.Equally, the anode of second diode is connected to receiving circuit, the minus earth of second diode.Thereby, low-pass filter circuit be connected the anode of first diode and first transmission line that connects along separate routes between.
Description of drawings
Fig. 1 is the perspective view that composite switch device of the present invention is shown;
Fig. 2 is the perspective view that the corresponding substrate layer of the multilayer conglomerate that constitutes composite switch device shown in Figure 1 is shown;
Fig. 3 is the schematic circuit diagram that the equivalent electric circuit of the radio transceiver circuitry that comprises composite switch circuit of the present invention is shown;
Fig. 4 illustrates the schematic circuit diagram that radiating circuit Tx is electrically connected with antenna ANT in the equivalent electric circuit of Fig. 3;
Fig. 5 is the schematic circuit diagram that the equivalent electric circuit of the radio transceiver circuitry that comprises another composite switch circuit of the present invention is shown;
Fig. 6 A is the figure that is illustrated in the insertion loss of the composite switch circuit of measuring of the present invention under the frequency of 5.5GHz;
Fig. 6 B is the figure of bandwidth that the amplification of Fig. 6 A is shown;
Fig. 7 is the schematic circuit diagram that the low-pass filtering equivalent electric circuit partly of composite switch circuit of the present invention is shown;
Fig. 8 illustrates the perspective view of formation by the corresponding substrate layer of the multilayer conglomerate of another composite switch circuit layout of the present invention;
Fig. 9 is the schematic circuit diagram that the equivalent electric circuit of the transceiver circuit that comprises the composite switch circuit on the multilayer conglomerate that is arranged in Fig. 8 is shown;
Figure 10 is the schematic circuit diagram that the part equivalent electric circuit of another composite switch circuit of the present invention is shown;
Figure 11 is the schematic circuit diagram that the equivalent electric circuit of traditional commutation circuit is shown;
Figure 12 is the schematic circuit diagram that the equivalent electric circuit of another traditional commutation circuit is shown; With
Figure 13 is the schematic circuit diagram of equivalent electric circuit that traditional commutation circuit of Figure 12 is shown, and wherein radiating circuit Tx is electrically connected to antenna ANT.
Embodiment
As above summed up, composite switch circuit of the present invention is a commutation circuit that comprises low-pass filter circuit, and can realize alternately first circuit being electrically connected with tertiary circuit or second circuit being electrically connected with tertiary circuit.In a preferred embodiment, composite switch circuit can be an antenna switching circuit, and wherein first circuit is a radiating circuit, and second circuit is a receiving circuit, and tertiary circuit is an antenna.The present invention will be explained in more detail at a kind of like this antenna switching circuit.Yet, should be taken into account that it only illustrates one of different preferred embodiments of the present invention.
In the present invention, low-pass filter circuit is integrated with commutation circuit, forms single composite switch circuit.Composite switch circuit can be installed on many medium substrate, forms the miniaturization composite switch circuit of multilayer conglomerate.
Comprise composite switch circuit of the present invention wireless transceiver equivalent electric circuit as shown in Figure 3.In equivalent electric circuit, first circuit is radiating circuit Tx, and second circuit is receiving circuit Rx, and tertiary circuit is antenna ANT.Composite switch circuit 30 in square frame shown in the dotted line comprise first path that connects radiating circuit Tx and antenna ANT with the alternate path that is connected receiving circuit Rx and antenna ANT.First path comprises the first diode D1 and the first transmission line L1, and first end of the first diode D1 is linked antenna ANT, and first end of the first transmission line L1 is connected to along separate routes on second end and the node between the radiating circuit Tx of the first diode D1.Alternate path comprises the second transmission line L2 and the second diode D2, and first end of the second transmission line L2 is connected to antenna ANT, and first end of the second diode D2 is connected to along separate routes on second end and the node between the receiving circuit Rx of the second transmission line L2.
Low-pass filter circuit LPF in square frame shown in the dotted line integrates with commutation circuit with second end of the first diode D1 that interconnects and first end of the first transmission line L1 that is connected along separate routes, thereby forms composite switch circuit of the present invention.As shown in Figure 3, low-pass filter circuit LPF generally includes transmission line L3, capacitor C4 and capacitor C2 and the C3 in parallel with transmission line L3.C2 and C3 form shunt access over the ground.
In addition, as seen from Figure 3, second end of transmission line L1 is by capacitor C14 ground connection, and first control circuit CONT1 is connected between the first transmission line L1 and the capacitor C14 along separate routes by resistance R 1.CONT1 can omit, if abridged words, the first transmission line L1 is direct ground connection just.In addition, second end of the second diode D2 is by capacitor C1 ground connection, and second control circuit CONT2 is connected between the second diode D2 and the capacitor C1 along separate routes by resistance R 2.These control circuits are that radiating circuit Tx (first circuit) or receiving circuit Rx (second circuit) are electrically connected with antenna ANT (tertiary circuit) foundation by bias diode D1 and D2 control.By high-frequency signal, blocking capacitor C11, C12 or C13 are connected to each I/O end of radiating circuit Tx, receiving circuit Rx and antenna ANT for only.
In the present invention, low-pass filter circuit is not simply to link to each other with commutation circuit, but has been merged in commutation circuit, more particularly, integrates with commutation circuit between first end of second end of the first diode D1 and the first transmission line L1 that connects along separate routes.When radiating circuit Tx was electrically connected with antenna ANT, the equivalent electric circuit of Fig. 3 as shown in Figure 4.In Fig. 4, diode D1 and D2 do not illustrate, because they are in high conducting, low impedance state to form short circuit.
As can be seen from Figure 4, composite switch circuit of the present invention is highly symmetrical on circuit structure.Just, radiating circuit Tx, capacitor C11, transmission line L1 and capacitor C14 and antenna ANT, capacitor C13, transmission line L2 and capacitor C1 (C12) place symmetrically about the low-pass filter circuit of centre.Have such symmetry on circuit structure, composite switch circuit of the present invention is compared with traditional commutation circuit, shows very little insertion loss and enough performances in wideer frequency band.
The equivalent electric circuit of another composite switch circuit 50 of the present invention as shown in Figure 5.The equivalent electric circuit of Fig. 5 is similar to the equivalent electric circuit of Fig. 3, except the first and second diode D1 and D2 reverse with respect to the connected mode of negative electrode and anode.When radiating circuit Tx was electrically connected with antenna ANT, the circuit of Fig. 5 had same equivalent electric circuit shown in Figure 4.Just, the composite switch circuit of Fig. 5 is also highly symmetrical on circuit structure, compares with traditional commutation circuit and show very little insertion loss and enough performances in wideer frequency band.
Compare with the equivalent electric circuit of Fig. 5, confirmed that with experimental technique the equivalent electric circuit of Fig. 3 has the isolation that littler insertion loss is become reconciled.
Fig. 1 is the perspective view that composite switch circuit of the present invention is shown.The substrate of the multilayer conglomerate of the composite switch device of pie graph 1 illustrates in Fig. 2 with having an X-rayed, and the equivalent electric circuit that is installed in the composite switch circuit on a series of dielectric substrates of composite switch device of Fig. 1 and Fig. 2 as shown in Figure 3.
As can be seen from Figure 1, composite switch device of the present invention comprises the multilayer conglomerate 2 by the semiconductor device 1 that contains two diodes and a series of dielectric substrates.In Fig. 1 and Fig. 2, the part of expression electrode is illustrated by shade.
In Fig. 3, composite switch circuit of the present invention comprises the element in the square frame shown in the dotted line 30.Capacitor C11 outside square frame 30, C12, C13, C14 and resistor R 1 and R2 are outer members, can form on the circuit board that composite switch circuit is installed, and perhaps can be arranged on the upper surface or dielectric substrate of multilayer conglomerate.
As can be seen from Figure 2, the composite switch device of this embodiment comprises end dielectric substrate 21, interior substrate 22-28 and top dielectric substrate 29.
On the upper surface of end dielectric substrate 21, form first grounding electrode 31, several lead-in wire electrodes reach the side surface of multilayer conglomerate 2 from grounding electrode, to link to each other with T8 with outer electrode T2, T7.
On the upper surface of dielectric substrate stacked on the end dielectric substrate 21 22, form the capacitance electrode 41 of relative first grounding electrode 31, to constitute capacitor C1.The lead-in wire electrode that stretches out from capacitance electrode 41 links to each other with outer electrode T4.Although in this example, capacitor C1 is in the inner formation of multilayer conglomerate, and it also can externally form, and is for example forming on the upper surface of top dielectric substrate 29 or on the circuit board of installation composite switch circuit.
Stacked dielectric substrate 23 and 24 has the electrode that forms transmission line on dielectric substrate 22.Form transmission line L1 at the helix electrode 11 on the dielectric substrate 23 by the helix electrode 12 that through hole electrode 51 is connected on dielectric substrate 24.Article two, the lead-in wire electrode stretches out from helix electrode 11 and 12 respectively and is connected to outer electrode T3 and T6.Form transmission line L2 at the helix electrode 13 on the dielectric substrate 23 by the helix electrode 14 that through hole 52 is connected on the dielectric substrate 24.Article two, the lead-in wire electrode stretches out from helix electrode 13 and 14 respectively and is connected to outer electrode T5 and T1.
On dielectric substrate 25 upper surfaces that are laminated on the dielectric substrate 24, form second grounding electrode 32.Three lead-in wire electrodes stretch out from second grounding electrode 32 and are connected respectively to outer electrode T2, T7 and T8.
On the upper surface of dielectric substrate 28, form helix electrode 15, constitute the transmission line L3 of low-pass filter circuit.One end of helix electrode is connected to outer electrode T3, and the other end is connected to capacitance electrode 44 and 43 by through hole 54 and 53.
On the upper surface of top dielectric substrate 29, form pattern electrode (pattern electrode) 16 and 17.Pattern electrode 16 is connected to through hole 54 on the dielectric substrate 28 by through hole 55.Pattern electrode 17 usefulness markings (marker) on the upper surface of top dielectric substrate 29, further form and are connected to outer electrode T1, T4, T5 and 76 pattern electrode.
Composite switch device with said structure approximately is 8 dielectric material manufacturing with dielectric constant.Dielectric material is made stratiform (dielectric substrate) with scraper, and the electric conducting material by screen printing such as Ag, forms each pattern electrode on dielectric substrate.There are these dielectric substrates of pattern electrode of printing stacked thereon, press with baking (fire) and become a multilayer conglomerate.After baking, outer electrode T1 forms at the side and the end face of multilayer conglomerate to T8 and pattern electrode.At last, the semiconductor device 1 that comprises the first and second diode D1 and D2, be installed in the end face of multilayer conglomerate, make the first diode D1 be connected to pattern electrode 16 and outer electrode T5, and the second diode D2 is connected to outer electrode T1 and T4, to obtain size is that length/width is 4.5mm/3.2mm, the composite switch device of the present invention of thick 2mm.
In the composite switch device that obtains like this, by capacitor C2, the low-pass filter circuit that C3 and C4 and transmission line L3 form inserts between first end of the anode tap of the first diode D1 and the transmission line L1 that shunt connects.
Obtaining of the wireless transceiver circuit of Fig. 3 is to connect radiating circuit Tx to outer electrode T3 by capacitor C11, connect antenna ANT to outer electrode T5 by capacitor C13, connect receiving circuit Rx to outer electrode T1 by capacitor C12, connect first control circuit CONT1 to outer electrode T6 by resistance R 1, connect capacitor C 14 and form path over the ground, connect second control circuit CONT2 to outer electrode T4 by resistance R 2 to outer electrode T6.
The above-mentioned composite switch circuit that obtains, until the insertion loss of 5.5GHz frequency through measuring as shown in Figure 6A.0.5 of Fig. 6 A arrives the enlarged image of 1.5GHz passband shown in Fig. 6 B.Can find out better that from Fig. 6 B composite switch device demonstrates insertion loss low as 1dB or still less in the frequency range of 900 ± 250MHz.Thereby the composite switch circuit of the preferred embodiments of the present invention is being outstanding aspect the minimizing insertion loss.In addition, because physical dimension can reduce, only need a little block space when composite switch device of the present invention is installed on circuit board, thereby reduced size such as the wireless transceiver of cellular radio.The suitable frequency range of composite switch device of the present invention is about 800MHz to several gigahertzs.
In the above-described embodiment, the first and second transmission line L1 and L2 are arranged between first grounding electrode 31 and second grounding electrode 32, and the major part of commutation circuit is than the partly more close installation surface of low-pass filter circuit.Under this structure, second grounding electrode 32 and the relative capacitance electrode 42 and the capacitor C 2 and the C3 of 43 formation ground connection, second grounding electrode 32 has lead portion, just, outer electrode T2 in the foregoing description is to be connected to the ground termination points that the composite switch device circuit board is installed.The use of outer electrode T2 is as line electrode, can regard inductance L 4 and L5 as, shown in the equivalent electric circuit of Fig. 7, is connected in series with capacitor C 2 and C3.In this equivalent electric circuit,, can reduce harmonic wave effectively by between capacitor C 2 and the inductance L 4 and all the shaking of connecting between capacitor C 3 and inductance L 5.
Thereby in the present invention, best first and second transmission line L1 and L2 are arranged between two grounding electrodes, and the electric capacity of low-pass filter circuit forms by the grounding electrode on transmission line L1 and the L2 with respect to this grounding electrode and the capacitance electrode on it.Under such structure, can obtain having high performance miniaturization composite switch circuit.
In the above-described embodiments, transmission line L1 and L2 are formed by the helix electrode that is printed on the adjacent two layers dielectric substrate continuously.By making the line electrode spiral and at two layer medium substrate top overlapping line electrode, the length of line electrode becomes shorter.
Fig. 8 is the perspective view that the corresponding basic unit of the multilayer conglomerate that constitutes another composite switch circuit 90 of the present invention is shown.The equivalent electric circuit that comprises composite switch circuit 90 as shown in Figure 9.The equivalent electric circuit of Fig. 9 is similar to the equivalent electric circuit of Fig. 2, but wherein additional capacitor C5 be connected in low-pass filter circuit and the first transmission line L1 that connects along separate routes between form over the ground divided channel.Capacitor C5 is by forming at first grounding electrode 31 and the capacitance electrode on dielectric substrate 22 45 on the dielectric substrate 21, and capacitance electrode 45 is connected to outer electrode T3.Because Fig. 8 is the same with dielectric substrate 23 to 29 Fig. 2 respectively from the 3rd to the 9th layer following substrate layer, these substrate layers be described in this with Fig. 8 in omit.
The composite switch device that comprises the combinations thereof commutation circuit is with aforesaid the same manner production, and has been proved with the foregoing description same performance is arranged.
In the position of capacitor C 5, additional capacitor C6 can connect as shown in figure 10.By embedding capacitor C shown in Figure 95 or capacitor C shown in Figure 10 6, the line length of the first transmission line L1 that can shorten effectively.
As mentioned above, according to the present invention, can obtain a little embedding low-pass filter circuit, have a high performance composite switch circuit.In addition, by arrangement combinations commutation circuit on a series of dielectric substrates, can obtain having the miniaturization composite switch device that comprises composite switch circuit of multilayer conglomerate form.Composite switch circuit of the present invention and composite switch device show enough performances in wide frequency range, and the insertion loss is very little and the harmonic wave inhibition is effective.
Though the present invention is described with reference to realizing alternately connecting the composite switch circuit of radiating circuit to antenna and receiving circuit to antenna, is appreciated that the switchable circuit of composite switch circuit of the present invention and not only is confined to above circuit.
Claims (11)
1. one kind is used for alternately being electrically connected first circuit to tertiary circuit or be electrically connected the composite switch circuit of second circuit to tertiary circuit, comprising:
First path of described first circuit and described tertiary circuit interconnects, this first path comprises first diode and first transmission line, first end of this first diode is connected to described tertiary circuit, and first end of described first transmission line is connected on the node between second end of described first circuit and described first diode along separate routes;
The alternate path of described second circuit and described tertiary circuit interconnects, this alternate path comprises second transmission line and diode, first end of this second transmission line is connected to described tertiary circuit, first end of described second diode is connected on second end and the node between the described second circuit of described second transmission line along separate routes, it is characterized in that described composite switch circuit also comprises:
Be arranged on the low-pass filter circuit in described first path, with second end of described first diode that interconnects and first end of first transmission line that is connected along separate routes.
2. composite switch circuit as claimed in claim 1, wherein said first circuit is a radiating circuit, and described second circuit is a receiving circuit, and described tertiary circuit is an antenna.
3. composite switch circuit as claimed in claim 2, the negative electrode of wherein said first diode is connected in described radiating circuit, the anode of described first diode is connected in described antenna, the negative electrode of described second diode is connected in described receiving circuit, the plus earth of described second diode, described low-pass filter circuit are connected between first transmission line that the described negative electrode of described first diode and described shunt connect.
4. composite switch circuit as claimed in claim 2, the anode of wherein said first diode is connected in described radiating circuit, the negative electrode of described first diode is connected in described antenna, the anode of described second diode is connected in described receiving circuit, the minus earth of described second diode, described low-pass filter circuit are connected between first transmission line that the described anode of described first diode and described shunt connect.
5. composite switch device that comprises composite switch circuit, composite switch circuit is arranged on a series of dielectric substrates of multilayer conglomerate, described composite switch circuit can realize alternately being electrically connected first circuit to tertiary circuit or be electrically connected second circuit to tertiary circuit, and comprises:
First path of described first circuit and described tertiary circuit interconnects, this first path comprises first diode and first transmission line, first end of this first diode is connected to described tertiary circuit, and first end of described first transmission line is connected on the node between second end of described first circuit and described first diode along separate routes;
The alternate path of described second circuit and described tertiary circuit interconnects, described alternate path comprises second transmission line and second diode, first end of described second transmission line is connected to described tertiary circuit, first end of described second diode is connected on second end and the node between the described second circuit of described second transmission line along separate routes, it is characterized in that described composite switch device also comprises:
Be arranged on the low-pass filter circuit in described first path, first end of first transmission line that is connected with second end and the shunt of described first diode that interconnects and
At least described first transmission line, second transmission line and a part of described low-pass filter circuit are arranged at least one interior internal layer dielectric substrate of described multilayer conglomerate.
6. composite switch device as claimed in claim 5, wherein said first diode and described second diode are arranged on the end face of described multilayer conglomerate.
7. as the composite switch device of claim 5 or 6, wherein be arranged between two at least two grounding electrodes of on-chip described first and second transmission lines of interior media on being arranged in other dielectric substrate of branch of described multilayer conglomerate, and the electric capacity of wherein said low-pass filter circuit is by the last grounding electrode in described two electrodes of described first and second transmission lines of clamping be arranged in respect to the described electrode of going up on grounding electrode and the dielectric substrate in the above and form.
8. composite switch device as claimed in claim 7, the electrode that wherein forms the capacitor plate of described low-pass filter circuit are arranged in mounting plane with respect to described composite switch device and are positioned on the dielectric substrate of upper surface of described first and second transmission lines.
9. as the composite switch device of claim 5 or 6, wherein said first and second transmission lines are formed by spiral electrode pattern.
10. as the composite switch device of claim 5 or 6, the negative electrode of wherein said first diode is connected to described first circuit, the anode of described first diode is connected to described tertiary circuit, the negative electrode of described second diode is connected to described second circuit, the plus earth of described second diode, and described low-pass filter circuit is connected between first transmission line that the negative electrode of described first diode and described shunt connect.
11. composite switch device as claim 5 or 6, the anode of wherein said first diode is connected to described first circuit, the negative electrode of described first diode is connected to described tertiary circuit, the anode of described second diode is connected to described second circuit, the minus earth of described second diode, and described low-pass filter circuit is connected between first transmission line that the anode of described first diode and described shunt connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981163262A CN1160856C (en) | 1998-07-20 | 1998-07-20 | Composite switch circuit and composite switch device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981163262A CN1160856C (en) | 1998-07-20 | 1998-07-20 | Composite switch circuit and composite switch device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410044632 Division CN1545215B (en) | 1998-07-06 | 1998-07-20 | Composite switching circuit and composite switching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1242648A CN1242648A (en) | 2000-01-26 |
| CN1160856C true CN1160856C (en) | 2004-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981163262A Expired - Lifetime CN1160856C (en) | 1998-07-20 | 1998-07-20 | Composite switch circuit and composite switch device |
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| Country | Link |
|---|---|
| CN (1) | CN1160856C (en) |
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1998
- 1998-07-20 CN CNB981163262A patent/CN1160856C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1242648A (en) | 2000-01-26 |
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